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<HTML>
<HEAD>
<TITLE> DwMediaType Man Page </TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<H2>
<FONT COLOR="navy"> NAME </FONT>
</H2>
<P>
DwMediaType -- Class representing a MIME media-type
<H2>
<FONT COLOR="navy"> SYNOPSIS </FONT>
</H2>
<PRE>class DW_EXPORT DwMediaType : public <A HREF="fieldbdy.html">DwFieldBody</A> {
public:
<A HREF="mediatyp.html#DwMediaType">DwMediaType</A>();
<A HREF="mediatyp.html#DwMediaType">DwMediaType</A>(const DwMediaType& aMediaType);
<A HREF="mediatyp.html#DwMediaType">DwMediaType</A>(const DwString& aStr, DwMessageComponent* aParent=0);
virtual ~DwMediaType();
const DwMediaType& <A HREF="mediatyp.html#op_eq">operator =</A> (const DwMediaType& aMediaType);
virtual void <A HREF="mediatyp.html#Parse">Parse</A>();
virtual void <A HREF="mediatyp.html#Assemble">Assemble</A>();
virtual DwMessageComponent* <A HREF="mediatyp.html#Clone">Clone</A>() const;
int <A HREF="mediatyp.html#Type">Type</A>() const;
void <A HREF="mediatyp.html#SetType">SetType</A>(int aType);
const DwString& <A HREF="mediatyp.html#TypeStr">TypeStr</A>() const;
void <A HREF="mediatyp.html#SetTypeStr">SetTypeStr</A>(const DwString& aStr);
int <A HREF="mediatyp.html#Subtype">Subtype</A>() const;
void <A HREF="mediatyp.html#SetSubtype">SetSubtype</A>(int aSubtype);
const DwString& <A HREF="mediatyp.html#SubtypeStr">SubtypeStr</A>() const;
void <A HREF="mediatyp.html#SetSubtypeStr">SetSubtypeStr</A>(const DwString& aStr);
const DwString& <A HREF="mediatyp.html#Boundary">Boundary</A>() const;
void <A HREF="mediatyp.html#SetBoundary">SetBoundary</A>(const DwString& aStr);
virtual void <A HREF="mediatyp.html#CreateBoundary">CreateBoundary</A>(unsigned aLevel=0);
const DwString& <A HREF="mediatyp.html#Name">Name</A>() const;
void <A HREF="mediatyp.html#SetName">SetName</A>(const DwString& aStr);
DwParameter* <A HREF="mediatyp.html#FirstParameter">FirstParameter</A>() const;
void <A HREF="mediatyp.html#AddParameter">AddParameter</A>(DwParameter* aParam);
static DwMediaType* <A HREF="mediatyp.html#NewMediaType">NewMediaType</A>(const DwString& aStr,
DwMessageComponent* aParent);
static DwMediaType* (*<A HREF="mediatyp.html#sNewMediaType">sNewMediaType</A>)(const DwString&,
DwMessageComponent*);
protected:
void _AddParameter(DwParameter* aParam);
virtual void TypeEnumToStr();
virtual void TypeStrToEnum();
virtual void SubtypeEnumToStr();
virtual void SubtypeStrToEnum();
void DeleteParameterList();
void CopyParameterList(DwParameter* aFirst);
int mType;
int mSubtype;
DwString mTypeStr;
DwString mSubtypeStr;
DwString mBoundaryStr;
DwString <A HREF="mediatyp.html#mNameStr">mNameStr</A>;
DwParameter* mFirstParameter;
public:
virtual void <A HREF="mediatyp.html#PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0) const;
virtual void <A HREF="mediatyp.html#CheckInvariants">CheckInvariants</A>() const;
protected:
void _PrintDebugInfo(ostream& aStrm) const;
};
</PRE>
<H2>
<FONT COLOR="navy"> DESCRIPTION </FONT>
</H2>
<P>
<B><TT>DwMediaType</TT></B> represents a field body for the Content-Type
header field as described in RFC-2045. This field body specifies the kind
of data contained in the body of a message or a body part. A media type is
described by two keywords: a primary type (or just <I>type</I>) and a
<I>subtype</I>. RFC-2046 specifies the seven primary types text, multipart,
message, image, audio, video, and application. RFC-2077 adds the new primary
type model.
<P>
<B><TT>DwMediaType</TT></B> has member functions that allow you to set or
get the type and subtype as either enumerated values or as strings. It also
contains a list of
<B><TT><A HREF="param.html">DwParameter</A></TT></B> objects that represent
the parameters of the field body. You can use convenience functions to directly
access the boundary parameter of a multipart media type, or to access the
name parameter that is often used with several media types, such as
application/octet-stream.
<P>
Some MIME parsers have problems with folded header fields, and this especially
seems to be a problem with the Content-Type field. To disable folding when
the <B><TT>DwMediaType</TT></B> object is assembled, call the inherited member
function <B><TT>DwFieldBody::SetFolding()</TT></B> with an argument of
<B><TT>DwFalse</TT></B>.
