objective c - stringWithContentsOfFile:usedEncoding:error: does not work -

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i'm trying import csv created filemaker , copied onto device using itunes filesharing. i'm stuck on should straightforward step. can't see i'm going wrong. tried alternative method , setting utf8 encoding. tried exporting filemaker xml utf8, , tried deleting app phone , rerunning. doesn't seem read encoding if specify it. following code gives me console output.

file exists import (null) error domain=nscocoaerrordomain code=264 "the operation couldn’t completed. (cocoa error 264.)"

-(void)importdatabase { nsstring *importstring; nserror *error; nsstring *documentsdirectorypath = [nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) lastobject]; if ([[nsfilemanager defaultmanager] fileexistsatpath:[documentsdirectorypath stringbyappendingstring:@"/iphone.csv"]]) {     nslog(@" file exists");     nsstringencoding encoding;     importstring = [nsstring stringwithcontentsoffile:[documentsdirectorypath stringbyappendingstring:@"/iphone.csv"] usedencoding:&encoding error:&error]; nslog(@"import %@ %@ ",importstring, error); } else {     nslog(@" file doesn't exist"); }

}

from header:

nsfilereadunknownstringencodingerror = 264,         // read error (string encoding of file contents not determined)

try telling foundation encoding is, know encoding is.

importstring = [nsstring stringwithcontentsoffile: blah encoding: nsutf8stringencoding error: &error];

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