objective c - NSFilemanager doesn't create file -

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i have problem nsfilemanager, because can store file application documents directory, want create file sub directory don't think why, couldn't create. code below:

+(nsstring *)applicationdocumentsdirectory {     return [nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) lastobject]; }  +(bool)storefile:(nsdata*)file withname:(nsstring*)name atdirectory:(nsstring*)dir{      nsfilemanager *filemgr;     nsstring *docsdir;     nsstring *newdir;     bool create=no;     filemgr =[nsfilemanager defaultmanager];       docsdir = [storagemanager applicationdocumentsdirectory];      newdir = [docsdir stringbyappendingpathcomponent:dir];      if(![filemgr fileexistsatpath:newdir]){         if([filemgr createdirectoryatpath:newdir withintermediatedirectories:no attributes:nil  error:nil]){             create=yes;         }         }else         create=yes;      if(create){         if(![filemgr createfileatpath:newdir contents:file attributes:nil]){             [filemgr release];             return yes;         }     }          [filemgr release];     return no; }

i not sure why file not created. @ first glance, looks code should work. may overlooking something. depends on passing arguments storefile:withname:atdirectory: method.

nevertheless posting answer because did spot error in code: should not send release filemgr since did not send retain first , did not create object. in case, there no need send retain either, since using locally within method. may want review apple developer connection document "cocoa core competencies: memory management".

i don't think error explains why file not created; though i'm surprised application doesn't crash because of it.


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