CN107256134A - It is virtually method and apparatus, the POS terminal of computer printer by POS terminal - Google Patents

Abstract

The invention relates to a method and device for virtualizing a POS terminal as a computer printer and a POS terminal. The method includes receiving a printing instruction through a first printing driver, and obtaining first data to be printed according to the printing instruction, and the first printing driver is used to provide a printer type as a POS terminal printer; calling through the first printing driver The print server program converts the first data to be printed into the second data to be printed according to the POS terminal; and sends the second data to be printed to the printer of the POS terminal, so that the printer of the POS terminal can 2. Print the data to be printed. Improved utilization of POS printers.

Description

Method and device for virtualizing POS terminal as computer printer, POS terminal

technical field

The invention relates to the field of computer applications, in particular to a method and device for virtualizing a POS terminal as a computer printer, and a POS terminal.

Background technique

At present, POS has been widely used in various payment occasions and has become one of the mainstream electronic payment channels.

At present, the function of the POS terminal printer is only to print out the required consumption vouchers after the transaction. For the printer, the equipment is vacant. It is far from the print volume allowed in the printer equipment life specification, and the usage rate is low.

Contents of the invention

Based on this, it is necessary to address the problem of low utilization rate of POS printers, and provide a method and device for virtualizing POS devices as computer printers, and a POS terminal, which can increase the utilization rate of POS devices.

A method for virtualizing a POS terminal as a computer printer, comprising the following steps:

Receiving a print instruction through a first print driver, and obtaining first data to be printed according to the print instruction, the first print driver being used to provide a printer type that is a POS terminal printer;

calling a print server program through the first print driver to convert the first data to be printed into second data to be printed conforming to the POS terminal;

Sending the second data to be printed to a printer of the POS terminal, so that the printer of the POS terminal prints the second data to be printed.

In one embodiment, the method also includes:

storing the obtained first data to be printed in a specified file directory path;

The first print driver invokes a print server program to read the first data to be printed from the specified file directory path, and convert the first data to be printed into second data to be printed conforming to the POS terminal.

In one of the embodiments, converting the first to-be-printed data into the second to-be-printed data conforming to the POS terminal by calling the print server program through the first print driver includes:

Convert the first data to be printed into monochrome bitmap data by calling the print servo program through the first print driver, and convert the monochrome bitmap data into dot matrix data, the dot matrix data is the The second data to be printed conforms to the POS terminal.

In one of the embodiments, the step of sending the second data to be printed to the printer of the POS terminal includes:

Sending the second data to be printed to the printing agent program of the POS terminal, and transmitting the second data to be printed to the printer of the POS terminal through the printing agent program.

A method of virtualizing a POS terminal as a computer printer, comprising:

Receive the second data to be printed according to the POS terminal sent by the printing agent program of the POS terminal, and send the second data to be printed to the printer of the POS terminal; wherein, the second data to be printed obtained by converting the first data to be printed acquired by the first print driver for the print servo program;

Printing the second data to be printed by the printer of the POS terminal.

In one of the embodiments, the step of receiving the data to be printed conforming to the POS terminal sent by the print server program through the print agent program of the POS terminal includes:

The dot matrix array data sent by the print server program is received by the print agent program of the POS terminal, and the dot matrix array data is converted into a monochrome bitmap by the print server program to convert the first data to be printed acquired by the first print driver After the data, the monochrome bitmap data is converted to the obtained one.

A device for virtualizing a POS terminal as a computer printer, comprising:

A print driver module, configured to provide a printer whose type is a POS terminal printer, receive a print instruction, and obtain the first data to be printed according to the print instruction;

The print server program module is used to convert the first data to be printed into the second data to be printed in accordance with the POS terminal, and send the second data to be printed to the printer of the POS terminal, so that the printer of the POS terminal Print the second data to be printed.

In one of the embodiments, the print driver module is further configured to store the obtained first data to be printed in a specified file directory path, and call the print server program module to read the obtained data from the specified file directory path. The first data to be printed is converted into the second data to be printed according to the POS terminal.

