OLE and Access Segmentation Violations

Question

Has anybody used Forte to communicate with external components using OLE
Automation? We are creating segmentation violations through some of our
use of this interface, and need to know if there are some 'golden rules'
that can guide developers as they use the feature.
Thank you!

Answer 1

Hi!
I am not sure that I can give you any "golden rules" for interfacing
with OLE, but I can give you some thoughts on where to look for problems
that can result in Segmentation Violations.
I have often seen segmentation violations arise as a result of a NIL
object. You might want to try turning on the trc:lo:25 trace flag to
see if there is a NIL object exception being raise right before the seg
v. You have to be careful with the trc:lo:25 flag, though, since it
will show you every exception, no matter what, that is raised within
Forte (even if it's been handled internally). This is of greater
significance to OLE projects, since Forte tries several different ways
of starting an OLE server and uses internally handled exceptions to
notify itself if a certain method failed.
Another thing to try is just-in-time debugging. You will need Microsoft
Visual C++ installed on the machine where the OLE code is running, and
you will need to set the FORTE_NOHANDLER environment variable to TRUE.
In the MSVC development environment, go to the Tools --> Options
properties sheet, and choose the Debug tab. On that tab, make sure that
Just-In-Time Debugging is selected. Then, run the application. When
you encounter the seg v, you should get a dialog box asking if you want
to debug the application. Choosing yes (actually, I think that pressing
Cancel does this - the dialog box tells you) will bring you into the
MSVC development environment, where you can try some intense debugging.
I hope this helps!
-Katie
[email protected] wrote:
>
Has anybody used Forte to communicate with external components using
OLE
Automation? We are creating segmentation violations through some of
our
use of this interface, and need to know if there are some 'golden
rules'
that can guide developers as they use the feature.
Thank you!--
Katie Carty
Forte Consulting
4801 Woodway Drive
Suite 300E
Houston, Texas 77056
vmail: 510-986-3802
email: [email protected]
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