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Figuring out what reference caused an access violation



Further to my question about QTControl being stable, I ran a program that used it. After running a while, and playing a few Quicktime and MP4 files, I got an error dialog that said "Access violation at address 6691332D in module 'Quicktime.qts'. Read of address 00000000."

Program is written in Delphi 7, the Quicktime.qts is in C:\windows\System32 and is version 7.1.5.120.

OS is Win XP SP2.

Is there any way I can try and figure out what's at that address that's trying to read the wrong address? Part of my new program (the one that crashed) included changes where I replaced Delphi string assignments like

QTControl1.URL := '';

with 

QTControl1.URL := #0#0;

as I saw mentioned in an earlier thread from August 2006.
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