Встраивание окна внешнего приложения в форму

static class WinAPI {
    [Flags()]
    internal enum SetWindowPosFlags : uint {
        /// <summary>If the calling thread and the thread that owns the window are attached to different input queues, 
        /// the system posts the request to the thread that owns the window. This prevents the calling thread from 
        /// blocking its execution while other threads process the request.</summary>
        /// <remarks>SWP_ASYNCWINDOWPOS</remarks>
        AsynchronousWindowPosition = 0x4000,
        /// <summary>Prevents generation of the WM_SYNCPAINT message.</summary>
        /// <remarks>SWP_DEFERERASE</remarks>
        DeferErase = 0x2000,
        /// <summary>Draws a frame (defined in the window's class description) around the window.</summary>
        /// <remarks>SWP_DRAWFRAME</remarks>
        DrawFrame = 0x0020,
        /// <summary>Applies new frame styles set using the SetWindowLong function. Sends a WM_NCCALCSIZE message to 
        /// the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE 
        /// is sent only when the window's size is being changed.</summary>
        /// <remarks>SWP_FRAMECHANGED</remarks>
        FrameChanged = 0x0020,
        /// <summary>Hides the window.</summary>
        /// <remarks>SWP_HIDEWINDOW</remarks>
        HideWindow = 0x0080,
        /// <summary>Does not activate the window. If this flag is not set, the window is activated and moved to the
        /// top of either the topmost or non-topmost group (depending on the setting of the hWndInsertAfter 
        /// parameter).</summary>
        /// <remarks>SWP_NOACTIVATE</remarks>
        DoNotActivate = 0x0010,
        /// <summary>Discards the entire contents of the client area. If this flag is not specified, the valid 
        /// contents of the client area are saved and copied back into the client area after the window is sized or 
        /// repositioned.</summary>
        /// <remarks>SWP_NOCOPYBITS</remarks>
        DoNotCopyBits = 0x0100,
        /// <summary>Retains the current position (ignores X and Y parameters).</summary>
        /// <remarks>SWP_NOMOVE</remarks>
        IgnoreMove = 0x0002,
        /// <summary>Does not change the owner window's position in the Z order.</summary>
        /// <remarks>SWP_NOOWNERZORDER</remarks>
        DoNotChangeOwnerZOrder = 0x0200,
        /// <summary>Does not redraw changes. If this flag is set, no repainting of any kind occurs. This applies to 
        /// the client area, the nonclient area (including the title bar and scroll bars), and any part of the parent 
        /// window uncovered as a result of the window being moved. When this flag is set, the application must 
        /// explicitly invalidate or redraw any parts of the window and parent window that need redrawing.</summary>
        /// <remarks>SWP_NOREDRAW</remarks>
        DoNotRedraw = 0x0008,
        /// <summary>Same as the SWP_NOOWNERZORDER flag.</summary>
        /// <remarks>SWP_NOREPOSITION</remarks>
        DoNotReposition = 0x0200,
        /// <summary>Prevents the window from receiving the WM_WINDOWPOSCHANGING message.</summary>
        /// <remarks>SWP_NOSENDCHANGING</remarks>
        DoNotSendChangingEvent = 0x0400,
        /// <summary>Retains the current size (ignores the cx and cy parameters).</summary>
        /// <remarks>SWP_NOSIZE</remarks>
        IgnoreResize = 0x0001,
        /// <summary>Retains the current Z order (ignores the hWndInsertAfter parameter).</summary>
        /// <remarks>SWP_NOZORDER</remarks>
        IgnoreZOrder = 0x0004,
        /// <summary>Displays the window.</summary>
        /// <remarks>SWP_SHOWWINDOW</remarks>
        ShowWindow = 0x0040,
    }
    /// <summary>
    /// Задание положения окна
    /// </summary>
    /// <param name="hWnd">Дескриптор окна</param>
    /// <param name="hWndInsertAfter">Дескриптор родительского окна</param>
    /// <param name="X">Положение по горизонтали</param>
    /// <param name="Y">Положение по вертикали</param>
    /// <param name="cx">Ширина</param>
    /// <param name="cy">Высота</param>
    /// <param name="uFlags">Флаги</param>
    /// <returns></returns>
    [DllImport("user32.dll", SetLastError = true)]
    internal static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, SetWindowPosFlags uFlags);
    [DllImport("user32.dll", SetLastError = true)]
    internal static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
    [DllImport("user32.dll", SetLastError = true)]
    internal static extern IntPtr FindWindow(IntPtr ZeroOnly, string lpWindowName);
}

static class WinAPI {
    internal enum WindowLongFlags : int {
        GWL_EXSTYLE = -20,
        GWLP_HINSTANCE = -6,
        GWLP_HWNDPARENT = -8,
        GWL_ID = -12,
        GWL_STYLE = -16,
        GWL_USERDATA = -21,
        GWL_WNDPROC = -4,
        DWLP_USER = 0x8,
        DWLP_MSGRESULT = 0x0,
        DWLP_DLGPROC = 0x4
    }
    [Flags()]
    internal enum WindowStyle : uint {
        WS_BORDER = 0x00800000,
        WS_CAPTION = 0x00C00000,
        WS_CHILD = 0x40000000,
        WS_CLIPCHILDREN = 0x02000000,
        WS_CLIPSIBLINGS = 0x04000000,
        WS_DISABLED = 0x08000000,
        WS_DLGFRAME = 0x00400000,
        WS_GROUP = 0x00020000,
        WS_HSCROLL = 0x00100000,
        WS_MAXIMIZE = 0x01000000,
        WS_MAXIMIZEBOX = 0x00010000,
        WS_MINIMIZE = 0x20000000,
        WS_MINIMIZEBOX = 0x00020000,
        WS_OVERLAPPED = 0x00000000,
        WS_POPUP = 0x80000000,
        WS_POPUPWINDOW = WS_BORDER | WS_SYSMENU | WS_POPUP,
        WS_OVERLAPPEDWINDOW = WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME,
        WS_SIZEBOX = 0x00040000,
        WS_SYSMENU = 0x00080000,
        WS_TABSTOP = 0x00010000,
        WS_THICKFRAME = WS_SIZEBOX,
        WS_TILED = WS_OVERLAPPED,
        WS_TILEDWINDOW = WS_OVERLAPPEDWINDOW,
        WS_VISIBLE = 0x10000000,
        WS_VSCROLL = 0x00200000
    }
    [Flags()]
    internal enum SetWindowPosFlags : uint {
        /// <summary>If the calling thread and the thread that owns the window are attached to different input queues, 
        /// the system posts the request to the thread that owns the window. This prevents the calling thread from 
 
