python截屏 内存泄露 解决办法
http://stackoverflow.com/questions/16575193/memory-leak-python-windows-7-screenshots抓图步骤大致如下：
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'
但是如果是用于屏幕监控的，那么经过一段时间的loop，将很快耗尽内存，原因是资源没有释放
释放资源：
win32gui.DeleteObject(bmp.GetHandle())
memdc.DeleteDC()
srcdc.DeleteDC()
win32gui.ReleaseDC(hwin, hwindc)
PS：百度了半天也没找到解决方法，直接谷粉搜搜，老外程序员还是给力
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