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This Technical Note describes how to determine which folder on an HFS volume is
the blessed folder, that is, the folder that contains both the System file and the Finder.
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Note:
The following information may be effected by future changes to
system software. If you choose to use this information, you must do so at
your own risk.
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[Jan 01 1988]
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Blessing a Folder
The way to bless a folder is by taking the longword which is the directory ID of the
blessed folder and putting it into the Master Directory Block (MDB). This can be
accomplished by using the HFS call PBSetVInfo. You should not attempt
to change this block directly. First call PBHGetVInfo and set
ioVFnderInfo[1] to the directory ID of the new folder to
be blessed. Then call PBSetVInfo to save this information.
Once you have done this, you will find that the Finder takes a
little while to realize that you have blessed the folder.
Therefore, the icon will take a little while to change.
Exactly how long you will have to wait to see the new
icon is unknown.
Forcing the icon to change sooner is not a difficult task. The best way for you
to see the icon change more quickly is to change the modification date of the
directory into which you are copying the new System Folder. Doing this will
cause the Finder to reexamine the window and its contents. When the Finder
notices that the volume's modification date has changed, it begins scanning for
changes in all the open folders. This scanning process takes place about once
every 10 seconds. You can change the last modification date for that volume and
the System Folder's directory ID for that volume using PBSetVInfo.
Changing the file's FndrInfo or renaming the file does not change the
modification date. When you call PBSetVInfo you will need to put the
System Folder's directory ID in the longword at ioVfndrInfo. This
longword will be the first four bytes of this directory ID. (As usual,
whenever you make a change to a field of a structure you need to first
do a PBGetCatInfo, change what you are going to change, and
then do PBSetCatInfo. This ensures that you change only the
portion of the volume that you intended, in this case a longword,
and not the whole structure.)
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References
Master Directory Block: Inside Macintosh Volume IV on page 166.
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Change History
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01-Jan-1988
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The information about how to find the
"Blessed Folder" has been deleted from this technical note. The FindFolder
function can now be used to find the "Blessed Folder" and is documented in
Inside Macintosh Volume VI, pages 9-42 to 9-44. This note now includes
information about how to bless a folder to the new system folder.
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