Qt调用dll中的功能函数demo

#include <QCoreApplication> #include <iostream> #include <QLibrary> typedef int (*Fun)(int,int); //定义函数指针,int add(int a,int b); int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QLibrary mylib("TestDll.dll"); //声明所用到的dll文件 int result; //判断是否正确加载 if (mylib.load()) { std::cout << "DLL load is OK!"<<std::endl; //调用外部函数 add() Fun add = (Fun)mylib.resolve("add"); //是否成功连接上 add() 函数 if (add) { std::cout << "Link to add Function is OK!"<<std::endl; //这里函数指针调用dll中的 add() 函数 result = add(5,6); std::cout << result; } else std::cout << "Link to add Function failed!!"<<std::endl; } //加载失败 else std::cout << "DLL is not loaded!"<<std::endl; return a.exec(); }