<div>
Take a look at this site. Maybe, it will help you:<br />
<a href="http://www.codeguru.com/network/commspy.shtml" rel="ugc">http://www.codeguru.com/network/commspy.shtml</a>
</div>


Take a look at this site. Maybe, it will help you:
http://www.codeguru.com/network/commspy.shtml [http://www.codeguru.com/network/commspy.shtml]

<div>
I guess, you can use CSocket in the client mode of this purpose. See the documentation in MSDN for CSocket
</div>


I guess, you can use CSocket in the client mode of this purpose. See the documentation in MSDN for CSocket

<div>
btw. the new address of codeguru<br />
is:<br />
<a href="http://codeguru.developer.com" rel="ugc">http://codeguru.developer.com</a><br />
<br />
the old address is no longer available.<br />
<br />
regards<br />
kishk91<br />

</div>


btw. the new address of codeguru
is:
http://codeguru.developer.com [http://codeguru.developer.com]

the old address is no longer available.

regards
kishk91


<div>
<div class="content wysiwyg-content">
I need to write an app which would listen to a certain port number, used by another program P (both running on my computer), and log all data passing through this port. My app must not interfere with P, and the only reason I need it for is to see what P is sending/receiving at this port. <br />
<br />
I do not even know if it's possible. Any suggestions on how I can do this ?
</div>
</div>


I need to write an app which would listen to a certain port number, used by another program P (both running on my computer), and log all data passing through this port. My app must not interfere with P, and the only reason I need it for is to see what P is sending/receiving at this port. 

I do not even know if it's possible. Any suggestions on how I can do this ?

Listen to a port

Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.