linux

动态的头文件api.h

#ifndef _API_H#define _API_H#ifdef DLL_IMPLEMENT#define DLL_EXPORT extern "C"#else#define DLL_EXPORT#endifDLL_EXPORT int mysum(int a, int b);#endif // _API_H

动态库的源文件api.cpp

#define DLL_IMPLEMENT#include "api.h"#include 
     
      DLL_EXPORT int mysum(int a, int b){    std::cout << "This (mysum) is a c++ function." << std::endl;    return a + b;}
     

调用动态库的测试代码main.c

#include 
     
      #include "api.h"int main(){    int sum = mysum(8, 3);    printf("The sum is %d\n", sum);}
     

下面在命令行测试：

g++ -shared -fPIC -o libmyapi.so api.cpp    #生成动态库gcc main.c -o a.out -L. -lmyapi    #链接动态库生成执行文件ln -s /path/to/libmyapi.so /usr/lib/libmyapi.so    #在系统的动态库搜索路径建立软连接ldconfig    #让系统重新搜索一遍动态库./a.out    #执行，下面是输出     This (mysum) is a c++ function.     The sum is 11

windows

动态的头文件api.h

#ifndef _API_H#define _API_H#ifdef DLL_IMPLEMENT#define DLL_EXPORT extern "C" __declspec(dllexport)#else#define DLL_EXPORT extern "C" __declspec(dllimport)#endif#define MYAPI __stdcallDLL_EXPORT int MYAPI mysum(int a, int b);#endif // _API_H

动态库的源文件api.cpp

#define DLL_IMPLEMENT#include "api.h"#include 
     
      int MYAPI mysum(int a, int b){    std::cout << "This (mysum) is a c++ function." << std::endl;    return a + b;}
     

调用动态库的测试代码main.c

#include 
     
      #include "api.h"#pragma comment(lib, "./myapi.lib")int main(){    int sum = mysum(8, 3);    printf("The sum is %d\n", sum);}
     

windows在visual studio中测试即可

 

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