How to execute a Thread(QwtSamplingThread) for sometime and making the GUI(mainwindow) wait for 3 seconds?.

thippu

Hi Guys,
I have created class filethread which inherits the QwtSamplingThread for filereading it executes one function in run()
filethread.cpp code:

void Filethread::run()
{
  scanfile()
}

main.cpp
code:

int main()
{
QApplication a(argc,argv);
FileThread thread;
thread.start();//this qwt thread I want it to complete the task for 3 seconds and then the compiler to star the mainwindow object which is GUI thread because this will get the data vector from the Filethread object.
MainWindow w;//this should be started after the filethread object complition.
w.resize(800,400);
w.show();
bool endapp=a.exec();
thread.stop();
return endapp;

I want qwtthread to execute first and complete it the task for 3 seconds and after this mainwindow obj.show should execute, how to do this?
how to do this, please help.

Flotisable

I think you can emit a signal when the qwt thread complete it's task.
And connect the signal to a slot of mainwindow.
Then let the mainwindow to do the things.

thippu

I would like to implement this and see. Thanks for the idea.

SGaist

Hi,

The quick and silly method: QTimer::singleShot(3000, &w, &QMainWindow::show);