using System;
using System.Runtime.InteropServices;


namespace TestHwnd
{
    public class Win32API
    {

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


        [DllImport("User32.dll", EntryPoint = "FindWindowEx")]
        public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpClassName, string lpWindowName);


        /// <summary>
        /// 自定义的结构
        /// </summary>
        public struct My_lParam
        {
            public int i;
            public string s;
        }
        /// <summary>
        /// 使用COPYDATASTRUCT来传递字符串
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public struct COPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }
        ////消息发送API
        //[DllImport("User32.dll", EntryPoint = "SendMessage")]
        //public static extern int SendMessage(
        //    IntPtr hWnd,        // 信息发往的窗口的句柄
        //    int Msg,            // 消息ID
        //    int wParam,         // 参数1
        //    int lParam          //参数2
        //);


        ////消息发送API
        //[DllImport("User32.dll", EntryPoint = "SendMessage")]
        //public static extern int SendMessage(
        //    IntPtr hWnd,        // 信息发往的窗口的句柄
        //    int Msg,            // 消息ID
        //    int wParam,         // 参数1
        //    ref My_lParam lParam //参数2
        //);

        ////消息发送API
        //[DllImport("User32.dll", EntryPoint = "SendMessage")]
        //public static extern int SendMessage(
        //    IntPtr hWnd,        // 信息发往的窗口的句柄
        //    int Msg,            // 消息ID
        //    int wParam,         // 参数1
        //    ref COPYDATASTRUCT lParam  //参数2
        //);


        //消息发送API
        [DllImport("User32.dll", EntryPoint = "PostMessage")]
        public static extern int PostMessage(
                        
            int Msg,            // 消息ID
            int id,         // 参数1
            string deviceId          // 参数2
        );



        ////消息发送API
        //[DllImport("User32.dll", EntryPoint = "PostMessage")]
        //public static extern int PostMessage(
        //    IntPtr hWnd,        // 信息发往的窗口的句柄
        //    int Msg,            // 消息ID
        //    int wParam,         // 参数1
        //    ref My_lParam lParam //参数2
        //);

        ////异步消息发送API
        //[DllImport("User32.dll", EntryPoint = "PostMessage")]
        //public static extern int PostMessage(
        //    IntPtr hWnd,        // 信息发往的窗口的句柄
        //    int Msg,            // 消息ID
        //    int wParam,         // 参数1
        //    ref COPYDATASTRUCT lParam  // 参数2
        //);


    }
}