Calling _CFRuntimeCreateInstance

#include <CoreFoundation/CoreFoundation.h>

int main (int argc, const char * argv[])
{
    id anObject = objc_getClass("NSWindow");
    CFTypeID typeID = CFGetTypeID(anObject);
    CFTypeRef pObj = _CFRuntimeCreateInstance(kCFAllocatorDefault, typeID,
                                          0, NULL);
    if (pObj)
    {
        fprintf(stdout, "SUCCEEDED\n");
        CFRelease(pObj);
    }
    else
    {
        fprintf(stderr, "FAILED\n");
    }
    return 0;
}