getting the value through key in the dictionary

I need to get the value for the particular key in the map,

id val = [m_cAppIdMap valueForKey:wTimerIds];

where wTimerIds is a unsigned short integer.

Runtime exception:EXC_BAD开发者_如何学运维_ACCESS

Warning: passing argument 1 of 'valueForKey:' makes pointer from integer without a cast

EDITED:

 NSNumber* val = [m_cAppIdMap valueForKey:[NSNumber numberWithUnsignedShort:wTimerIds]];

The warning i'm getting is, incompatible Objective-C types 'struct NSNumber *', expected 'struct NSString *' when passing argument 1 of 'valueForKey:' from distinct Objective-C type

The runtime exception i'm getting is, [NSCFNumber length]: unrecognized selector sent to instance 0x100110c20

I am storing the the key as a unsignedshort in the dictioanry.so i'm trying to search for the value in the dictionary with that data type.

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You can not have primitive integer as key. Keys must be object. You can wrap that integer to a NSString to use as a key.

NSString *key = [NSString stringWithFormat:@"%d", wTimerIds];
[m_cAppIdMap setValue:val forKey:key];
id val = [m_cAppIdMap valueForKey:key];

Or you can wrap that in NSNumber too. You need to use the same thing for both setting and getting. That is, if you use string in setValue:forKey: then you need to use string for valueForKey:. Similarly if you use NSNumber then you need to use that in both place.

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You should use

NSNumber *wTimerIdsNum = [NSNumber numberWithInt:wTimerIds];
id val = [m_cAppIdMap objectForKey:wTimerIdsNum];