API: Difference between revisions

Revision as of 08:18, 4 April 2018

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

 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.

 int printer_begin()

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

Parameters

Returns

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

 int printer_end()

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

Parameters

Returns

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

 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.

 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.

 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.

@@ Line 70: / Line 70: @@
 ===== read =====
 ===== 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();