Reading Same File Twice

[Caylan]

Hi,

I'm using the CSV as a lookup table for about 10,000 rows of data. I map at most, two columns to a dictionary, using the first column as a key and then another arbitrary column as the value. Since I have multiple columns, it would be most useful to run the parsing more than once. However, I can't seem to get the second run to work. It never sends any delegate methods for lines/records. I believe this is because the NSInputStream is at the end of the stream. So, I make sure I have no strong pointers to the CHCSVParser object (so it deallocates in ARC), and then create a new CHCSVParser using the same file path. To my surprise, this still doesn't work. Any thoughts on parsing the same file multiple times?

Thanks!

Caylan

[Caylan]

Here's the code I'm using in my delegate.

- (void)parser:(CHCSVParser *)parser didReadField:(NSString *)field atIndex:(NSInteger)fieldIndex
{
    // SKIP: Undefined keyCol and valueCol (both are likely 0)
    if(self.keyCol == self.valueCol)
        return;

    // Set the key in temporary keyObject
    if(fieldIndex == self.keyCol)
    {
        self.keyObject = field;
    }

    // Set the key --> value pair
    if(fieldIndex == self.valueCol && self.keyObject && field)
    {
        [self.mapDict setObject:field forKey:self.keyObject];

        // Reset key (value is temporary)
        self.keyObject = nil;
    }
}

[Caylan]

And...

-(NSDictionary*)dictionaryWithKeysColumn:(NSInteger)keyColumn valueColumn:(NSInteger)valueColumn
{
    self.mapDict = [[NSMutableDictionary alloc] init];
    self.keyCol = keyColumn;
    self.valueCol = valueColumn;
    [self parse];

    self.keyCol = 0;
    self.valueCol = 0;

    return self.mapDict;
}

-(void)parse
{
    self.csvParser = nil;
    [self.csvParser parse];
}

-(CHCSVParser*)csvParser
{
    if(!_csvPathForResource)
    {
        NSLog(@"%s - error, missing csvPathForResource", __PRETTY_FUNCTION__);
        return nil;
    }

    if(!_csvParser)
    {
        NSString *csvFilePath = [[NSBundle mainBundle] pathForResource:self.csvPathForResource
                                                                ofType:@"csv"
                                                           inDirectory:self.csvDirForResource];

        if(csvFilePath)
            _csvParser = [[CHCSVParser alloc] initWithContentsOfCSVFile:csvFilePath];

        NSLog(@"%s - created _csvParser:%@", __PRETTY_FUNCTION__, _csvParser);
    }

    return _csvParser;
}

[Caylan]

DOH. I was on the right track... Deallocating works. However, my code above didn't set the delegate back to self. I added one more line to the lazy loading -csvParser method.

-(CHCSVParser*)csvParser
{
    if(!_csvPathForResource)
    {
        NSLog(@"%s - error, missing csvPathForResource", __PRETTY_FUNCTION__);
        return nil;
    }

    if(!_csvParser)
    {
        NSString *csvFilePath = [[NSBundle mainBundle] pathForResource:self.csvPathForResource
                                                                ofType:@"csv"
                                                           inDirectory:self.csvDirForResource];

        if(csvFilePath)
        {
            _csvParser = [[CHCSVParser alloc] initWithContentsOfCSVFile:csvFilePath];
            _csvParser.delegate = self;
        }           

        NSLog(@"%s - created _csvParser:%@", __PRETTY_FUNCTION__, _csvParser);
    }

    return _csvParser;
}