Invalid seek offset while opening COM port with fopen

[mshamz]

Hi,

When I run the following code in VFP 6, it gives me 'Invalid seek offset' error.

MyCOMPort = "COM2"
MyHandle = fopen(MyCOMPort,12)

This code runs fine with VFP 3.

Can anyone help me on this ?


Thanx and Regards,

Shamz
mshamz@hotmail.com

 

[DEDMOD]

This doesn't look like an error message which would be generated by the code you posted. Is there an fseek() in the code as well? And what service pack do you have on VFP 6? Finally, with the existance of COM and COM +, you might want to find another name for the file. Perhaps 'com2' has become a reserved word and VFP is getting confused. Dave Dardinger

 

[dgrewe]

The last time I saw that error,
The COM port was disabled in the BIOS.
David W. Grewe
Dave@internationalbid.com

 

[rgbean]

Trying to open COM ports with low-level IO really isn't a good idea. While it may work in Win 95 / 98 / SE / ME, it most likely won't work in Win NT / 2000 / XP. Instead you should use the MSCOMM32 control - there are a number of Knowledgebase articles with VFP examples, not to mention those in the sample code provided with VFP.

Rick

 

[mshamz]

Hi dgrewe,
I don't think this is a problem with the BIOS settings. Because when you run the command DIR > COM2, it prints on th COM port printer.

As I mentioned before, it could be a problem with Win95/98 and VFP6 combination. In Win2000 it is working fine.