problem with ReadByte() function

patrick88 · Post by **patrick88** » Sat May 03, 2003 10:36 am

if you would read a value superior at 127, the function ReadByte()
take a nÃ©gative value . 8O
for example reading 128 take -128, cool

my solution :

Code: Select all

octet = ReadByte()
If octet<0
   octet = 128+(128+octet)
EndIf

enjoy

GPI · Post by **GPI** » Sat May 03, 2003 11:07 am

No bug or something like this.

Bytes are signed, so they have a range from -128 to 127

to convert them to 0 to 256, simple use this

b.b=-100
l.l=b&$ff

Danilo · Post by **Danilo** » Sun May 04, 2003 7:38 pm

Code: Select all

octet = ReadByte() & $FF

Thats exactly what patrick88 wanted to say

GPI · Post by **GPI** » Sun May 04, 2003 7:52 pm

Danilo wrote:
Code: Select all
octet = ReadByte() & $FF
Thats exactly what patrick88 wanted to say

No it isn't.
and & operation is shorter to write and should be faster than an if and add.

Danilo · Post by **Danilo** » Sun May 04, 2003 9:44 pm

You dont get it, GPI - as always... :roll:

GPI · Post by **GPI** » Sun May 04, 2003 11:16 pm

Yes i like you too.