I've just been looking more - and ParseFromString should do the job.
I /suspect/ the problem is the definition a "string"... you aren't
going to be able to treat raw binary in .NET as a String; you are
going to have to treat it as a Stream or a byte, or you can encode
it to base-64 (as above) to get something that *can* be treated as a
Either as binary or a base-64, you would then transfer that to the
server. At the server, ProtoBuf again expects raw binary, but in a C++
string (if you have used base-64 as a transfer mechanism, you would
have to decode the base-64 back to binary). You should then be able to
mount that data into a C++ string (or an istream).
My best guess is that at the moment you are losing data during
transfer (as above).
What mechanism are you using to transfer the data? If it is a network
socket (for example) you should be able to just send binary, without
ever touching a .NET string; likewise HTTP can be used without
creating a .NET string.
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