using System;

using System.Runtime.InteropServices;

using System.Threading;

using System.Windows.Forms;

namespace TestForWechat

{

    class Program

    {

        [DllImport("user32.dll")]

        static extern IntPtr FindWindow(String ClassName, String WindwosName);    

        [DllImport("user32")]

        static extern int SetForegroundWindow(IntPtr hwnd);

        public static string sendmsg;

        public static int Count;

        public static  readonly string ClassNameForWeChat= "WeChatMainWndForPC";

        [STAThread]

        static void Main(string[] args)

        {

            ReadMe();

            Init();

            while(IsContinue()) Init(); 

        }

        static void ReadMe()

        {

            Console.WriteLine("请不要发送大量次数，本程序是每次发送字符时候都会强制焦点微信窗口");

            Console.WriteLine("使用方式:");

            Console.WriteLine("一：确保微信发送的接收方正确");

            Console.WriteLine("二：输入发送的字符");

            Console.WriteLine("三：输入发送次数");

        }

        static void Work()

        {

            while (Count > -)

            {

                Thread.Sleep(TimeSpan.FromMilliseconds());

                SendKey(ClassNameForWeChat);

                Count--;

                Console.WriteLine("发送次数" + Count);

            }

            Console.WriteLine("发送完毕");

        }

        static bool IsContinue()

        {

            bool rest = false;

            Console.WriteLine("是否继续?(Y/N)");

            var key = Console.ReadKey();

            switch(key.KeyChar)

            {

                case 'y':

                case 'Y':

                    rest = true;

                    break;

                case 'N':

                case 'n':

                    rest = false;

                    break;

            }

            Console.WriteLine();

            return rest;

        }

        static void Init()

        {

            Console.WriteLine("要发送的字符");

            sendmsg = Console.ReadLine();

            Console.WriteLine("要发送的次数");

            Count = int.Parse(Console.ReadLine());

            Console.WriteLine();

            Work();

        }

        static void SendKey(string name)

        {

            IntPtr win =FindWindow(name,null);

            SetForegroundWindow(win);

            SendKeys.SendWait(sendmsg);

            SendKeys.SendWait("{ENTER}");

        }

    }

}