Why does Cocoa return an empty string occasionally?

Question

I have some code in my application that looks something like this:

char *hash = (char*) sqlite3_column_text(get_bookmark, 0);
NSString* postHash = [NSString          


        

Answer 1

However I find that postHash is an empty string (@"") for some users some of the time.

Can anyone explain why?

Because hash is an empty string (hash[0] == '\0').