Here are some useful private APIs for manipulating the Menu Extras currently in the menu bar:

typedef struct _OpaqueMenuExtra OpaqueMenuExtra; OSStatus CoreMenuExtraGetMenuExtra(CFStringRef identifier, OpaqueMenuExtra **menuExtraOut); OSStatus CoreMenuExtraAddMenuExtra(CFURLRef path, SInt32 position, void *_0, void *_1, void *_2, void *_3); OSStatus CoreMenuExtraRemoveMenuExtra(OpaqueMenuExtra *menuExtraIn, void *_0);

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I’m curious to know where these declarations come from. –boredzo

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It would appear to be from these mailing list posts: http://www.omnigroup.com/mailman/archive/macosx-dev/2001-October/032802.html http://www.omnigroup.com/mailman/archive/macosx-dev/2001-October/032806.html

� ElliottCable: http://elliottcable.name/

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Update: I had to modify the signatures to shut up some compiler warnings; I updated the above signatures to the ones that worked for me.

Note carefully! CoreMenuExtraGetMenuExtra() does take a metapointer to an _OpaqueMenuExtra, whereas CoreMenuExtraRemoveMenuExtra() takes a simple pointer: you must indirect one extra time for CoreMenuExtraGetMenuExtra(), as in the following example code (extracted from MacUIM: http://www.google.com/codesearch/p?hl=en#u6pAglFAHSU/trunk/Sources/MacUIMPrefPane.m&l=597 )

void *extra; if ((CoreMenuExtraGetMenuExtra((CFStringRef)extraID, &extra) == 0) && extra) CoreMenuExtraRemoveMenuExtra(extra, 0);