NSDictionary and CTypedPtrMap-Objective C

c++ - CTypedPtrMap<CMapWordToPtr,WORD,stTimer*> m_cAppMap;

stTimer* is a structure containing 5 values and WORD is unsigned short which is the key. Is it possible to store an structure object in NSDictionary.

stTimer* pEvent; NSDictionary *dictionary = [[NSDictionary alloc]init]; [dictionary setObject:pEvent forKey:wTimerId];

Warnings:

Passing argument 1 of setobject:forKey from an incompatible pointer type

EDITED

CFMutableDictionaryRef dict = CFDictionaryCreateMutable(NULL,0,&kCFTypeDictionaryKeyCallBacks,&kCFTypeDictionaryValueCallBacks);
    NSLog(@"Dict Size:%d\n",(int)((CFIndex)CFDictionaryGetCount(dict)));
    CFDictionarySetValue(dict,wTimerId,pEvent);

The key and value passed should be objects in this case. But the key(wTimerId) is an unsigned short 开发者_StackOverflowint and not a pointer or an object.

How to pass it as a key?

EDITED:

Timers.h
--------
#import <Foundation/Foundation.h>

struct session {
    int a;
    char c;
    int b;
};

@interface Timers : NSObject {
    unsigned short wTimerId;
}
-(id)init;
-(void)dealloc;
-(void)timer;
@end


Timers.m
--------

#import "Timers.h"


@implementation Timers

-(id)init
{
    wTimerId=91;
    return self;
}

-(void)dealloc
{
    [super dealloc];
}

-(void)timer
{
struct session* pEvent;

    pEvent->a=10;
    pEvent->c='A';
    pEvent->b=20;


CFDictionaryValueCallBacks cbs = {0,NULL,NULL,NULL,NULL};
CFMutableDictionaryRef cfdict = CFDictionaryCreateMutable(NULL,0,&kCFTypeDictionaryKeyCallBacks,&cbs);
NSMutableDictionary* dict = (NSMutableDictionary*)cfdict;

    //Now both the coca approach

[dict setObject:(id)pEvent forKey:[NSNumber numberWithInt:wTimerId]];

//..and the CoreFoundation aproach work

    CFNumberRef timerId = CFNumberCreate(NULL,kCFNumberShortType,wTimerId);
    CFDictionarySetValue(cfdict,timerId,pEvent);
    NSLog(@"Dict size:%d\n",(int)((CFIndex)CFDictionaryGetCount(dict)));
    CFRelease(timerId);

main.m
------
#import <Foundation/Foundation.h>
#import "Timers.h"
int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    Timers* time = [[Timers alloc]init];
    [time timer];
    [pool drain];
    return 0;
}

Its giving me EXC_BAD_ACCESS Error.

EDITED:

1.CFNumberRef timerId = CFNumberCreate(NULL,kCFNumberShortType,wTimerId);

2.NSLog(@"Dict size:%d\n",(int)((CFIndex)CFDictionaryGetCount(dict)));

warning of 1./timer/Timers.m:50:0 /timer/Timers.m:50: warning:passing argument 3 of 'CFNumberCreate' makes pointer from integer without a cast

warning of 2./timer/Timers.m:52:0 /timer/Timers.m:52: warning: passing argument 1 of 'CFDictionaryGetCount' from incompatible pointer type

I did as told in the warning by typecasting it into (unsigned short*) as the datatype of

wTimerId is unsigned short.It will give me another warning as cast to pointer from integer of different size.

---

You can't just pass pointers to plain structs or instances of C++ classes - NSDictionary expects Objective-C objects confirming to the Cocoa standards.

You could store NSValue instances in the dictionary using +valueWithPointer:.
Alternatively you could create a CFDictionary directly and setup the callbacks accordingly - CFDictionary is toll-free bridged to NSDictionary, so you can use it just like before for the most part.

Edit:
For the key the same problem applies, you can just use NSNumber to wrap them. Also you can't use the default dictionary callbacks for the values, instead use something like:

CFDictionaryValueCallBacks cbs = {0, NULL, NULL, NULL, NULL};
CFMutableDictionaryRef cfdict = 
    CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &cbs);
NSMutableDictionary *dict = (NSMutableDictionary *)cfdict;

// now both the Cocoa approach:
[dict setObject:(id)pEvent forKey:[NSNumber numberWithInt:wTimerId]];
// .. and the CoreFoundation approach work:
CFNumberRef timerId = CFNumberCreate(..., &wTimerId);
CFDictionarySetValue(cfdict, timerId, pEvent);
CFRelease(timerId);

If you don't want to wrap the key you have to adjust the key callbacks as well.