There is a bug on Intel Macs whereby calling FSResolveAlias with a
fromFile to do a relative resolve will cause the aliases' userType
field to be swapped.
For example, given the following code:
FSRef XcodeRef;
if (FSPathMakeRef((const UInt8*)("/Developer/Applications/
Xcode.app"), &XcodeRef, nil) == noErr)
{
FSRef prefsRef;
if (FSFindFolder(kUserDomain,kPreferencesFolderType,true,&prefsRef)
== noErr)
{
AliasHandle alias = nil;
if (FSNewAlias(&prefsRef,&XcodeRef,&alias) == noErr)
{
const OSType myType = 'parC';
SetAliasUserType(alias, myType);
OSType typeAfterSetting = GetAliasUserType(alias);
if (typeAfterSetting != myType)
printf("userType has been mashed setting it!.\n");
else
printf("userType has survived being set.\n");
FSRef resolvedRef;
Boolean wasChanged;
if (FSResolveAlias(nil,alias,&resolvedRef,&wasChanged) == noErr)
{
OSType typeAfterNonRelativeResolve = GetAliasUserType(alias);
if (typeAfterNonRelativeResolve != typeAfterSetting)
printf("userType has been mashed by the non-relative resolver.
\n");
else
printf("userType has survived the non-relative resolver.\n");
if (FSResolveAlias(&prefsRef,alias,&resolvedRef,&wasChanged) ==
noErr)
{
OSType typeAfterRelativeResolve = GetAliasUserType(alias);
if (typeAfterRelativeResolve != typeAfterNonRelativeResolve)
printf("userType has been mashed by the relative resolver.\n");
else
printf("userType has survived the relative resolver.\n");
}
}
DisposeHandle((Handle)alias);
}
}
}
The output on an Intel mac will be:
userType has survived being set.
userType has survived the non-relative resolver
userType has been mashed by the relative resolver
Matt Gough
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