[Gambas-user] Hex string to float

[Doriano Blengino]

nando ha scritto:
> I'm sorry, but I cannot see this as correct.
> Saving a 4 byte value in integer format then
> reading in the same 4 byte value and place it in an float variable
> performs no conversion.
> Conversion is needed due to how we want to interpret the type of data.
>   
Indeed it does (perhaps a different syntax should be used - the one 
which writes in binary format). The problem is that it is easy to write 
an integer constant in the correct form (&h...); different is the case 
when you read them from somewhere - they can have a different byte order 
or format (in this case you can manipulate them).

Another problem is to use a file for doing this - this is a great waste 
of resources; gambas has pointers too, but they are difficult to use.

Regards,
Doriano
>
>
> ---------- Original Message -----------
> From: hjherbert at ...20...
> To: gambas-user at lists.sourceforge.net
> Sent: Sat, 13 Dec 2008 17:21:39 +0100
> Subject: Re: [Gambas-user] Hex string to float
>
>   
>> ... For 32 Float use the "Single" data type.
>> See http://gambasdoc.org/help/cat/datatypes
>> See http://gambasdoc.org/help/lang/type/single
>>
>> The example conversion may be done by this way:
>>
>> PUBLIC SUB DemoSingle()
>> DIM i AS Integer
>> DIM f AS Single
>> DIM hH AS File
>>
>> i = &h3fd55555&
>> OPEN "/tmp/hexfloat.tmp" FOR WRITE CREATE AS #hH
>> WRITE #hH, i
>> CLOSE #hH
>> OPEN "/tmp/hexfloat.tmp" FOR READ AS #hH
>> READ #hH, f
>> CLOSE #hH
>> PRINT "i=", i, "HEX", Hex$(i), "  f=", f
>> END
>>
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-- 
Doriano Blengino

"Listen twice before you speak.
This is why we have two ears, but only one mouth."