PC微信多开器，C#编写，C++ DLL

PC微信多开，无限多开。源代码使用C#编写，调用C++编写的DLL文件。如何编写这个C++的DLL，请查看帮助。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CSMultiWeChat
{
    public partial class Form1 : Form
    {
        public Form1（）
        {
            InitializeComponent（）;
        }

        private void Button1_Click（object sender EventArgs e）
        {
            int a = WeChatMultiOpen（）;
            this.textBox1.AppendText（a + Environment.NewLine）;
        }

        [DllImport（“CMultiWeChat.dll“）]
        public static extern int WeChatMultiOpen（）;

        private void Button2_Click（object sender EventArgs e）
        {
            this.textBox1.AppendText（“网易云课堂：“ + Environment.NewLine +
                “《如何干掉禁止多开【关闭Mutex版】（纯实战》“ + Environment.NewLine +
                “《【编程】以关闭Mutex的方式实现微信多开》“）;
            String netStudyUrl = “https://study.163.com/course/introduction/1209042813.htm?utm_source=qq&utm_medium=webShare&utm_campaign=share&utm_content=courseIntro&share=2&shareId=480000001858469“;
            Process.Start（netStudyUrl）;

        }
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2019-02-26 10:29  CSMultiWeChat\
     文件         189  2019-02-21 11:05  CSMultiWeChat\App.config
     文件       47616  2019-02-21 11:24  CSMultiWeChat\CMultiWeChat.dll
     文件        3764  2019-02-21 11:24  CSMultiWeChat\CSMultiWeChat.csproj
     文件        3433  2019-02-26 10:29  CSMultiWeChat\Form1.Designer.cs
     文件        1350  2019-02-26 10:29  CSMultiWeChat\Form1.cs
     文件        5817  2019-02-26 10:29  CSMultiWeChat\Form1.resx
     文件         525  2019-02-21 11:05  CSMultiWeChat\Program.cs
     目录           0  2019-02-21 11:05  CSMultiWeChat\Properties\
     文件        1324  2019-02-21 11:05  CSMultiWeChat\Properties\AssemblyInfo.cs
     文件        2839  2019-02-21 11:05  CSMultiWeChat\Properties\Resources.Designer.cs
     文件        5612  2019-02-21 11:05  CSMultiWeChat\Properties\Resources.resx
     文件        1100  2019-02-21 11:05  CSMultiWeChat\Properties\Settings.Designer.cs
     文件         249  2019-02-21 11:05  CSMultiWeChat\Properties\Settings.settings
     目录           0  2019-02-21 11:05  CSMultiWeChat\bin\
     目录           0  2019-02-21 11:27  CSMultiWeChat\bin\Debug\
     文件       47616  2019-02-21 11:24  CSMultiWeChat\bin\Debug\CMultiWeChat.dll
     文件        9216  2019-02-26 10:28  CSMultiWeChat\bin\Debug\CSMultiWeChat.exe
     文件         189  2019-02-21 11:05  CSMultiWeChat\bin\Debug\CSMultiWeChat.exe.config
     文件       28160  2019-02-26 10:28  CSMultiWeChat\bin\Debug\CSMultiWeChat.pdb
     目录           0  2019-02-21 11:05  CSMultiWeChat\obj\
     目录           0  2019-02-26 10:28  CSMultiWeChat\obj\Debug\
     文件         180  2019-02-26 10:28  CSMultiWeChat\obj\Debug\CSMultiWeChat.Form1.resources
     文件         180  2019-02-21 11:27  CSMultiWeChat\obj\Debug\CSMultiWeChat.Properties.Resources.resources
     文件          42  2019-02-21 11:05  CSMultiWeChat\obj\Debug\CSMultiWeChat.csproj.CoreCompileInputs.cache
     文件        1147  2019-02-26 10:27  CSMultiWeChat\obj\Debug\CSMultiWeChat.csproj.FileListAbsolute.txt
     文件        1012  2019-02-26 10:28  CSMultiWeChat\obj\Debug\CSMultiWeChat.csproj.GenerateResource.cache
     文件         424  2019-02-26 10:27  CSMultiWeChat\obj\Debug\CSMultiWeChat.csprojAssemblyReference.cache
     文件        9216  2019-02-26 10:28  CSMultiWeChat\obj\Debug\CSMultiWeChat.exe
     文件       28160  2019-02-26 10:28  CSMultiWeChat\obj\Debug\CSMultiWeChat.pdb
     文件        1435  2019-02-26 10:22  CSMultiWeChat\obj\Debug\DesignTimeResolveAssemblyReferences.cache
............此处省略5个文件信息