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sharing comm ports

Posted on 1998-10-14
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Last Modified: 2010-04-30
I need to intercept the comm1 port to read some messages which are send to another application, I am not aloud to join comm1 with another input, which is the easier form to do that, so I need to reed directly from comm1 which is already open,  I can't open a port already open so how can I skip this error?
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Question by:ftg
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5 Comments
 
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Accepted Solution

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david_levine earned 200 total points
ID: 1439923
2 programs can't have the same comm port open. The 2nd program will get an "in use" error.

If you are the developer of both applications, and you want input on the same comm port to go to 2 different applications, you would have to write a 3rd program which owns the comm port and somehow communicates the appropriate data to whichever program should receive the input.
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Author Comment

by:ftg
ID: 1439924
Dave.
 I can't touch one of the applicatios, I know that oppen a port twice is a mistake, so the question is how can I cheat the compiler to run the program despite this error?
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Author Comment

by:ftg
ID: 1439925
Dave.
 I can't touch one of the applicatios, I know that oppen a port twice is a mistake, so the question is how can I cheat the compiler to run the program despite this error?
0
 

Author Comment

by:ftg
ID: 1439926
Dave.
 I can't touch one of the applicatios, I know that open a port twice is a mistake, so the question is how can I cheat the compiler to run the program despite this error?
0
 
LVL 9

Expert Comment

by:david_levine
ID: 1439927
You can't have 2 programs accessing the same comm port. There's no way to cheat it. You could always put in another modem / line in the same computer. What's are the programs? Why do you want to do this?
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