API

API Overview

The calling sequence is open>query_status>begin>write>end>close. Please notice that:

• write method is used for printing content.
• print content should be between begin method and end method.
• query_status should be between open method and close method, but should not be between begin method and end method

open

int printer_open()

Open the printer device.This operation should be used before other operations.

Returns
int	The result code, >= 0, success; <0 error code.

begin

int printer_begin()

Prepare to print, the app should print data after this funciton.

Returns
int	The result code, >= 0, success; <0 error code.

end

int printer_end()

End to print,the begin and end apis are pair operations.

Returns
int	The result code, >= 0, success; <0 error code.

close

int printer_close()

Close the device.The open and close apis are pair operations. If you don’t want to use the device, you should call close to release the device.

Returns
int	The result code, >= 0, success; <0 error code.

query_status

int printer_query_status()

Query the status of the printer.This api should be used inner open and close, but not inner begin and end.

Returns
int	The result code, == 1, has paper; == 0, success; <0 error code.

write

int printer_write(unsigned char* pData, int nDataLength)

Write data to the device. The data can be String, Bitmap data or ESC Commands.

Parameters
pData	unsigned char*: data or ESC command
nDataLength	int:Length of data

Returns
int	The result code, >= 0, success; <0 error code.