One of the solutions is:

lerror=.f.
on error lerror=.t.
lo=createob("Hello")
on error
if lerror
* Class not exist, not registered, not supported ....


>Is there a way to verify that a class definition, ie "object.classname" exists before using createobject to create the object?
>
>We are writing hardware interfaces for a POS program, and when a user chooses a hardware device and tries the device, sometimes it crashes because they haven't installed the hardware device drivers properly.
>
>Anyway, it's annoying to me and the user when class definitions don't exist, or haven't been installed and they get an application shutdown message.
>
>Thanks!