[转]C#API 实现锁屏+关屏

http://www.cnblogs.com/1971ruru/archive/2010/05/20/1740216.html

public Form1( bool aLock ) {

            if (aLock) {

                //锁屏+关屏

                LockWorkStation();

                SendMessage( this.Handle, (uint)0x0112, (IntPtr)0xF170, (IntPtr)2 );

            }

            else {

                //禁止鼠标键盘动作+关屏

                BlockInput( true );

                System.Threading.Thread.Sleep( 10 );

                SendMessage( this.Handle, (uint)0x0112, (IntPtr)0xF170, (IntPtr)2 );

                BlockInput( false );

            }

            this.Close();

            //Application.Exit();

            Environment.Exit( 0 );

        }

        //关屏

        [DllImport( "user32.dll", CharSet = CharSet.Auto )]

        static extern IntPtr SendMessage( IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam );

        //禁止鼠标键盘动作

        [return: MarshalAs( UnmanagedType.Bool )]

        [DllImport( "user32.dll", CharSet = CharSet.Auto, ExactSpelling = true )]

        public static extern bool BlockInput( [In, MarshalAs( UnmanagedType.Bool )] bool fBlockIt );

        //锁屏

        [DllImport( "user32.dll" )]

        public static extern bool LockWorkStation();

需要指出的是，在退出程序时使用Environment.Exit( 0 );而非Application.Exit();否则会出错哦~~提示类似：“***遇到错误，需要关闭”。

还有就是修改一下Main:

static void Main(string[] args) {

            //Application.EnableVisualStyles();

            //Application.SetCompatibleTextRenderingDefault( false );

            if (args == null || args.Length == 0) {

                //禁止鼠标键盘动作+关屏

                Application.Run( new Form1( false ) );

            }

            else {

                //锁屏+关屏

                Application.Run( new Form1( true ) );

            }

        }

..

如此即可大功告成了。。。

之所以要禁用鼠标键盘，是为了关屏成功。。。