>>>>I want to know whether a class exists in a certain library before I try to instantiate it in my program (reason: I don't want to get an error message if it doesn't exist). I couldn't find a function for this and the only thing I could come up with is to open the class library programatically and search for objname. This worked, but I felt a little uneasy about touching the .vcx from within a program.
>>>>
>>>>Can anyone offer any advice, caveats, etc. on this?
>>>>
>>>>Thanks,
>>>>
>>>>Sylvia
>>>
>>>You can put error trap on CREATEOBJECT() line and check for errors without interrupting of program flow.
>>
>>I already have an error routine in place for the whole program, which under normal circumstances writes errors to a file, then closes down. I thought about temporarily swapping out that routine with another to check for just this error condition, but it started getting into a lot of steps, so I started looking for an alternative.
>
>Local error trap is very simple:
>Local cError,lErrorflag
>cError=on("ERROR")
>on error lErrorfalg=.t.
>oMyobject=createobject("myclass")
>on error &cError.
>if lErrorfalg=.t.
>return 1
>else
>return 2
>endif

Ed -

I didn't know this could be done. Are you saying that this local error routine will not overwrite my global error routine after I exit from this module? If that's the case, then you're right, this would be better.

Sylvia