Question

I’m trying to develop an app that gets four coord. values from an XML file. The XML file is OK:

<boa1>
    <latitudine>43.10123355297304</latitudine>
    <longitudine>12.31807708740234</longitudine>
</boa1>
<boa2>
    <latitudine>43.07039260770269</latitudine>
    <longitudine>12.315673828125</longitudine>
</boa2>

When I parse its content trying to save the values into my class properties (NSNumber) I can only get longitudes…Why? Here’s the code:

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {

if ([elementName isEqualToString:@"latitudine"]) {
    if (flag == FALSE) {

        NSLog(@"flag FALSE Lat1=%@",result); 
        // HERE THE RESULT IS OK
        lat1 = [NSNumber numberWithDouble:[result doubleValue]];
        NSLog(@"Written Lat1=%@",lat1);
        // HERE THE RESULT is 0.. Why?
    } else {
        NSLog(@"flag TRUE Lat2=%@",result);
        // HERE THE RESULT IS OK
        lat2 = [NSNumber numberWithDouble:[result doubleValue]];            }
    NSLog(@"Written lat2=%@",lat2);
    // HERE THE RESULT IS 0!
}


else if ([elementName isEqualToString:@"longitudine"]) {

    if (flag == FALSE) {
        // HERE THE RESULT IS OK
        NSLog(@"flag FALSE Lon1=%@",result);
        lon1 = [NSNumber numberWithDouble:[result doubleValue]];
        NSLog(@"written LON1=%@",lon1);
        // HERE THE RESULT IS OK
        flag = TRUE;
        // [myRegata.coordinate insertObject:lon1 atIndex:1];
    } else {

        NSLog(@"flag TRUE Lon2=%@",result);
        // HERE THE RESULT IS OK
        lon2 = [NSNumber numberWithDouble:[result doubleValue]];
        // NSLog(@"written LON2=%@",lon2);
        // HERE THE RESULT IS OK


    }            


}}

Answer 1

Probably you are appending also spaces\tab\n to your result string, and then numberWithDouble: fail because of that.

So use something like

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {

    string = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    string = [string stringByTrimmingCharactersInSet:[NSCharacterSet controlCharacterSet]];

    [result appendString:string];

}

to avoid it.