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<DIV dir=ltr align=left><SPAN class=040575002-31032005><FONT face=Arial
color=#0000ff size=2>Are you sure the parent is there... Check to see if
the parent exists before adding child.</FONT></SPAN></DIV>
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<FONT face=Tahoma size=2><B>From:</B> delphi-bounces@ns3.123.co.nz
[mailto:delphi-bounces@ns3.123.co.nz] <B>On Behalf Of </B>Ross
Levis<BR><B>Sent:</B> Thursday, 31 March 2005 2:43 p.m.<BR><B>To:</B> NZ Borland
Developers Group - Delphi List<BR><B>Subject:</B> [DUG] Invalid Pointer
Operation<BR></FONT><BR></DIV>
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<DIV><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">
<DIV><FONT face=Arial size=2>It's one of those problems that's going to be hard
to track down I think. A beta tester of mine is getting this occasionally
in my software, and I have seen it once or twice over the last couple of months
myself while testing, but I wasn't able to duplicate it.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>It's causing a ListView on my main form to stop
updating and it goes blank, even though the program still functions correctly
while the error is displayed. This is due to the fact that this
application uses a timer for it's main operation, and the Timer still
functions while the error is displayed.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>You can see the errors below sent to me by the
user. The Access Violation occurs immediately after the Invalid Pointer
Operation.</FONT></DIV></SPAN></FONT></DIV>
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style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><IMG id=_x0000_i1025 height=126
src="cid:040575002@31032005-119B" width=197><o:p></o:p></SPAN></FONT></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 12pt"><o:p>The Access Violation is not a 400000 address so I
can't use this to pinpoint a line in my code. I can't duplicate the error
so can't step through code to track it down. I'm rather stumped.
Does anyone have any ideas what it could be.</o:p></SPAN></FONT></P>
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style="FONT-SIZE: 12pt"><o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 12pt"><o:p>Since the ListView is going blank, does that point
to some problem in the ListView VCL code, which I must be causing
somehow?</o:p></SPAN></FONT></P>
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style="FONT-SIZE: 12pt"><o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 12pt"><o:p><FONT face=Arial size=2><FONT color=#000000>Many
thanks,<BR><BR>Ross
Levis<BR></FONT></FONT></o:p></SPAN></FONT></P></DIV></BODY></HTML>