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 ShowWindow

The ShowWindow function sets the specified window's show state.

Syntax

    BOOL ShowWindow(HWND hWnd, int nCmdShow);

Parameters

• hWnd [in] Handle to the window.
• nCmdShow
  [in] Specifies how the window is to be shown. This parameter is ignored the first time an application calls ShowWindow, if the program that launched the application provides a STARTUPINFO structure. Otherwise, the first time ShowWindow is called, the value should be the value obtained by the WinMain function in its nCmdShow parameter. In subsequent calls, this parameter can be one of the following values.
  SW_FORCEMINIMIZE
  Windows 2000/XP: Minimizes a window, even if the thread that owns the window is not responding. This flag should only be used when minimizing windows from a different thread.
  SW_HIDE
  Hides the window and activates another window.
  SW_MAXIMIZE
  Maximizes the specified window.
  SW_MINIMIZE
  Minimizes the specified window and activates the next top-level window in the Z order.
  SW_RESTORE
  Activates and displays the window. If the window is minimized or maximized, the system restores it to its original size and position. An application should specify this flag when restoring a minimized window.
  SW_SHOW
  Activates the window and displays it in its current size and position.
  SW_SHOWDEFAULT
  Sets the show state based on the SW_ value specified in the STARTUPINFO structure passed to the CreateProcess function by the program that started the application.
  SW_SHOWMAXIMIZED
  Activates the window and displays it as a maximized window.
  SW_SHOWMINIMIZED
  Activates the window and displays it as a minimized window.
  SW_SHOWMINNOACTIVE
  Displays the window as a minimized window. This value is similar to SW_SHOWMINIMIZED, except the window is not activated.
  SW_SHOWNA
  Displays the window in its current size and position. This value is similar to SW_SHOW, except the window is not activated.
  SW_SHOWNOACTIVATE
  Displays a window in its most recent size and position. This value is similar to SW_SHOWNORMAL, except the window is not actived.
  SW_SHOWNORMAL
  Activates and displays a window. If the window is minimized or maximized, the system restores it to its original size and position. An application should specify this flag when displaying the window for the first time.

Return Value

If the window was previously visible, the return value is nonzero.

If the window was previously hidden, the return value is zero.

Remarks

To perform certain special effects when showing or hiding a window, use AnimateWindow.

The first time an application calls ShowWindow, it should use the WinMain function's nCmdShow parameter as its nCmdShow parameter. Subsequent calls to ShowWindow must use one of the values in the given list, instead of the one specified by the WinMain function's nCmdShow parameter.

As noted in the discussion of the nCmdShow parameter, the nCmdShow value is ignored in the first call to ShowWindow if the program that launched the application specifies startup information in the structure. In this case, ShowWindow uses the information specified in the STARTUPINFO structure to show the window. On subsequent calls, the application must call ShowWindow with nCmdShow set to SW_SHOWDEFAULT to use the startup information provided by the program that launched the application. This behavior is designed for the following situations:

• Applications create their main window by calling CreateWindow with the WS_VISIBLE flag set.
• Applications create their main window by calling CreateWindow with the WS_VISIBLE flag cleared, and later call ShowWindow with the SW_SHOW flag set to make it visible. Example

Function Information

• Minimum DLL Version user32.dll
• Header Declared in Winuser.h, include Windows.h
• Import library User32.lib
• Minimum operating systems Windows 95, Windows NT 3.1
• Unicode Implemented as Unicode version.

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Notebook exported on Monday, 7 July 2008, 18:56:50 PM Eastern Daylight Time