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Snoop the Serial Stream of an Ext. App.

Posted on 1998-11-16
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Last Modified: 2010-04-30
I often have to decode down/upload serial protocols for various PLC and factory automation equipments. Currently I use an external cable box that picks up the transmit/recieve lines and actively Or's the two together. The combined signals are then sent to the RX line of a second serial port where another app reads the data and stores it to a file for post analysis.
I would like to build a Win95 VB app using MSCOMM (or anything else) that accomplishes the same internally i.e. it must capture the serial data from a serial port that is being sent by another process (Usually a DOS app in Win95). The data rates are as high as 56K baud.
Is there any way of watching another process's serial communication in code.  
The simpler the better !
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Question by:jkears
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Expert Comment

by:Mirkwood
ID: 1444990
Www.sysinternals.com has a tool called portmon. This will do that for you. Most likely they install a system driver. So don't count on an easy or VB solution.
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Author Comment

by:jkears
ID: 1444991
To Mirkwood, I tried the address www.sysinternals.com but I got no response, is there a type-o mistake ?
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Expert Comment

by:Mirkwood
ID: 1444992
try 206.155.164.136. That is their IP address
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Author Comment

by:jkears
ID: 1444993
To Mirkwood,

Thanks for your information, however they only have a Windows NT version, I require this for Windows 95.


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Expert Comment

by:Mirkwood
ID: 1444994
No, they have a win95 version as well. Look under win95 utilities.
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Expert Comment

by:RUSH
ID: 1444995
check out socketspy32 or adapt-a-spy  from win-tech
http://www.win-tech.com/monitor.htm
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Author Comment

by:jkears
ID: 1444996
Rush,
I already have a package that monitors external transmit and recieve.  That is what Listen does.  What I want to do is to monitor any applications serial send and receive data stream.  

Mirkwood,
You have the right idea, but I can not find a Win95 version of portmon, only an WinNt version.

Anyone else have some ideas ?
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Expert Comment

by:RUSH
ID: 1444997
Check Socketspy...not the listen32 app.
Socket-spy monitors internally by hooking the windows api.
They also have spytools (an .exe and a .dll) available for download.
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Accepted Solution

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RUSH earned 100 total points
ID: 1444998
check out http://www.spywindows.com

they have a prog called comspy98
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