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我在双显示器系统（Windows7）上尝试了以下 Python 代码来重复保存屏幕截图。它生成 33 张 14.6MB（总共 482MB）的镜头，然后崩溃。使用 Process Explorer 检查我可以看到使用的内存量增加到大约 500MB。

我的问题是如何阻止内存泄漏？

import win32gui, win32ui, win32con, win32api
import time
import os


def my_capture(file_name):
    hwin = win32gui.GetDesktopWindow()
    width = win32api.GetSystemMetrics(win32con.SM_CXVIRTUALSCREEN)
    height = win32api.GetSystemMetrics(win32con.SM_CYVIRTUALSCREEN)
    left = win32api.GetSystemMetrics(win32con.SM_XVIRTUALSCREEN)
    top = win32api.GetSystemMetrics(win32con.SM_YVIRTUALSCREEN)
    hwindc = win32gui.GetWindowDC(hwin)
    srcdc = win32ui.CreateDCFromHandle(hwindc)
    memdc = srcdc.CreateCompatibleDC()
    bmp = win32ui.CreateBitmap()    
    bmp.CreateCompatibleBitmap(srcdc, width, height)
    memdc.SelectObject(bmp)
    memdc.BitBlt((0, 0), (width, height), srcdc, (left, top), win32con.SRCCOPY)
    bmp.SaveBitmapFile(memdc, file_name) # 'screenshot.bmp'


def captureAndSave(i):
    if i < 10:
        tmpStr = "00000" + str(i)
    elif i < 100:
        tmpStr = "0000" + str(i)
    elif i < 1000:
        tmpStr = "000" + str(i)
    elif i < 10000:
        tmpStr = "00" + str(i)
    elif i < 100000:
        tmpStr = "0" + str(i)
    else:
        tmpStr = str(i)

    my_capture(tmpStr + '.bmp')


def myMainLoop():
    i = 0
    while 1:
        i = i + 1
        captureAndSave(i)
        time.sleep(0.2)

#-----------------------------------------------------------------------------

if __name__ == '__main__':
    try:
        myMainLoop()        # capure all monitor windows
    except KeyboardInterrupt:
        pass

我的基本代码来自：没有 PIL 的 Python windows 7 screenshot：

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1 回答 1

2

您需要清理位图和 DC，在保存位图后添加类似这样的内容；

win32gui.DeleteObject(bmp.GetHandle())
memdc.DeleteDC()
srcdc.DeleteDC()
win32gui.ReleaseDC(hwin, hwindc)
于 2013-05-15T21:32:06.447 回答