<H2>
<FONT COLOR="navy"> Public Member Functions </FONT>
</H2>
<P>
<FONT COLOR="teal"><B> <A NAME="DwMediaType">DwMediaType</A>() <BR>
DwMediaType(const DwMediaType& aMediaType) <BR>
DwMediaType(const DwString& aStr, DwMessageComponent* aParent=0)
</B></FONT>
<P>
The first constructor is the default constructor, which sets the
<B><TT>DwMediaType</TT></B> object's string representation to the empty string
and sets its parent to <B><TT>NULL</TT></B>.
<P>
The second constructor is the copy constructor, which performs deep copy
of <B><TT>aMediaType</TT></B>. The parent of the new
<B><TT>DwMediaType</TT></B> object is set to <B><TT>NULL</TT></B>.
<P>
The third constructor copies <B><TT>aStr</TT></B> to the
<B><TT>DwMediaType</TT></B> object's string representation and sets
<B><TT>aParent</TT></B> as its parent. The virtual member function
<B><TT>Parse()</TT></B> should be called immediately after this constructor
in order to parse the string representation. Unless it is
<B><TT>NULL</TT></B>, <B><TT>aParent</TT></B> should point to an object of
a class derived from <B><TT>DwField</TT></B>.
<P>
<FONT COLOR="teal"><B> const DwMediaType& <A NAME="op_eq">operator =</A>
(const DwMediaType& aMediaType) </B></FONT>
<P>
This is the assignment operator, which performs a deep copy of
<B><TT>aMediaType</TT></B>. The parent node of the
<B><TT>DwMediaType</TT></B> object is not changed.
<P>
<FONT COLOR="teal"><B> virtual void <A NAME="Parse">Parse</A>() </B></FONT>
<P>
This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
executes the parse method for <B><TT>DwMediaType</TT></B> objects. It should
be called immediately after the string representation is modified and before
the parts of the broken-down representation are accessed.
<P>
This function clears the is-modified flag.
<P>
<FONT COLOR="teal"><B> virtual void <A NAME="Assemble">Assemble</A>()
</B></FONT>
<P>
This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
executes the assemble method for <B><TT>DwMediaType</TT></B> objects. It
should be called whenever one of the object's attributes is changed in order
to assemble the string representation from its broken-down representation.
It will be called automatically for this object by the parent object's
<B><TT>Assemble()</TT></B> member function if the is-modified flag is set.
<P>
This function clears the is-modified flag.
<P>
<FONT COLOR="teal"><B> virtual DwMessageComponent*
<A NAME="Clone">Clone</A>() const </B></FONT>
<P>
This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
creates a new <B><TT>DwMediaType</TT></B> object on the free store that has
the same value as this <B><TT>DwMediaType</TT></B> object. The basic idea
is that of a virtual copy constructor.
<P>
<FONT COLOR="teal"><B> int <A NAME="Type">Type</A>() const </B></FONT>
<P>
Returns the primary type as an enumerated value. Enumerated values are defined
for all standard types in the file enum.h. If the type is non-standard,
<B><TT>DwMime::kTypeUnknown</TT></B> is returned. The member function
<B><TT>TypeStr()</TT></B> may be used to get the value of any type, standard
or non-standard, as a string.
<P>
<FONT COLOR="teal"><B> void <A NAME="SetType">SetType</A>(int aType)
</B></FONT>
<P>
Sets the primary type from the enumerated value <B><TT>aType</TT></B>. Enumerated
values are defined for all standard types in the file enum.h. The member
function <B><TT>SetTypeStr()</TT></B> may be used to set the value of any
type, standard or non-standard, from a string.
<P>
<FONT COLOR="teal"><B> const DwString& <A NAME="TypeStr">TypeStr</A>()
const </B></FONT>
<P>
Returns the primary type as a string.
<P>
<FONT COLOR="teal"><B> void <A NAME="SetTypeStr">SetTypeStr</A>(const
DwString& aStr) </B></FONT>
<P>
Sets the primary type from a string.
<P>
<FONT COLOR="teal"><B> int <A NAME="Subtype">Subtype</A>() const </B></FONT>
<P>
Returns the subtype as an enumerated value. Enumerated values are defined
for all standard subtypes in the file enum.h. If the subtype is non-standard,
<B><TT>DwMime::kSubtypeUnknown</TT></B> is returned. The member function
<B><TT>SubtypeStr()</TT></B> may be used to get the value of any subtype,
standard or non-standard, as a string.
<P>
<FONT COLOR="teal"><B> void <A NAME="SetSubtype">SetSubtype</A>(int aSubtype)
</B></FONT>
<P>
Sets the subtype from the enumerated value <B><TT>aSubtype</TT></B>. Enumerated
values are defined for all standard subtypes in the file enum.h. The member
function <B><TT>SetSubtypeStr()</TT></B> may be used to set the value of
any subtype, standard or non-standard, from a string.
