Exception trouble

[lamer]

Hi all!
I open file by GetOpenFileName and sometimes (rarely) the program crashes with the folowing mesage:

Unhandled exception at 0x00000000 in MyProg.exe: 0xC0000005: Access violation reading location 0x00000000.

Then I have a message box:

There is no source code available for the current location.

with prompting to disassebling.
Clicking "yes" I see the exception on the first line:

00000000  ???

What can it mean?

Thank you.

[zooba]

It means that at some point the code has attempted to jump to address 00000000h.

Things to check for:

Code Select Expand

jmp eax  ; or other registers or memory locations

Unbalanced stack in procedures (ie. ret tries to return to 00000000h)

Null pointers being passed to API functions (CallWindowProc et al)

[Fab]

Hello world, and lamer.

I had the same problem with GetOpenFileName and GetSaveFileName, it'd happen on the 3rd call to either each time I ran my program. I fixed the problem by checking over my code and making sure the stack was behaving and I was preserving the esi, edi and ebx. But also I fixed calls to GlobalFree which I was passing the wrong pointers too, after that both calls worked all the time.

Hope this helps!

[lamer]

Hi guys!
The phrase "There is no source code available for the current location." confused me. I expected to see at least some registers :green
After all I found the point, but it was nightmare to do.
The problem was quite usual - the pointer was outside of memory block.

Thank you