How to add 'ff ff ff ff' (HEX) before the data of an byte[] array?

Question

I am currently programming an emulator for a multiplayer game.
The client sends this to the server: ÿÿÿÿ2joinParty 61586 110000140b9f842 1 1 0 -1 1 pw 1.
My program sends joinParty 61586 110000140b9f842 1 1 0 0 1 pw 1 to the server.
Now when I make it send the ÿÿÿÿ's with it, it sends instead of ff ff ff ff, 3f 3f 3f 3f. Almost all packets require that ff ff ff ff, or else the server rejects the connections.

How can I add them?

see [Best way to combine two or more byte arrays in C#](http://stackoverflow.com/questions/415291/best-way-to-combine-two-or-more-byte-arrays-in-c-sharp) — M. Mennan Kara, Jul 30 '12 at 15:54

score 1 · Accepted Answer · answered Jul 30 '12 at 15:51

1

byte[] firstArray = new byte[] {0xFF,0xFF,0xFF,0xFF}; 
byte[] secondArray = [your data here]
byte[] result = firstArray.Concat(secondArray).ToArray();

answered Jul 30 '12 at 15:51

Robert Harvey

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Thanks! The only problem is now, when I try to convert 'ff ff ff ff' to an byte array, it returns null or gives me an error. I've tried multiple functions.. – Robin Jul 30 '12 at 15:56
3

What? The first line of code here creates a byte array filled with ff's. – Robert Harvey Jul 30 '12 at 15:57
Stupid me! Sorry, I'm a little bit sleepy.. I'll try it now. – Robin Jul 30 '12 at 16:11

How to add 'ff ff ff ff' (HEX) before the data of an byte[] array?

1 Answers1