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    <head>
    <title>NSError class documentation</title>
  </head>
  <body>
    <font face="serif">
    <a href="Base.html">Up</a>
    <br />
    <h1><a name="title$NSError">NSError class documentation</a></h1>
    <h3>Authors</h3>
    <dl>
      <dt>Richard Frith-Macdonald (<a href="mailto:rfm@gnu.org"><code>rfm@gnu.org</code></a>)</dt>
      <dd>
      </dd>
    </dl>
    <p><b>Copyright:</b> (C) 2004,2006 Free Software Foundation, Inc.</p>

        <div>
    </div>

          <h1><a name="001000000000">
        Software documentation for the NSError class
      </a></h1>
    <h2><a name="class$NSError">NSError</a> : <a rel="gsdoc" href="NSObject.html#class$NSObject">NSObject</a></h2>
    <blockquote class="declared">
      <dl>
        <dt><b>Declared in:</b></dt>
        <dd>Foundation/NSError.h</dd>
      </dl>
    </blockquote>
    <blockquote>
      <dl>
        <dt><b>Conforms to:</b></dt>
        <dd><a rel="gsdoc" href="NSObject.html#protocol$(NSCopying)">NSCopying</a></dd>
        <dd><a rel="gsdoc" href="NSObject.html#protocol$(NSCoding)">NSCoding</a></dd>
      </dl>
    </blockquote>
    <div class="availability">
<b>Availability:</b> MacOS-X 10.3.0</div>
<br />
    <div class="desc">
      
          Error information class. <br /> NSError instances are
          used to pass information about runtime errors from lower
          levels to higher levels of the program. <br /> These
          should be used instead of exceptions where an error is
          caused by external factors (such as a resource file
          not being present) rather than a programming error (where
          NSException should be used).
        
    </div>
    <b>Method summary</b>
    <ul>
      <li><a rel="gsdoc" href="NSError.html#method$NSError+errorWithDomain$code$userInfo$">+errorWithDomain:code:userInfo:</a></li>
      <li><a rel="gsdoc" href="NSError.html#method$NSError-code">-code</a></li>
      <li><a rel="gsdoc" href="NSError.html#method$NSError-domain">-domain</a></li>
      <li><a rel="gsdoc" href="NSError.html#method$NSError-initWithDomain$code$userInfo$">-initWithDomain:code:userInfo:</a></li>
      <li><a rel="gsdoc" href="NSError.html#method$NSError-localizedDescription">-localizedDescription</a></li>
      <li><a rel="gsdoc" href="NSError.html#method$NSError-localizedFailureReason">-localizedFailureReason</a></li>
      <li><a rel="gsdoc" href="NSError.html#method$NSError-localizedRecoveryOptions">-localizedRecoveryOptions</a></li>
      <li><a rel="gsdoc" href="NSError.html#method$NSError-localizedRecoverySuggestion">-localizedRecoverySuggestion</a></li>
      <li><a rel="gsdoc" href="NSError.html#method$NSError-recoveryAttempter">-recoveryAttempter</a></li>
      <li><a rel="gsdoc" href="NSError.html#method$NSError-userInfo">-userInfo</a></li>
    </ul>
    <hr width="50%" align="left" />
<div class="method">
    <h3><a name="method$NSError+errorWithDomain$code$userInfo$">errorWithDomain:&nbsp;code:&nbsp;userInfo:&nbsp;</a></h3>
    + (id) <b>errorWithDomain:</b> (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*)aDomain<b> code:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSInteger">NSInteger</a>)aCode<b> userInfo:</b> (<a rel="gsdoc" href="NSDictionary.html#class$NSDictionary">NSDictionary</a>*)aDictionary;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.3.0</div>
<br />
    <div class="desc">
      
            Creates and returns an autoreleased NSError
            instance by calling
            <a rel="gsdoc" href="#method$NSError-initWithDomain$code$userInfo$">
              -initWithDomain:code:userInfo:
            </a>

          
    </div>
    <hr width="25%" align="left" />
</div>
<div class="method">
    <h3><a name="method$NSError-code">code&nbsp;</a></h3>
    - (<a rel="gsdoc" href="TypesAndConstants.html#type$NSInteger">NSInteger</a>) <b>code</b>;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.3.0</div>
<br />
    <div class="desc">
      
            Return the error code... which is not globally
            unique, just unique for a particular domain.
          
