Change cursor in win32 window

Question

How do I change my cursor from arrow to hand when hovering over a button?

Answer 1

For those that are interested in changing the cursor only when the mouse is hovering (i.e., not moving) over a button -

Subclass procedure to use with SetWindowSubclass function -

LRESULT ButtonProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam, UINT_PTR uiSubclass, DWORD_PTR dwRefdata)
{
    static BOOL bTracking = FALSE;
    static HCURSOR handCursor = LoadCursor(NULL, IDC_HAND);

    switch (msg)
    {
    case WM_MOUSEMOVE:
        {
            if (!bTracking)
            {
                TRACKMOUSEEVENT tme{ sizeof tme };
                tme.dwFlags = TME_HOVER | TME_LEAVE;
                tme.dwHoverTime = HOVER_DEFAULT;
                tme.hwndTrack = hwnd;

                if (TrackMouseEvent(&tme))
                    bTracking = TRUE;
            }
        }
        break;
    case WM_MOUSEHOVER:
        {
            SetCursor(handCursor);
            bTracking = FALSE;
            return 0;
        }
        break;
    case WM_MOUSELEAVE:
        {
            bTracking = FALSE;
            return 0;
        }
        break;
    case WM_NCDESTROY:
        {
            RemoveWindowSubclass(hwnd, ButtonProc, uiSubclass);
        }
        break;
    }

    return DefSubclassProc(hwnd, msg, wParam, lParam);;
}

Answer 2

Just with WM_SETCURSOR

For example by subclassing a Button hWndButton :

BOOL bRet = SetWindowSubclass(hWndButton, ButtonSubclassProc, 0, 0);

with :

LRESULT CALLBACK ButtonSubclassProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData)
{
	switch (uMsg)
	{
	case WM_SETCURSOR:
	{
		SetCursor(LoadCursor(NULL, IDC_HAND));
		return FALSE;
	}
	}
	return DefSubclassProc(hWnd, uMsg, wParam, lParam);
}