[Win32 API] ShowWindow Function

Set the specified windows's show state.

Syntax

BOOL WINAPI ShowWindow(
  __in  HWND hWnd,
  __in  int nCmdShow
);

Parameter

• hWin : A handle to the window.
• nCmdShow : Controls how the window is to be shown.
• This parameter can be use one of the following values.

Value	Meaning
SW_FORCEMINIMIZE 11	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 0	Hides the window and activates another window.
SW_MAXIMIZE 3	Maximizes the specified window.
SW_MINIMIZE 6	Minimizes the specified window and activates the next top-level window in the Z order.
SW_RESTORE 9	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 5	Activates the window and displays it in its current size and position.
SW_SHOWDEFAULT 10	Sets the show state based on the SW_ value specified in theSTARTUPINFO structure passed to the CreateProcess function by the program that started the application.
SW_SHOWMAXIMIZED 3	Activates the window and displays it as a maximized window.
SW_SHOWMINIMIZED 2	Activates the window and displays it as a minimized window.
SW_SHOWMINNOACTIVE 7	Displays the window as a minimized window. This value is similar to SW_SHOWMINIMIZED, except the window is not activated.
SW_SHOWNA 8	Displays the window in its current size and position. This value is similar to SW_SHOW, except that the window is not activated.
SW_SHOWNOACTIVATE 4	Displays a window in its most recent size and position. This value is similar to SW_SHOWNORMAL, except that the window is not activated.
SW_SHOWNORMAL 1	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.

Retrun Value 

If the window was previously visible, the return value is nonzero(same as true).

otherwise, return zero(false)

Reference : http://msdn.microsoft.com/ko-kr/library/ms633548