In one of the embodiments, the print driver module is also used to call the print server program module to convert the first data to be printed into monochrome bitmap data, and convert the monochrome bitmap data into dot matrix Array data, the dot matrix array data is the second data to be printed conforming to the POS terminal.

In one of the embodiments, the print server program module is also used to send the second data to be printed to the print agent program of the POS terminal, and transmit the second data to be printed to the A printer for the POS terminal.

A POS terminal, comprising:

The print agent program module is used to receive the second data to be printed according to the POS terminal sent by the print server program, and send the second data to be printed to the printer of the POS terminal; wherein, the second data to be printed obtained by converting the first data to be printed acquired by the first print driver for the print servo program;

A printing module, configured to print the second data to be printed.

In one of the embodiments, the print agent program is also used to receive the dot array data sent by the print server program, and the dot array data is the first waiting data obtained by the first print driver by the print server program. After the print data is converted into monochrome bitmap data, the monochrome bitmap data is then converted.

The above-mentioned method and device for virtualizing a POS terminal as a printer, and the POS terminal obtain the first data to be printed through the first print driver, and call the print server program to convert the first data to be printed into the second data to be printed in accordance with the POS terminal. The second data to be printed is sent to the printer of the POS terminal for printing, which improves the utilization rate of the POS printer.

Description of drawings

Fig. 1 is a schematic diagram of an application scenario of a method for virtualizing a POS terminal into a computer printer in one embodiment;

Fig. 2 is a flow chart of the method for virtualizing the POS terminal as a computer printer in one embodiment;

Fig. 3 is the printing flowchart of Windows operating system in an embodiment;

Fig. 4A is a working flow diagram of the print port monitor in one embodiment;

Fig. 4B is a schematic diagram of a graphic example in an embodiment;

Fig. 5 is the POS terminal flowchart of the method for virtualizing the POS terminal as a computer printer in one embodiment;

Fig. 6 is a working flow diagram of computer 110 transmitting print data to POS terminal 120 in one embodiment;

Fig. 7 is a structural block diagram of a virtual POS terminal being a Windows printer device in one embodiment;

Fig. 8 is a structural block diagram of a device for virtualizing a POS terminal as a computer printer in one embodiment;

Fig. 9 is a workflow diagram of virtualizing the POS terminal as a computer printer device in one embodiment.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Fig. 1 is a schematic diagram of an application scenario of a method for virtualizing a POS terminal as a computer printer in an embodiment. As shown in FIG. 1 , the application scenario includes a computer 110 and a POS terminal 120 . The computer 110 and the POS terminal 120 can perform data communication through wired or wireless communication. Windows operating system, Linux operating system, etc. can be installed on the computer 110 . The wired way can be serial port, USB cable, Ethernet and other connection communication. The wireless communication method may be WIFI or the like. The computer 110 may receive a print instruction through a first print driver, and obtain the first data to be printed according to the print instruction. The first print driver is used to provide a printer type that is a POS terminal printer, and the print is invoked through the first print driver. The servo program converts the first data to be printed into the second data to be printed conforming to the POS terminal, and sends the second data to be printed to the printer of the POS terminal, so that the printer of the POS terminal 120 can 2. Print the data to be printed.

Fig. 2 is a flowchart of a method for virtualizing a POS terminal as a computer printer in one embodiment. As shown in FIG. 2 , a method for virtualizing a POS terminal as a computer printer is described from a computer perspective, including steps 202 to 206 . in:

In step 202, a printing instruction is received by a first printing driver, and first data to be printed is acquired according to the printing instruction, and the first printing driver is used to provide a printer type as a POS terminal printer.

Specifically, the computer may receive a printing instruction triggered by a user through the installed first printing driver, and obtain the first data to be printed according to the printing instruction. The first data to be printed may be in word format, PDF format data, picture format data, TXT format data, etc.

