objective c - Run Request In Background IOS -


i want run request while app in background.my app supports background mode -> background fetches.

but below code return failure while app in background! there way run request?i tried nsurlconnection receives response not receive response!

 [[afhttprequestoperationmanager manager]post:@"http://app.xxxx.com/message_delivery.php" parameters:@{@"message_id":msgid} constructingbodywithblock:^(id<afmultipartformdata> formdata) {       } success:^(afhttprequestoperation *operation, id response) {         nslog(@"succesfuly tik");     } failure:^(afhttprequestoperation *operation, nserror *error) {          nslog(@"%@",error);     }];

these code working not

  nsurl *url=[nsurl urlwithstring:[nsstring stringwithformat:@"http://app.xxxx.com/message_delivery.php?message_id=%@",msgid]];     nsurlrequest *request = [nsurlrequest requestwithurl:url                                               cachepolicy:nsurlrequestuseprotocolcachepolicy                                           timeoutinterval:2];     [[[nsurlconnection alloc] initwithrequest:request delegate:self]start];

background fetch specific technology lets os opportunistically call code, in turn calls web service see if there new data retrieve. don't have time perform request (30 seconds?). it's not intended substantive (or if is, you'd marry background fetch background nsurlsession, different technology). , when background fetch 1 of these opportunistic calls, call completion handler when you're done.

but 2 code samples don't show calling completion handler passed app delegate's performfetchwithcompletionhandler. i'm unclear whether you're doing background fetch , haven't shared relevant code, or whether you're conflating different technologies.

there 3 basic background networking approaches, each own pros , cons.

  • there background fetch, os initiate opportunistic network request @ time of own choosing;

  • there beginbackgroundtaskwithexpirationhandler, lets app continue running few minutes (nowadays 3 minutes) finish finite length tasks ... useful if you're starting network request know may take few minutes , don't want die because user left app; ,

  • there nsurlsession background nsurlsessionconfiguration, in ios daemon performs requests on behalf of app , lets upload , download requests might take longer (even after app has been terminated), waking app when done.

it's not clear me, on basis of description, of these applicable in case. when requests running in background, how precisely requests initiated , how long take, worst case scenario?

having said that, when doing background networking, consider shifting nsurlsession, opens additional opportunities. afnetworking, achieved afhttpsessionmanager (rather afhttprequestoperationmanager; it's little complicated see https://stackoverflow.com/a/21359684/1271826 discussion of configuring afnetworking background sessions). if doing yourself, it's using nsurlsession background nsurlsessionconfiguration rather using nsurlconnection.


Comments

Post a Comment

Popular posts from this blog

powershell Start-Process exit code -1073741502 when used with Credential from a windows service environment -

i'm running strange behavior powershell start-process call. here call: $process = start-process ` "c:\somepath\mybinary.exe" ` -passthru ` -credential $defaultcredential ` -wait ` -workingdirectory "c:\somepath" ` -loaduserprofile if ($process.exitcode -ne 0) { #do } this call return exit code - 1073741502 . after quick search, exit code seems related generic error when program not load required dll (aka. status_dll_init_failed ). when run without -credential $credential program runs correctly. in order isolate problem, manually launched some.exe in prompt target credential , runs smoothly. so problem seems come way start-process cmdlet launch process. i found potential solutions problem tried apply no luck : link , link . would have idea of what's going on here ? edit 1: run proc mon monitoring program activities when launched directly or via powershell script. problem seems occur when loading kernelbase
Read more

twig - Using Twigbridge in a Laravel 5.1 Package -

i'm trying create laravel 5.1 package uses twigbridge instead of .php views. can normal .php views display fine, when try make use of .twig templates i'm met error. possible use twigbridge templates when creating views laravel package or pretty stuck blade , php ? edit 1: loading twig template without extending works. it's when start using {% extends 'file' %} error comes out. i error error loading /virtual/laravel/packages/username/mypackage/src/views/sample.twig: template "templates.master" not defined () in "/virtual/laravel/packages/username/mypackage/src/views/sample.twig" @ line 1. my folders username |_ mypackage |_ src |_ controllers - samplecontroller.php |_ views |_ templates - master.twig - sample.twig twig template sample.twig {% extends 'templates.master' %} {% block content %} {{ parent()
Read more

c# - LINQ join Entities from HashSet's, Join vs Dictionary vs HashSet performance -

i have hashset's each stores t, have written test application compares different relation algorithms can think of, i'm not pleased results getting. does there exist more efficient ways of achieving object relations, once testing? using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.diagnostics; namespace linqtests { class program { static void main(string[] args) { hashset<user> usertable = new hashset<user>(); hashset<userproperty> userpropertytable = new hashset<userproperty>(); #region lets create dummy data. console.writeline("please wait while creating dummy data, can take while..."); console.writeline(""); int rows = 1000000; for(int x = 0; x < rows; x++) { random rnd = new random(); // ad
Read more