Re: Two Scary Mac Bugs (just in time for Halloween)

[Norman Palardy <npalardy@great-white-software.com>]

On 31-Oct-08, at 12:11 PM, Charles Yeomans wrote:

> On Oct 31, 2008, at 12:53 PM, Keith DeLong wrote:
>
> > Both of these bugs are consistently reproducible in Mac OS X10.4  
> > but not
> > 10.5:
> >
> > 1. If a sheet is open on a window, attempting to modally open a  
> > subsequent
> > dialog as a sheet silently fails.
> >
> > In our case we are confirming save changes when closing the sheet. No
> > problem in 10.5 or Win32 builds. OS X 10.4 builds silently miss the  
> > dialog,
> > allowing the code to continues and result in a NOE when testing the  
> > results
> > of the dialog.
> >
> >
> > 2. Looking up an Integer keys in dictionaries using Int64 values  
> > fail on OS
> > x 10.4:
> >
> > Dim i as integer = 2
> > myDictionary.Value( i ) = someString
> >
> >
> > Later on...
> > MyString = myDictionary.lookup( myField.text.Clong, "" )
> >
> > In 10.4 myString = ""
> > On 10.5 and Win32 myString = someString
> >
> > However, this works on all 3 platforms:
> >
> > Dim i as Integer = myField.text.CLong
> > MyString = myDictionary.lookup( i, "" )
> >
> > Hope this saves someone else some hassles,
>
> I reported a feedback like this in July.
>
> *********
> Dictionary lookup of 32-bit integer keys using a 64-bit integer  
> returns different result in PPC v. Intel.
> Steps to Reproduce:
>  dim X as Int32 = 43
>  dim Y as Int64 = 43
>
>  dim d as new Dictionary
>  d.Value(X) = true
>  dim b as Boolean = d.Lookup(Y, false)
>
> b is true in Intel builds, but false in PPC builds.
> *********

Actually this is not a bug. The internal hash of the two values is  
different.
Not unlike trying to use strings with different encodings fails for  
the same reason.
So the hash of "Hello" in US ASCII is different than "Hello" in UTF16.
Int32 hashes and int64 hashes are not the same even if they hold the  
same value

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