Results 1 to 6 of 6

Thread: Lost events.

  1. #1
    Join Date
    Feb 2010
    Posts
    52
    Thanks
    6
    Thanked 2 Times in 2 Posts

    Default Lost events.

    Hi,
    I have a GUI application which uses a QTimer to refresh itself, making a number of database calls in the timer handling slot. This mostly works fine, except, that I'm occassionally loosing key events and mouse events.

    Any ideas as to what might be happening ?

    Thanks in advance,
    Chris.

  2. #2
    Join Date
    Jun 2007
    Location
    India
    Posts
    1,042
    Thanks
    8
    Thanked 133 Times in 128 Posts
    Qt products
    Qt3 Qt4 Qt/Embedded
    Platforms
    MacOS X Unix/X11 Windows

    Default Re: Lost events.

    Are the key events are lost completely or they are delivered after a short delay/jerk?

  3. #3
    Join Date
    Feb 2010
    Posts
    52
    Thanks
    6
    Thanked 2 Times in 2 Posts

    Default Re: Lost events.

    Lost completely. For example typing 1234567890 into a text edit may result in 12890 appearing.

  4. #4
    Join Date
    Jan 2006
    Location
    Warsaw, Poland
    Posts
    33,359
    Thanks
    3
    Thanked 5,015 Times in 4,792 Posts
    Qt products
    Qt3 Qt4 Qt5 Qt/Embedded
    Platforms
    Unix/X11 Windows Android Maemo/MeeGo
    Wiki edits
    10

    Default Re: Lost events.

    Try delegating the database calls to a thread (remember you need to have a separate database connection for each thread).
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


  5. The following user says thank you to wysota for this useful post:

    chris_helloworld (15th September 2010)

  6. #5
    Join Date
    Feb 2010
    Posts
    52
    Thanks
    6
    Thanked 2 Times in 2 Posts

    Default Re: Lost events.

    Yes, thats going to be my next step, though I'd have liked to have understood where my events were being lost.

  7. #6
    Join Date
    Jan 2006
    Location
    Warsaw, Poland
    Posts
    33,359
    Thanks
    3
    Thanked 5,015 Times in 4,792 Posts
    Qt products
    Qt3 Qt4 Qt5 Qt/Embedded
    Platforms
    Unix/X11 Windows Android Maemo/MeeGo
    Wiki edits
    10

    Default Re: Lost events.

    Probably in the windowing system.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


Similar Threads

  1. Qt and OpenGl (I'm lost)
    By anon789 in forum Newbie
    Replies: 6
    Last Post: 17th September 2010, 20:09
  2. Hightlight not lost
    By wirasto in forum Qt Programming
    Replies: 0
    Last Post: 5th August 2010, 13:16
  3. Events lost in IPC through local socket in Windows
    By yogesh in forum Qt Programming
    Replies: 1
    Last Post: 24th May 2009, 11:38
  4. lost signals ?
    By deepinlife in forum Qt Programming
    Replies: 3
    Last Post: 17th June 2008, 10:11
  5. Lost widget
    By anli in forum Qt Programming
    Replies: 6
    Last Post: 29th July 2006, 19:02

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Digia, Qt and their respective logos are trademarks of Digia Plc in Finland and/or other countries worldwide.