In step 204, the first print driver invokes a print server program to convert the first data to be printed into second data to be printed conforming to the POS terminal.

Specifically, the print server program refers to an application program used to convert data to be printed in the computer into data to be printed conforming to the POS terminal. The first print driver invokes the print server program through a function.

Step 206, sending the second data to be printed to a printer of the POS terminal, so that the printer of the POS terminal prints the second data to be printed.

Specifically, the print server program of the computer sends the second data to be printed to the printer of the POS terminal through an agreed protocol for printing. The agreed protocol refers to a protocol that complies with the data communication between the computer and the POS terminal.

In the above method of virtualizing the POS terminal as a printer, the first print driver is used to obtain the first data to be printed, and the print server program is called to convert the first data to be printed into the second data to be printed that conforms to the POS terminal, and the second data to be printed is Send to the printer of the POS terminal for printing, which improves the utilization rate of the POS printer.

In one embodiment, the method for virtualizing a POS terminal as a computer printer further includes: storing the obtained first data to be printed in a specified file directory path.

Specifically, before invoking the first print driver, the user needs to configure system-related parameters and specify a file directory path for storing the first data to be printed. For example, in a Windows system, the user can set the path as: HKEY_CURRENT_USER\SOFTWARE\ImagePrinter, which is used to store the first data to be printed. In addition, the configuration of system-related parameters can also be automatically completed by installing the first print driver. For the parameters related to the configuration system, please refer to Table 1.

Table 1

In one embodiment, the method for virtualizing a POS terminal as a computer printer further includes: calling a print server program through the first print driver to read the first data to be printed from the specified file directory path, and The first data to be printed is converted into the second data to be printed conforming to the POS terminal.

Specifically, the first print driver obtains the print instruction, and then converts the first data to be printed into bitmap data and stores it under the specified file directory path. Subsequently, the first print driver calls the print server program to obtain the bitmap data in the specified file directory path, and converts the first data to be printed into the second data to be printed conforming to the POS terminal.

Fig. 3 is a printing flow chart of the Windows operating system in an embodiment. The Windows print driver is developed based on the open source (GNU License) ImagePrinter, which belongs to the category of virtual printer drivers on the Windows platform. port monitor, and provides port driver implementations. The port driver is the first print driver. As shown in Figure 3, the printing process of the windows operating system includes:

Step 302, start the printing application program.

Specifically, the printing application program creates a device context and draws an object on it, and then calls the corresponding function interface in GDI (Graphics Device Interface) to send a print request to the printer corresponding to the device context. Creating a device context means configuring a device operating environment. GDI is the graphics device interface provided by Windows. It is a core component of the Windows system and the heart of the Windows graphics function. Its main function is to be responsible for the information exchange between the Windows system and the drawing program. All graphics and image processing, font processing, and color management functions are implemented in GDI.

Step 304, create a device context.

Specifically, the GDI function calls the corresponding printer driver to process the printing request.

Step 306, the graphic device interface GDI invokes the corresponding printer driver.

Specifically, the print driver creates a print job, and calls the GDI function to return the processing result to GDI through the print interface DLL (the DLL is an interface file) and the print graphics DLL.

Step 308, the GDI function calls the printing spooling system.

Among them, the printing spooling technology of the Windows operating system mainly refers to the time taken by the host processor in order to reduce the time occupied by the host processor (because the speed of the port is usually much lower than the speed of the processor) when the host processor transmits data to the external device. A technology that uses the auxiliary storage (usually a hard disk) as the buffer memory of the port, and the specific sending work is handled by the background.

The steps described above develop the Windows native process for the printer driver. That is, if the printer driver is developed on the Windows platform, the above steps need to be implemented.

Step 310, the printing spooling system calls the language monitor. The language monitor is mainly used to support the two-way communication of the printer, monitor the status of the printer, and obtain and process some events.

