One thing I've done in the past is get the PID of the main app before launching
the helper, and pass it as a command line argument to the helper (or something
similar) when it's launched. The helper app then periodically polls for the
existence of that PID, and when it discovers it's no longer there, quits.
This is nice because it's resilient against crashes as well as normal
termination. Of course (assuming you have some communication pipe between your
helper and your main app), when your main app quits normally you should attempt
to inform your helper that it should quit. This is a good strategy to implement
in addition to that so that it can clean itself up after a crash.
-Matt
Sent from my iPhone
On Jul 12, 2012, at 10:27 AM, Robert Martin <robmar...@frontiernet.net> wrote:
> The best way? I have no idea… This is what I do, and it works.
>
> I store the path to my helper app in 'path', and do the following when my app
> is about to quit:
>
>
> //---------------------------------------------------------------------
> - (void)applicationWillTerminate:(NSNotification *)aNotification
> //---------------------------------------------------------------------
> {
> [super applicationWillTerminate:aNotification];
>
> AppleEvent tAppleEvent, tReply;
> AEBuildError tAEBuildError;
> ProcessSerialNumber currentProcessPSN;
> NSNumber *psnHi = nil;
> NSNumber *psnLo = nil;
>
> NSArray * runningApps = [[NSWorkspace sharedWorkspace]
> launchedApplications];
>
> for(NSDictionary * appInfo in runningApps){
> if( [path isEqualToString:[appInfo objectForKey:@"NSApplicationPath"]]
> ){
> psnHi = [appInfo
> objectForKey:@"NSApplicationProcessSerialNumberHigh"];
> psnLo = [appInfo
> objectForKey:@"NSApplicationProcessSerialNumberLow"];
> break;
> }
> }
>
> if(psnHi == nil) return;
>
> currentProcessPSN.highLongOfPSN = [psnHi unsignedIntegerValue];
> currentProcessPSN.lowLongOfPSN = [psnLo unsignedIntegerValue];
>
> OSStatus result = AEBuildAppleEvent( kCoreEventClass, kAEQuitApplication,
> typeProcessSerialNumber, ¤tProcessPSN,
> sizeof(ProcessSerialNumber),
> kAutoGenerateReturnID, kAnyTransactionID, &tAppleEvent, &tAEBuildError,"");
> result = AESend( &tAppleEvent, &tReply, kAEAlwaysInteract+kAENoReply,
> kAENormalPriority, kNoTimeOut, nil, nil );
> }
>
>
> --Rob
>
>
> On Jul 12, 2012, at 12:33 PM, Jerry Krinock <je...@ieee.org> wrote:
>
>> What is the best way to make a helper app quit when the associated main app
>> quits (or crashes)? No harm will be done if it keeps running for a minute
>> or so.
>>
>> Thanks,
>>
>> Jerry Krinock
>
>
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