iphone - NSFileManager Can't retrieve files -

in method transmitdata, nsarray files coming nil. problem in code? save file (we hit [file writetourl: fileurl atomically: yes]) , call transmitdata, cannot retrieve files.

#import "filemanagerservice.h" #import "synthesizesingleton.h" @implementation filemanagerservice synthesize_singleton_for_class(filemanagerservice);  #define savevoter @"sv" #define savescript @"ss"  - (nsurl *)applicationdocumentsdirectory  { return [[[nsfilemanager defaultmanager] urlsfordirectory:nsdocumentdirectory   indomains:nsuserdomainmask] lastobject]; }  -(void)savefile:(nsdata*)file:(nsstring*)datatype { nsfilemanager *manager = [nsfilemanager defaultmanager]; nsurl *fileurl; nsstring *filename;  if (datatype == data_save_voter) {     filename = [nsstring stringwithformat:@"%@01",savevoter];     fileurl = [[self applicationdocumentsdirectory]urlbyappendingpathcomponent:filename];      int fid = 0;      while ([manager fileexistsatpath:[fileurl absolutestring]])      {         fid++;          filename = [nsstring stringwithformat:@"%@%d",savevoter,fid];         fileurl = [[self applicationdocumentsdirectory]urlbyappendingpathcomponent:filename];     }  } else if (datatype == data_save_script) {     filename = [nsstring stringwithformat:@"%@01",savescript];     fileurl = [[self applicationdocumentsdirectory]urlbyappendingpathcomponent:filename];      int fid = 0;      while ([manager fileexistsatpath:[fileurl absolutestring]])      {         fid++;          filename = [nsstring stringwithformat:@"%@%d",savescript,fid];         fileurl = [[self applicationdocumentsdirectory]urlbyappendingpathcomponent:filename];     }  }   [file writetourl:fileurl atomically:yes]; }   -(void)transmitdata { nsarray *files = [[nsfilemanager defaultmanager] contentsofdirectoryatpath:[[self applicationdocumentsdirectory]absolutestring] error:null];  if (files == nil || [files count] <= 0) {     nslog(@"no files transmit");     return; }  (id file in files)  {      nsdata * dt = file;     nsstring *str = [[nsstring alloc]initwithdata:dt encoding:nsutf8stringencoding];      nslog(@"datacontents: %@",str); } }  @end 

edit: upon more testing :

filename = @"testfile";     fileurl = [[self    applicationdocumentsdirectory]urlbyappendingpathcomponent:filename];          nslog(@"url1: %@",[fileurl absolutestring]); 

my log coming null. cant retrieve files because saving null file location....why happening?

fixed:

so have no idea why, [file writetourl:fileurl atomically:yes] not work , [[nsfilemanager defaultmanager] createfileatpath:fileurl contents:file attributes:nil]; work.

use

- (nsurl *)applicationdocumentsdirectory {     nsarray *searchpaths = nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes);     nsstring *documentpath = [searchpaths objectatindex:0];      return [nsurl fileurlwithpath:documentpath]; } 

and

nsarray *files = [[nsfilemanager defaultmanager] contentsofdirectoryatpath:[[self applicationdocumentsdirectory]path] error:null];