QT Windows GUI main window freezes while running

Ravi0101

Hi @jsulm Thank you very much for your response.

I debugged the while loop and it showed me this:

Ravi0101

This post is deleted!

Ravi0101

@jsulm I got this exception:

Exception at 0x770eb5b2, code: 0xe06d7363: C++ exception, flags=0x1 (execution cannot be continued) (first chance) in dwrite!DWriteCreateFactory

JonB

@Ravi0101
If you get an exception in the debugger look at the stack trace window for where it emanated from in your code.

Ravi0101

@JonB Also I have noticed that cpu usage is going to 100 % when running mainwindow.ui and then it freezes. could this be issue with the while loop in my code please?

jsulm

@Ravi0101 said in QT Windows GUI main window freezes while running:

could this be issue with the while loop in my code please?

Yes, it can. That is why I also suggested to add some debug output.
Please add a qDebug() output just after the loop and see whether you ever see it. If you don't then you have an endless loop.

Ravi0101

@jsulm Thank you, I did that and qdebug output is displayed, please find below screenshot.

jsulm

@Ravi0101 It's not clear from the screen shot whether the output is inside the loop or outside?
You should post code as text not pictures.

Ravi0101

@jsulm please find below.

void MainWindow::plotData(QByteArray data)
{
auto count = data.size();
qDebug() << "bytearray size 1: " << count;
data.remove(0,1);
count = data.size();
qDebug() << "bytearray size 2: " << count;

qDebug() << data;
qDebug() << data.size();

int pos = 0, arrsize = data.size(), sizeInArray = 3;
QList<QByteArray> arrays;

std::vector<uint32_t> hrm;
// std::vector<double> hrm_final;
// uint32_t old_hrm = 0;
while(pos<arrsize){
QByteArray arr = data.mid(pos, sizeInArray);
qDebug() << arr;
uint32_t hrm = (arr[0] << 16) | (arr[1] << 8) | (arr[2]);
qDebug() << QString::number(hrm);
// if(arrsize!=0){
pos+=arr.size();

//plot with hrm diffference

// if(pos == 0)
// {
// old_hrm = hrm;
// continue;
// }
//else
// {
this->plotData_Y.removeFirst();

        //**plot with python code reference**
//double hrm_final =(hrm / qPow(2,31)) * 10;
 //this->plotData_Y.append(hrm_final);
 //  qDebug() << QString::number(hrm_final);

        //**plot with hrm difference**
   // this->plotData_Y.append(old_hrm-hrm);
  // qDebug() << QString::number(old_hrm-hrm);

    //**plot with original hrm**
     this->plotData_Y.append(hrm);

    ui->plot->graph(0)->setData(this->plotData_X, this->plotData_Y);
    // set axes ranges, so we see all data:
    ui->plot->replot();
    }
 qDebug() << "not an endless loop";
}

//}

jsulm

@Ravi0101 Then please run through debugger untill it hangs and then check the stack trace to see where it hangs...