emit is slow in Thread?

[marcel]

OK.

I will try this.

I want to ask one more thing that can I take a return value from the emit signal because I want this QTreeWidgetItem pointer to be added in the list which is in thread.

No, you can't have a return value for a signal./ This is mainly because you don't actually implement the signals. You just declare them. The "implementation" is done by moc.

because I want this QTreeWidgetItem pointer to be added in the list which is in thread

because I want this QTreeWidgetItem pointer to be added in the list which is in thread

To copy to clipboard, switch view to plain text mode 

Create a small class or struct that has a few members(public, nothing fancy).
You emit the signal with this an instance of this class as parameter. In the worker thread, before you emit, populate the class with the needed data( the tree item, and whatever you may need in the GUI thread, when you receive the signal ).

Be careful that when emitting signals with custom types, these types have to be registered with Qt.

See qRegisterMetaType.

Regards