Re: Hex IP to string
Re: Hex IP to string
- Subject: Re: Hex IP to string
- From: Manuel Darveau <email@hidden>
- Date: Wed, 20 Mar 2002 18:54:24 -0500
>
On Tuesday, March 19, 2002, at 08:56 PM, Manuel Darveau wrote:
>
>
> Hi!
>
>
>
> I want to convert an IP in the form of "0xffffff00" to 255.255.255.0
>
>
>
> I tried:
>
> long val;
>
> val = strtol([@"0xffffff00" cString], nil, 16);
>
> NSLog(@"%@:%ld", subnet, val);
>
> NSLog(@"Subnet:%ld.%ld.%ld.%ld", (val & 0xff000000) >> 24, (val &
>
> 0x00ff0000) >> 16, (val & 0x0000ff00) >> 8, (val & 0x000000ff));
>
>
>
> This work fine with hex like 0x00ffffff but when you enter 0xff000000 it
>
> seem to have an overflow.
>
>
>
> Anybody see what I am missing?
>
>
Make val an unsigned long instead of a long. Otherwise the left shifts
>
will propogate the sign bit whenever the sign bit is on. (The high bit.)
>
With signed values, 0xff00000000 >> 24 == 0xffffffff instead of
>
0x000000ff.
Hi!
Yeah, you are probably right but strtol return a long... I will try to find
something like strtoul...
Thanks!
Manuel Darveau
-MacKeeper
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