QT 开发的必应 壁纸，图片，批量下载图片的程序

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QTextCodec> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); //setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint); setWindowOpacity(1.0); setAttribute(Qt::WA_TranslucentBackground); //QString appDirPath = ""; #if defined(Q_OS_LINUX) appDirPath = qApp->applicationDirPath() + "/"; #endif connect(this, SIGNAL(urlFound(QString,QString)), this, SLOT(downloadFileFromUrl(QString,QString))); // connect(this, SIGNAL(picSaved(QString)), &todaysPic, SLOT(preview(QString))); } MainWindow::~MainWindow() { delete ui; } /* * Getting "http://cn.bing.com/" * Turn to function "findPicUrl()" to read the reply when SIGNAL "finished" arrives. */ void MainWindow::getWholeWebSource() { QUrl url("https://bing.ioliu.cn/?p=1"); ui->textEdit->insertPlainText("打开网页."); QNetworkRequest request; request.setUrl(url); connect(&manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(findPicUrl(QNetworkReply*))); manager.get(request);//用finished信号传递reply } /* * disconnect信号与槽 * 读取已完成的全部reply * 搜索关键字符串，找到完整的目标url，即指向壁纸图片的url * emit the SIGNAL: "urlFound", connected with the SLOT: "downloadPic" */ void MainWindow::findPicUrl(QNetworkReply *reply) { //心跳 时钟开始 disconnect(&manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(findPicUrl(QNetworkReply*))); if(reply->error() == QNetworkReply::NoError) { QByteArray webContent = reply->readAll(); /*** 存到文件方便查找问题。 QFile file("测试文件.txt");//写成一个可阅读的txt文档，用于程序测试 file.open(QIODevice::ReadWrite); file.write(webContent); file.close(); ***/ QByteArray targetUrl = "https://bing.com/th"; //QByteArray targetUrl = "/az/hprichbg/rb/"; int indexStart = -1; indexStart = webContent.indexOf(targetUrl); if(indexStart != -1)//若在获取到的网页源码中找到了所需url，则get之 { //qDebug("找到了壁纸的url:"); /** webContent = webContent.mid(indexStart); indexEnd = webContent.indexOf("jpg"); indexEnd = indexEnd + 2; QUrl url( webContent.left(indexEnd + 1)); qDebug()<<url; **/ // 获取图片标题 QString str = QString(webContent); QStringList titlenames,fileurl; QRegExp exp("<h3>([^<]*)</h3>"); exp.setMinimal(false); int pos = 0; while ((pos = exp.indexIn(str , pos)) != -1) { pos += exp.matchedLength(); //qDebug() << "pos :" << pos; //qDebug() << expurl.cap(0); QString strtemp=exp.cap(0).replace("<h3>",""); //qDebug() << strtemp; strtemp=strtemp.replace("</h3>",""); //ui->textEdit->append(strtemp); titlenames.append(strtemp); //QUrl url(pos); } // 获取图片路径 QRegExp expurl("https://bing.com/[^/][^;]+\._UHD.jpg&amp;qlt=100"); expurl.setMinimal(false); pos = 0; while ((pos = expurl.indexIn(str , pos)) != -1) { pos += expurl.matchedLength(); //qDebug() << "pos :" << pos; //qDebug() << expurl.cap(0); //ui->textEdit->append(expurl.cap(0)); fileurl.append(expurl.cap(0)); } int icount=fileurl.count(); for(int i = 0; i <1; i++) { if(lastFile==titlenames[i]) { //退出。 lastFile=titlenames[0]; } emit urlFound(fileurl[i],titlenames[i]); } } else { //showStatusTips(URL_NOT_FOUND); } } else { //showStatusTips(NETWORK_CONNECTION_FAILED, reply->errorString()); } } /* strUrl:下载图片时需要的url strFilePath:下载图片的位置（/home/XXX/YYY.png） */ void MainWindow::downloadFileFromUrl(QString strUrl, QString strFilePath) { //qDebug() << strUrl << " " << strFilePath; QFile file; filePath = QDir::homePath() + "/" + "Pictures/"; QDir dir; dir.mkdir(filePath); filePath =filePath+strFilePath+".jpg"; //qDebug() << "file:"<<filePath; ui->textEdit->append(filePath); // 文件名称 file.setFileName(filePath); QPixmap picture; QByteArray byte = InitGetRequest(strUrl, "downImgFromUrl"); //qDebug()<<"数据大小："<<byte.size(); ui->textEdit->append("文件大小："+ QString::number(byte.size()/1024)+"K"); if(!picture.loadFromData(byte, "JPG")) { qDebug()<<"图片数据读取出错！"; //showStatusTips(LOAD_FROM_DATA_FAILED, QString("%1").arg(byte.size())); return; } if(!picture.save(filePath)) { ui->textEdit->append("图片保存失败！"); //qDebug()<<"图片保存失败！"; // ui->label_load->setText("保存图片失败！"); } else { //qDebug()<<"图片保存成功！"; ui->textEdit->append("图片保存成功！"); lastFile=strFilePath; //保存完成文件提交准备保存。 } ui->textEdit->show(); } //get QByteArray MainWindow::InitGetRequest(QString url, QString obj) { //循环拼接 ui->textEdit->append("开始：."); QString baseUrl =url; //qDebug() << baseUrl; //构造请求 QNetworkRequest request; request.setUrl(QUrl(baseUrl)); QNetworkAccessManager *manager = new QNetworkAccessManager(); // 发送请求 static int i = 0;//心跳计时器 QNetworkReply *pReplay = manager->get(request); //开启一个局部的事件循环，等待响应结束，退出 QEventLoop eventLoop; QObject::connect(pReplay,SIGNAL(finished()), &eventLoop, SLOT(quit())); //add timeout deal QTimer *tmpTimer = new QTimer(); tmpTimer->setInterval(40000);//40秒内没有下载完成，则自动挂断网络连接。 connect(tmpTimer,SIGNAL(timeout()),&eventLoop, SLOT(quit())); //心跳 时钟开始 QTimer *didaTimer = new QTimer(); didaTimer->setInterval(200);//0.2秒一个心跳。 //心跳 时钟描述 connect(didaTimer,&QTimer::timeout,[=](){ i++; ui->textEdit->insertPlainText("."); ui->textEdit->show(); }); didaTimer->start(); tmpTimer->setSingleShot(true); tmpTimer->start(); eventLoop.exec(); tmpTimer->stop(); //心跳 时钟结束 didaTimer->stop(); ui->textEdit->insertPlainText("用时："+QString::number(i*0.2)+"秒"); i=0;//清除计时器。 ui->textEdit->show(); if (pReplay->error() == QNetworkReply::NoError) { //qInfo() << QString("request %1 正常！").arg(obj); } else { qWarning()<<QString("request %1 handle errors here").arg(obj); QVariant statusCodeV = pReplay->attribute(QNetworkRequest::HttpStatusCodeAttribute); //statusCodeV是HTTP服务器的相应码，reply->error()是Qt定义的错误码，可以参考QT的文档 qWarning()<<QString("request %1 found error ....code: %2 %3").arg(obj).arg(statusCodeV.toInt()).arg((int)pReplay->error()); qWarning(qPrintable(pReplay->errorString())); } //获取响应信息 QByteArray bytes = pReplay->readAll(); return bytes; } void MainWindow::on_pushButton_clicked() { QSettings settings(IniFilePath, QSettings::IniFormat); // 当前目录的INI文件 lastFile = settings.value("lastFile").toString(); //获取上次的打开路径