Re: [Dev-C++] Hide/Show a Window

[<jos...@ya...>]

Alvaro, 

> Can anybody tell me how to Hide/Show a Window ? 

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

BOOL ShowWindow(

    HWND hWnd,	// handle of window
    int nCmdShow 	// show state of window
   );	
 

Parameters

hWnd

Identifies the window. 

nCmdShow

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: 

Value	Meaning
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, Windows 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_ flag 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. The
active window remains active.
SW_SHOWNA	Displays the window in its current state. The active window
remains active.
SW_SHOWNOACTIVATE	Displays a window in its most recent size and
position. The active window remains active.
SW_SHOWNORMAL	Activates and displays a window. If the window is
minimized or maximized, Windows restores it to its original size and
position. An application should specify this flag when displaying the
window for the first time.
 

Return Values

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

Remarks

The first time a program calls ShowWindow, it uses 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
STARTUPINFO 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. For example, Program Manager
specifies that applications start with a minimized main window. 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. 


> and how to put a icon in the
> system tray (when de window is not visible)?
> 
Use the function Shell_NotifyIcon (shellapi.h)

[Now Supported on Windows NT]

Sends a message to the system to add, modify, or delete an icon from
the taskbar status area.

WINSHELLAPI BOOL WINAPI Shell_NotifyIcon(

    DWORD dwMessage,	// message identifier
    PNOTIFYICONDATA pnid	// pointer to structure
   );	
 

Parameters

dwMessage

Identifier of the message to send. This parameter can be one of these
values:

NIM_ADD	Adds an icon to the status area.
NIM_DELETE	Deletes an icon from the status area.
NIM_MODIFY	Modifies an icon in the status area. 
 

pnid

Pointer to a NOTIFYICONDATA structure. The content of the structure
depends on the value of dwMessage. 

 

Return Values

If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero.

More info in theForger's tutorial or FAQ (I'm not sure). You can find a
link to that tutorials at

http://www.geocities.com/josempadron/esp/tutoriales.htm
http://www.geocities.com/josempadron/esp/pmf.htm

Hope this helps.

Chemanuel

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