TileWindows function (winuser.h)

Article
10/13/2021

Tiles the specified child windows of the specified parent window.

Syntax

WORD TileWindows(
  [in, optional] HWND       hwndParent,
  [in]           UINT       wHow,
  [in, optional] const RECT *lpRect,
  [in]           UINT       cKids,
  [in, optional] const HWND *lpKids
);

Parameters

[in, optional] hwndParent

Type: HWND

A handle to the parent window. If this parameter is NULL, the desktop window is assumed.

[in] wHow

Type: UINT

The tiling flags. This parameter can be one of the following values—optionally combined with MDITILE_SKIPDISABLED to prevent disabled MDI child windows from being tiled.

Value	Meaning
MDITILE_HORIZONTAL 0x0001	Tiles windows horizontally.
MDITILE_VERTICAL 0x0000	Tiles windows vertically.

[in, optional] lpRect

Type: const RECT*

A pointer to a structure that specifies the rectangular area, in client coordinates, within which the windows are arranged. If this parameter is NULL, the client area of the parent window is used.

[in] cKids

Type: UINT

The number of elements in the array specified by the lpKids parameter. This parameter is ignored if lpKids is NULL.

[in, optional] lpKids

Type: const HWND*

An array of handles to the child windows to arrange. If a specified child window is a top-level window with the style WS_EX_TOPMOST or WS_EX_TOOLWINDOW, the child window is not arranged. If this parameter is NULL, all child windows of the specified parent window (or of the desktop window) are arranged.

Return value

Type: WORD

If the function succeeds, the return value is the number of windows arranged.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

Calling TileWindows causes all maximized windows to be restored to their previous size.

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