Specifically, Print Offline calls the print request handler to send the print job to the printer specified by the application. The print request processor then sends the print job to the local print provider, which stores the print job on disk as a raw spool file if the print job is of type indirect The print fragments are continuously appended to the spool file until the application terminates a print job by calling the EndDoc function. The above steps 302 to 310 can be repeated multiple times to generate a complete spool file. Next, the local print provider starts a background thread, and the main print thread selects an optimal time to trigger the parsing process of the spool file according to the monitoring situation of the print spool subsystem resources. At this point, the main printing thread will call the StartDocPort function to start a thread in the printing processor to start parsing. The printer processor thread calls ReadPrinter to activate a local print provider to read the generated print spool file from disk. At the same time, the print processor also calls the WritePrinter function to activate the language monitor of the printer job so that the data can be sent to the corresponding printer through the physical port.

Step 312, the language monitor calls the port monitor.

Specifically, the print language monitor calls the function of the port monitor to send data to the printer. Port monitors control communications between printers and physical ports. Its function is to transmit data to or receive data from the port device (some port monitors only have the function of transmitting). Generally, the operating system will provide port monitors to support some types of ports (LPT, COMN, etc.) for printers, and developers do not need to provide their own port monitors. But if the port type of the printer is not in the list of port types supported by the operating system by default, the developer needs to write his own print port monitor and install it with the printer driver. Among them, the role of ImagePrinter in the printing process is a port monitor, while providing the realization of the port driver.

FIG. 4A is a flow chart of the print port monitor in FIG. 3 . In the implementation of the port monitor, the function of writing bitmap data to a specific file directory path is realized by configuring WriteFile. As shown in Figure 4A, the workflow of the print port monitor includes:

Step 404, open the printing port.

Specifically, the print spooler 402 first calls the OpenPort function of the port monitor. The main function of this function is to open a port and return a handle identifying the port. In subsequent calls to the spool, this handle will be used as an input parameter to other processing functions. The handle is the basis of the entire Windows programming. A handle refers to a unique integer value used, that is, a 4-byte (8-byte in 64-bit program) long value, to identify different objects in the application and different instances of the same class, such as a Windows, buttons, icons, scroll bars, output devices, controls or files, etc.

Step 406, start printing job.

Specifically, after a port is opened, the print spooler then calls the StartDocPort function to start a print job. The StartPort function mainly establishes a data link with the kernel port driver by calling the CreateFile function provided by the Windows API (Application Programming Interface).

Step 408, judging whether to read or write data to the printer.

Specifically, when the data link is established, the print spool can perform two-way operations as required. One is to write data to the printer. In this case, the print spool first calls the WritePort function of the port monitor and then calls Windows multiple times. The WriteFile function provided by the API is used to send data to the kernel port driver. In the first print driver, by configuring the write port 410 and calling the WriteFile function, the bitmap data is written to the specified file path directory. The other is to read data to the printer. At this time, the print spooler first calls the ReadPort function of the port monitor and then calls the ReadFile function provided by the Windows API to read hardware information from the kernel port driver.

Step 412, transmit data.

Specifically, after writing data to the printer, the print spooler calls the GetPrinterDataFromPort function. The main function of this function is to finally realize the data transmission between the print driver and the kernel port driver by calling the DeviceloControl function provided by the Windows API.

Step 414, complete the printing process.

Specifically, after the above operations are completed, the print spooler calls the EndDocPort function to end a print job. The main function of this function is to release the data link established by the CreateFile function and all system resources requested by the StartDocPort function.

Step 416, judging whether there are still jobs to be printed in the print queue.

Specifically, after a print job is completed according to the above process, the print spooler checks whether there are other files to be printed in the print queue connected to this port. If there is, the program returns to the StartDocPort function to repeat the above process, if not, the print spooler closes the port.

Step 418, close the port.

Specifically, the ClosePort function of the port monitor is used to close the port. The main function of this function is to apply all system resources in the OpenPort function.

