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Editorial Team
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Asked: 2026-05-12T11:04:10+00:00

I’m converting a Carbon app to a Cocoa app and I can’t find the

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I’m converting a Carbon app to a Cocoa app and I can’t find the Cocoa equivalent for:

UpdateSystemActivity(UsrActivity);

Any Mac people out there care to point me in the right direction? Thanks.

UPDATE: I’m building 64bit. Building 32bit works fine, but I get symbol not declared in this scope errors for UpdateSystemActivity (and others) when I build for 64bit.

UPDATE2: I’m importing the following:

#import <Cocoa/Cocoa.h>
#import <Carbon/Carbon.h>
#import <OpenGL/CGLMacro.h>

Is there some other thing I need to import when building 64bit?

UPDATE3: Adding #import <CoreServices/CoreServices.h> did not help. I still get compiler errors telling me UpdateSystemActivity and UsrActivity was not declared in this scope.

UPDATE4: Okay, file not found on OSServices/Power.h. I’m building against the 10.5 SDK and a quick search shows:

$ pwd
/Developer/SDKs
$ find . -name Power.h
./MacOSX10.3.9.sdk/Developer/Headers/CFMCarbon/OSServices/Power.h
./MacOSX10.3.9.sdk/Developer/Headers/CFMCarbon/Power.h
./MacOSX10.3.9.sdk/Developer/Headers/FlatCarbon/Power.h
./MacOSX10.3.9.sdk/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/OSServices.framework/Versions/A/Headers/Power.h

./MacOSX10.4u.sdk/Developer/Headers/CFMCarbon/OSServices/Power.h
./MacOSX10.4u.sdk/Developer/Headers/CFMCarbon/Power.h
./MacOSX10.4u.sdk/Developer/Headers/FlatCarbon/Power.h
./MacOSX10.4u.sdk/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/OSServices.framework/Versions/A/Headers/Power.h

./MacOSX10.5.sdk/Developer/Headers/FlatCarbon/Power.h
./MacOSX10.5.sdk/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/OSServices.framework/Versions/A/Headers/Power.h

Yet I get:

Mac.mm:6:29: error: OSServices/Power.h: No such file or directory
Mac.mm:6:29: error: OSServices/Power.h: No such file or directory
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1 Answer

  1. Editorial Team

    You should still be able to call UpdateSystemActivity from within your Cocoa app — it has not been marked deprecated.

    The documentation for the API specifies importing CoreServices/CoreServices.h to get the API — however hunting through the headers (notably in OSServices/OSServices.h) shows that the file is omitted in a 64bit environment. Nevertheless, there are sections of Power.h (where UpdateSystemActivity is defined) that are turned off for 64bits, and UpdateSystemActivity is not one of them.

    In light of that, try to #import <OSServices/Power.h> directly and see if that works. (You’ll have to include the CoreServices framework in your project for the header to be found as well.)

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