String Comparison help

Discussion in 'Mac Programming' started by bguy, Jul 14, 2009.

  1. macrumors newbie

    May 30, 2009
    I am writing a Cocoa Program. I have reached a problem when I am trying to compare a user generated string to a constant. Right now I am trying to compare them by using
    if([abc stringValue] == @"xyz")
    Where abc is an editable text field.
    This doesn't work when I type xyz into abc and activate it. I know it is connected correctly as other functions are working. I believe it has to do with the null terminator or something, but I don't know how to fix the problem.
    Can someone help me with this?
  2. Moderator emeritus


    Jun 15, 2000
    [[abc stringValue] isEqualToString:@"xyz"]
  3. macrumors 6502a

    Oct 13, 2007
    The problem is that you are comparing the string pointers in your example to see if they are pointing at the same object. The hard-coded string will point at a pre-compiled string constant (implementation detail) while the other will point at a different string object.

    As kainjow said, the correct approach is to use NSString's isEqualToString method to do the comparison.
  4. thread starter macrumors newbie

    May 30, 2009

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