C++生成DLL给C#调用

1、添加C++动态链接库（DLL）

2、添加头文件 test.h

?

1 2 3 4 5 6 7 8 9 10

#ifndef TEST_H #define TEST_H   // 添加要在此处预编译的标头 #include "framework.h"   #endif //TEST_H     extern "C" _declspec(dllexport) int  GetTxtStr(char* in_str, char* out_str);

2、添加cpp文件 test.cpp

int GetTextStr(char* in_str,char* out_str){
          char buff[1024];
          memset(buff, 0, sizeof(buff));
          char *test = "test"
           
           strcpy(instr,buff);
           strcat(buff,test2);
          
           strcpy(out_str,buff);

          return TRUE
           
}

3、在C#项目里如下

?

1 2 3 4 5 6 7 8 9 10 11 12

[DllImport("test.dll", EntryPoint = "GetTextStr", CallingConvention = CallingConvention.Cdecl)]   static extern int GetTextStr(string in_str, [MarshalAs(UnmanagedType.LPStr)] StringBuilder out_str);     static void Main(string[] args)   {       StringBuilder str = StringBuilder();         GetTextStr("123456", str);         Console.WriteLine(str);     }