Python Twisted frameowrk transport.write to a c# socket BeginReceive reading length based message framing value

Question

I'm using length based message framing with python twisted framework with a C# client running BeginRecieve async reads and I'm having trouble grabbing the value of the length of the message.

This is the twisted python code

self.transport.write(pack(self.structFormat, len(string)) + string)

And this is the C# code:

int bytesRead = client.EndReceive(ar);

if (bytesRead > 0) { int msg_size = BitConverter.ToInt32(state.buffer, 0);

Problem is the len(string) value is not correct when I grab it via Bitconverter on the c# side. The value should be 15 but its coming across as 251658240.

Any insight would be much appreciated.

Answer 1

Sorry the question was badly asked. I did find the solution though.

int netmsg_size = BitConverter.ToInt32(state.buffer, 0);

int msg_size = IPAddress.NetworkToHostOrder(netmsg_size);

This converts the network integer back into a regular integer.