IsWindow function (winuser.h)
Determines whether the specified window handle identifies an existing window.
BOOL IsWindow( HWND hWnd );
A handle to the window to be tested.
If the window handle identifies an existing window, the return value is nonzero.
If the window handle does not identify an existing window, the return value is zero.
A thread should not use IsWindow for a window that it did not create because the window could be destroyed after this function was called. Further, because window handles are recycled the handle could even point to a different window.
For an example, see Creating a Modeless Dialog Box.
|Minimum supported client||Windows 2000 Professional [desktop apps only]|
|Minimum supported server||Windows 2000 Server [desktop apps only]|
|Header||winuser.h (include Windows.h)|
|API set||ext-ms-win-ntuser-window-l1-1-0 (introduced in Windows 8)|