.net下通过委托调用c++ 的dll文件中的回调函数

定义DLL相关的方法： typedef void(__stdcall * ptest)(char *,char *); /*注意此处必须是__stdcall，该方法在.net中实现的，涉及到夸语言调用，此处必须是__stdcall，否则会出现Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.*/ static ptest cdlltest = NULL; extern "C" __declspec(dllexport) void setptest(ptest notiGISSta) { cdlltest = notiGISSta; } extern "C" __declspec(dllexport) void getdatefromdll(char * pc) { char str[2048] = { 0 }; char str1[2048] = { 0 }; sprintf_s(str, 2048, "{\"sender\":\"%s\"," "\"latitude\":\"%s\"," "\"longitude\":\"%s\"}" , pc, pc, pc); sprintf_s(str1, 2048, "{\"a\":\"%s\"," "\"b\":\"%s\"," "\"c\":\"%s\"}" , pc, pc, pc); cdlltest(str, str1); } .net调用： void ShowDllString(string cString, string cStringb) { string vc = cString + cStringb; MessageBox.Show(vc); //return cString; } private void button1_Click(object sender, EventArgs e) { DllDelegate stringDelegate = new DllDelegate(ShowDllString); setcallback(stringDelegate); paddsd("2017-07-10"); }