QT打开图片文件夹快速播放图片

1. 打开文件夹

void MainWindow::open()

{

    QFileDialog* fd = new QFileDialog(this);

      fd->setWindowTitle(tr("Open Folder"));

      fd->setDirectory("./");

      fd->setFileMode( QFileDialog::DirectoryOnly );

      QStringList fileName;

      if ( fd->exec() == QDialog::Accepted )

      {

          fileName = fd->selectedFiles();

          picManger.addFolderImages(fileName.at(0));

          picPlayer.setFileList(picManger.getFileList());

          qDebug() << "....... playNext 3 time:"<< fileName.at(0);

      }

}

2.压缩保存新图片：图片太大加载慢所以要压缩（参考：http://blog.csdn.net/shado_walker/article/details/54023137）

#include "picmanager.h"

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

PicManager::PicManager(QObject *parent) :

    QObject(parent)

{

}

QStringList PicManager::getFileList()

{

    return this->newFileList;

}

void PicManager::addFolderImages(QString path)

{

    //判断路径是否存在

    QDir dir(path);

    if(!dir.exists())

    {

        qDebug() << "....... addFolderImages !dir.exists() return  path:"<< path;

        return;

    }

    QString newDir = createNewDir(path);

    if(newDir == ""){

        qDebug() << "....... addFolderImages newDir:"<< newDir << "return";

        return;

    }

    addImgPaths2FileList(path);

    compressAndCopyImgs2NewPath(newDir);

}

void PicManager::compressAndCopyImgs2NewPath(QString newPath)

{

   newFileList.clear();

   foreach(QString str, fileList) {

        int index = str.lastIndexOf("/");

        QString fileName =  str.right(str.length()-index);

        QString desFilePath = newPath + fileName;

        //qDebug() << ".......compressAndCopyImgs2NewPath desFilePath:"<< desFilePath;

        compressImg(str,desFilePath);

    }

}

QString PicManager::createNewDir(QString oldPath)

{

    QDir prodir;

    int index = oldPath.lastIndexOf("/");

    QString newDir = prodir.currentPath() + oldPath.right(oldPath.length()-index);

    QDir dir(newDir);

    if(dir.exists())

    {

        qDebug() << "....... createNewDir dir.exists() return  newDir:"<< newDir;

        return newDir;

    }else if(dir.mkdir(newDir)){

        return newDir;

        qDebug() << ".......   path:"<< oldPath << " newDirName:" << newDir ;

    }

    return "";

}

void PicManager::compressImg(QString srcFilePath,QString desFilePath)

{

    qDebug() << ".......compressImg srcFilePath:"<< srcFilePath << " desFilePath" << desFilePath;

    QFile desFile(desFilePath);

    if(desFile.exists()){

        newFileList.append(desFilePath);

        qDebug() << ".......compressImg file exists return";

        return;

    }

    QImage img;

    img.load(srcFilePath);

    QImage result = img.scaled(800, 600, Qt::KeepAspectRatio, Qt::FastTransformation);//.scaled(260, 140, Qt::KeepAspectRatio, Qt::SmoothTransformation);

    bool isSuccess = result.save(desFilePath, "JPEG", 100);

    if (!isSuccess)

    {

        qDebug() << "save image fail!";

    }

    QFile file(desFilePath);

    qint64 fsz = file.size();

    int quality = 100;

    while (fsz > 1024 * 512)

    {

        quality = quality - 5;

        isSuccess = result.save(desFilePath, "JPEG", quality);

        if (!isSuccess)

        {

             qDebug() << "save image fail! quality=" << quality;

        }

         fsz = file.size();

         qDebug() << "+++++++++++++++++++++++quality=" << quality;

         if (quality <= 0)

        break;

    }

    newFileList.append(desFilePath);

}

void PicManager::addImgPaths2FileList(QString path)

{

    QDir dir(path);

    dir.setFilter(QDir::Files);// | QDir::NoSymLinks

    QFileInfoList infolist = dir.entryInfoList();

    int file_count = infolist.count();

    if(file_count <= 0)

    {

        return;

    }

    //QStringList string_list;

    fileList.clear();

    for(int i=0; i i++)

    {

        QFileInfo file_info = infolist.at(i);

        QString suffix = file_info.suffix();

        if(QString::compare(suffix, QString("JPG"), Qt::CaseInsensitive) == 0)

