Getting 2 pointerup messages for 1 pointerdown message in chrome or firefox

See more:

Windows

hooking

WinAPI

C++14

Hi All,

I am capturing the count of PointerDown and PointerUp touch events, using global hook 'WH_GETMESSAGE'. For every PointerDown touch, I am supposed to get one PointerUp touch. But in case of touch events inside google chrome or firefox, I am getting 2 pointerUp events for 1 pointerDown event. Any idea why? Also, is there any way to know if I am touching a google chrome window or a firefox

What I have tried:

LRESULT CALLBACK GetMsgProc(int nCode, WPARAM wParam, LPARAM lParam)
{
	LPMSG lpMsg = (LPMSG)lParam;
	UINT32 pointerId = GET_POINTERID_WPARAM(lpMsg->wParam);
	switch (lpMsg->message)
	{
	case WM_POINTERDOWN:
		POINTER_INPUT_TYPE pointerType;
		GetPointerType(pointerId, &pointerType);
                if (pointerType == PT_TOUCH)
			OutputDebugString(TEXT("Hook: PointerDown Touch"));
                return CallNextHookEx(NULL, nCode, wParam, lParam);

	case WM_POINTERUP:
		POINTER_INPUT_TYPE pointerTypeUp;
		GetPointerType(pointerId, &pointerTypeUp);
		if (pointerTypeUp == PT_TOUCH)
			OutputDebugString(TEXT("Hook: PointerUp Touch"));
                return CallNextHookEx(NULL, nCode, wParam, lParam);
	}
	return CallNextHookEx(NULL, nCode, wParam, lParam);
}