How to addObject of NSMutableDictionary to NSMutableArray in a loop

Question

I'm having difficulty to add a data structure to an array to create an array of dictionaries from a loop. I just knew that addObject in NSMutableArray only add pointer to it. I would like to know how to achieve my goal.

Here's my code:

NSMutableDictionary *woRows = [[NSMutableDictionary alloc] init];
NSMutableArray *workOrders = [[NSMutableArray alloc] init];
while ([theScanner isAtEnd] == NO)
{
    if ([theScanner scanUpToCharactersFromSet:usSet intoString:&tempCol1] &&
        [theScanner scanString:@"{US}" intoString:NULL] &&
        [theScanner scanUpToCharactersFromSet:usSet intoString:&tempCol2] &&
        [theScanner scanString:@"{US}" intoString:NULL] &&
        [theScanner scanUpToCharactersFromSet:usSet intoString:&tempCol3]&&
        [theScanner scanString:@"{RS}" intoString:NULL])
    {
        [woRows  setValue:tempCol1 forKey:@"hours"];
        [woRows setValue:tempCol2 forKey:@"colMain"];
        [woRows setValue:tempCol3 forKey:@"colAddtl"];

        [workOrders addObject:woRows];
        [woRows release];
    }
}
[tmpString release];
[jobs addObject:workOrders];
[workOrders release];

from the code above, the array workOrders will have duplicates of last objects added only. I stuck here not able to progress to display the correct data.

Any help will be appreciated.

Thanks

score 27 · Accepted Answer · answered Dec 24 '09 at 11:07

27

try doing [workOrders addObject:[woRows copy]];

answered Dec 24 '09 at 11:07

Kenny Winker

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1

It worked, and I like your approach and being used in my code. Any idea why I cannot vote to your answer ? It kept changed back to zero – Ber Biji II Dec 24 '09 at 12:27

score 20 · Answer 2 · answered Sep 15 '11 at 14:29

20

I know, this is a bit late and even not what you were asking for, but I guess you wanted to use [woRows setObject:forKey:] instead of [woRows setValue:forKey:].

answered Sep 15 '11 at 14:29

Akku

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score 7 · Answer 3 · edited Mar 06 '12 at 14:50

7

move your dictionary creation code inside the loop(inside if condition)

woRows = [[NSMutableDictionary alloc] init];

you are using same object...

edited Mar 06 '12 at 14:50

dandan78

13,328
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answered Dec 24 '09 at 11:13

Girish Kolari

2,515
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Thank you, it worked. Any idea why I cannot vote to your answer? – Ber Biji II Dec 24 '09 at 12:25

How to addObject of NSMutableDictionary to NSMutableArray in a loop

3 Answers3