>>>>I want to write data to lpt1 port to control PCU customer display.
>>>>The only way to do using vfp native commands is "run copy fn lpt1"
>>>>but this is too low for disply control.
>>>>
>>>>So the only possibility is to use API.
>>>
>>>Did you try COPY FILE (filename) TO LPT1:
>>
>>I run (w95 osr2, vfp build 415)
>>
>>copy file c:\autoexec.bat to lpt1
>>
>>a message
>>
>>c:\vfp\lpt1 already exists, overwrite it?
>>
>> appears
>>If i choose Yes, an Invalid seek offset error occurs!
>>
>>Only
>>
>>!copy file c:\autoexec.bat to lpt1
>>
>>works, but this is TOO slow for PCU display and requires lpt1 to be captured.
>
>It's not a problem to remove 'overwrite' message (SET SAFETY), but Invalid offset signals something more serious. I use this way to print reports from files.

Edward, do you have and idea why copy file ... to lpt1 produces invalid seek offset error? I can't put it work. I use network printer.

"???" command with spooler and other print command will work.