Qt dll的导出与调用

Qt中动态链接库（dll）的导出

testdll_global.h

#ifndef TESTDLL_GLOBAL_H#define TESTDLL_GLOBAL_H#include <QtCore/qglobal.h>#if defined(TESTDLL_LIBRARY)#  define TESTDLLSHARED_EXPORT Q_DECL_EXPORT#else#  define TESTDLLSHARED_EXPORT Q_DECL_IMPORT#endif#endif // TESTDLL_GLOBAL_H

testdll.h

#ifndef TESTDLL_H

#define TESTDLL_H

#include <QDebug>

#include "testdll_global.h"

class TESTDLLSHARED_EXPORT Testdll

{

public:

    Testdll();

public:

    static void add( int a1, int a2 );

    static void sub( int s1, int s2 );

};

extern "c" TESTDLLSHARED_EXPORT void mul( int m1, int m2 );

#endif // TESTDLL_H

testdll.cpp

#include "testdll.h"Testdll::Testdll(){}void Testdll::add(int a1, int a2){    qDebug()<<"a1+a2="<<a1+a2;}void Testdll::sub(int s1, int s2){    qDebug()<<"s1-s2="<<s1-s2;}void mul(int m1, int m2){    qDebug()<<"m1*m2="<<m1*m2;}

编译后生成 lib文件和dll文件

dll文件的隐式调用

1 需要在调用程序中引入 testdll.h文件

2 需要导入testdll.lib文件 #pragma comment(lib, "testdll.lib")

        

#include <QCoreApplication>#include "./lib/testdll_global.h"#include "./lib/testdll.h"#include <QLibrary>#pragma comment(lib, "./lib/testdll.lib")TESTDLLSHARED_EXPORT void mul( int, int);int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    Testdll::add( 3, 5 );    Testdll::sub( 5, 2 );    mul( 2, 7);    return a.exec();}