How to print BarCode to Thermal Printer on Thermal Paper

There is dedicated ESC/POS command for Bar Code printing to Thermal Printer on Thermal Paper. Here I am showing the full code how to print Bar Code-128.

Here I’am using String variable-conId to print BarCode.

public byte[] barCodeString (String conId) {

int[] c = new int[9];

try {

int num = Integer.parseInt( conId );

for (int i = 0; i < 9; i++) {

c[i] = ((num % 10) + 48);

num = num / 10;

}

} catch (Exception e) {

System.out.Println(e);

}

return new byte[]{0x1D,0x68,0x50,0x1D, 0x6B, 73, 9, (byte)c[8], (byte)c[7], (byte)c[6], (byte)c[5], (byte)c[4], (byte)c[3], (byte)c[2], (byte)c[1], (byte)c[0]};

}

Since conId is consisting of 9 characters, ‘9’ is being used in above return byte array.

Now to print Barcode following commands should be used—

mmOutputStream.write(INIT);

mmOutputStream.write(SELECT_FONT_B);

mmOutputStream.write(SET_EMPHASIZED_MODE_ON);

mmOutputStream.write(CENTER_JUSTIFICATION);

mmOutputStream.write(barCodeString(“123456789”));