USES ComObj or Excelxx causes C0000005 Access Violation

[6volt]

Delphi 7.

If I uncheck Access Violation in Debugger Options, I don't get the error.

Checked this issue on other machines in office and they DO NOT behave this way.

The code that does this is a new Project1 where I merely add ComObj or Excelxx to the USES, then hit the green triangle run button.

I have replaced ComObj and Excel97 and have done a repair install of Delphi 7 and it still does it.

Any thoughts?

Could something be damaged in the WindowsXP Pro OS on this machine?

Thanks in advance,
Tom

 

[whosrdaddy]

seems to me you have a corrupt OLEAUT32.DLL. Maybe repairing your windows system may help. Dou you have problems when copying excel objects to word (for example)?

-----------------------------------------------------
What You See Is What You Get
Never underestimate tha powah of tha google!

 

[6volt]

whosrdaddy:

I just tried playing around with an XL chart that I dragged into a Word doc. I was able to OPEN that object from Word and then edit the values in XL.

I did this on 2 PC's, one "good" one and the one with the problem.

I couldn't see any different behavior between the two.

Still, I feel that the problem is something as you suggest.

I'm going to check out that DLL and see if I can detect a difference between PCs - maybe a binary compare...

 

[whosrdaddy]

do you have the same issue when you include the activeX unit? (only that unit)

-----------------------------------------------------
What You See Is What You Get
Never underestimate tha powah of tha google!

 

[whosrdaddy]

lookaing at the code in activeX unit and I see it references those dll's:

ole32 = 'ole32.dll';
oleaut32 = 'oleaut32.dll';
olepro32 = 'olepro32.dll';


so one of them must be your problem...

-----------------------------------------------------
What You See Is What You Get
Never underestimate tha powah of tha google!

 

[6volt]

I tried the USES activex and it is OK - no problems.

Each of the following produce the C0000005:

ComObj, Excel97, Excel2000, ExcelXP

 

[6volt]

Did some surveying to find that EVERY file in the Ocx\Servers directory produced the same identical access violation:

ox7c83227d: Read of address 0x0000c038

the dump show a line of code just after

kernel32:IsBadStringPtrA

Some files in the lib\ directory were bad: DBOleCtl

and some were good: activex, comapp, comctrls