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145 lines
5.7 KiB
145 lines
5.7 KiB
15 years ago
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<HTML>
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<HEAD>
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<TITLE> DwFieldBody Man Page </TITLE>
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</HEAD>
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<BODY BGCOLOR="#FFFFFF">
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<H2>
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<FONT COLOR="navy"> NAME </FONT>
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</H2>
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<P>
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DwFieldBody -- Class representing a MIME header field body
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<H2>
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<FONT COLOR="navy"> SYNOPSIS </FONT>
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</H2>
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<PRE>class DW_EXPORT DwFieldBody : public <A HREF="msgcmp.html">DwMessageComponent</A> {
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friend class DwField;
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public:
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<A HREF="fieldbdy.html#DwFieldBody">DwFieldBody</A>();
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<A HREF="fieldbdy.html#DwFieldBody">DwFieldBody</A>(const DwFieldBody& aFieldBody);
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<A HREF="fieldbdy.html#DwFieldBody">DwFieldBody</A>(const DwString& aStr, DwMessageComponent* aParent=0);
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virtual ~DwFieldBody();
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const DwFieldBody& <A HREF="fieldbdy.html#op_eq">operator =</A> (const DwFieldBody& aFieldBody);
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void <A HREF="fieldbdy.html#SetOffset">SetOffset</A>(int aOffset);
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void <A HREF="fieldbdy.html#SetFolding">SetFolding</A>(DwBool aTrueOrFalse);
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DwBool <A HREF="fieldbdy.html#IsFolding">IsFolding</A>() const;
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protected:
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int mLineOffset;
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DwBool mDoFolding;
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public:
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virtual void <A HREF="fieldbdy.html#PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0) const;
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virtual void <A HREF="fieldbdy.html#CheckInvariants">CheckInvariants</A>() const;
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protected:
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void _PrintDebugInfo(ostream& aStrm) const;
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};
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</PRE>
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<H2>
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<FONT COLOR="navy"> DESCRIPTION </FONT>
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</H2>
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<P>
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<B><TT>DwFieldBody</TT></B> represents the field-body element in the BNF
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grammar specified by RFC-822. It is an abstract base class that defines the
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interface common to all structured field bodies.
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<P>
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In the tree (broken-down) representation of a message, a
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<B><TT>DwFieldBody</TT></B> object may be either a leaf node, having a parent
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but no child nodes, or an intermediate node, having a parent and one or more
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child nodes. The parent node is the
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<B><TT><A HREF="field.html">DwField</A></TT></B> object that contains it.
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Child nodes, if present, depend on the particular subclass of
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<B><TT>DwFieldBody</TT></B> that is instantiated. A
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<B><TT>DwAddressList</TT></B> object, for example, has
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<B><TT>DwAddress</TT></B> objects as its child nodes.
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<P>
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Since <B><TT>DwFieldBody</TT></B> is an abstract base class, you cannot create
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instances of it directly. Normally, objects of classes derived from
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<B><TT>DwFieldBody</TT></B> are obtained by calling convenience member functions
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in the class <B><TT><A HREF="headers.html">DwHeaders</A></TT></B>.
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<P>
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Some MIME parsers are broken in that they do not handle the folding of some
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fields properly. <B><TT>DwFieldBody</TT></B> folds its string representation
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by default. You can disable folding, however, by calling the
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<B><TT>SetFolding()</TT></B> member function. To determine if folding is
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enabled, call <B><TT>IsFolding()</TT></B>.
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<H2>
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<FONT COLOR="navy"> Public Member Functions </FONT>
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</H2>
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<P>
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<FONT COLOR="teal"><B> <A NAME="DwFieldBody">DwFieldBody</A>() <BR>
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DwFieldBody(const DwFieldBody& aFieldBody) <BR>
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DwFieldBody(const DwString& aStr, DwMessageComponent* aParent=0)
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</B></FONT>
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<P>
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The first constructor is the default constructor, which sets the
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<B><TT>DwFieldBody</TT></B> object's string representation to the empty string
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and sets its parent to <B><TT>NULL</TT></B>.
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<P>
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The second constructor is the copy constructor, which performs a deep copy
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of <B><TT>aFieldBody</TT></B>. The parent of the new
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<B><TT>DwFieldBody</TT></B> object is set to <B><TT>NULL</TT></B>.
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<P>
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The third constructor copies <B><TT>aStr</TT></B> to the
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<B><TT>DwFieldBody</TT></B> object's string representation and sets
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<B><TT>aParent</TT></B> as its parent. The virtual member function
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<B><TT>Parse()</TT></B> should be called immediately after this constructor
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in order to parse the string representation. Unless it is
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<B><TT>NULL</TT></B>, <B><TT>aParent</TT></B> should point to an object of
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a class derived from <B><TT>DwField</TT></B>.
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<P>
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<FONT COLOR="teal"><B> const DwFieldBody& <A NAME="op_eq">operator =</A>
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(const DwFieldBody& aFieldBody) </B></FONT>
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<P>
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This is the assignment operator, which performs a deep copy of
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<B><TT>aFieldBody</TT></B>. The parent node of the
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<B><TT>DwFieldBody</TT></B> object is not changed.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetOffset">SetOffset</A>(int aOffset)
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</B></FONT>
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<P>
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Sets the offset to <B><TT>aOffset</TT></B>. The offset is used when folding
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lines. It indicates how much the first line should be offset to account for
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the field name, colon, and initial white space.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetFolding">SetFolding</A>(DwBool
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aTrueOrFalse) </B></FONT>
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<P>
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Enables (<B><TT>aTrueOrFalse = DwTrue</TT></B>) or disables
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(<B><TT>aTrueOrFalse = DwFalse</TT></B>) the folding of fields. The default
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is to fold fields. Unfortunately, some parsers are broke and do not handle
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folded lines properly. This function allows a kludge to deal with these broken
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parsers.
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<P>
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<FONT COLOR="teal"><B> DwBool <A NAME="IsFolding">IsFolding</A>() const
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</B></FONT>
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<P>
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Returns a boolean indicating if folding of fields is enabled.
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<P>
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<FONT COLOR="teal"><B> virtual void
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<A NAME="PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0)
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const </B></FONT>
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<P>
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This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
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prints debugging information about this object to <B><TT>aStrm</TT></B>.
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It will also call <B><TT>PrintDebugInfo()</TT></B> for any of its child
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components down to a level of <B><TT>aDepth</TT></B>.
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<P>
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This member function is available only in the debug version of the library.
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<P>
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<FONT COLOR="teal"><B> virtual void
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<A NAME="CheckInvariants">CheckInvariants</A>() const </B></FONT>
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<P>
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Aborts if one of the invariants of the object fails. Use this member function
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to track down bugs.
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<P>
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This member function is available only in the debug version of the library.
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<P>
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</BODY></HTML>
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