Added 3of9 Barcode feature

README.md

@@ -4,7 +4,7 @@ This piece of code allows you to control a datamax-o'neil label printer. You do
 programming language for simple tasks, this module takes care of it.
 
 The module was developed and tested on python 3.6 using a datamax o'neil e-class mark III printer. It still has very
-limited functionality allowing you to print text labels and QR-codes. In case you need any other features feel free to
+limited functionality allowing you to print text labels,QR-codes and Barcodes. In case you need any other features feel free to
 contribute.
 
 ## Install
@@ -29,6 +29,7 @@ printer.configure()
 printer.start_document()
 printer.set_qr_code(285, 120, 'https://www.innetag.ch/', 9)
 printer.set_label(300, 60, 'innetag.ch', 9, 10)
+printer.set_barcode('0266','0025','1039001234',1)
 printer.print()
 ```
 

datamax_printer/datamax_printer.py

@@ -122,6 +122,30 @@ def set_qr_code(self, x_pos, y_pos, data, size=8):
 
         command = f'1W1d{size}{size}000{y_pos}{x_pos}{data}\x0D\x0D'
         return self.__send_to_printer(command)
+
+    def set_barcode(self, x_pos, y_pos, data, additional_info, size='000'):
+        """
+        Generates a 3of9 Barcode with a 3:1 ratio
+        :param additional_info: 1 to add number to bottom of barcode, 0 to have no number
+        :param x_pos: Position of the barCode on the X-Axis, must be 4 digits eg 0010 (in 0.1mm)
+        :param y_pos: Position of the barCode on the Y-Axis, must be 4 digits eg 0010 (in 0.1mm)
+        :param size: height of barcode(in 0.1mm) enter 000 for default (.010mm)
+        :param data: Data to be encoded in the barcode.
+        (Numeric Data, Alphanumeric Data, - . * $ / + % and the space character.)
+        :return: Number of bytes sent to the printer
+        """
+        if self.command_mode:
+            raise RuntimeError('Cannot print Barcode in command mode')
+
+        if additional_info== 0:
+            additional_info = "a"
+        elif additional_info == 1:
+            additional_info = "A"
+        else:
+            raise RuntimeError('parameter "additional_info" must either be 0 or 1')
+        command = f'1{additional_info}42{size}{y_pos}{x_pos}{data}\x0D\x0D'
+        return self.__send_to_printer(command)
+
 
     def print(self):
         self.__send_to_printer('E')