Capture d'ecran bureau en "background"

Salut, on t'aurait tout aussi bien répondu sur CSharpFR, si la réponse te convient je déplacerais le thread.


[ SuppressUnmanagedCodeSecurity ]
internal static class Win32
{
    [ StructLayout( LayoutKind.Sequential ) ]
    private struct RECT
    {
        public int left;
        public int top;
        public int right;
        public int bottom;
    }

    //[ DllImport( "user32.dll" ) ]
    //private static extern IntPtr GetDesktopWindow( );

    [ DllImport( "user32.dll" ) ]
    [ return: MarshalAs( UnmanagedType.Bool ) ]
    private static extern bool PrintWindow(
        IntPtr hWnd, IntPtr hDCBlt, uint nFlags );

    [ DllImport( "user32.dll", SetLastError = true ) ]
    [ return: MarshalAs( UnmanagedType.Bool ) ]
    private static extern bool GetWindowRect(
        IntPtr hWnd, out RECT lpRect );

    [ DllImport( "user32.dll",
        CharSet = CharSet.Unicode, SetLastError = true ) ]
    private static extern IntPtr FindWindow(
        string lpClassName, string lpWindowName );

    [ DllImport( "user32.dll",
        CharSet = CharSet.Unicode, SetLastError = true ) ]
    private static extern IntPtr FindWindowEx( IntPtr hwndParent,
        IntPtr hwndChildAfter, string lpszClass, string lpszWindow );

    private static IntPtr FindDesktopWindow( )
    {
        IntPtr hWnd = FindWindow( "Progman", "Program Manager" );
        if ( hWnd != IntPtr.Zero )
        {
            hWnd = FindWindowEx( hWnd,
                IntPtr.Zero, "SHELLDLL_DefView", null );
            if ( hWnd != IntPtr.Zero )
            {
                hWnd = FindWindowEx( hWnd,
                    IntPtr.Zero, "SysListView32", null );
            }
        }

        return hWnd;
    }

    public static Bitmap GetTaskBarBitmap( )
    {
        Bitmap bmp = null;
        IntPtr hWnd = FindWindow( "Shell_TrayWnd", null );
        if ( hWnd != IntPtr.Zero )
        {
            RECT rect;
            if ( GetWindowRect( hWnd, out rect ) )
            {
                int width = rect.right - rect.left;
                int height = rect.bottom - rect.top;
                bmp = new Bitmap( width, height,
                    PixelFormat.Format24bppRgb ); // Verifier Screen BPP.
                using ( Graphics g = Graphics.FromImage( bmp ) )
                {
                    IntPtr hDC = g.GetHdc( );
                    PrintWindow( hWnd, hDC, 0 );
                    g.ReleaseHdc( hDC );
                }
            }
        }

        return bmp;
    }

    public static Bitmap GetDesktopBitmap( )
    {
        Bitmap bmp = null;
        IntPtr hWnd = FindDesktopWindow( );
        if ( hWnd != IntPtr.Zero )
        {
            RECT rect;
            if ( GetWindowRect( hWnd, out rect ) )
            {
                int width = rect.right - rect.left;
                int height = rect.bottom - rect.top;
                bmp = new Bitmap( width, height,
                    PixelFormat.Format24bppRgb ); // Verifier Screen BPP.
                using ( Graphics g = Graphics.FromImage( bmp ) )
                {
                    IntPtr hDC = g.GetHdc( );
                    PrintWindow( hWnd, hDC, 0 );
                    g.ReleaseHdc( hDC );
                }
            }
        }

        return bmp;
    }
}