mardi 21 avril 2015

QDir::remove() always causing a crash when called in specific SLOT

Everytime I call QDir::removeRecursively() my application crashes AFTER having removed the folder containing the files correctly. Having done some testing I found out that it depends on how I call the function. This is my code:

Recorder::Recorder(ParentClass *parent): QObject(parent){

     connect(this,SIGNAL(finishedRec(QString,QString)),this,SLOT(finishedRecording(QString,QString)));
}

void Recorder::start(){
    if (!recording){
        recording=true;
        recThread.reset(new std::thread(&Recorder::recordThread, this));
    }
}

void Recorder::stop(){
    recording = false;
    recThread->join(); recThread.reset();
}
void Recorder::recordThread(){
    QString picDir;
    QString filename;
    //....
    while(recording){
        //writing frames to folder
    }    
    emit finishedRec(picDir,filename);    
}

void Recorder::finishedRecording(QString picDir, QString filename){
    QProcess* proc = new QProcess();
    vecProcess.push_back(proc);
    vecString.push_back(picDir);
    proc->start("C:\\ffmpeg.exe", QStringList() <<"-i"<< picDir << "-r"<< "30" << "-vcodec"<< "ffv1" << filename);
    connect(proc,SIGNAL(finished(int)),this,SLOT(finishedProcess()));
}

void Recorder::finishedProcess(){
    for (int i=0; i<vecProcess.size();i++){
        if(vecProcess.at(i)->state()==QProcess::NotRunning){
            delete vecProcess.at(i);
            vecProcess.erase(vecProcess.begin() + i);

            QString folderToRemove=vecString.at(i);
            folderToRemove.chop(12);
            qDebug() << folderToRemove;
            QDir dir(folderToRemove);
            dir.removeRecursively();
            vecString.erase(vecString.begin() + i);

        }
    }
}

Only if I leave dir.removeRecursively() in, my application will always crash. Without it everything works as intended. Even deleting all the files with

QDir dir(path);
dir.setNameFilters(QStringList() << "*.*");
dir.setFilter(QDir::Files);
foreach(QString dirFile, dir.entryList()){
    dir.remove(dirFile);
}

will cause a crash AFTRER all the files were deleted.

I'm running my recordThead as a std::unique_ptr<std::thread>. I did try to run the thread as a QThread but that gave me the exact same result. If dir.removeRecursively() was called the program will crash after finishing the event in finishedProcess()

Calling removeRecursively() in a different event loop works. Why doesn't it work when using it in a SLOT like shown in my example?

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