In one embodiment, the converting the first data to be printed into the second data to be printed conforming to the POS terminal by calling the print server program through the first print driver includes: calling the print server program by the first print driver The program converts the first data to be printed into monochrome bitmap data, and converts the monochrome bitmap data into dot matrix array data, and the dot matrix array data is the second data to be printed conforming to the POS terminal .

Specifically, after calling the print server program through the first print driver, the print server program will obtain the first data to be printed under the specified file directory path. At the same time, it is judged whether the first data to be printed is monochrome bitmap data, if the first data to be printed is non-monochrome bitmap data, first convert the bitmap data into monochrome bitmap data, and then convert the monochrome bitmap data converted into dot matrix array data, the dot matrix array data is the second data to be printed conforming to the POS terminal. Wherein, the dot matrix array data includes the first character, the byte number of each row of graphics and graphics data. in:

The first character [1Byte] is used to indicate the number of lines of the graph.

The number of bytes of the first line of graphics [2Byte, high byte first], the graphics data of the first line of graphics [the width of one line is 384 points].

The byte count of the second line of graphics [2Byte, high byte first]. And so on. Third row, fourth row, etc.

Among them, 1 means that there is data (black dot) at this position, and 0 means that there is no data (white dot) at this position, for example:

As shown in Figure 4B, the pixel of the graphic is 98*44 pixels

The converted array is:

The first byte 0x2C of the dot matrix array means that the number of rows (that is, the height) of the image is 44. That is, 0X2C is hexadecimal, converted to decimal is 44, that is, 44 lines. and so on.

In one embodiment, the step of sending the second data to be printed to the printer of the POS terminal includes: sending the second data to be printed to the print agent program of the POS terminal, and through the print agent program and transmitting the second data to be printed to a printer of the POS terminal.

Specifically, after the print servo program converts the monochrome bitmap data into dot matrix data, the data is sent to the POS terminal through an agreed communication protocol. It is agreed that the communication protocol adopts the LRC (Longitudinal Redundancy Check) verification mechanism. After the dot array data is transmitted from the servo program to the print agent program of the POS terminal, LRC verification will be performed first to ensure the accuracy and integrity of the dot array data. If the dot array data is wrong, the print agent program of the POS terminal will An error code will be returned to the print server program; the print server program will resend the dot matrix array data to the print agent program of the POS terminal; finally the print agent program will transmit the correct and complete data to the printer of the POS terminal to complete the printing task. Wherein, the agreed communication protocol includes data header, data length, data content, LRC verification, response packet, response packet data header, response packet data content, LRC verification, and the like. Specifically, when sending array data, send the data header first, and then send the data content. Please refer to Table 2 for the definition of the data header format.

Table 2

Wherein, the start character represents the start flag of the data, and the data header information includes: the length of the data packet, the device type information, the type of the data packet, and the index information of the command, which are used for the initialization of the transmitted data. Among them, please refer to Table 3 for the definition of the data content format.

table 3

The data packet length is the length of the entire data except the start character. When receiving, the receiving end first receives the data packet length, and then receives the remaining data. The data packet type and command index contain information such as parsing format, calculation format, real data content, and data root format. LRC is the data check, which is the XOR value of other data except the start character, which ensures the accuracy of the data. The specific format of the data content is as follows. If the parameter is an integer, it will be expressed in 4 bytes (high bit first). Please refer to Table 4.

Table 4

parameter 1 parameter 2 parameter 2 . . . parameter n

After the data is successfully printed or the data transmission process is completed, the POS terminal will return information to the print server program. Please refer to Table 5 for the definition of the returned response packet.

table 5

The start character indicates the start flag of the data, and the data header information includes: the length of the data packet, the device type information, the type of the data packet, and the index information of the command, which is used for the initialization of the transmitted data. For the definition of the data content format, please refer to Table 6 .

