Fast updation for controls in QT3

[soumyadeep_pan]

I am using QT 3.3 for my application and updating near about 150 line edit boxes. The rate of updation is twice in a second, and this updation will continue for more than 30 minutes which showing some problems like -

X Error: BadRequest (invalid request code or no such operation) 1
Major opcode: 255
Minor opcode: 0
Resource id: 0x40035e



MyApplication: Fatal IO error: client killed

There is no delay between the updation of 2 line edits.

Thanks in advance.

[jacek]

Do you use threads?

[soumyadeep_pan]

Yes I'm using pthread, I'm passing the main window object (which having 150 line edits) to the thread, and updating the line edits from the threads.

I have tried using QThread, which also showing the same issue.

[jacek]

Read this carefully: http://doc.trolltech.com/3.3/threads.html

Especially the part that says you can't touch the GUI from a non-GUI thread.

[soumyadeep_pan]

I tried with the QThread also, which is not working. I am uploading the sample program, that I have done using QThread. Thanks in Advance .....

[jacek]

Could you repeat my previous post with your own words?

[soumyadeep_pan]

Thanks a lot for that the XLib problems are not coming for QThread. But a new problems arise, if I'm using (for the samples I've attached in my previous post) QThread the main window is not coming properly (It's getting hanged), in the document also I could not get any solution for this, can anybody help me ?

[jacek]

if I'm using (for the samples I've attached in my previous post) QThread the main window is not coming properly

You can't mix threads and GUI.

[soumyadeep_pan]

To my orginal problem, can I do parallel GUI updation in QT ? Is there any way to do parallel processing with continuous parallel updation GUI in QT? thanks in advance .

[jacek]

To my orginal problem, can I do parallel GUI updation in QT ? Is there any way to do parallel processing with continuous parallel updation GUI in QT?

You would know that if you read that document I've pointed you to. You can use threads for processing, but only the main thread can do anything with the GUI.

[soumyadeep_pan]

only the main thread can do anything with the GUI.

What do you mean by a main thread ? Can I do any semaphore post to that thread ?