C#调用C++文件

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一、C#调用C++ dll文件

1）非托管方式：

C++函数定义：

extern "C" __declspec(dllexport)void MyChangeDetection(const char * filepath1,const char *filepath2,int DImethod,int DIAnalysis,const char *outpath)
{
    ......
}

C#中，函数声明部分：

        [DllImport("CDdll.dll",CharSet=CharSet.Ansi,CallingConvention=CallingConvention.Cdecl)]  //,CharSet=CharSet.Ansi

        public static extern void MyChangeDetection(IntPtr filepath1, IntPtr filepath2, int DImethod, int DIAnalysis, IntPtr outpath);

函数使用部分：

MyChangeDetection(Intptr1, Intptr2, Dimethod1, DiAnalysismethod2, Intptr3);

注意C++与C#中类型转换：

public string pathname1, pathname2;
public string Dimethod, DiAnalysismethod;

public string outPath = Directory.GetCurrentDirectory()+"\\"+"CDmap.png";

private void button1_Click(object sender, EventArgs e)
       {
           OpenFileDialog file = new OpenFileDialog();
           file.InitialDirectory = ".";
           file.Filter = "所有文件(*.*)|*.*";
           file.ShowDialog();
           if (file.FileName != string.Empty)
           {
               try
               {
                    pathname1 = file.FileName;   //点击获取图片路径
                    this.pictureBox1.Load(pathname1);
                  //  pictureBox1.Image.Dispose();

               }
               catch(Exception ex)
               {
                   MessageBox.Show(ex.Message);

                }

            }

        }

IntPtr Intptr1 = Marshal.StringToHGlobalAnsi(pathname1);   //string  ->IntPtr
IntPtr Intptr2 = Marshal.StringToHGlobalAnsi(pathname2);
IntPtr Intptr3 = Marshal.StringToHGlobalAnsi(outPath);
MyChangeDetection(Intptr1, Intptr2, Dimethod1, DiAnalysismethod2, Intptr3);

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2）托管方式：

https://www.cnblogs.com/GIScore/p/5872565.html

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二、C#调用C++ .exe文件

（1）C++文件正常写，，需要传递参数部分：

#include"header.h"

int main(int argc, char * argv[])
{
    const char* filepath1 = argv[1];
    const char* filepath2 = argv[2];
    int DImethod = atoi(argv[3]);
    int DIAnalysismethod = atoi(argv[4]);
    const char* filepath3 = argv[5];

    Mat img1 = imread(filepath1,0);
    Mat img2 = imread(filepath2, 0);
    ...

    return 0;

}

在调试C++代码的过程中，，可以在 项目属性->配置属性->调试->命令参数
在命令参数里面输入 参数

（2） C#文件：
C#调用的地方：

public string exepath = "M:\\MyCD\\CDWindow\\x64\\Debug\\CDexe.exe";

string args = string.Format("{0} {1} {2} {3} {4} ", pathname1, pathname2, Dimethod1, DiAnalysismethod2, outPath);
//args = args.Replace("\\", "/");
//  StartCallbackProcess(@"M:\CDWindow\x64\Debug\CDexe.exe", args);
//StartCallbackProcess(@"M:\MyCD\CDWindow\x64\Debug\CDexe.exe", args);            
StartCallbackProcess(exepath, args);

StartCallbackProcess（）函数定义如下：

private void StartCallbackProcess(string exe_file, string save_fp, string dat_fp, string out_fp)
  {
      throw new NotImplementedException();
  }
//  int returnValue;

        private void StartCallbackProcess(string exefilename, string arg)
        {
            //  string save_fp = saveText.Text;
            try
            {
                using (Process myprocess = new Process())
                {
                    Control.CheckForIllegalCrossThreadCalls = false;
                    ProcessStartInfo myProcessStartInfo = new ProcessStartInfo(exefilename, arg) { WindowStyle = ProcessWindowStyle.Hidden };
                    myprocess.StartInfo = myProcessStartInfo;
                    myprocess.StartInfo.UseShellExecute = false;
                    myProcessStartInfo.RedirectStandardInput = true;
                    myProcessStartInfo.RedirectStandardOutput = true;
                    myprocess.StartInfo.CreateNoWindow = true;

                    //myProcessStartInfo.WindowStyle = ProcessWindowStyle.Hidden;

                    myprocess.OutputDataReceived += new DataReceivedEventHandler(myprocess_OutputDataReceived);   //接收cmd数据
                    myprocess.Start();
                    myprocess.StandardInput.WriteLine(textBox1.Text);
                    myprocess.BeginOutputReadLine();

                    while (!myprocess.HasExited)
                    {
                        myprocess.WaitForExit();
                    }
                   // returnValue = myprocess.ExitCode;
                }

                //if (returnValue == 1)
                //{
                //    MessageBox.Show("变化检测已完成！");
                //}
                //else
                //{
                //    MessageBox.Show("变化检测失败！");
                //}

            }
            catch (Exception ex)
            {
                MessageBox.Show("启动应用程序出错！原因：" + ex.Message);
            }

        }

myprocess_OutputDataReceived（）函数定义如下：
该函数实现将cmd数据实时地显示在textBox1上

private void myprocess_OutputDataReceived(object sender, DataReceivedEventArgs outLine)
        {
           // this.BeginInvoke(new Action(() => { textBox1.Text += "\r\n" + outLine.Data; }));

            if (!String.IsNullOrEmpty(outLine.Data))
            {
                StringBuilder sb = new StringBuilder(this.textBox1.Text);
                this.textBox1.Text = sb.AppendLine(outLine.Data).ToString();
                this.textBox1.SelectionStart = this.textBox1.Text.Length;
                this.textBox1.ScrollToCaret();
            }
        }