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FabulaTech Forum Serial Port Solutions Serial Port Control (Moderators: Andrew, Sergey_Jarovski, Tim_GaliullinFT) Problem using virtual port with windows API Previous topic | Next topic
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sylvain2222
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Problem using virtual port with windows API
on: Dec 4th, 2006, 12:10pm 		Quote Quote  Modify Modify
I try to read from a virtual port using windows API method ReadFile (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/readfile.asp).
 
This method always return 0 byte received.
 
I successfully open the com port with : CreateFileA("COM8", 80000000h + 40000000H, 0, 0, 3, 0, 0)
 
I successfully call ReadFile from the port with : ReadFile(CMD:HandlePortComCommande, CMD:carac, 1, NbRead, 0), but nbRead always return with a value of zero.
 
Code works with other virtual port supplier and works with real com port.
 
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Andrew
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Re: Problem using virtual port with windows API
Reply #1 on: Dec 5th, 2006, 1:33am 		Quote Quote  Modify Modify
Could you please clarify, what our product do you use? As I understand you use Virtual Serial Port Control. You created virtual COM port and try to read from that COM port. Is it so?  
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Andrew Scott

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sylvain2222
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Re: Problem using virtual port with windows API
Reply #2 on: Dec 5th, 2006, 5:54am 		Quote Quote  Modify Modify
I'm using Virtual Serial Port Kit version 4.8.3, licensed.  I create COM7 and COM8, associated together. My application intend to receive data on COM8 (it can be another com port too).  
 
To test, I send data to com7 with hyperterminal, but my application always have a result of 0 byte read anytime. There is no error returned by called functions.
 
When I connect togother 2 physical com port with a null modem cable, com3 and com4 for example, it's working fine.
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Andrew
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Re: Problem using virtual port with windows API
Reply #3 on: Dec 5th, 2006, 6:16am 		Quote Quote  Modify Modify
Thank you for your detailed information. Could you please download the latest 4.8.9 version and try again. Awaiting your reply ...
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Andrew Scott

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sylvain2222
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Re: Problem using virtual port with windows API
Reply #4 on: Dec 5th, 2006, 6:55am 		Quote Quote  Modify Modify
So, I installed new version. Same problem. I tried something else : I change flow control from hardware to none. Working fine with this and with xon/xoff.
 
I don't know if I could have the same problem with older version.
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