    </div>
    <hr width="25%" align="left" />
</div>
<div class="method">
    <h3><a name="method$NSError-domain">domain&nbsp;</a></h3>
    - (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*) <b>domain</b>;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.3.0</div>
<br />
    <div class="desc">
      
            Return the domain for this instance.
          
    </div>
    <hr width="25%" align="left" />
</div>
<div class="method">
    <h3><a name="method$NSError-initWithDomain$code$userInfo$">initWithDomain:&nbsp;code:&nbsp;userInfo:&nbsp;</a></h3>
    - (id) <b>initWithDomain:</b> (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*)aDomain<b> code:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSInteger">NSInteger</a>)aCode<b> userInfo:</b> (<a rel="gsdoc" href="NSDictionary.html#class$NSDictionary">NSDictionary</a>*)aDictionary;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.3.0</div>
<br />
This is a designated initialiser for the class.<br />
    <div class="desc">
      
            Initialises the receiver using the supplied
            domain, code, and info. <br /> The domain must be
            non-nil.
          
    </div>
    <hr width="25%" align="left" />
</div>
<div class="method">
    <h3><a name="method$NSError-localizedDescription">localizedDescription&nbsp;</a></h3>
    - (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*) <b>localizedDescription</b>;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.3.0</div>
<br />
    <div class="desc">
      
            Return a human readable description for the error.
            <br /> The default implementation uses the value
            from the user info dictionary if it is available,
            otherwise it generates a generic one from domain
            and code.
          
    </div>
    <hr width="25%" align="left" />
</div>
<div class="method">
    <h3><a name="method$NSError-localizedFailureReason">localizedFailureReason&nbsp;</a></h3>
    - (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*) <b>localizedFailureReason</b>;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.4.0</div>
<br />
    <div class="desc">
      
            Return a human readable explanation of the reason
            for the error (if known). This should normally be a
            more discursive explanation then the
            <strong>short</strong> one provided by the
            <a rel="gsdoc" href="#method$NSError-localizedDescription">
              -localizedDescription
            </a>

            method. <br /> The default implementation uses the
            value from the user info dictionary if it is
            available, otherwise it returns <code>nil</code>
            .
          
    </div>
    <hr width="25%" align="left" />
</div>
<div class="method">
    <h3><a name="method$NSError-localizedRecoveryOptions">localizedRecoveryOptions&nbsp;</a></h3>
    - (<a rel="gsdoc" href="NSArray.html#class$NSArray">NSArray</a>*) <b>localizedRecoveryOptions</b>;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.4.0</div>
<br />
    <div class="desc">
      
            Returns an array of strings to be used as titles of
            buttons in an alert panel when offering the user
            optionbs to try to recover from the error. <br />
            The default implementation uses the value from the user
            info dictionary if it is available, otherwise it
            returns <code>nil</code>.
          
    </div>
    <hr width="25%" align="left" />
</div>
<div class="method">
    <h3><a name="method$NSError-localizedRecoverySuggestion">localizedRecoverySuggestion&nbsp;</a></h3>
    - (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*) <b>localizedRecoverySuggestion</b>;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.4.0</div>
<br />
    <div class="desc">
      
            Returns a string used as the secondary text in an
            alert panel, suggesting how the user might select an
            option to attempt to recover from the error. <br />
            The default implementation uses the value from the user
            info dictionary if it is available, otherwise it
            returns <code>nil</code>.
          
    </div>
    <hr width="25%" align="left" />
</div>
<div class="method">
    <h3><a name="method$NSError-recoveryAttempter">recoveryAttempter&nbsp;</a></h3>
    - (id) <b>recoveryAttempter</b>;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.4.0</div>
<br />
    <div class="desc">
      
            Not yet useful in GNUstep. <br /> The default
            implementation uses the value from the user
            info dictionary if it is available, otherwise it
            returns <code>nil</code>.
          
    </div>
    <hr width="25%" align="left" />
</div>
<div class="method">
    <h3><a name="method$NSError-userInfo">userInfo&nbsp;</a></h3>
    - (<a rel="gsdoc" href="NSDictionary.html#class$NSDictionary">NSDictionary</a>*) <b>userInfo</b>;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.3.0</div>
<br />
    <div class="desc">
      
            Return the user info for this instance (or
            <code>nil</code> if none is set) <br /> The
            <code>NSLocalizedDescriptionKey</code> should locate
            a human readable description in the dictionary. <br />
            The <code>NSUnderlyingErrorKey</code> key should locate
            an <code>NSError</code> instance if an error is
            available describing any underlying problem.
            <br />
          
    </div>
    <hr width="25%" align="left" />
</div>
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