Question

I have a function that takes an array as a parameter. The function then fills the array up with information of unknown length. So how would I create an array to store a message of unknown length? Because I can’t specify the size of the array since I don’t know the size of the message it is going to store.

Would this be valid?

byte [] array;
function (array);

And then the size of the array will be determined by the size of the message it is filled in?
If this isn’t possible how would I do this?

I need the array to be the exact size of the message it is filled up with, so I can’t just specify the array to be some random size big enough to fit the message.

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Additional, from a comment:

public int ReceiveFrom( byte[] buffer, int offset, int size, 
       SocketFlags socketFlags, ref EndPoint remoteEP ) 

Answer 1

About using

public int ReceiveFrom( byte[] buffer, int offset, int size, 
   SocketFlags socketFlags, ref EndPoint remoteEP ) 

You are supposed to use this in a loop. You are receiving parts of the total message (stream) at a time. Up to you to decide which part you need. Optionally shift the rest down and specify an offset in the next call.

byte[] buffer = new byte[1024];
ínt n;
do 
{
    n = ReceiveFrom(buffer, 0, buffer.Lenght, ...);

    if (n > 0)
        // process n bytes in buffer

} while (n > 0);