四十四、Qt之将带界面的程序封装成dll-CFANZ编程社区

1.修改配置文件

#TEMPLATE = app

DEFINES += CUSTOMMESSAGEBOX_LIBRARY
TEMPLATE = lib

2.在导出类的头文件上加如下代码

#if defined(CUSTOMMESSAGEBOX_LIBRARY)
#  define CUSTOMMESSAGEBOXSHARED_EXPORT Q_DECL_EXPORT
#else
#  define CUSTOMMESSAGEBOXSHARED_EXPORT Q_DECL_IMPORT
#endif

3.修改导出类定义

//class CustomMessageBox : public QDialog
class CUSTOMMESSAGEBOXSHARED_EXPORT CustomMessageBox : public QDialog

4.编译

若是 MinGW32 编译器，在编译之后会在文件夹下找到 ***.dll 和 ***.a 文件；若是 MSVC 编译器，则应该是 ***.dll 和 ***.lib。

5.使用

在使用该库的程序中，新建一个 include 文件夹，将 ***.a 文件和 导出类的头文件 复制进这个文件夹，在程序中引入该头文件即可。在编译之后，将不同模式编译下的 dll 文件放入程序编译后的文件夹中，才能正常运行程序。

6.简单案例

custommessagebox.pro

#-------------------------------------------------
#
# Project created by QtCreator 2020-03-07T22:37:05
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = custommessagebox
#TEMPLATE = app

DEFINES += CUSTOMMESSAGEBOX_LIBRARY
TEMPLATE = lib

# 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 += \
        custommessagebox.cpp \
#        main.cpp

HEADERS += \
        custommessagebox.h

FORMS += \
        custommessagebox.ui

RESOURCES += \
    resources.qrc

custommessagebox.h

#ifndef CUSTOMMESSAGEBOX_H
#define CUSTOMMESSAGEBOX_H

#if defined(CUSTOMMESSAGEBOX_LIBRARY)
#  define CUSTOMMESSAGEBOXSHARED_EXPORT Q_DECL_EXPORT
#else
#  define CUSTOMMESSAGEBOXSHARED_EXPORT Q_DECL_IMPORT
#endif

#include <QDialog>

namespace Ui {
class CustomMessageBox;
}

//class CustomMessageBox : public QDialog
class CUSTOMMESSAGEBOXSHARED_EXPORT CustomMessageBox : public QDialog
{
    Q_OBJECT

public:
    explicit CustomMessageBox(QWidget *parent = 0);
    ~CustomMessageBox();

    void setMessage(const QString msg, int type);

    void test();

private slots:
    void on_btnOk_clicked();

private:
    Ui::CustomMessageBox *ui;

    void initStyle(); //初始化无边框窗体

    void moveFormToCenter(); //窗体居中显示
};

#endif // CUSTOMMESSAGEBOX_H

custommessagebox.cpp

#include "custommessagebox.h"
#include "ui_custommessagebox.h"

#include <QDesktopWidget>
#include <QDebug>

CustomMessageBox::CustomMessageBox(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::CustomMessageBox)
{
    ui->setupUi(this);
    this->initStyle();
    this->moveFormToCenter();
}

CustomMessageBox::~CustomMessageBox()
{
    delete ui;
}

void CustomMessageBox::setMessage(const QString msg, int type)
{
    switch (type) {
        case 1:
        {
            ui->labIcoMain->setStyleSheet("border-image: url(:/images/image/msg_question.png);");
            ui->lab_Title->setText("询问");
            break;
        }
        case 2:
        {
            ui->labIcoMain->setStyleSheet("border-image: url(:/images/image/msg_error.png);");
            ui->btnCancel->setVisible(false);
            ui->lab_Title->setText("错误");
            break;
        }
        default:
        {
            ui->labIcoMain->setStyleSheet("border-image: url(:/images/image/msg_info.png);");
            ui->btnCancel->setVisible(false);
            ui->lab_Title->setText("提示");
            break;
        }
    }
    ui->labInfo->setText(msg);
    this->setWindowTitle(ui->lab_Title->text());
}

void CustomMessageBox::test()
{
    qDebug() << "测试是否可以输出";
}

void CustomMessageBox::initStyle()
{
    QFont localFont = this->font();
    localFont.setPointSize(10);
    localFont.setFamily("Microsoft YaHei");
    this->setFont(localFont);
    this->setWindowTitle(ui->lab_Title->text());
    //设置窗体标题栏隐藏
    this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowSystemMenuHint | Qt::WindowMinimizeButtonHint);
    //设置图标
    ui->lab_Ico->setStyleSheet("border-image: url(:/images/image/home.png);");
    ui->btnMenu_Close->setIcon(this->style()->standardIcon(QStyle::SP_TitleBarCloseButton));
    //关联关闭按钮
    connect(ui->btnMenu_Close, SIGNAL(clicked()), this, SLOT(close()));
    connect(ui->btnCancel, SIGNAL(clicked()), this, SLOT(close()));
}

void CustomMessageBox::moveFormToCenter()
{
    int width = this->width();
    int height = this->height();
    QDesktopWidget dwt;
    int deskWidth = dwt.availableGeometry().width();
    int deskHeight = dwt.availableGeometry().height();
    QPoint movePoint(deskWidth / 2 - width / 2, deskHeight / 2 - height / 2);
    this->move(movePoint);
}

void CustomMessageBox::on_btnOk_clicked()
{
    done(1);
    this->close();
}

custommessagebox.ui

省略

调用

void Widget::on_btnMeesageBox_clicked()
{
    CustomMessageBox messageBox;
    messageBox.setMessage("调用成功", 1);
    messageBox.exec();
}