进程间通讯(转别人的windform)

<接收方>

public partial class FormServer : Form
    {
        const int WM_COPYDATA = 0x004A;

        public FormServer()
        {
            InitializeComponent();
        }

        protected override void DefWndProc(ref System.Windows.Forms.Message m)
        {
            switch (m.Msg)
            {
                case WM_COPYDATA:
                    COPYDATASTRUCT mystr = new COPYDATASTRUCT();
                    Type mytype = mystr.GetType();
                    mystr = (COPYDATASTRUCT)m.GetLParam(mytype);
                    this.textBox1.Text = mystr.lpData;
                    break;
                default:
                    base.DefWndProc(ref m);
                    break;
            }
        }

    }

    public struct COPYDATASTRUCT
    {
        public IntPtr dwData;
        public int cbData;
        [MarshalAs(UnmanagedType.LPStr)]
        public string lpData;
    }

 

<发送方>

        const int WM_COPYDATA = 0x004A;

        public FormClient()
        {
            InitializeComponent();
        }

        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage(
        int hWnd, // handle to destination window
        int Msg, // message
        int wParam, // first message parameter
        ref MCOPYDATASTRUCT lParam // second message parameter
        );

        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string lpClassName, string
        lpWindowName);

        private void button1_Click(object sender, System.EventArgs e)
        {
            int WINDOW_HANDLER = FindWindow(null, @"AAAAA");
            if (WINDOW_HANDLER == 0)
            {
            }
            else
            {
                byte[] sarr = System.Text.Encoding.Default.GetBytes(this.textBox1.Text);
                int len = sarr.Length;
                MCOPYDATASTRUCT cds;
                cds.dwData = (IntPtr)100;
                cds.lpData = this.textBox1.Text;
                cds.cbData = len + 1;
                SendMessage(WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);
            }
        }
        struct MCOPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }

转载于:https://www.cnblogs.com/fanybul/archive/2009/05/14/1456990.html