Re: Quit helper app when main app terminates
Re: Quit helper app when main app terminates
- Subject: Re: Quit helper app when main app terminates
- From: Matt Patenaude <email@hidden>
- Date: Thu, 12 Jul 2012 10:40:28 -0700
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 <email@hidden> 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 <email@hidden> 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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