Check if a Mac OS X application is present - cocoa

Question

I recall there being a Cocoa framework or AppleScript dictionary to check if an Application bundle with a specific name is installed at all, anywhere on the computer.
How do I do this? Either Cocoa, AppleScript, or command line are useful to me.

Answer 1

You should use Launch Services to do this, specifically the function LSFindApplicationForInfo().
You use it like so:
#import <ApplicationServices/ApplicationServices.h>
CFURLRef appURL = NULL;
OSStatus result = LSFindApplicationForInfo (
kLSUnknownCreator, //creator codes are dead, so we don't care about it
CFSTR("com.apple.Safari"), //you can use the bundle ID here
NULL, //or the name of the app here (CFSTR("Safari.app"))
NULL, //this is used if you want an FSRef rather than a CFURLRef
&appURL
);
switch(result)
{
case noErr:
NSLog(#"the app's URL is: %#",appURL);
break;
case kLSApplicationNotFoundErr:
NSLog(#"app not found");
break;
default:
NSLog(#"an error occurred: %d",result);
break;
}
//the CFURLRef returned from the function is retained as per the docs so we must release it
if(appURL)
CFRelease(appURL);

Answer 2

From the command line this seems to do it:
> mdfind 'kMDItemContentType == "com.apple.application-bundle" && kMDItemFSName = "Google Chrome.app"'

Answer 3

You can also use lsregister.
on doesAppExist(appName)
if (do shell script "/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -dump | grep com.apple.Safari") ¬
contains "com.apple.Safari" then return true
end appExists
That's pretty fast and you can do it from other languages like Python quite easily. You would want to play around with what you grep to make it most efficient.