background-process

问题 I am developing an iOS app which receives apple's remote push notifications at a particular time interval. The notifications are received successfully when app is active as well as when app is in background. But when app is terminated from app switcher/dock, notifications are not received until the app is started again. I have tried following code to keep app alive in background. This same code is implemented in applicationWillTerminate: method, but it did not work. __block

问题 I'm looking for a way to refresh feed caches in the background. To demonstrate the issue I'm facing with, the below code would help. It renews the cache in every 30 seconds when the page is accessed and loaded. Since it has lots of urls to fetch at once, it gets really slow when the cache needs to be rebuild. $urls = array( 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&output=rss', 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&topic=w&output=rss', 'http://news.google.com/news

问题 I'm looking for a way to refresh feed caches in the background. To demonstrate the issue I'm facing with, the below code would help. It renews the cache in every 30 seconds when the page is accessed and loaded. Since it has lots of urls to fetch at once, it gets really slow when the cache needs to be rebuild. $urls = array( 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&output=rss', 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&topic=w&output=rss', 'http://news.google.com/news

问题 I'm looking for a way to refresh feed caches in the background. To demonstrate the issue I'm facing with, the below code would help. It renews the cache in every 30 seconds when the page is accessed and loaded. Since it has lots of urls to fetch at once, it gets really slow when the cache needs to be rebuild. $urls = array( 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&output=rss', 'http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&topic=w&output=rss', 'http://news.google.com/news

问题 I just started working on an application for Android, to be specific - a service. I would like to create a service (background service, forcing itself to run, hidden, so it can't be shut down). and I don't have idea on how to construct it. How it is then launched and how to make it fit to those requirements. It needs to start running from the Android start, so I guess it would be created similarly to system services (or as a system service). You may ask why I need that - I would like it to

问题 I have been looking at the "find my iPhone" app and it seems like it is using iCloud and no push notification to receive a alertView about a notification. By having some mechanism in the background running and alerting the user once it receives a notification. What I am wondering is that is this app a special exception Apple made for this app, and all other apps have to do push notification? Or can I make an app that runs in the background just like the "find my iPhone" app and communicate

问题 I have a linux machine with a data folder and a script that produces a report xlsx spreadsheet file on the ever changing content of the folder where it is being run. I use a xlsx2tsv script to convert it to tsv text which takes less than one second. The script takes about 1 minute to produce the spreadsheet file and I want to have a terminal screen showing the results of the table in a GNU less buffer, where I can move around with the cursors, and search for content with /search , etc. of the

问题 My app allows users to access a service that plays audio books via the web. I am using a UIWebView to handle this. When the app is exited or the device is put to sleep, the audio stops playing. Since I am just displaying the web view not playing the audio file directly, I cannot use those methods to play the audio in the background. However, if you access the same link via the Safari app, the audio keeps playing after the phone is put to sleep. How can I achieve the same effect in my app? 回答1

问题 I have seven licenses of a particular software. Therefore, I want to start 7 jobs simultaneously. I can do that using '&'. Now, 'wait' command waits till the end of all of those 7 processes to be finished to spawn the next 7. Now, I would like to write the shell script where after I start the first seven, as and when a job gets completed I would like to start another. This is because some of those 7 jobs might take very long while some others get over really quickly. I don't want to waste

问题 I have ffmpeg doing a video conversion in a PHP file and it works as it should. The problem is it takes up to a minute for this to finish. I thought it might be easy to do but I can only get it to work in the background when I use just one command (eg single pass conversion without mp4box) like this exec("nohup " . $ffmpegPath . " -i " . $srcFile . " -f mp4 -vcodec libx264 -crf 27 -s " . $srcWidth . "x" . $srcHeight . " -an -r 20 " . $destFile . ".mp4 > /dev/null 2>&1 &"); The problem is I