QT 创建静态动态库和使用动态库

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本文详细介绍如何在Qt Creator中创建静态和动态库，包括配置、编译过程及在项目中使用的方法。通过实例演示了如何定义和实现库中的函数接口，以及在控制台应用程序中调用这些接口。

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1. 创建静态动态库

1.1类型选择"静态链接库"

剩余的操作使用默认设置即可。

1.2 创建完成后，添加接口,因为是静态链接库，所以我们不需要导出接口，使用时只需要包含头文件即可使用

目录结构

Library.pro

#-------------------------------------------------
#
# Project created by QtCreator 2019-08-21T17:10:12
#
#-------------------------------------------------

QT       -= gui

TARGET = Library
TEMPLATE = lib
CONFIG += staticlib

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += library.cpp

HEADERS += library.h
unix {
    target.path = /usr/lib
    INSTALLS += target
}

library.h

#ifndef LIBRARY_H
#define LIBRARY_H

//函数接口
double Divide(int a,int b);
class Library
{

public:
    Library();
    //类静态成员函数接口
    static int Add(int a,int b);
    static int Del(int a,int b);
    //类成员函数接口
    int Multi(int a ,int b);
};

#endif // LIBRARY_H

library.cpp

#include "library.h"


Library::Library()
{
}

int Library::Add(int a, int b)
{
    return a+b;
}

int Library::Del(int a, int b)
{
    return a - b;
}

int Library::Multi(int a, int b)
{
    return a*b;
}

double Divide(int a,int b)
{
    return (double)a/(double)b;
}

1.3 编译完成后，在输出目录下，liblibrary.a即为静态库，使用msvc编译位lib文件

2. 使用动态库

2.1 创建控制台程序

2.2 将静态库文件copy到指定目录下，并设置路径。

dlltest.pro

QT += core
QT -= gui

CONFIG += c++11

TARGET = dlltest
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

#HEADERS += $$PWD/Library/include/library.h
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
LIBS += $$PWD/Library/lib/libLibrary.a

main.cpp

#include <QCoreApplication>
#include <QDebug>
#include "Library/include/library.h"
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    int num1 = 10;
    int num2 = 3;
    qDebug()<<"静态成员函数1接口"<<Library::Add(num1,num2);
    qDebug()<<"静态成员函数2接口"<<Library::Del(num1,num2);
    Library lib;
    qDebug()<<"普通成员函数接口"<<lib.Multi(num1,num2);
    qDebug()<<"普通函数接口"<<Divide(num1,num2);
    return a.exec();
}

2.3 编译完成后，不需要copy动态库，即可运行