>>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
>>

>
>Thanks, in regards to that issue, yes, it does allows to define UInteger with HEX values.


Right. Concerning the negative/positive matter. It's the structure of the bits that matters, not whether you look at it as signed or unsigned

In Foxpro

	xx = repl(chr(0xff), 4)
	crc32 = sys(2007, m.xx,-1,1)
	
	?crc32  && 4294967295
	?vartype(crc32)  && C
	
	?int(val(crc32))  && 4294967295
	
	&& Force a signed 32 bit integer
	?bitor(int(val(crc32)), 0) && -1