iphone, write csv file in sandbox - iphone

Question

i must write (at start of app) and delete is content (at the end of app) a csv in my sandbox file with a stream of data.
For your experience, what's the best way to do this?
edit:
i'm trying with this:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filename =#"test.csv";
NSString *fullPathToFile = [documentsDirectory stringByAppendingPathComponent:filename];
if(![[NSFileManager defaultManager] fileExistsAtPath: fullPathToFile]) {
[[NSFileManager defaultManager] createFileAtPath: fullPathToFile contents:nil attributes:nil];
}
NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath: fullPathToFile];
NSString *data = [NSString stringWithFormat:#"%#,%#\n", latitudine.text, longitudine.text];
[handle writeData:[data dataUsingEncoding:NSUTF8StringEncoding]];
it work but.... every time writedata is call i got only one row, no append. i want to collect all values of my two textlabel.
Where my mistake?
edit2:
yessss, find the solution with this code:
first i've create this one:
- (NSString *)dataFilePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:#"myfile.csv"];
}
and in my viewDidLoad i check and if does not exist, create my file
if (![[NSFileManager defaultManager] fileExistsAtPath:[self dataFilePath]]) {
[[NSFileManager defaultManager] createFileAtPath: [self dataFilePath] contents:nil attributes:nil];
NSLog(#"Route creato");
}
and in one of my method i add the code for retrieve data and append to my file:
NSString *data = [NSString stringWithFormat:#"%#,%# ", latitudine.text, longitudine.text];
//create my data to append
NSFileHandle *handle;
handle = [NSFileHandle fileHandleForWritingAtPath: [self dataFilePath] ];
//say to handle where's the file fo write
[handle truncateFileAtOffset:[handle seekToEndOfFile]];
//position handle cursor to the end of file
[handle writeData:[data dataUsingEncoding:NSUTF8StringEncoding]];
//write data to with the right encoding
Hope this helps!

Answer 1

If you put it in NSTemporaryDirectory(), I think it's supposed to be cleaned up on app exit — it's probably worth checking if this is the case.