        /// blocking its execution while other threads process the request.</summary>
        /// <remarks>SWP_ASYNCWINDOWPOS</remarks>
        AsynchronousWindowPosition = 0x4000,
        /// <summary>Prevents generation of the WM_SYNCPAINT message.</summary>
        /// <remarks>SWP_DEFERERASE</remarks>
        DeferErase = 0x2000,
        /// <summary>Draws a frame (defined in the window's class description) around the window.</summary>
        /// <remarks>SWP_DRAWFRAME</remarks>
        DrawFrame = 0x0020,
        /// <summary>Applies new frame styles set using the SetWindowLong function. Sends a WM_NCCALCSIZE message to 
        /// the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE 
        /// is sent only when the window's size is being changed.</summary>
        /// <remarks>SWP_FRAMECHANGED</remarks>
        FrameChanged = 0x0020,
        /// <summary>Hides the window.</summary>
        /// <remarks>SWP_HIDEWINDOW</remarks>
        HideWindow = 0x0080,
        /// <summary>Does not activate the window. If this flag is not set, the window is activated and moved to the
        /// top of either the topmost or non-topmost group (depending on the setting of the hWndInsertAfter 
        /// parameter).</summary>
        /// <remarks>SWP_NOACTIVATE</remarks>
        DoNotActivate = 0x0010,
        /// <summary>Discards the entire contents of the client area. If this flag is not specified, the valid 
        /// contents of the client area are saved and copied back into the client area after the window is sized or 
        /// repositioned.</summary>
        /// <remarks>SWP_NOCOPYBITS</remarks>
        DoNotCopyBits = 0x0100,
        /// <summary>Retains the current position (ignores X and Y parameters).</summary>
        /// <remarks>SWP_NOMOVE</remarks>
        IgnoreMove = 0x0002,
        /// <summary>Does not change the owner window's position in the Z order.</summary>
        /// <remarks>SWP_NOOWNERZORDER</remarks>
        DoNotChangeOwnerZOrder = 0x0200,
        /// <summary>Does not redraw changes. If this flag is set, no repainting of any kind occurs. This applies to 
        /// the client area, the nonclient area (including the title bar and scroll bars), and any part of the parent 
        /// window uncovered as a result of the window being moved. When this flag is set, the application must 
        /// explicitly invalidate or redraw any parts of the window and parent window that need redrawing.</summary>
        /// <remarks>SWP_NOREDRAW</remarks>
        DoNotRedraw = 0x0008,
        /// <summary>Same as the SWP_NOOWNERZORDER flag.</summary>
        /// <remarks>SWP_NOREPOSITION</remarks>
        DoNotReposition = 0x0200,
        /// <summary>Prevents the window from receiving the WM_WINDOWPOSCHANGING message.</summary>
        /// <remarks>SWP_NOSENDCHANGING</remarks>
        DoNotSendChangingEvent = 0x0400,
        /// <summary>Retains the current size (ignores the cx and cy parameters).</summary>
        /// <remarks>SWP_NOSIZE</remarks>
        IgnoreResize = 0x0001,
        /// <summary>Retains the current Z order (ignores the hWndInsertAfter parameter).</summary>
        /// <remarks>SWP_NOZORDER</remarks>
        IgnoreZOrder = 0x0004,
        /// <summary>Displays the window.</summary>
        /// <remarks>SWP_SHOWWINDOW</remarks>
        ShowWindow = 0x0040,
    }
    /// <summary>
    /// Задание положения окна
    /// </summary>
    /// <param name="hWnd">Дескриптор окна</param>
    /// <param name="hWndInsertAfter">Дескриптор родительского окна</param>
    /// <param name="X">Положение по горизонтали</param>
    /// <param name="Y">Положение по вертикали</param>
    /// <param name="cx">Ширина</param>
    /// <param name="cy">Высота</param>
    /// <param name="uFlags">Флаги</param>
    [DllImport("user32.dll", SetLastError = true)]
    internal static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, SetWindowPosFlags uFlags);
    [DllImport("user32.dll", SetLastError = true)]
    internal static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
    [DllImport("user32.dll", SetLastError = true)]
    internal static extern IntPtr FindWindow(IntPtr ZeroOnly, string lpWindowName);
    [DllImport("user32.dll", SetLastError = true)]
    internal static extern int GetWindowLong(IntPtr hWnd, int nIndex);
    /// <summary>
    /// Изменение атрибутов указанного окна
    /// </summary>
    /// <param name="hWnd">Дескриптор окна</param>
    /// <param name="nIndex">Смещение от нуля значения, которое нужно Изменить.</param>
    /// <param name="dwNewLong">Новое значение</param>
    [DllImport("user32.dll")]
    internal static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
    internal const int GWL_STYLE = 16;
}