Table 6

The meaning of each part of the data packet is the same as that of the data contained above, and there is an additional error code in the data content. If the error code (ErrorCode) is an LRC check error, or the response packet itself has a check error, the PC will resend the previous data packet. . The error codes are defined as follows:

In the above-mentioned step of sending the second data to be printed to the printer of the POS terminal, the communication protocol adopts the LRC verification mechanism, which ensures the integrity and correctness of the dot matrix array data, so that the POS printer can accurately print out the data required by the user. data.

Fig. 5 is a flowchart of a POS terminal method for virtualizing a POS terminal as a computer printer in another embodiment. As shown in FIG. 5 , the method for virtualizing a POS terminal as a computer printer is described from the perspective of a POS terminal, including step 502 and step 504 . in:

Step 502: Receive the second data to be printed according to the POS terminal sent by the print server program through the printing agent program of the POS terminal, and send the second data to be printed to the printer of the POS terminal; wherein, the second The to-be-printed data is obtained by converting the first to-be-printed data acquired by the first print driver by the printing servo program.

Step 504, printing the second to-be-printed data through a printer of the POS terminal.

In one embodiment, the step of receiving the data to be printed conforming to the POS terminal sent by the print server program through the print agent program of the POS terminal includes:

The dot matrix array data sent by the print server program is received by the print agent program of the POS terminal, and the dot matrix array data is converted into a monochrome bitmap by the print server program to convert the first data to be printed acquired by the first print driver After the data, the monochrome bitmap data is converted to the obtained one.

Through the above steps, the printing data is converted into data suitable for printing by the printer, and the integrity and correctness of the data are guaranteed. The POS printer is successfully virtualized as a computer printer, and the utilization rate of the POS printer is improved.

In one example, the step of sending the second data to be printed to the POS terminal printer through the print proxy program of the POS terminal includes:

After the print agent program of the POS terminal receives the data to be printed sent by the print server program and conforms to the data to be printed by the POS terminal, it verifies the second data to be printed, and then sends the correct and complete second data to be printed to the POS terminal The printer prints.

Specifically, the print agent program of the POS terminal monitors the data port. When the print agent program of the POS terminal monitors the dot array data sent by the print server program, the print agent program of the POS terminal firstly processes the dot array data, that is, the second data to be printed. The data is verified by LRC to determine whether the data of the dot matrix array is correct and complete. If it is correct, the second data to be printed is sent to the POS printer, the second data to be printed is printed, and then a printed message is sent to the computer. Return the value and complete the printing task. If the second data to be printed is incorrect or incomplete, the POS printing agent will send an error code to the computer, and the computer printing server will resend the second data to be printed to the POS printing agent until the second The data to be printed is correctly and completely transmitted to the POS printer and the printing task is completed.

The method described above from the POS terminal to virtualize the POS terminal as a computer printer transmits the second data to be printed to the POS terminal through an agreed protocol, and finally prints the data, which ensures the accuracy and integrity of the data, so that The user can print out the correct data through the POS printer.

FIG. 6 is a flow chart of the computer 110 transmitting print data to the POS terminal 120 for printing in one embodiment. As shown in FIG. 6 , a first print driver and a print server program are installed on the computer 110 . A print agent program and a printer are installed on the POS terminal 120 . Described from the perspective of a computer, the process of the computer 110 transmitting the print data to the POS terminal 120 for printing includes:

Step 602, receiving a print driver selection instruction, and acquiring a first print driver.

Specifically, the print driver selection instruction may be an instruction generated by receiving a user selecting a POS terminal printer type on a printing interface. The first print driver is acquired according to the print driver selection instruction. The first print driver may be a driver suitable for POS terminal printers.

Step 604, the first print driver transmits the first data to be printed to the specified file directory path, and searches for and invokes the print server program.

Specifically, the first print driver converts the first to-be-printed data into bitmap data, sends the bitmap data to the specified file directory path, and invokes the print server program.

Step 606, the print server program converts the first data to be printed into dot array data, and the dot array data is the second data to be printed, and sends the second data to be printed to the print proxy module at the POS end, the The printing proxy module of the printing end is a program used by the POS end to receive the computer end.