        {

            QString absolute_file_path = file_info.absoluteFilePath();

            qDebug() << "....... addFolderImages absolute_file_path:"<< absolute_file_path;

//            QFile file(absolute_file_path);

//            file.rename(i > 9 ? i+".jpg" : "0"+i+".jpg");

            fileList.append(absolute_file_path);

        }

    }

}

3.播放

picManger.addFolderImages("/Users/ljx/imgs");

    picPlayer.initPalySreen(ui->imgShowLbl);

    picPlayer.setFileList(picManger.getFileList());

picPlayer.startPlay(18);

#include "picplayer.h"

#include 

#include 

#include 

#include 

#include 

#include 

PicPlayer::PicPlayer(QObject *parent) :

    QObject(parent)

{

    pThread = new PicPlayThread;

    qThread = new QThread(this);

    pThread->moveToThread(qThread);

    //start thread

    connect(this,&PicPlayer::startPlaySignals,pThread,&PicPlayThread::threadTimeOut);

    connect(pThread,&PicPlayThread::sendSignal,this,&PicPlayer::dealSignal);

}

void PicPlayer::initPalySreen(QLabel *showLbl)

{

    this->showLbl = showLbl;

}

void PicPlayer::setFileList(QStringList fileList)

{

    this->fileList = fileList;

    showFirstPic();

}

void PicPlayer::showFirstPic()

{

    if(fileList.size()<=0){

        return;

    }

    currentIndex = 0;

    this->playNext();

}

void PicPlayer::startPlay(int numPSecond = 18)

{

    this->fileList = fileList;

    if(fileList.size()<=0){

         return;

    }

    if(qThread->isRunning()){

        qDebug() << "........qThread->isRunning() return";

        return;

    }

    qDebug() << "........-> playSignal";

    pThread->setRunning(true);

    pThread->setNumPeSecond(numPSecond);

    //start thread

    qThread->start();

    emit startPlaySignals();

}

void PicPlayer::stopPlay()

{

    currentIndex = 0;

    pThread->setRunning(false);

    qThread->quit();

    qThread->wait();

}

void PicPlayer::dealSignal()

{

    qDebug() << "....... dealSignal currentIndex:"<< currentIndex;

    if(currentIndex == fileList.size() -1){

        //this->initUI();

        this->stopPlay();

        return;

    }

    this->playNext();

}

void PicPlayer::playNext()

{

    QString filePath = fileList.at(currentIndex);

    showPicInLbl(filePath);

}

void PicPlayer::showPicInLbl(QString filePath)

{

    QDateTime time = QDateTime::currentDateTime();//获取系统现在的时间

    QString str = time.toString("yyyy-MM-dd hh:mm:ss zzz ddd"); //设置显示格式

    qDebug() << "....... playNext start time:"<< str << "path:" << filePath;

    QImage image;

    image.load(filePath);

    qDebug() << "....... playNext 2 time:"<< QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss zzz ddd") << "path:" << filePath;

    image = image.scaled(QSize(800,600),Qt::KeepAspectRatio);

    qDebug() << "....... playNext 3 time:"<< QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss zzz ddd") << "path:" << filePath;

    showLbl->setPixmap(QPixmap::fromImage(image));

    showLbl->update();

    currentIndex += 1;

    QDateTime time2 = QDateTime::currentDateTime();//获取系统现在的时间

    QString str2 = time2.toString("yyyy-MM-dd hh:mm:ss zzz ddd"); //设置显示格式

    qDebug() << "....... playNext end  time:"<< str2 << "path:" << filePath;

}

#include "picplaythread.h"

#include "QThread"

#include 

PicPlayThread::PicPlayThread(QObject *parent) :

    QObject(parent)

{

    this->onRunning = false;

    this->numPeSecond = 18;

}

void PicPlayThread::threadTimeOut()

{

    while(onRunning){

        qDebug() << "........-> sendSignal";

        emit sendSignal();

        QThread::msleep(1000/(this->numPeSecond));

    }

    if(!onRunning){

        this->onRunning = false;

        this->numPeSecond = 18;

    }

}

void PicPlayThread::setRunning(bool run = false)

{

    this->onRunning = run;

}

void PicPlayThread::setNumPeSecond(int num = 18)

{

    this->numPeSecond = num;

}

代码下载：http://download.csdn.net/detail/casun_li/9808993

下一步就是要研究将图片制作视频：暂没有参考：只找到一个IOS的文章：http://blog.csdn.net/willib/article/details/53858035