Запуск только одного экземпляра приложения

[Namolem]

Как проверить, что приложение запущено в единственном экземпляре примерно представляю. А как еще при этом развернуть первое открытое приложение, спрятанное функцией Hide ?

[m0nax]

        [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
        static extern IntPtr FindWindowByCaption(IntPtr ZeroOnly, string lpWindowName);

        [DllImport("user32.dll")]
        static extern bool ShowWindow(IntPtr hWnd, ShowWindowCommand nCmdShow);

        enum ShowWindowCommand : int
        {
            /// <summary>
            /// Hides the window and activates another window.
            /// </summary>
            Hide = 0,
            /// <summary>
            /// 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.
            /// </summary>
            Normal = 1,
            /// <summary>
            /// Activates the window and displays it as a minimized window.
            /// </summary>
            ShowMinimized = 2,
            /// <summary>
            /// Maximizes the specified window.
            /// </summary>
            Maximize = 3, // is this the right value?
            /// <summary>
            /// Activates the window and displays it as a maximized window.
            /// </summary>       
            ShowMaximized = 3,
            /// <summary>
            /// Displays a window in its most recent size and position. This value 
            /// is similar to <see cref="Win32.ShowWindowCommand.Normal"/>, except 
            /// the window is not actived.
            /// </summary>
            ShowNoActivate = 4,
            /// <summary>
            /// Activates the window and displays it in its current size and position. 
            /// </summary>
            Show = 5,
            /// <summary>
            /// Minimizes the specified window and activates the next top-level 
            /// window in the Z order.
            /// </summary>
            Minimize = 6,
            /// <summary>
            /// Displays the window as a minimized window. This value is similar to
            /// <see cref="Win32.ShowWindowCommand.ShowMinimized"/>, except the 
            /// window is not activated.
            /// </summary>
            ShowMinNoActive = 7,
            /// <summary>
            /// Displays the window in its current size and position. This value is 
            /// similar to <see cref="Win32.ShowWindowCommand.Show"/>, except the 
            /// window is not activated.
            /// </summary>
            ShowNA = 8,
            /// <summary>
            /// 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.
            /// </summary>
            Restore = 9,
            /// <summary>
            /// 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.
            /// </summary>
            ShowDefault = 10,
            /// <summary>
            ///  <b>Windows 2000/XP:</b> 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.
            /// </summary>
            ForceMinimize = 11
        }

if(уже_запущено)
{
                    IntPtr handle = FindWindowByCaption(IntPtr.Zero, "Название окна");
                    ShowWindow(handle, ShowWindowCommand.Show);

}

(вместо enum можно просто числовое значение вписать)

[Namolem]

спасибо. А как при этом еще сделать, чтобы оно выходило на передний план?

[Namolem]

нашел

[DllImport("user32.dll")]
static extern bool SetForegroundWindow(IntPtr hWnd);