XiYuJing|文章:Qt实现的电子相册

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Qt实现的电子相册

发布时间：2024年12月09日 作者：靖华来源：XiYuJing

项目代码

#Qt实现的电子相册
##效果图
![](http://www.xiyujing.com/media/article_img/QQ20241209-170817.png)
###project.pro
```cpp
#-------------------------------------------------
#
# Project created by QtCreator 2024-12-09T12:12:29
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = untitled1
TEMPLATE = app

# 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 += \
        main.cpp \
        mainwindow.cpp

HEADERS += \
        mainwindow.h

FORMS += \
        mainwindow.ui

```

###mainwindow.h
```cpp
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private slots:
    void on_pushButton_clicked();

void on_pushButton_2_clicked();

void on_pushButton_3_clicked();

private:
    Ui::MainWindow *ui;
    //选择的文件夹路径
    QString mFolderPath;
    //文件夹内文件名
    QStringList mImgNames;
    //图片名称
    QString  filename;
    int i=0;
};

#endif // MAINWINDOW_H

```

###main.cpp
```cpp
#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

return a.exec();
}

```

###mainwindow.cpp
```cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QFileDialog>//用于提供文件和目录选择的对话框，方便用户在应用程序中选择文件或目录
#include<QDebug>//用于调试输出
#include<QPixmap>//用于处理图像数据
#include<QDir>//用于操作文件系统的目录和文件

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //上下按钮初始为不可用
    ui->pushButton_2->setEnabled(false);
    ui->pushButton_3->setEnabled(false);
    //设置内容自动缩放
    ui->label->setScaledContents(true);
}

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

void MainWindow::on_pushButton_clicked()
{
    //上下按钮初始为不可用
    ui->pushButton_2->setEnabled(false);
    ui->pushButton_3->setEnabled(false);
    //初始化
    i=0;
    //选择文件夹
    mFolderPath = QFileDialog::getExistingDirectory(NULL,"Open folderr","/");
    //没选择直接返回
    if(mFolderPath.isEmpty())return ;
    QDir dir(mFolderPath);
    //将文件分隔符转换为当前操作系统分隔符
    mFolderPath = dir.fromNativeSeparators(mFolderPath);
    //如果文件夹不存在设置为空链表
    if(!dir.exists())mImgNames=QStringList("");
    //设置 QDir 的过滤器，只显示文件。
    dir.setFilter(QDir::Files);
    //按照文件名进行排序。
    dir.setSorting(QDir::Name);
    //设置文件名过滤器，只显示 *.png、*.xpm、*.jpg 和 *.bmp 格式的文件。
    dir.setNameFilters(QString("*.png;*.xpm;*.jpg;*.bmp").split(";"));
    //获取符合过滤条件的文件列表，并将其存储在 mImgNames 中。
    mImgNames = dir.entryList();
    //使能上下按钮
    ui->pushButton_2->setEnabled(true);
    ui->pushButton_3->setEnabled(true);
    //拼接路径
    filename = mFolderPath+"/"+mImgNames[i];
    //利用这个路径打开图片并且显示
    ui->label->setPixmap( QPixmap {filename} );
}

void MainWindow::on_pushButton_2_clicked()
{
    if(i-1==-1)i=mImgNames.size()-1;
    else --i;
    filename = mFolderPath+"/"+mImgNames[i];
    qDebug()<<filename;
    //利用这个路径打开图片并且显示
    ui->label->setPixmap( QPixmap {filename} );
}

void MainWindow::on_pushButton_3_clicked()
{
    if(i+1==mImgNames.size())i=0;
    else ++i;
    filename = mFolderPath+"/"+mImgNames[i];
    qDebug()<<filename;
    //利用这个路径打开图片并且显示
    ui->label->setPixmap( QPixmap {filename} );
}
```

###mainwindow.ui
```cpp
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>480</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralWidget">
   <widget class="QPushButton" name="pushButton">
    <property name="geometry">
     <rect>
      <x>630</x>
      <y>10</y>
      <width>150</width>
      <height>71</height>
     </rect>
    </property>
    <property name="text">
     <string>选择文件夹</string>
    </property>
   </widget>
   <widget class="QPushButton" name="pushButton_2">
    <property name="enabled">
     <bool>false</bool>
    </property>
    <property name="geometry">
     <rect>
      <x>630</x>
      <y>180</y>
      <width>150</width>
      <height>71</height>
     </rect>
    </property>
    <property name="text">
     <string>上一个</string>
    </property>
   </widget>
   <widget class="QPushButton" name="pushButton_3">
    <property name="enabled">
     <bool>false</bool>
    </property>
    <property name="geometry">
     <rect>
      <x>630</x>
      <y>350</y>
      <width>150</width>
      <height>71</height>
     </rect>
    </property>
    <property name="text">
     <string>下一个</string>
    </property>
   </widget>
   <widget class="QLabel" name="label">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>10</y>
      <width>601</width>
      <height>441</height>
     </rect>
    </property>
    <property name="frameShape">
     <enum>QFrame::Box</enum>
    </property>
    <property name="text">
     <string/>
    </property>
   </widget>
  </widget>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>
```

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