C++导出函数定义：

 LONG  Test::Test(String  ^c1,String  ^c2,String  ^c3)
  {
   using namespace Runtime::InteropServices;
   char* chars = (char*)(Marshal::StringToHGlobalAnsi(c1)).ToPointer();
   char* chars1 = (char*)(Marshal::StringToHGlobalAnsi(c2)).ToPointer();
   char* chars2 = (char*)(Marshal::StringToHGlobalAnsi(c3)).ToPointer();
   return ::Init(chars, wDVRPort,chars1, chars2);
   //Marshal::FreeHGlobal(IntPtr((void*)chars));
   //Marshal::FreeHGlobal(IntPtr((void*)chars1));
   //Marshal::FreeHGlobal(IntPtr((void*)chars2));
  }

C#使用

  Test   tc=new Test();

   tc.Test("aaa","bbbbbb","ccccccc");

 

  这里有个问题，就是关于释放，就是注释掉的部分。