NSLog NSString* print doesn't print

I am having problems with NSLog method and some objects. My objects return an NSString*, but the string is concatenated with several other strings like this :

-(NSString*) identiteSimple
{
    NSString *res = [[NSString alloc] initWit开发者_JS百科hString:prenom];
    res = [res stringByAppendingString:@" "];
    res = [res stringByAppendingString:nom];
    return res;
}

however, when I try to print it using NSLog like this :

NSLog([myObj identiteSimple]);

Xcode warns me that:

"Format string is not a string literal (potentially insecure)"

And nothing gets printed. Does anyone have any idea why the NSString doesn't get printed?

---

Based on your comments to other answers, you're not actually allocating memory for your Personne object.

Personne *moi = [moi initWithName:@"Lennon" prenom:@"John" civilite:@"Mr"];

moi is nil when you try to call initWithName:prenom:civilite:. Messages to nil do nothing and return nil, so moi will still be nil, and identiteSimple will also return nil when you call NSLog().

---

You should try :

NSLog(@"%@", [myObj identiteSimple]);

---

First of all, you are leaking memory for res. You are allocating that, then pointing it to new string without releasing the alloced one.

NSString *res = [[NSString alloc] initWithString:prenom];

// after this line res points to new string, leaking previous alloced memory
res = [res stringByAppendingString:@" "];  

Instead of alloc you should create autoreleased string here.

NSString *res = [NSString stringWithString:prenom];
res = [res stringByAppendingString:@" "];
res = [res stringByAppendingString:nom];

Or even beteter:

return [NSString stringWithFormat:@"%@ %@", prenom, nom];

My guess about not printing is that prenom or nom is not a valid NSString. You should post their code too. And you can debug by checking res after every new string to find out where it is breaking.

Something like this:

NSString *res = [NSString stringWithString:prenom];
NSLog(prenom);  // prenom is OK
NSLog(res);     // res is OK here

res = [res stringByAppendingString:@" "];
NSLog(res);    // res is OK here too

res = [res stringByAppendingString:nom];
NSLog(nom);    // nom is OK
NSLog(res);    // final content of res

Hope it helps.