Specifically, the computer-side print server program will obtain the first data to be printed under the specified file directory path, then judge whether the bitmap data of the first data to be printed is monochrome bitmap data, and then convert the monochrome bitmap data into A dot matrix array, the dot matrix array is the second data to be printed, and then the second data to be printed is sent to the printing agent module at the POS end through an agreed protocol. Obtaining the converted data to be printed by monitoring the communication port according to the POS terminal printing agent program, and calling the POS printer; printing the data to be printed according to the POS printer.

Fig. 7 is a structural block diagram of a device for virtualizing a POS terminal as a computer printer in an embodiment. As shown in FIG. 7 , a device that virtualizes a POS terminal as a computer printer, described from a computer perspective, includes a print driver module 702 and a print server program module 704 . in:

The print driver module 702 is configured to provide a printer whose type is a POS terminal printer, receive a print instruction, and acquire first data to be printed according to the print instruction.

The print server program module 704 is used to convert the first data to be printed into the second data to be printed conforming to the POS terminal, and send the second data to be printed to the printer of the POS terminal, so that the printer of the POS terminal Print the second data to be printed.

In one embodiment, the print driver module is further configured to store the obtained first data to be printed in a specified file directory path, and call the print server program module to read the data from the specified file directory path. The first data to be printed, and converting the first data to be printed into the second data to be printed conforming to the POS terminal.

In one of the embodiments, the print driver module is also used to call the print server program module to convert the first data to be printed into monochrome bitmap data, and convert the monochrome bitmap data into dot matrix Array data, the dot matrix array data is the second data to be printed conforming to the POS terminal.

In one of the embodiments, the print server program module is also used to send the second data to be printed to the print agent program of the POS terminal, and transmit the second data to be printed to the A printer for the POS terminal.

Fig. 8 is a block diagram of the internal structure of the POS terminal in one embodiment. As shown in FIG. 8 , a POS terminal includes a printing agent program module 802 and a printing module 804 . in:

The print agent program module 802 is used to receive the second data to be printed according to the POS terminal sent by the print server program, and send the second data to be printed to the printer of the POS terminal; wherein, the second data to be printed It is obtained by converting the first data to be printed acquired by the first printing driver for the printing servo program.

The printing module 804 is used for printing the second data to be printed.

In one embodiment, the print agent program is further configured to receive the dot array data sent by the print server program, and the dot array data is the first to-be-printed data obtained by the print server program from the first print driver. After the data is converted into monochrome bitmap data, the monochrome bitmap data is converted.

Please refer to Fig. 9, Fig. 9 is a work flow diagram of a system in which the POS terminal is virtualized as a computer printer in an embodiment, and the system may include:

The print driver module 902 is used to select the print driver of the POS printer and obtain the user's print instruction, transmit the data to be printed to the specified file directory path, and search for and call the print server program.

The print servo program module 904 is used to obtain the data to be printed, and judge whether the data to be printed is monochrome bitmap data, if it is not monochrome bitmap data, after converting it into monochrome bitmap data, the monochrome bitmap The data is converted into dot matrix data, and the data is sent to the POS terminal device through the agreed protocol.

The print agent module 906 receives the data sent by the print server program module, and judges whether the data is correct and complete. If the data is wrong, it will re-request the dot matrix array data from the printing server program on the computer side, and then send the dot matrix array data to the printing module.

The printing module 908 receives the dot array data and prints out the dot array data, completes the printing task, and feeds back the printing result.

