>>>>How can I check for the existence of a class? Preferrably a method that searches all available libraries.
>>>
>>>If you open VCX file that only records with field 'Reserved1'="Class" will contain class name in field 'Objname'.
>>
>>What I really need the function for is my base smartgrid class, that allows me to specify what class to use for the control for each datatype. I would like a sort of safe guard in the class that chexks for the existence of the class bvefore it attempts to ADDOBJECT. IOW, this would be used at runtime, not at the command window.
>
>Maybe it's simpler to have app object property-array or INI file etc. containing all available classes, because as I understand you are not going to distribute VCXs separately.

I have not tested this exact code but I use similar to find if a class is used to init this object after the form has been init.
= AMEMBERS(apname,thisform,2)
oldexact=SET("EXACT")
IF alen(apname)<>0
SET EXACT OFF
aptempcnt=alen(apname)
FOR i=1 to aptempcnt
apcount=ascan(apname,'myclass',1,1)
IF apcount<>0
you have class
else
you don't
endif
=adel(apname,1,1)
NEXT
ENDIF
set exact &oldexact