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Re: [PROGRAMMERING] Re: perl binær konvertering



Adam Sjøgren wrote:

> On Wed, 06 Jul 2005 18:45:34 +0200, Rune wrote:
> 
>> Jeg har gemt en fil fra et C-program hvor jeg har gemt en masse floats.
>> Før jeg gemte floats'ne konverterede jeg dem med reinterpret_cast<long>
>> og derefter med ntohl for at få gemt dem som big-endian. Kan man i perl
>> trække dataen ud igen dvs anvende hvad der svarer til htonl og derefter
>> reinterpret_cast<float> ?
> 
> Måske ved hjælp af 'pack'/'unpack'?
> 
> Alt efter hvad din definition af "en masse" er, kan det være nemmere
> at lave et C-program der spytter tallene ud i plain text - da perldoc
> -f pack si'r:
> 
>  "*       Real numbers (floats and doubles) are in the native
>           machine format only; due to the multiplicity of floating
>           formats around, and the lack of a standard "network"
>           representation, no facility for interchange has been made.
>           This means that packed floating point data written on one
>           machine may not be readable on another - even if both use
>           IEEE floating point arithmetic (as the endian-ness of the
>           memory representation is not part of the IEEE spec). See
>           also perlport."
> 
> 
>   Mvh.
> 

Jeg tror jeg laver et lille c-program. 

Tak for den hurtige hjælp 



 
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