[DUG] graphics stops updating

[Ross Levis]

The figures are coming from a thread and updating on an event, but this is not the problem.  I currently have 7 different controls on the screen showing the data visually.  2 Tlabels, 2 analogue meter components for left and right levels.  1 component which displays both levels as coloured bars in the one component, a JvSpecialProgress component (Jedi), and a standard TProgressBar.  Except for the standard TLabels and TProgressBar, the other 4 components will stop at various times while others continue working.  All are being updated in the same procedure.

The problem will often occur if I move the form or minimize it, or hide it behind another form.  But often only one or 2 of them will stop updating.  It is very strange.

When one stops responding, the area of the screen where the component resides does not refresh correctly.  It leaves bits of other screen information in it's place.

Any further ideas?

Cheers,
Ross.
  ----- Original Message ----- 
  From: Matt Comb 
  To: NZ Borland Developers Group - Delphi List 
  Sent: Sunday, June 19, 2005 3:31 PM
  Subject: Re: [DUG] graphics stops updating


  Is the mechanism that is feeding the information to these controls (or causing the update) threaded ? Sounds like you may have a threading issue which causes it to stop.

  Matt.
    ----- Original Message ----- 
    From: Ross Levis 
    To: NZ Borland Developers Group - Delphi List 
    Sent: Sunday, June 19, 2005 3:28 PM
    Subject: [DUG] graphics stops updating


    Now that I have good logarithmic values, I've installed a couple of independent 3rd party free VU meter components to visually display the values.  This is working well most of the time, but I'm having trouble with both of these components.  For no apparent reason, they freeze on the screen.  The components are still running and drawing lines on the canvas, as I've traced this through the code, but nothing appears on the screen.  If I minimize and restore the form, the components often become invisible.  They are not being repainted.

    I've tried Invalidate, but this makes no difference, apart from some minor flickering of the component while it is working, but not when it isn't.  The components are being updated every 50ms.  This is a 2Ghz PC.

    I've tried Application.ProcessMessages.  Any other ideas?

    Thanks,
    Ross.


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