The above method of virtualizing the POS device as a printer is integrated with the printing process on the computer side, and the user can use the POS printer to print simple documents without doing extra work. And between the computer end and the POS machine can support a variety of connection methods, not limited to the traditional parallel port cable connection method, the computer end can use serial ports, USB cables, Ethernet, WiFi, etc. to connect to the POS printer to print documents, Improved utilization of POS printers.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be realized through computer programs to instruct related hardware, and the programs can be stored in a non-volatile computer-readable storage medium When the program is executed, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) and the like.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (12)

1. a kind of method that POS terminal is virtual as computer printer, it is characterized in that, may further comprise the steps: Receiving a print instruction through a first print driver, and obtaining first data to be printed according to the print instruction, the first print driver being used to provide a printer type that is a POS terminal printer; calling a print server program through the first print driver to convert the first data to be printed into second data to be printed conforming to the POS terminal; Sending the second data to be printed to a printer of the POS terminal, so that the printer of the POS terminal prints the second data to be printed. 2. The method according to claim 1, characterized in that the method further comprises: storing the obtained first data to be printed in a specified file directory path; The first print driver invokes a print server program to read the first data to be printed from the specified file directory path, and convert the first data to be printed into second data to be printed conforming to the POS terminal. 3. The method according to claim 1, wherein the converting the first data to be printed into the second data to be printed conforming to the POS terminal by calling the print server program through the first print driver comprises: Convert the first data to be printed into monochrome bitmap data by calling the print servo program through the first print driver, and convert the monochrome bitmap data into dot matrix data, the dot matrix data is the The second data to be printed conforms to the POS terminal. 4. The method according to claim 1, wherein the step of sending the second data to be printed to the printer of the POS terminal comprises: Sending the second data to be printed to the printing agent program of the POS terminal, and transmitting the second data to be printed to the printer of the POS terminal through the printing agent program. 5. A method for virtualizing a POS terminal as a computer printer, characterized in that, comprising: Receive the second data to be printed according to the POS terminal sent by the printing agent program of the POS terminal, and send the second data to be printed to the printer of the POS terminal; wherein, the second data to be printed obtained by converting the first data to be printed acquired by the first print driver for the print servo program; Printing the second data to be printed by the printer of the POS terminal. 6. The method according to claim 5, wherein the step of receiving the data to be printed conforming to the POS terminal sent by the print server program through the print agent program of the POS terminal comprises: The dot matrix array data sent by the print server program is received by the print agent program of the POS terminal, and the dot matrix array data is converted into a monochrome bitmap by the print server program to convert the first data to be printed acquired by the first print driver After the data, the monochrome bitmap data is converted to the obtained one. 7. A device for virtualizing a POS terminal as a computer printer, characterized in that it comprises: A print driver module, configured to provide a printer whose type is a POS terminal printer, receive a print instruction, and obtain the first data to be printed according to the print instruction; Printing servo program module, used to convert the first data to be printed into the second data to be printed according to the POS terminal, and send the second data to be printed to the printer of the POS terminal, so that the printer of the POS terminal Print the second data to be printed. 8. The device according to claim 7, wherein the print driver module is further configured to store the acquired first data to be printed in a specified file directory path, and call the print server program module from the The first data to be printed is read from the specified file directory path, and the first data to be printed is converted into the second data to be printed conforming to the POS terminal. 9. The device according to claim 7, wherein the print driver module is also used to call the print servo program module to convert the first data to be printed into monochrome bitmap data, and convert the monochrome bitmap data to The color bitmap data is converted into dot matrix data, and the dot matrix data is the second data to be printed conforming to the POS terminal. 10. The device according to claim 7, wherein the print server program module is further configured to send the second data to be printed to a print agent program of the POS terminal, and send the printed data to the print agent program through the print agent program. The second data to be printed is transmitted to the printer of the POS terminal. 11. A POS terminal, characterized in that it comprises: The print agent program module is used to receive the second data to be printed according to the POS terminal sent by the print server program, and send the second data to be printed to the printer of the POS terminal; wherein, the second data to be printed obtained by converting the first data to be printed acquired by the first print driver for the print servo program; A printing module, configured to print the second data to be printed. 12. The POS terminal according to claim 11, wherein the printing agent program is also used to receive the dot array data sent by the print server program, and the dot array data is the print server program that converts the obtained by converting the first data to be printed obtained by the first print driver into monochrome bitmap data, and then converting the monochrome bitmap data.