Can not import static library with c++

Question

Hey guys,

I'm new c++ developer.
I want to build custom static library by my self.
I built success static lib c++ visual code
Now I want to import my static lib to other c++ code in visual studio code. But it not work
Here is my code:

#visual code: build success : mylib.lib

#Visual studio code

Answer 1

Hi,

The format .lib are compiled with visual studio: you can't use it simply in g++.

Below is my test sample and I build the dll in x86:
MSVC DLL:

#pragma once
#include <iostream>

#ifdef MSVC_EXPORTS
#define API __declspec(dllexport)
#else
#define API __declspec(dllimport)
#endif

extern "C" API  void HelloWorld();

cpp:
#include"Header.h"
void HelloWorld()
{
    std::cout << "Hello, World!" << std::endl;
}

main.cpp

#include <windows.h>
#include <iostream>
#include"../.../Header.h"


typedef void (*HelloWorldFunc)();

int main() {
  
    HMODULE hDll = LoadLibraryA("mylib.dll");//Put the dll and cpp in the same folder
    if (hDll != NULL) {
     
        HelloWorldFunc helloWorld = reinterpret_cast<HelloWorldFunc>(GetProcAddress(hDll, "HelloWorld"));
        if (helloWorld != nullptr) {
           
            helloWorld();
        }
        else {
            std::cout << "Failed to retrieve function address." << std::endl;
        }
        getchar();
       
        FreeLibrary(hDll);
    }
    else {
        std::cout << "Failed to load the DLL." << std::endl;
    }

    return 0;
}

And g++ command:g++ main.cpp

Best regards,

Minxin Yu

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Answer 2

I try with your suggest, without -L... -l
When I run build , I got new error not found file hello.h (see image attached)

I try with your suggest, without -L... -l
When I run build , I got new error not found file hello.h (see image attached)