<P>
<FONT COLOR="teal"><B> const DwString&
<A NAME="SubtypeStr">SubtypeStr</A>() const </B></FONT>
<P>
Returns the subtype as a string.
<P>
<FONT COLOR="teal"><B> void <A NAME="SetSubtypeStr">SetSubtypeStr</A>(const
DwString& aStr) </B></FONT>
<P>
Sets the subtype from a string.
<P>
<FONT COLOR="teal"><B> const DwString& <A NAME="Boundary">Boundary</A>()
const </B></FONT>
<P>
For the multipart type only, returns the value of the boundary parameter.
This member function is a convenience function that searches the list of
<B><TT>DwParameter</TT></B> objects.
<P>
<FONT COLOR="teal"><B> void <A NAME="SetBoundary">SetBoundary</A>(const
DwString& aStr) </B></FONT>
<P>
For the multipart type only, sets the value of the boundary parameter. This
member function is a convenience function that accesses the list of
<B><TT>DwParameter</TT></B> objects.
<P>
<FONT COLOR="teal"><B> virtual void
<A NAME="CreateBoundary">CreateBoundary</A>(unsigned aLevel=0) </B></FONT>
<P>
For the multipart type only, creates a boundary string.
<B><TT>aLevel</TT></B> indicates the level of a nested multipart body part;
if it is positive, it is used to form part of the created boundary string.
This member function is a convenience function that accesses the list of
child <B><TT>DwParameter</TT></B> objects.
<P>
<FONT COLOR="teal"><B> const DwString& <A NAME="Name">Name</A>() const
</B></FONT>
<P>
Returns the value of the "name" parameter, if such a parameter is present.
The name parameter is often found in several media types, including the
application/octet-stream media type; it suggests a file name for saving to
a disk file. (The filename parameter in the Content-Disposition header field
is an alternative way to indicate a file name.) This member function is a
convenience function that searches the list of
<B><TT>DwParameter</TT></B> objects.
<P>
<FONT COLOR="teal"><B> void <A NAME="SetName">SetName</A>(const DwString&
aStr) </B></FONT>
<P>
Sets the value of the "name" parameter. If a name parameter is not already
present, it is added. The name parameter is often found in several media
types, including the application/octet-stream media type; it suggests a file
name for saving to a disk file. (The filename parameter in the
Content-Disposition header field is an alternative way to indicate a file
name.) This member function is a convenience function that accesses the list
of <B><TT>DwParameter</TT></B> objects.
<P>
<FONT COLOR="teal"><B> DwParameter*
<A NAME="FirstParameter">FirstParameter</A>() const </B></FONT>
<P>
Returns the first <B><TT>DwParameter</TT></B> object in the list managed
by this <B><TT>DwMediaType</TT></B> object. Use
<B><TT>DwParameter::Next()</TT></B> to iterate through the list.
<P>
<FONT COLOR="teal"><B> void
<A NAME="AddParameter">AddParameter</A>(DwParameter* aParam) </B></FONT>
<P>
Adds a <B><TT>DwParameter</TT></B> object to the list managed by this
<B><TT>DwMediaType</TT></B> object.
<P>
<FONT COLOR="teal"><B> static DwMediaType*
<A NAME="NewMediaType">NewMediaType</A>(const DwString& aStr,
DwMessageComponent* aParent) </B></FONT>
<P>
Creates a new <B><TT>DwMediaType</TT></B> object on the free store. If the
static data member <B><TT>sNewMediaType</TT></B> is <B><TT>NULL</TT></B>,
this member function will create a new <B><TT>DwMediaType</TT></B> and return
it. Otherwise, <B><TT>NewMediaType()</TT></B> will call the user-supplied
function pointed to by <B><TT>sNewMediaType</TT></B>, which is assumed to
return an object from a class derived from <B><TT>DwMediaType</TT></B>, and
return that object.
<P>
<FONT COLOR="teal"><B> virtual void
<A NAME="PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0)
const </B></FONT>
<P>
This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
prints debugging information about this object to <B><TT>aStrm</TT></B>.
It will also call <B><TT>PrintDebugInfo()</TT></B> for any of its child
components down to a level of <B><TT>aDepth</TT></B>.
<P>
This member function is available only in the debug version of the library.
<P>
<FONT COLOR="teal"><B> virtual void
<A NAME="CheckInvariants">CheckInvariants</A>() const </B></FONT>
<P>
Aborts if one of the invariants of the object fails. Use this member function
to track down bugs.
<P>
This member function is available only in the debug version of the library.
<H2>
<FONT COLOR="navy"> Public Data Members </FONT>
</H2>
<P>
<FONT COLOR="teal"><B> static DwMediaType*
(*<A NAME="sNewMediaType">sNewMediaType</A>)(const DwString&,
DwMessageComponent*) </B></FONT>
<P>
If <B><TT>sNewMediaType</TT></B> is not <B><TT>NULL</TT></B>, it is assumed
to point to a user-supplied function that returns an object from a class
derived from <B><TT>DwMediaType</TT></B>.
</BODY></HTML>
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