Hi,
Im pretty new at Qt and english isnt my main language but I will try to explain my doubt.

Im creating a program that reads a text file and print its last line in a textBox after you press a button (Stream). The thing is I want the textBox to update automatically after a new line is add in the text file, while I keep read the text file and dont close it.

For example, this is my text file at first time I read it:

Qt Code: 
  1. Hello World.txt
  2.  
  3. 0
  4. 1
  5. 2
  6. 3
  7. 4
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There should be printed ‘4’ in the textBox. (until here all OK)

But after the first read I add a new line in the text file with the number ‘5’, then the program should update automatically the textBox and add that new line.

I’ve made the same program a few months ago in C++ but now I want to put it in Qt

Qt Code: 
  1. while (1)
  2. {
  3.    if (logfile.is_open())
  4.    {
  5.       logfile.seekg(0, logfile.end);
  6.       string line;
  7.       while (true)
  8.       {
  9.          while (getline(logfile, line))
  10.         {
  11.          strncpy_s(send_data, line.c_str(), sizeof(send_data));
  12.          send_data[sizeof(send_data)-1] = 0;
  13.          ...
  14.         }
  15.       }
  16.    }
  17. }
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In Qt for now I have something like this

Qt Code: 
  1. void PC::on_pushButtonStream_clicked()
  2. {
  3.     QFile file(filename);
  4.     if(!file.open(QIODevice::ReadOnly))
  5.         QMessageBox::information(0,"info",file.errorString());
  6.     if(file.isOpen()){
  7. //        while(true) // << CRASH
  8.         {
  9.             while (!file.atEnd()) {
  10.                 QByteArray line = file.readLine(); 
  11.                 ui->textBrowserLog->setText(line);
  12.             }
  13. //        }
  14.     }
  15. }
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For now I have to click all time the Stream button to update the textBox

I’ve also tried to do a

Qt Code: 
  1. while(file.isOpen())
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but it crashes.

Thank you in advance.