Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Intercept serial port communication

Posted on 2001-08-06
7
Medium Priority
?
439 Views
Last Modified: 2013-11-15
Hi,

Because I want to understand the protocol in which an application "talks" to external hardware, I need to have a program which intercepts the "talking" and dumps it to a file.

The program must sit and wait until another program writes or retrieves data to or from the COM1: port (it has to run on a Windows 2000 machine).

Is this possible in VISUAL C++ (or in any way at all?). If such a program already exists, please say where I can get it!

Thnx in advance,

Bart van der Vliet
trance_creator@zonnet.nl
0
Comment
Question by:trance_creator
  • 3
  • 3
7 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 6356018
>>Is this possible in VISUAL C++ (or in any way at all?).

You can always do that usina API hooking - see http://research.microsoft.com/sn/detours/ and http://msdn.microsoft.com/msdnmag/issues/1000/vtrace/VTrace.asp on this issue.

BTW: A great tool that already does what you want to is http://www.sysinternals.com/ntw2k/freeware/portmon.shtml
0
 
LVL 1

Expert Comment

by:RideOn
ID: 6356084
You have to use following APIs CreateFile & ReadFile to Read from ComPort.
Do you only want to Read from it?
0
 
LVL 86

Expert Comment

by:jkr
ID: 6356140
>>You have to use following APIs CreateFile & ReadFile to
>>Read from ComPort.

But these APIs don't allow to intercept an ongoing communication...
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 1

Expert Comment

by:RideOn
ID: 6356174
oh yes, thats right
okay, want to know what i did?
i had to monitor the communication over COM1 Port.
I made a patch-cable that was 1:1:1, that means APLLICATION - COM1 - COM2

over COM1 i communicated with the APPLICATION and on COM2 i watched what's happening. I think that's a very easy and fast way to do that...
U can watch COM2 with a normal Terminal-Program like Windows Hyper Terminal...
0
 
LVL 86

Accepted Solution

by:
jkr earned 1000 total points
ID: 6356191
>>okay, want to know what i did?

Well, that works - but it's easier to use http://www.sysinternals.com/ntw2k/freeware/portmon.shtml 
0
 
LVL 1

Expert Comment

by:RideOn
ID: 6356247
that's maybe right...but you're a little restricted with that application...
but anyway, maybe it's enough for trance_creator...

grEEz RideOn
0
 

Author Comment

by:trance_creator
ID: 6358384
The program is exactly what I need! Thanks a lot!!!

TTYL,

Bart van der Vliet
0

Featured Post

Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you are like me and like multiple layers of protection, read on!
The main intent of this article is to make you aware of ‘Exchange fail to mount’ error, its effects, causes, and solution.
This video Micro Tutorial shows how to password-protect PDF files with free software. Many software products can do this, such as Adobe Acrobat (but not Adobe Reader), Nuance PaperPort, and Nuance Power PDF, but they are not free products. This vide…
Please read the paragraph below before following the instructions in the video — there are important caveats in the paragraph that I did not mention in the video. If your PaperPort 12 or PaperPort 14 is failing to start, or crashing, or hanging, …

885 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question