How do I find out what process opened what port?

I want a method of finding out what process opened what port without the aid of an external application. I.e. no netstat or other tools like 开发者_如何学Pythonit.

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You need to use the IP helper functions. More specifically GetExtendedTcpTable and GetExtendedUdpTable.

For example, for GetExtendedUdpTable, you can pass in MIB_UDPTABLE_OWNER_PID as the TableClass and you will be able to receive the PID of the process that issued the call to bind for the UDP endpoint.