windows.py 文件源码

def __init_screen_handles(self):
        # opengl windows cannot get from it's hwnd, so we use the screen
        hwnd = win32gui.GetDesktopWindow()
        # get screen size and offset
        left, top, right, bottom = self.rect
        width, height = right-left, bottom-top
        # the device context of the window 
        hdcwin = win32gui.GetWindowDC(hwnd)
        # make a temporary dc
        hdcmem = win32gui.CreateCompatibleDC(hdcwin)
        # make a temporary bitmap in memory, this is a PyHANDLE object
        hbmp = win32gui.CreateCompatibleBitmap(hdcwin, width, height)
        # select bitmap for temporary dc
        win32gui.SelectObject(hdcmem, hbmp)
        # check the bitmap object infomation
        bmp = win32gui.GetObject(hbmp)
        bi = BITMAPINFOHEADER()
        bi.biSize = ctypes.sizeof(BITMAPINFOHEADER)
        bi.biWidth = bmp.bmWidth
        bi.biHeight = bmp.bmHeight
        bi.biPlanes = bmp.bmPlanes
        bi.biBitCount = bmp.bmBitsPixel
        bi.biCompression = 0 # BI_RGB
        bi.biSizeImage = 0
        bi.biXPelsPerMeter = 0
        bi.biYPelsPerMeter = 0
        bi.biClrUsed = 0
        bi.biClrImportant = 0
        # calculate total size for bits
        pixel = bmp.bmBitsPixel
        size = ((bmp.bmWidth * pixel + pixel - 1)/pixel) * 4 * bmp.bmHeight
        buf = (ctypes.c_char * size)()

        self._hdcwin = hdcwin
        self._hdcmem = hdcmem
        self._bi = bi
        self._hbmp = hbmp
        self._buf = buf