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Object Browser and negative hex numbers
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General information
Forum:
Visual FoxPro
Category:
Other
Miscellaneous
Thread ID:
00596369
Message ID:
00596455
Views:
21
>>>I was looking for something in the object browser and notice following:
>>>Constant wdAlertsAll = -1
>>>Hex: -0x00000001, Bin: 11111111
>>>Member of Word (cached).WdAlertLevel
The part that get me curious is
Hex: -0x00000001
I never encountered negative hex numbers before. Shouldn't it be?
Hex: 0xff
>>
>>If it's a DWORD, then it should be 0xFFFFFFFF. The binary representation you show is only a byte. Generally, bytes are unsigned, words and dwords can be signed or unsigned. Why the representation the way it is, I can only guess.
>
>My best guess is that the key is defined as a signed 8-bit integer, and when treated as a UCHAR, is represented by the value 0xFF

Yep, I'd guess so. I think, as I mentioned in my other post to Sergey, that VFP interprets hex values as unsigned unless otherwise specified. Thus, -0x00000001 makes some sense.
George

Ubi caritas et amor, deus ibi est
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