QThread && QTextStream readline()

[spawnsito]

Hello everyone. I´m Spawnsito and I need help.

I am making an application where I need to read a file too heavy. The file has a default format:
XXXXX, YYYYYY, HEIGHT -> all are number.

I'm reading this file from a QThread through QTextStream. Everything works fine until the thread emit the progress that has processed the file. At iteration after emit, the function readline() in QTextStream take a partial string of the file.

If I remove the emit of the sign of progress, the thread is working properly, however the progress bar is not useful.

I hope I have explained my problem correctly.

void CargarDemThread::run(){
   float altura;
   QFile file(_rutaDem);
   int progreso = 1;
   if (file.open(QIODevice::Text | QIODevice::ReadOnly)){
            qint64 size = file.size();
            QTextStream in(&file);
            while(!in.atEnd()){
               f = in.readLine();
               sl = f.split(",");
               altura = sl.at(2).toFloat(); 
               _dem->addValue(altura); 
               if (in.pos/size()*100>progreso){
                  emit progress(progreso);
                  progreso++;
               }
         }
}

void CargarDemThread::run(){
   float altura;
   QFile file(_rutaDem);
   int progreso = 1;
   if (file.open(QIODevice::Text | QIODevice::ReadOnly)){
            qint64 size = file.size();
            QTextStream in(&file);
            while(!in.atEnd()){
               f = in.readLine();
               sl = f.split(",");
               altura = sl.at(2).toFloat(); 
               _dem->addValue(altura); 
               if (in.pos/size()*100>progreso){
                  emit progress(progreso);
                  progreso++;
               }
         }
}

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