IsWindow function (winuser.h)
Determines whether the specified window handle identifies an existing window.
Syntax
BOOL IsWindow(
[in, optional] HWND hWnd
);
Parameters
[in, optional] hWnd
Type: HWND
A handle to the window to be tested.
Return value
Type: BOOL
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.
Remarks
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.
Examples
For an example, see Creating a Modeless Dialog Box.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | winuser.h (include Windows.h) |
| Library | User32.lib |
| DLL | User32.dll |
| API set | ext-ms-win-ntuser-window-l1-1-0 (introduced in Windows 8) |
See also
Conceptual
Reference