巧用win32print来控制windows系统打印机并推送打印任务

#键盘按下
def key_down(keyname):
    win32api.keybd_event(vk_code[keyname],0,0,0)

#键盘抬起
def key_up(key_name):
    win32api.keybd_event(vk_code[key_name],0,win32con.KEYEVENTF_KEYUP,0)

#按键组合操作
def simulate_three_key(firstkey,sencondkey,lastkey):
    key_down(firstkey)
    key_down(sencondkey)
    key_down(lastkey)
    key_up(lastkey)
    key_up(sencondkey)
    key_up(firstkey)
#按键组合操作
def simulate_two_key(firstkey,sencondkey):
    key_down(firstkey)
    key_down(sencondkey)
    key_up(sencondkey)
    key_up(firstkey)

for it in win32print.EnumPrinters(6):
    print(it[1])

hPrinter = win32print.OpenPrinter (printerName)
dic = hex(win32print.GetPrinter(hPrinter,2)[‘Status‘])
if dic[-2]=="8":
    print("The printer is offline.")
if dic[-5]=="4":
   print("The printer is out of toner.")
elif dic[-5]=="2":
   print("The printer is low on toner.") 

currentPrinter=win32print.GetDefaultPrinterW()
win32print.SetDefaultPrinterW(printer)

import win32print
import win32ui
from PIL import Image, ImageWin


# Constants for GetDeviceCaps
#
#
# HORZRES / VERTRES = printable area
#
HORZRES = 8
VERTRES = 10
#
# LOGPIXELS = dots per inch
#
LOGPIXELSX = 88
LOGPIXELSY = 90
#
# PHYSICALWIDTH/HEIGHT = total area
#
PHYSICALWIDTH = 110
PHYSICALHEIGHT = 111
#
# PHYSICALOFFSETX/Y = left / top margin
#
PHYSICALOFFSETX = 112
PHYSICALOFFSETY = 113

def print_image(file_name):
 
    printer_name = win32print.GetDefaultPrinterW() # 获得默认打印机
    
    #
    # 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)
    # bmp.save("test1.png")
    if bmp.size[0] > bmp.size[1]:
        # bmp = bmp.rotate (90)
        bmp=bmp.transpose(Image.ROTATE_90)
    
    ratios = [1.0 * printable_area[0] / bmp.size[0], 1.0 * printable_area[1] / bmp.size[1]]
    scale = min (ratios)*0.85 #这个0.85的系数是不希望图片被打印太大，缺少margin，不方便文档的装订
    file_name=file_name.split("\\")[-1] #这一步是为了提取fullpath中的filename部分
    
    #
    # 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
    dib.draw (hDC.GetHandleOutput (), (x1, y1, x2, y2))
    
    hDC.EndPage ()
    hDC.EndDoc ()
    hDC.DeleteDC ()

def printer_loading(filename):
    # open (filename, "r")
    currentPrinter=win32print.GetDefaultPrinterW()
    win32api.ShellExecute (0,"print",filename,‘/d:"%s"‘ % currentPrinter,".",0)