[問題] 透過winapi繪圖
目的是：監控最上層視窗，然後畫一個方形在視窗內
問題：有時候方形有畫出來有時候又沒有，不知道這該如何處理?
參考結果圖片：
http://imgur.com/a/TQd5r
片段程式：
def callback(hWinEventHook, event, hwnd, idObject,
idChild, dwEventThread, dwmsEventTime):
print(GetWindowText(GetForegroundWindow()))
hdc = GetDC(hwnd)
left, top, right, bottom = GetClientRect(hwnd)
SetBkMode(hdc, win32con.OPAQUE)
Rectangle(hdc , left+3 , top+3 , right-3 , bottom-3)
ReleaseDC(hdc,hwnd)
WinEventProc = WinEventProcType(callback)
user32.SetWinEventHook.restype = ctypes.wintypes.HANDLE
hook = user32.SetWinEventHook(
EVENT_SYSTEM_FOREGROUND,
EVENT_SYSTEM_FOREGROUND,
0,
WinEventProc,
0,
0,
WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS
)
if hook == 0:
print('SetWinEventHook failed')
sys.exit(1)
msg = ctypes.wintypes.MSG()
while user32.GetMessageW(ctypes.byref(msg), 0, 0, 0) != 0:
user32.TranslateMessageW(msg)
user32.DispatchMessageW(msg)
user32.UnhookWinEvent(hook)
ole32.CoUninitialize()
--
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