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import barcode from barcode.writer import ImageWriter import win32print import win32ui from PIL import Image, ImageWin print("Using default printer: " + win32print.GetDefaultPrinter()) def print_barcode(number): EAN = barcode.get_barcode_class('code128') with open("./lastbarcode.jpg", "wb") as f: try: EAN(number, writer=ImageWriter()).write(f) except Exception as e: print(str(e)) quit() # # Constants for GetDeviceCaps # # # HORZRES / VERTRES = printable area # HORZRES = 28313 VERTRES = 28313 # # LOGPIXELS = dots per inch # LOGPIXELSX = 80 LOGPIXELSY = 80 # # PHYSICALWIDTH/HEIGHT = total area # PHYSICALWIDTH = 0 PHYSICALHEIGHT = 0 # # PHYSICALOFFSETX/Y = left / top margin # PHYSICALOFFSETX = 0 PHYSICALOFFSETY = -100 printer_name = win32print.GetDefaultPrinter () file_name = "lastbarcode.jpg" # # You can only write a Device-independent bitmap # directly to a Windows device context; therefore # we need (for ease) to use the Python Imaging # Library to manipulate the image. # # Create a device context from a named printer # and assess the printable size of the paper. # hDC = win32ui.CreateDC () hDC.CreatePrinterDC (printer_name) printable_area = hDC.GetDeviceCaps (HORZRES), hDC.GetDeviceCaps (VERTRES) printer_size = hDC.GetDeviceCaps (PHYSICALWIDTH), hDC.GetDeviceCaps (PHYSICALHEIGHT) printer_margins = hDC.GetDeviceCaps (PHYSICALOFFSETX), hDC.GetDeviceCaps (PHYSICALOFFSETY) # # Open the image, rotate it if it's wider than # it is high, and work out how much to multiply # each pixel by to get it as big as possible on # the page without distorting. # bmp = Image.open (file_name) bmp = bmp.rotate (90) ratios = [1.0 * printable_area[0] / bmp.size[0], 1.0 * printable_area[1] / bmp.size[1]] scale = min (ratios) scale = 0.5 # # Start the print job, and draw the bitmap to # the printer device at the scaled size. # hDC.StartDoc (file_name) hDC.StartPage () dib = ImageWin.Dib (bmp) scaled_width, scaled_height = [int (scale * i) for i in bmp.size] x1 = int ((printer_size[0] - scaled_width) / 2) y1 = int ((printer_size[1] - scaled_height) / 2) x2 = x1 + scaled_width y2 = y1 + scaled_height x1 = 200 y1 = 50 dib.draw (hDC.GetHandleOutput (), (x1, y1, x2, y2)) hDC.EndPage () hDC.EndDoc () hDC.DeleteDC () while True: user_input_num = input("Product ID: ") if user_input_num != "": print_barcode(user_input_num.upper())