Qtconcurrent, multithread, invoke

minjunkim

hi, i want to show MyDialog by using concurrent

MyDialog is created in mainClass.

i try to call MyDialog in anotherClass by using concurrent

but..

below is my code and error

<main.cpp>
QtConcurrent::run(myDialogClass, &MyDialogClass::print, QString::fromLocal8Bit("show dlg"));

<MyDialogClass.cpp>
void MyDialogClass::print(QString msg)
{
this->setVisible(true); // error (cannot send events to objects owned by a different thread.)

i think that it is mainThread, non-mainthread problem

I solved a similar problem by using invoke method in c #.
This is a feature that forces it to be executable in other classes.

Can i do something similar in qt?

dheerendra

Yes it thread issue. You need to use in main thread only.

minjunkim

@dheerendra

thank you!

i solved this problem by using Signal SLots mechanism in main thread

dheerendra

That is the right way.