How to send big endian to network stream using c#

Question

I try to transfer a filedata with sockets via a sslStream. It seems that I must send the file data length before the data. The problem is that the code

Byte [] size = BitConverter.GetBytes(fileData.Length)

Returns in little endian but internet protocols are using big endian.

How I can convert this to big endian and write it to stream;

Possible duplicate of How to get little endian data from big endian in c# using bitConverter.ToInt32 method? — Umut Seven
– Umut Seven, Commented Dec 10, 2015 at 12:42

Sergii Zhevzhyk · Accepted Answer · 2015-12-10 13:14:50Z

2

I assume that you want to send just one int value. The order of the bytes should be reversed before transmitting:

byte[] bytes = BitConverter.GetBytes(fileData.Length);
if (BitConverter.IsLittleEndian)
     Array.Reverse(bytes);

Check this MSDN page to get more information about BitConverted.

You could also convert it using HostToNetworkOrder, for example:

int reversed = IPAddress.HostToNetworkOrder(fileData.Length);
byte[] bytes = BitConverter.GetBytes(reversed);

To send these bytes use the Write method:

stream.Write(bytes, 0, bytes.Length);

edited Dec 10, 2015 at 13:14

answered Dec 10, 2015 at 12:43

Sergii Zhevzhyk

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