No one from Apple needs to be listening and requesting help from Apple
employees for stuff like this is inappropriate on this list. You simply
don't understand how custom icons are implemented. We've had custom icons
for over 10 years and its not rocket science, and relatively easy to figure
out if you actually look at a file with a custom icon. Lots of applications
use them.
To add a custom icon to a file, you have to add an 'icns' resource with ID
-16455 to the file's resource fork. If it doesn't have a resource fork, then
you have to add one and then add the resource. The contents of the resource
are an IconFamilyHandle. See Icons.h for everything you'll need.
To add a custom icon to a folder, you have to create an invisible file named
"Icon\r" to the folder and do the above to this file.
Then you have to set the file or folder's custom icon Finder bit.
Larry
On 1/10/05 4:30 AM, Manish Pattath didst favor us with:
> I have a contextual menu plugin (XYZ.plugin) located
> at "/Library/Contextual Menu Items/". This
> is invoked when the user right-clicks on a
> file/folder. There are custom items in the contextual
> menu. Depending on the selection i need to provide a
> custom icon to the file/folder.
>
> In the Plugin Code i do something like this: I have a
> file abc.txt to which I need to give a custom icon.
> Now I get the IconRef of the file abc.txt and get the
> IconRef of the "bsd.icns" [Icon file] file and form a
> composite IconRef and apply this composite IconRef to
> abc.txt file.
>
> In my plugin i am forcing the finder to call my
> overrided function -
> SCFinderIconOverlayGetIconRefFromFileInfo when it
> makes a call to "GetIconRefFromFileInfo" by using
>
> mach_override("_GetIconRefFromFileInfo", NULL,
> SCFinderIconOverlayGetIconRefFromFileInfo,
> (void**) &gGetIconRefFromFileInfo);
>
> and the code for
> SCFinderIconOverlayGetIconRefFromFileInfo is here:
>
> static OSStatus
> SCFinderIconOverlayGetIconRefFromFileInfo(
> const FSRef * inRef, UniCharCount
> inFileNameLength,
> const UniChar * inFileName,
> FSCatalogInfoBitmap inWhichInfo,
> const FSCatalogInfo * inCatalogInfo,
> IconServicesUsageFlags inUsageFlags,
> IconRef * outIconRef,
> SInt16 * outLabel)
> {
> osStat = FSRefMakePath(inRef,szBuffer,MAX_PATH);
> osStat = FSPathMakeRef(szBuffer,&fsRef1,&bDir);
>
>
> if(strcmp(szBuffer,"/Users/Username/Desktop/Finder_OverlayIcon/abc.txt")!=0)
> {
> printf("FILE NOT MATCHING RET DEFAULT\n");
> err = gGetIconRefFromFileInfo(inRef,
> inFileNameLength,
> inFileName,
> inWhichInfo,
> inCatalogInfo,
> inUsageFlags,
> outIconRef,
> outLabel);
>
> return noErr;
> }
>
>
> osStat = FSGetCatalogInfo (&fsRef1,
> inWhichInfo,
> &fsInfo1,
> &hfsUni1,
> &fsSpec1,
> NULL);
>
> //finder info for incoming file
> finderInfo.fdCreator = kUnknownType;
> finderInfo.fdType = kUnknownType;
> newErr = FSpGetFInfo( &fsSpec1, &finderInfo );
>
> //Incoming file's icon for background.
> err = gGetIconRefFromFileInfo(inRef,
> inFileNameLength,
> inFileName,
> inWhichInfo,
> inCatalogInfo,
> inUsageFlags,
> &backgroundIconRef,
> outLabel);
>
> //bsd.icns file's icon for foreground.
> osStat =
> FSPathMakeRef("/Users/Username/Desktop/Finder_OverlayIcon/bsd.icns",&fsRef,&bD
> ir);
> osStat = FSGetCatalogInfo (&fsRef,
> inWhichInfo,
> &fsInfo,
> &hfsUni,
> &fsSpec,
> NULL );
>
> //even using the finderInfo.fdtype &
> finderInfo.fdCreator is not useful.
> newErr =
> RegisterIconRefFromFSRef(kUnknownType,kUnknownType,&fsRef,&foregroundIconRef);
>
> //the composite of the foreground and the background
> icons.
> newErr = CompositeIconRef(backgroundIconRef,
> foregroundIconRef, &compositeIconRef);
>
> *outIconRef = compositeIconRef; //send the composite
> as the icon to be displayed for the abc.txt file
>
> //decrement the reference count of back & foreground
> Icons.
> //cleanup
>
> return noErr;
> }
>
> On testing, to my astonishment, all the files with
> file extension ".txt" have a composite Icon while only
> abc.txt should have the composite and the rest of the
> .txt files should have their original icon. What wrong
> am i doing here? Pls note that in the
> SCFinderIconOverlayGetIconRefFromFileInfo function of
> the plugin, i return the original icon if the file is
> not abc.txt.
> When i log the results, for all other files other than
> abc.txt the SCFinderIconOverlayGetIconRefFromFileInfo
> returns the default icon and composite icon for
> abc.txt correctly.
>
> Can any one point what mistake am i doing? I have lost
> sufficient time on this. Also any one from Apple could
> help me?
>
> Thanks In advance.
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