get information about current session

gistfile1.txt

#include <CoreFoundation/CoreFoundation.h>
#include <ApplicationServices/ApplicationServices.h>
 
CFStringRef shortUserName;
CFNumberRef userUID;
CFBooleanRef userIsActive;
CFBooleanRef loginCompleted;
 
int MyCGGetSessionInfo
{
    CFDictionaryRef sessionInfoDict;
 
    sessionInfoDict = CGSessionCopyCurrentDictionary();
    if (sessionInfoDict == NULL)
    {
        printf("Unable to get session dictionary.");
        return(1);
    }
 
    shortUserName = CFDictionaryGetValue(sessionInfoDict,
                                        kCGSessionUserNameKey);
    userUID = CFDictionaryGetValue(sessionInfoDict,
                                        kCGSessionUserIDKey);
    userIsActive = CFDictionaryGetValue(sessionInfoDict,
                                        kCGSessionOnConsoleKey);
    loginCompleted = CFDictionaryGetValue(sessionInfoDict,
                                        kCGSessionLoginDoneKey);
}