Python win32api 无法在 Windows Paint 应用程序上绘制

如何解决Python win32api 无法在 Windows Paint 应用程序上绘制

# code from https://codeloop.org/python-automation-drawing-in-paint-application/
import pyautogui,time
  
time.sleep(2)
 
pyautogui.click()
distance = 200
 
while distance > 0:
    pyautogui.dragrel(distance,duration=0.2) # move right
    distance = distance - 5
    pyautogui.dragrel(0,distance,duration=0.2) # move down
 
    pyautogui.dragrel(-distance,duration=0.2) #move left
    distance = distance - 5
 
    pyautogui.dragrel(0,-distance,duration=0.2) #move up

绘制以下图像

pyautogui 是一个很棒的工具，但它需要程序在前台运行。无论如何编写具有类似能力并在后台运行的代码？我试过win32api，

import win32gui
hwndMain = win32gui.FindWindow(None,"Untittled - Paint")
win32gui.SendMessage(hwnd,win32con.WM_LBUTTONDOWN,1,make_long(500,500))
win32gui.SendMessage(hwnd,win32con.WM_MOUSEMOVE,make_long(000,400))
win32gui.SendMessage(hwnd,win32con.WM_LBUTTONUP,make_long(900,900))

但它在“画图”应用中什么也没画。

解决方法

如果要发送绘图消息，应该找到MsPaint的子窗口，而不是直接发送给MsPaint。

这是一个示例，您可以参考：

import win32gui
import win32con
import win32api
def findMSPaintDrawWindow():
    res = win32gui.FindWindow(None,"Untitled - Paint");
    if(res != None):
        res = win32gui.FindWindowEx(res,None,"MSPaintView",None);
        if(res != None):
            res = win32gui.FindWindowEx(res,None)
    return res;


hwndMain = findMSPaintDrawWindow()

win32gui.SendMessage(hwndMain,win32con.WM_LBUTTONDOWN,1,win32api.MAKELONG(500,500))
win32gui.SendMessage(hwndMain,win32con.WM_MOUSEMOVE,win32api.MAKELONG(000,400))
win32gui.SendMessage(hwndMain,win32con.WM_LBUTTONUP,win32api.MAKELONG(900,900))

它对我有用：