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Possible Duplicate:
objective C: write in a csv (txt) string contained in some textfield

I have this code to write a string in a csv file (txt)

NSMutableString *csvString = [NSMutableString stringWithString:textfield1.text];
[csvString appendString:@"#"];
[csvString appendString:textfield2.text];
[csvString appendString:@"#"];
[csvString appendString:dtextfield3.text];
[csvString appendString:@"#"];
[csvString appendString:textfield4.text];
[csvString appendString:@"#"];
[csvString appendString:textfield5.text];
[csvString appendString:@"#"];
[csvString appendString:textfield6.text];
[csvString appendString:@"#"];
[csvString appendString:textfield7.text];
[csvString appendString:@"#"];
if (uiswitch.on) { //switch
[csvString appendString:@"1"];
}
else [csvString appendString:@"0"];
[csvString appendString:@";"];

NSString *resourceFileName = @"Client";
NSString *pathToFile =[[NSBundle mainBundle] pathForResource: resourceFileName ofType: @"txt"];
NSError *error;

NSString *fileString = [NSString stringWithContentsOfFile:pathToFile encoding:NSUTF8StringEncoding error:&error];
if (!fileString) {
NSLog(@"Error reading file.");
} 

[csvString writeToFile:pathToFile atomically:YES encoding:NSUTF8StringEncoding error:nil];

But it don't work, why???

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