Is Winpcap captures and modifys data?

Question

I am working on project that can capture the data passed from the user to the network in the same machine and modify its contents.

But I don't know if Winpcap can only capture or can also modify the data???

I hope my question was so obvious for you!

Answer 1

You can capture. You can modify what you capture, but that doesn't affect what goes through the network stack: only what you have in your own sniffing process. You can't filter packets out either.