如何导出宏函数并在项目 .exe 中使用它

Question

I have a dll project (Server.dll) containing a Server.cpp

Server.cpp

#include "pch.h"
#include "Server.hpp"
extern "C" {
_declspec(dllexport) int Server::Add(int a, int b)
{
return a + b;
}
}
#define Function(  Y )  \
\
extern "C" __declspec( dllexport)\
std::string Server::Y(std::string const& name) {\
return name; \
}\

I use these two functions in an other project client.exe

Here the main

#include <Windows.h>
#include <iostream>
typedef int(*pAdd) (int a, int b);
int main()
{
std::string path = "D:\\project\\Server.dll";
std::wstring stemp = std::wstring(path.begin(), path.end());
LPCWSTR sw = stemp.c_str();
HINSTANCE hinstance = LoadLibrary(sw);
if(!hinstance)
std::cout << "canot load library\n";
pAdd obj = (pAdd)GetProcAddress(hinstance, "Add");
if (obj) {
int result = obj(10, 20);
std::cout << "result = " << result << std::endl;
}
std::string func = "Client";
std::cout << "address = " << GetProcAddress(hinstance, "Y");
}

i can load Add function but i can't load Y function (address = 0000000000)

Any suggestions please ?

Answer 1

I want to post an example of the solution here maybe someone needs one day to create a macro function containing a function:

I have a dll project containing a class:

Here the code

#include "pch.h" 
#include <iostream>
#define Function(  Y )  \
\
extern "C" __declspec( dllexport)\
int Y(int a, int b) {\
return (a+b); \
}\
class TestMacro {
Function(Add);
};

In another exe project i loaded this function and use it here the code:

#include <Windows.h>
#include <iostream>
typedef int(*Y)(int a, int b);
int main()
{
std::string path = "D:\\project\\Server.dll";
std::wstring stemp = std::wstring(path.begin(), path.end());
LPCWSTR sw = stemp.c_str();
HINSTANCE hinstance = LoadLibrary(sw);
if(!hinstance)
std::cout << "canot load library\n";
std::cout << "address = " << GetProcAddress(hinstance, "Add")<< std::endl;
Y y = (Y)GetProcAddress(hinstance, "Add");
int result = y(2,3);
std::cout << "appel Y = " << result<< std::endl;
}

Here the ouput

address = 00007FFBF98C132F
appel Y = 5