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整个工程由一个主程序构成和一个模块构成(dll)。整个工程的结构目录如下 Define.priMyProject.proMyProject.pro.user
---bin
---MainProgrammain.cppMainProgram.proMainProgram.pro.userwidget.cppwidget.hwidget.ui
---MathDllMathDll.proMathDll.pro.userMyMath.…项目结构
整个工程由一个主程序构成和一个模块构成(dll)。整个工程的结构目录如下 Define.priMyProject.proMyProject.pro.user
---bin
---MainProgrammain.cppMainProgram.proMainProgram.pro.userwidget.cppwidget.hwidget.ui
---MathDllMathDll.proMathDll.pro.userMyMath.cppMyMath.hqmake文件介绍
1 MyProject.pro
TEMPLATE subdirs #多工程项目
CONFIG ordered #指定编译顺序
SUBDIRS MathDll \ #模块dllMainProgram #主工程2 Define.pri
win32 {CONFIG(release, debug|release){contains(QT_ARCH, i386) {BIN_PATHrelease_x86_} else {BIN_PATHrelease_x64_}} else {contains(QT_ARCH, i386) {BIN_PATHdebug_x86_} else {BIN_PATHdebug_x64_}}
}DESTDIR $$PWD/bin/$$BIN_PATH #生成的二进制文件可执行文件或者库的目标位置放在pri文件中在有pro文件包含这样就不用重复写
3 MathDll.pro
QT - guiTEMPLATE libCONFIG c11# The following define makes your compiler emit warnings if you use
# any Qt feature that has 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
DEFINES MATHDLL_LIBRARY #使用预定义来控制是导出函数符号到dll还是导出dll中的函数符号# You can also make your code fail to compile if it uses 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_BEFORE0x060000 # disables all the APIs deprecated before Qt 6.0.0include($$PWD/../Define.pri) #引入pri文件SOURCES \MyMath.cpp \MyMath.h
#拷贝头文件到指定目录以便其它程序能够使用该dll
QMAKE_POST_LINK xcopy /y/F \$$PWD/MyMath.h\ \$$PWD/../bin/includePath\\\ $$escape_expand(\\n\\t)# Default rules for deployment.
qnx: target.path /tmp/$${TARGET}/bin
else: unix:!android: target.path /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS target4 MainProgram.pro
#-------------------------------------------------
#
# Project created by QtCreator 2023-12-09T17:29:33
#
#-------------------------------------------------QT core guigreaterThan(QT_MAJOR_VERSION, 4): QT widgetsTARGET MainProgram
TEMPLATE app# The following define makes your compiler emit warnings if you use
# any feature of Qt which has 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_BEFORE0x060000 # disables all the APIs deprecated before Qt 6.0.0include($$PWD/../Define.pri) #引入pri文件
LIBS -L$$PWD/../bin/$$BIN_PATH #设置搜索链接动态库的目录CONFIG c11INCLUDEPATH $$PWD/../bin/includePath #设置搜索头文件目录
LIBS -lMathDll #链接库文件SOURCES \main.cpp \widget.cppHEADERS \widget.hFORMS \widget.ui# Default rules for deployment.
qnx: target.path /tmp/$${TARGET}/bin
else: unix:!android: target.path /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS target
注意 :
LIBS -L$$PWD/../bin/$$BIN_PATH这句话是很重要的在程序编译链接时会使用到动态库的 lib 文件用于生成程序。而默认链接的位置是 MainProgram 目录下如果没有该语句就会提示找不到 MathDll.lib 文件可执行程序生成失败。
源文件分析
1 MyMath.h
#ifndef MYMATH_H_
#define MYMATH_H_
//包含QObject才能识别 Q_DECL_EXPORT Q_DECL_IMPORT
#include QObject
//预定义来控制导入导出符号
#if defined (MATHDLL_LIBRARY)
#define MATHDLL_LIBRRY_EXPORT Q_DECL_EXPORT
#else
#define MATHDLL_LIBRRY_EXPORT Q_DECL_IMPORT
#endifclass MATHDLL_LIBRRY_EXPORT MyMath{
public:MyMath();~MyMath();int add(int a, int b);
};#endif2 widget.cpp
#include widget.h
#include ui_widget.h
#include MyMath.hWidget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget)
{ui-setupUi(this);
}Widget::~Widget()
{delete ui;
}void Widget::on_pushButton_clicked()
{int a ui-lineEdit-text().toInt();int b ui-lineEdit_2-text().toInt();MyMath myMath;int sum myMath.add(a, b); //使用动态链接库中的函数ui-label-setText(ui-label-text() QString::number(sum));
}
效果
