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How to use htons() function?


 
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# 1  
Old 03-06-2009
How to use htons() function?

Hi I am constructing an ICMP packet using C++ and want to convert sequence number into network byte order. I know we can use htons: here is my code:

struct ICMPheader
{
unsigned int seqence_no;
};

ICMPheader header;

header.sequence_no = htons (sequence_no++);

but it is giving error that sequence_no is not declared in this scope...


can anybody help with this ASAP..

Thanks,
# 2  
Old 03-07-2009
It doesn't understand you want to use sequence_no from inside that structure, you have to tell it which structure to use like header.sequence_no
# 3  
Old 03-21-2009
hi
sequence_no is the one of the parameter in the structure ..
i think you havent declared the sequence_no externally.
plz change the code as below


header.sequence_no = htons (header.sequence_no++);

if it is not working ... plz let me know
# 4  
Old 03-23-2009
Also -
htons takes an unsigned short as its argument.
On 32 bit systems an int is 32 bits, a short is 16bits. try htonl()

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