iosobjective-ccocoansstringcfstring

Incompatible pointer types sending 'const CFStringRef' (aka 'const struct __CFString *const') to parameter of type 'id'

I am trying this in my cocoa app to get the information of directory/Files in system. This method return me a dictionary with some key attribute listed 

-(NSDictionary *) metadataForFileAtPath:(NSString *) path {
    NSURL *url = [[[NSURL alloc] initFileURLWithPath:path] autorelease];

    MDItemRef itemRef = MDItemCreateWithURL(NULL, (CFURLRef)url);
    NSArray *attributeNames = (NSArray *)MDItemCopyAttributeNames(itemRef);
    NSDictionary *attributes = (NSDictionary *) MDItemCopyAttributes(itemRef, (CFArrayRef) attributeNames);
    CFRelease(itemRef);

    // probably it is leaking memory (attributeNames and attributes), better check with Instruments

    return attributes;
}

Another method...

NSDictionary *dict = [self metadataForFileAtPath];
NSString *date = [dict objectForKey:kMDItemFSCreationDate];

When I do this I got a warning message " Incompatible pointer types sending 'const CFStringRef' (aka 'const struct __CFString *const') to parameter of type 'id' " I am trying to type cast them into string but it still exist. I didn't get where I am wrong.

Solution

  • My Problem is solved by doing this

    NSString *date = [dict objectForKey:@"kMDItemFSCreationDate"];

    Anyway thanks for your help.