Packet with fixed size

[Hamed]

Hello,
I want to send "Hello World" to UDP server but with fixed size so I did:

socket.send("Hello World",256,udpServer1,port);
 

It send packet with size 256 byte but it fill empty part with random character but I need blank with in hex show I get 0000.

I use winSniff to check packets structure.

[Laurent]

It's not magic, if you want to send a 256 characters long string padded with zeroes, you must create this string.

Sending a string with less characters than the given size causes an undefined behaviour.

[Hamed]

I have hex code of this package can I convert it to string and send it?

[Laurent]

You can do whatever you want. If you a have a specific problem, please be more precise about it.