thanks for the reply.

I used struct.vcx in order to get the printersize number (Article #304639), I have added:

SET CLASSLIB TO STRUCT.vcx
If not "convert" $ Upper( Set("Library") )
Set Library to (Home()+"\convert.Fll") Additive
Endif

to the main.prg but the same error still happens.

where is the right place to add the convert.fll?

is there any way to to get the printersize number besides struct.vcx?

regards,

Jerry