>I added mscomm32.ocx to the class, and I copied the code to cmdbutton.click:
>
> PUBLIC ComForm
> ComForm = CREATEOBJECT('Form')
> ComForm.AddObject("Testcom","Olecontrol","MSCOMMLib.MSComm")
> ComForm.Testcom.CommPort = 2 && Use Comm2, The second Serial Port.
> ComForm.Testcom.Settings = "14400,N,8,1" && 14.4 Kbaud, No Parity,
> && 8 data Bits, 1 Stop Bit
> ComForm.Testcom.PortOpen = .T.
> ComForm.Testcom.Output = "ATDT555-1234" + chr(13) && Dialing the number
> * The chr(13) is needed to complete the modem command sequence
> ComForm.Testcom.PortOpen = .F.
> ***** End Code *****
>
>when I compiled, I got error:
>
>ERROR#: 15
>Not a table
>ComForm.Testcom.PortOpen = .F.
>
>am I missing something?

Not that I can see from your sample.
ComForm is an instance of your Form (shouldn't be Public except for testing from the Command Box BTW).
The you add MSCOMM as an object to the form.
Does it crash in the last line you showed but works when doing the settings until then? IOW, is ComForm.Testcom instantiated succesfully as an object?
For debugging purposes ad lines to show the result of VARTYPE(ComForm.Testcom) as "O" or better yet run it line by line in the debugger.