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<?xml version="1.0"?>
<!DOCTYPE gsdoc PUBLIC "-//GNUstep//DTD gsdoc 1.0.4//EN" "http://www.gnustep.org/gsdoc-1_0_4.dtd">
<gsdoc base="NSError" up="Base">
  <head>
    <title>NSError class documentation</title>
    <author name="Richard Frith-Macdonald">
      <email address="rfm@gnu.org">
        rfm@gnu.org
      </email>
    </author>
    <copy>2004,2006 Free Software Foundation, Inc.</copy>
  </head>
  <body>
    <front><contents /></front>
    <chapter>
      <heading>
        Software documentation for the NSError class
      </heading>
      <class name="NSError" super="NSObject" ovadd="10.3.0">
        <declared>Foundation/NSError.h</declared>
        <conform>NSCopying</conform>
        <conform>NSCoding</conform>
        <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).
        </desc>
        <method type="id" factory="yes" ovadd="10.3.0">
          <sel>errorWithDomain:</sel>
          <arg type="NSString*">aDomain</arg>
          <sel>code:</sel>
          <arg type="NSInteger">aCode</arg>
          <sel>userInfo:</sel>
          <arg type="NSDictionary*">aDictionary</arg>
          <desc>
            Creates and returns an autoreleased NSError
            instance by calling
            <ref type="method" id="-initWithDomain:code:userInfo:">
              -initWithDomain:code:userInfo:
            </ref>
          </desc>
        </method>
        <method type="NSInteger" ovadd="10.3.0">
          <sel>code</sel>
          <desc>
            Return the error code... which is not globally
            unique, just unique for a particular domain.
          </desc>
        </method>
        <method type="NSString*" ovadd="10.3.0">
          <sel>domain</sel>
          <desc>
            Return the domain for this instance.
          </desc>
        </method>
        <method type="id" init="yes" ovadd="10.3.0">
          <sel>initWithDomain:</sel>
          <arg type="NSString*">aDomain</arg>
          <sel>code:</sel>
          <arg type="NSInteger">aCode</arg>
          <sel>userInfo:</sel>
          <arg type="NSDictionary*">aDictionary</arg>
          <desc>
            Initialises the receiver using the supplied
            domain, code, and info. <br /> The domain must be
            non-nil.
          </desc>
        </method>
        <method type="NSString*" ovadd="10.3.0">
          <sel>localizedDescription</sel>
          <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.
          </desc>
        </method>
        <method type="NSString*" ovadd="10.4.0">
          <sel>localizedFailureReason</sel>
          <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
            <ref type="method" id="-localizedDescription">
              -localizedDescription
            </ref>
            method. <br /> The default implementation uses the
            value from the user info dictionary if it is
            available, otherwise it returns <code>nil</code>
            .
          </desc>
        </method>
        <method type="NSArray*" ovadd="10.4.0">
          <sel>localizedRecoveryOptions</sel>
          <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>.
          </desc>
        </method>
        <method type="NSString*" ovadd="10.4.0">
          <sel>localizedRecoverySuggestion</sel>
          <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>.
          </desc>
        </method>
        <method type="id" ovadd="10.4.0">
          <sel>recoveryAttempter</sel>
          <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>.
          </desc>
        </method>
        <method type="NSDictionary*" ovadd="10.3.0">
          <sel>userInfo</sel>
          <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 />
          </desc>
        </method>
      </class>
    </chapter>
  </body>
</gsdoc>

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