Creating a C # file from a .proto file using protogen at the pre-build stage

We used protobuf for some time at work, and I decided to write a small console application for the client that would allow them to do some testing on the site.

I started a new C # console application and downloaded google.protocolbuffers and protobuf-net from nuget.

What I'm trying to do is turn the "messages.proto" file into "messages.cs"

I tried to get protobuf to create a message file at a pre-build event, but without success, it seems that the command parameters have changed since our first implementation. I followed suit here

http://code.google.com/p/protobuf-csharp-port/wiki/ProtoGen

And added the following build event

"$(projectdir)packages\Google.ProtocolBuffers.2.4.1.473\tools\protogen.exe" --proto_path=./protos protos/messages.proto --include_imports -output_directory=./

However, I get the following error

Input file protos/messages.proto doesn't exist.

, . ? !