Question

m_cAppIdMap is an object of a dictionary.
I want to iterate through the dictionary and to ind and remove the value pEvent.wTimerId is an unsigned short integer that is stored as key in the dictionary.

if(unsigned short* key in m_cAppIdMap) //error:Expected expression before 'unsigned'
            {
            (void)[self findAndRemoveEvent:pEvent];
            (void)CFDictionaryRemoveValue(m_cAppIdMap,&wTimerId); 
            free(pEvent);
            bReturn = YES;
           }

I am getting an error when i try to iterate through the loop.

EDITED

-(BOOL)KillTimer:(unsigned short)wTimerId
{
    stRs232Timer* pEvent;
    BOOL bReturn=FALSE;

    theLock = [[NSLock alloc]init];

    if ([theLock tryLock]) {
    //  if ( m_cAppIdMap.Lookup(wTimerId,pEvent) )
    //  {
    //      (void)findAndRemoveEvent(pEvent);                   // remove from event queue
    //      (void)m_cAppIdMap.RemoveKey(wTimerId);              // remove from app map
            for(wTimerId in m_cAppIdMap)
            {
             (void)[self findAndRemoveEvent:pEvent];
             (void)CFDictionaryRemoveValue(m_cAppIdMap,&wTimerId); 
             free(pEvent);
             bReturn = YES;
           }

        [theLock unlock];
    }   

    return bReturn;
}

I am getting error in this code ‘selector element does not have a valid object type’ . I need to search for wTimerId(key) in the m_cAppIdMap. Is it what i’m doing is correct.The commented lines above the for loop is the implementation of the same code in cpp. I coud not make the same logic over here in Objective C.

Answer 1

I think you meant to use for rather than if. Additionally, the fast enumeration syntax
for (x in y) can only be used on objects that implement the NSFastEnumeration protocol—typically NSArray. It looks like you’re using C arrays, so this syntax won’t work anyway.