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IsWindow function

Determines whether the specified window handle identifies an existing window.

Syntax


BOOL WINAPI IsWindow(
  _In_opt_  HWND hWnd
);

Parameters

hWnd [in, optional]

Type: HWND

A handle to the window to be tested.

Return value

Type:

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

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Winuser.h (include Windows.h)

Library

User32.lib

DLL

User32.dll

See also

Reference
IsWindowEnabled
IsWindowVisible
Conceptual
Windows

 

 

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