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CRC32 returns negative on big files
Message
From
01/08/2011 03:53:17
 
 
General information
Forum:
ASP.NET
Category:
Coding, syntax and commands
Environment versions
Environment:
VB 9.0
OS:
Windows 7
Network:
Windows 2003 Server
Database:
MS SQL Server
Application:
Web
Miscellaneous
Thread ID:
01519635
Message ID:
01519780
Views:
14
>>>>>>>>(1) The short way is to cast the return result to UInteger, and change the return type of GetCrc32() to UInteger
>>>>>>>
>>>>>>>This line cannot be changed to UInteger:
>>>>>>>
>>>>>>>
>>>>>>>        Dim lnCRC32Result As Integer = &HFFFFFFFF
>>>>>>>
>>>>>>>
>>>>>>>It would give an error: "Constant expression not representable in type 'UInteger"
>>>>>>
>>>>>>Yes, it seems vb interpretes those as signed
>>>>>>
>>>>>>http://msdn.microsoft.com/en-us/library/s9cz43ek.aspx
>>>>>>
>>>>>>Append the type to the constant. U and I
>>>>>>
>>>>>>    Dim lnCRC32Result As UInteger = &HFFFFFFFFUI
>>>>>>
>>>>>
>>>>>There you go! Thx, didn't know that syntax existed :-{
>>>>
>>>>Well, you know more vb than I do -
>>>I know VB just well enough to work with it where it maps pretty straightforwardly to C# and that's about it.
>>>>I just googled my way through
>>>And I was too lazy :-}
>>
>>
>>I just had the impression you were not in favour of unsigned types ;)
>
>As in my post to Michel this AM - for the case in point I just think Int32 is preferable ....


Yeah, I read that post

The data is the same, it's just the way looking at it that differs

Michel did not want negative numbers, hence the suggestion to use unsigned

And thinking about it - there must be a reason why unsigned was invented
Gregory
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