--- In [email protected], Sanil P S <[EMAIL PROTECTED]> wrote:
>
> atoi will not work here.
>
> atoi just converts the string to integer.
> ie; 4 bytes string like "1234" = 1234
>
> check the ASCII values for 1, 2 ,3 and 4
> whcih are 49,50,51,52 corresponding hex values
> are 31,32,22,34
>
> Binary representation of this is
>
> 0011 0001 0011 0010 0011 0011 0011 0100 ==>Hex
> 31 32 33 34 ==> decimal 825373492
>
> I want to get
>
> Binary ===> Hex ===> decimal
>
> 00000001 00000001 0000001 00010000 ==>01 01 01 10
> ==>16843024
>
> 00000001 00000001 0000001 00011110 ==>01 01 01 1E
> ==>16843038
<snip>
In this case it does make sense to read() (or recv(), for that matter)
the four bytes as char*; however, processing goes on like this:
/* Check that four bytes can be read: */
if (read( ifd, chararr, sizeof( chararr)) != 4)
{ perror( "Couldn't read 4 length bytes");
exit( EXIT_FAILURE);
}
/* else */
/* Concatenate them into one long value: */
longvalue = ( ( (unsigned long) (chararr [0])) << 24) +
( ( (unsigned long) (chararr [1])) << 16) +
( ( (unsigned long) (chararr [1])) << 8) +
( (unsigned long) (chararr [1]));
[I know this is far too lengthy, but what the heck; it works, and
that's the most important thing to me. Also the compiler doesn't care
about the superfluous extra parentheses, so why should I; for me they
help to make things clearer and safer, so I use them.]
Regards,
Nico
