用c写的一个简单的dll例子在win32汇编中调用

#define MYDLL_EXPORTS
#include "DLL3.h"
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
return TRUE;
}

int CALLBACK MySum(int a,int b)
{
return a+b;
}

#ifdef MYDLL_EXPORTS
#define MYDLL_API __declspec(dllexport)
#else
#define MYDLL_API __declspec(dllimport)
#endif
#include <windows.h>
extern "C" MYDLL_API int CALLBACK MySum(int a,int b);/////加上extern "C"