Socket Programming

[LisaMargret]

Hello I am Developing an API in C#
which requires me to connect to a server and send and recieve data
i am able to create a socket
i need to send a data in the following Format (Protocol Frame)
<0x03><0x20><LLLL>Data....................<0x04>

i am able to do everything except the Lenght (LLLL) field which need to be 4 Bytes and should be in Big Endian Format
i tried doing everything but cudnt do it
i used host to network order method but didnt knew how to append it to the message i am supposed to send.
I'll appreciate any help on this issue


Thanks,
Lisa

[Plater]

Sockets just send a stream of bytes.
Create a byte[] and fill in the byte values?


Note: I may have LLLL using the wrong << vs >> and it might need to count up not down.

byte[] myarray = new byte[7+LLLL];
 
myarray[0]=0x03;
myarray[1]=0x20;
 
myarray[2]=  (byte)((Int64)(LLLL<<24));
myarray[3]=  (byte)((Int64)(LLLL<<16));
myarray[4]=  (byte)((Int64)(LLLL<<8));
myarray[5]=  (byte)(LLLL)
 
//fill in the rest with your data
 
myarray[7+LLLL]=0x04;
 

Also, it would probably be much easier if you made this a function that returned a byte[] and took in like a length and some data.

[setiarakesh]

Dear Lisa,

On reciving end

for the String "<0x03><0x20><LLLL>Data....................<0x 04>"

byte b[];
byte a[];
a[0]=b[13];
a[1]=b[14];
a[2]=b[15];
a[3]=b[16];

Since it is big endian so actual value will be iht string form will be.

String lengthStr= ConvertintoString(a[3]) + ConvertintoString(a[2]) + ConvertintoString(a[1]) + ConvertintoString(a[0])

int x= ConvertIntoInteger(lengthStr)

This x would give you the length now in interger form.

Rakesh Setia