我们从Python开源项目中，提取了以下13个代码示例，用于说明如何使用win32gui.ReleaseDC()。
def WindowDraw(self, rect): ''' Draws a rectangle to the window ''' if self.hwnd is None: return #raise Exception("HWND is none. HWND not called or invalid window name provided.") wDC = win32gui.GetWindowDC(self.hwnd) dcObj = win32ui.CreateDCFromHandle(wDC) #Set background mode to transparent #dcObj.SetBkColor(0x12345) #dcObj.SetBkMode(0) dcObj.Rectangle(rect) # Free Resources dcObj.DeleteDC() win32gui.ReleaseDC(self.hwnd, wDC)
def grab_screen(region=None): hwin = win32gui.GetDesktopWindow() if region: left,top,x2,y2 = region width = x2 - left + 1 height = y2 - top + 1 else: 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) signedIntsArray = bmp.GetBitmapBits(True) img = np.fromstring(signedIntsArray, dtype='uint8') img.shape = (height,width,4) srcdc.DeleteDC() memdc.DeleteDC() win32gui.ReleaseDC(hwin, hwindc) win32gui.DeleteObject(bmp.GetHandle()) return cv2.cvtColor(img, cv2.COLOR_BGRA2RGB)
def grab_screen(region=None, title=None): hwin = win32gui.GetDesktopWindow() if region: left,top,x2,y2 = region width = x2 - left + 1 height = y2 - top + 1 elif title: gtawin = win32gui.FindWindow(None, title) if not gtawin: raise Exception('window title not found') #get the bounding box of the window left, top, x2, y2 = win32gui.GetWindowRect(gtawin) width = x2 - left +1 height = y2 - top +1 else: 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) signedIntsArray = bmp.GetBitmapBits(True) img = np.fromstring(signedIntsArray, dtype='uint8') img.shape = (height,width,4) srcdc.DeleteDC() memdc.DeleteDC() win32gui.ReleaseDC(hwin, hwindc) win32gui.DeleteObject(bmp.GetHandle()) return cv2.cvtColor(img, cv2.COLOR_BGRA2RGB)
def __del__(self): # cleanup hwnd = win32gui.GetDesktopWindow() win32gui.DeleteObject(self._hbmp) win32gui.DeleteObject(self._hdcmem) win32gui.ReleaseDC(hwnd, self._hdcwin)
def GetScreenImg(self): ''' Gets the screen of the window referenced by self.hwnd ''' if self.hwnd is None: raise Exception("HWND is none. HWND not called or invalid window name provided.") self.l, self.t, self.r, self.b = win32gui.GetWindowRect(self.hwnd) #Remove border around window (8 pixels on each side) #Remove 4 extra pixels from left and right 16 + 8 = 24 w = self.r - self.l - self.br - self.bl #Remove border on top and bottom (31 on top 8 on bottom) #Remove 12 extra pixels from bottom 39 + 12 = 51 h = self.b - self.t - self.bt - self.bb wDC = win32gui.GetWindowDC(self.hwnd) dcObj = win32ui.CreateDCFromHandle(wDC) cDC = dcObj.CreateCompatibleDC() dataBitMap = win32ui.CreateBitmap() dataBitMap.CreateCompatibleBitmap(dcObj, w, h) cDC.SelectObject(dataBitMap) #First 2 tuples are top-left and bottom-right of destination #Third tuple is the start position in source cDC.BitBlt((0,0), (w, h), dcObj, (self.bl, self.bt), win32con.SRCCOPY) bmInfo = dataBitMap.GetInfo() im = np.frombuffer(dataBitMap.GetBitmapBits(True), dtype = np.uint8) dcObj.DeleteDC() cDC.DeleteDC() win32gui.ReleaseDC(self.hwnd, wDC) win32gui.DeleteObject(dataBitMap.GetHandle()) #Bitmap has 4 channels like: BGRA. Discard Alpha and flip order to RGB #31 pixels from border on top, 8 on bottom #8 pixels from border on the left and 8 on right #Remove 1 additional pixel from left and right so size is 1278 | 9 #Remove 14 additional pixels from bottom so size is 786 | 6 #return im.reshape(bmInfo['bmHeight'], bmInfo['bmWidth'], 4)[31:-22, 9:-9, -2::-1] #For 800x600 images: #Remove 12 pixels from bottom + border #Remove 4 pixels from left and right + border return im.reshape(bmInfo['bmHeight'], bmInfo['bmWidth'], 4)[:, :, -2::-1]
def screen(self): """PIL Image of current window screen. (the window must be on the top) reference: https://msdn.microsoft.com/en-us/library/dd183402(v=vs.85).aspx""" # opengl windows cannot get from it's hwnd, so we use the screen hwnd = win32gui.GetDesktopWindow() # get window 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) # copy bits to temporary dc win32gui.BitBlt(hdcmem, 0, 0, width, height, hdcwin, left, top, win32con.SRCCOPY) # 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)() # read bits into buffer windll.gdi32.GetDIBits(hdcmem, hbmp.handle, 0, bmp.bmHeight, buf, ctypes.byref(bi), win32con.DIB_RGB_COLORS) # make a PIL Image img = Image.frombuffer('RGB', (bmp.bmWidth, bmp.bmHeight), buf, 'raw', 'BGRX', 0, 1) img = img.transpose(Image.FLIP_TOP_BOTTOM) # cleanup win32gui.DeleteObject(hbmp) win32gui.DeleteObject(hdcmem) win32gui.ReleaseDC(hwnd, hdcwin) return img
