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Mac Forum / Programming / Mac Programming / March 2008Newbie: Application Question
Hi, I have written a small application in Python which seems to run ok, however I need to make sure that it continue to run even when the screensaver kicks in - at present it seems to go to sleep. Is there a way to ensure an application always runs? At the moment it is simply a standard application. I am also learning Cocoa and Objective-C right now if that helps. Thanks in advance. rod In article <b871658c-a69f-42c1-83dd-b8398e9415ae@e60g2000hsh.googlegroups.com>, > Hi, > [quoted text clipped - 5 lines] > > I am also learning Cocoa and Objective-C right now if that helps. Screen savers don't generally block other applications. What leads you to believe that your app "goes to sleep?" Is it possibly just running slower because whatever screen saver you've got selected is just a bit too powerful for your machine? Are you sure the whole machine isn't going to sleep (is there really a screen saver obviously running or are you just seeing a black screen)? > Screen savers don't generally block other applications. What leads you > to believe that your app "goes to sleep?" Is it possibly just running > slower because whatever screen saver you've got selected is just a bit > too powerful for your machine? Are you sure the whole machine isn't > going to sleep (is there really a screen saver obviously running or are > you just seeing a black screen)? Thanks for your reply. It's one aspect which seems to fail. Basically it a module which is responsible for the bulk uploading of files and it relies on an FTP connection. It seems the FTP connection is dropped when the screensaver kicks in, or the system is out of use for a while. It's odd I had similar problems with network reliant software on an iBook sometime ago. Best, rod In article <94273c32-3db2-4a5f-8741-4f14a332acd0@h11g2000prf.googlegroups.com>, > > Screen savers don't generally block other applications. What leads you > > to believe that your app "goes to sleep?" Is it possibly just running [quoted text clipped - 9 lines] > while. It's odd I had similar problems with network reliant software > on an iBook sometime ago. NSURLConnection by default is only registered in the default runloop mode. If you want it to run when a screen saver is up, you need to either be running in a separate thread, or use the 10.5 only calls to specify which runloop modes are OK for it. > In article > <94273c32-3db2-4a5f-8741-4f14a332acd0@h11g2000prf.googlegroups.com>, [quoted text clipped - 17 lines] > either be running in a separate thread, or use the 10.5 only calls to > specify which runloop modes are OK for it. Can you expand on that, or provide a pointer to more detail? I wasn't aware that the screen saver invoking would trigger a change in the run loop mode of other apps and haven't so far found details or even confirmation via Google. > Can you expand on that, or provide a pointer to more detail? I wasn't > aware that the screen saver invoking would trigger a change in the run > loop mode of other apps and haven't so far found details or even > confirmation via Google. Thanks to both of you for answering my initial question. Will this also apply in a Python app? best, rod In article <9520868e-f28f-4bd3-b440-acc8fdbe41bd@e25g2000prg.googlegroups.com>, > > Can you expand on that, or provide a pointer to more detail? I wasn't > > aware that the screen saver invoking would trigger a change in the run [quoted text clipped - 3 lines] > Thanks to both of you for answering my initial question. Will this > also apply in a Python app? Unless the interpreter goes out of its way to notice that ScreenSaverEngine is running and modify its behavior on its own, yes. A process is a process. The language doesn't really change anything fundamental about how it interacts with other processes. > In article > <9520868e-f28f-4bd3-b440-acc8fdbe4...@e25g2000prg.googlegroups.com>, [quoted text clipped - 11 lines] > process is a process. The language doesn't really change anything > fundamental about how it interacts with other processes. Fair point, and thanks for your help. I actually managed to trace what I think is the problem to the use of the Python OS module, in particular commands to move, copy or remove files. When run outside a threading environment they are ok, however the minute they are inside a thread things seem to go wrong - even when a lock is applied. Rod > > NSURLConnection by default is only registered in the default runloop > > mode. If you want it to run when a screen saver is up, you need to [quoted text clipped - 5 lines] > loop mode of other apps and haven't so far found details or even > confirmation via Google. Yes: I was wrong about screensavers having any effect. I wrote a Cocoa test program: @implementation AppDelegate - (void)awakeFromNib { [[NSTimer scheduledTimerWithTimeInterval:1. target:self selector:@selector(fired:) userInfo:nil repeats:YES] retain]; } - (void)fired:(NSTimer *)timer { NSLog(@"%@", [NSDate date]); } @end Ran it, put up a screen saver, typed my username/password into the auth dialog box to clear the screen saver, and checked the log. No calls to NSLog were dropped. The presence or absence of a screen saver does NOT affect the default run loop mode of the front application. But, the test program will block the timer if you hold down the mouse button while the mouse cursor is in the app's menu bar. And, NSURLConnection will similarly pause, unless you use the new 10.5 calls to affect its runloop mode. |
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