parse integer from mysql query in xcode

问题

I would like to get an integer from mysql call as per call below, and then compare if the value is 0 or 1, I seem to have issues with the NSSTRING and NURL...please help

When I set mysql with value = 1, I still don't get an utput on NSLOG

 NSURL *database_flag_query;
 NSString *database_flag;



database_flag_query = [NSURL URLWithString: [NSString stringWithFormat: @"http://192.168.0.20/iqkradio_stream_ip.php"]];
database_flag = [NSString stringWithContentsOfURL:database_flag_query encoding:NSASCIIStringEncoding error:&error];


if([database_flag isEqualToString: @"1"])
{NSLog(@"flag = 1");}

new code

database_flag_query = [NSURL URLWithString:@"http://192.168.0.20/iqkradio_stream_ip.php"];
database_flag = [NSString stringWithContentsOfURL:database_flag_query encoding:NSASCIIStringEncoding error:&error];
NSLog(database_flag);
if([database_flag isEqualToString: @"1"])
{NSLog(@"flag is set");}

also here is my mysql query

mysql_select_db("qkradio", $con);
$result = mysql_query("select flag from iqkradio" );
while($row = mysql_fetch_array($result)) {
echo $row['flag'];

回答1:

Based on the comments, you have some extra whitespace/newlines added to the end of the output.

You can trim that as follows:

database_flag = [NSString stringWithContentsOfURL:database_flag_query encoding:NSASCIIStringEncoding error:&error];
if (database_flag) {
    database_flag = [database_flag stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    NSLog(@"database_flag = '%@'", database_flag);
    if ([database_flag isEqualToString: @"1"]) {
        NSLog(@"flag is set");
    }
} else {
    NSLog(@"Error: %@", error);
}

来源：https://stackoverflow.com/questions/15983768/parse-integer-from-mysql-query-in-xcode

标签

mysql

objective-c

integer