API: Difference between revisions

From wizarPOS
(Created page with "==== Functions ==== The calling sequence is open>query_status>begin>write>end>close. ===== open ===== int printer_open() Open the printer device.This operation should be us...")
 
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===== read =====
===== read =====
===== query_voltage =====
===== query_voltage =====
==== Sample ====
  The following code shows how to print some content:
  int result = PrinterInterface.open();
  if (result <0){
    return;
  }
  Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(),
                R.drawable.printer_barcode_low);
  byte[] arryBeginText = null;
  byte[] arryEndText = null;
  try {
    arryBeginText = mContext.getResources().getString(R.string.print_QR_code).getBytes("GB2312");
    arryEndText = "This is a Bitmap of Barcode".getBytes("GB2312");
  } catch (UnsupportedEncodingException e) {
    e.printStackTrace();
  }
  int result = PrinterInterface.begin();
  if (result <0){
    return;
  }
  result = PrinterInterface.write(arryBeginText, arryBeginText.length);
  if (result <0){
    return;
  }
  // print line break
  writeLineBreak(2);     
  PrinterBitmapUtil.printBitmap(bitmap, 0, 0, true);
  // print line break
  writeLineBreak(2);
  // print text
  write(arryEndText);
  // print line break
  writeLineBreak(2);
  result = PrinterInterface.end();
  if (result <0){
    return;
  }
PrinterInterface.close();

Revision as of 08:18, 4 April 2018

Functions

The calling sequence is open>query_status>begin>write>end>close.

open
 int printer_open()

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

Parameters

Returns

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

begin
 int printer_begin()

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

Parameters

Returns

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

end
 int printer_end()

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

Parameters

Returns

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.

Parameters

Returns

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.


Parameters

Returns

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 command.


Parameters

pData data or ESC command
nDataLength Length of data

Returns

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

read
query_voltage