C++ DLL导出的两种方式和链接的两种方式

野性酷女 2021-10-24 02:54 516阅读 0赞

**第一种 导出方式**

extern "C" _declspec(dllexport) int Plus(int x, int y);
    extern "C" _declspec(dllexport) int Sub(int x, int y);
    extern "C" _declspec(dllexport) int Mul(int x, int y);
    extern "C" _declspec(dllexport) int Div(int x, int y);
    
    int Plus(int x, int y)
    {
        return x + y;
    }
    
    int Sub(int x, int y)
    {
        return x - y;
    }
    
    int Mul(int x, int y)
    {
        return x * y;
    }
    
    int Div(int x, int y)
    {
        return x / y;
    }

**第二种 导出方式**

在项目上添加一个def文件

// def文件里面
    EXPORTS
    Plus @12
    Sub @17
    Mul @15 NONAME   // (此种方式只导出序号)
    Div @16

// CPP文件里面
    int Plus(int x, int y)
    {
        return x + y;
    }
    
    int Sub(int x, int y)
    {
        return x - y;
    }
    
    int Mul(int x, int y)
    {
        return x * y;
    }
    
    int Div(int x, int y)
    {
        return x / y;
    }

**DLL使用**

**第一种 隐式链接**

// 先把TestDll.lib 和 TestDll.dll放在main.cpp 同一目录下
    #include <stdio.h>
    #pragma comment(lib, "TestDll.lib")
    
    extern "C" _declspec(dllimport) int Plus(int x, int y);
    extern "C" _declspec(dllimport) int Sub(int x, int y);
    extern "C" _declspec(dllimport) int Mul(int x, int y);
    extern "C" _declspec(dllimport) int Div(int x, int y);
    
    int main()
    {
        int d = Plus(2, 3);
        printf("%d", d);
        getchar();
        return 0;
    }

**第二种 显示链接**

#include <stdio.h>
    #include <windows.h>
    
    int main()
    {
        // 定义函数指针
        typedef int(*lpPlus)(int, int);
        typedef int(*lpSub)(int, int);
        typedef int(*lpMul)(int, int);
        typedef int(*lpDiv)(int, int);
        // 获取模块句柄
        HMODULE hMoudle = LoadLibrary(L"TestDll.dll");
        // 获取函数地址
        lpPlus MyPlus = (lpPlus)GetProcAddress(hMoudle, "Plus");
        lpSub MySub = (lpSub)GetProcAddress(hMoudle, "Sub");
        lpMul MyMul = (lpMul)GetProcAddress(hMoudle, "Mul");
        lpDiv Mydiv = (lpDiv)GetProcAddress(hMoudle, "Div");
        // 调用
        int d = MyPlus(2, 3);
        printf("%d", d);
        getchar();
        return 0;
    }

转载于:https://www.cnblogs.com/duxie/p/10859314.html