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I need to monitor the number of open TCP connections held by a single process on a 64 bit Windows 7 machine from .NET 4.0.

This article describes the undocumented Win32 API method "AllocateAndGetTcpExTableFromStack" that accomploshes this task on 32 bit windows:

http://www.codeproject.com/KB/IP/iphlpapi.aspx?display=Print

But this fails on my machine (presumably because I am on 64 bit) with:

Unable to find an entry point named 'AllocateAndGetTcpExTableFromStack' in DLL 'iphlpapi.dll'.

How can we do this on 64 bit Windows?

Mike Chamberlain
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  • Have you seen this? http://stackoverflow.com/questions/570098/in-c-how-to-check-if-a-tcp-port-is-available – Brian Lyttle Mar 23 '11 at 03:57
  • @Mikey Cee undocumented Win32 API method "AllocateAndGetTcpExTableFromStack" [AllocateAndGetTcpExTableFromStack function](http://msdn.microsoft.com/en-us/library/windows/desktop/aa365804(v=vs.85).aspx) – bartolo-otrit Jan 27 '12 at 05:16

1 Answers1

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You might get a good start via System.Net.NetworkInformation. In particular, IPGlobalProperties.GetActiveTcpConnections.

However, you will find that this library does not expose the PID, so there is no way to narrow it down by the particular process associated with each connection. I'm guessing it will be much easier to simply parse the output of a console netstat -ano into a collection of managed objects, and use a simple LINQ query to pull out the specific connections you need based on process ID. However, I wouldn't recommend this if you're going to be doing it often, as it would be a very slow method.

You may also try the PInvoke for GetExtendedTcpTable() in the DLL you reference above. I don't have my x64 box to test, but it could be a simple deprecation of the particular function you're trying to call.

drharris
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  • Thanks, yes, the method is now called GetExtendedTcpTable(). I found a nice wrapper for it here: http://www.timvw.be/2007/09/09/build-your-own-netstatexe-with-c/ – Mike Chamberlain Mar 23 '11 at 04:49