Python win32api 无法在 Windows Paint Application 上绘图

Question

我想写一个功能与

类似的代码

# 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, 0, duration=0.2) # move right
    distance = distance - 5
    pyautogui.dragRel(0, distance, duration=0.2) # move down
 
    pyautogui.dragRel(-distance, 0, duration=0.2) #move left
    distance = distance - 5
 
    pyautogui.dragRel(0, -distance, duration=0.2) #move up

其中绘制了以下图像

PyautoGui 是一个很棒的工具，但是它需要程序在运行前台。有没有办法在后台编写具有类似能力和运行s 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, 1, make_long(000, 400))
win32gui.SendMessage(hwnd, win32con.WM_LBUTTONUP, 1, make_long(900, 900))

但它在“画图”应用程序中不绘制任何内容。

Answer 1

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

这里有一个例子，你可以参考一下：

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, None, None)
    return res;


hwndMain = findMSPaintDrawWindow()

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

它对我有用：

Python win32api 无法在 Windows Paint Application 上绘图

Python win32api cannot draw on Windows Paint Application

python

winapi

win32gui

pyautogui