Problems with image1.canvas.pixels
lazarus / 8-Other

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TTL · 2004-09-25 20:11

I get an error when I click on the button with the following code:

procedure TForm1.Button3Click(Sender: TObject);
begin
image1.canvas.pixels[1,1] := 255;
showmessage('Color: '+inttostr(image1.canvas.pixels[1,1]));
end;

image1 correctly displays a red dot on position x=1,y=1. But mostly
(around nine of ten times) no message box with the color is displayed.
Instead the program shows "Access violation." in an error dialog box.
I have tried it with lazarus 0.9.1 and 0.9.2.1 the results are the
same.
I am using Debian with FPC 1.9.4.
Is there a bug in Lazarus/FPC or is my code simply too bad?

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Lightning · 2004-09-27 11:08

It seems that TCanvas has bugs, try getting the latest Lazarus sources
and if it doesn't work the latest FPC compiler, i think 1.9.4 isn't
the latest.

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Anonymous · 2004-11-02 22:06

I have the same problem
Fedora Core 2, lazarus 0.9.5

But in Win Xp, lazarus 0.9.5 is ok

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Spike · 2005-12-28 21:33

Lazarus 0.9.10, fpc 2.0.2, Fedora Core 4
This still isn't fixed.
The write function of the Pixels property works, but the read one
fails miserably.
Is anyone going to fix this?

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felipemdc · 2005-12-28 21:44

Could you add a bug report here:
http://www.lazarus.freepascal.org/mantis/main_page.php

This will dramatically increase the chances that the bug is fixed
soon.

thanks,

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Spike · 2005-12-28 22:53

Oops, I've got that the other way around. Writing works, it's the
reading that's the problem.

I've reported the bug, if anyone cares, here's the link:

http://www.lazarus.freepascal.org/mantis/view.php?id=1569