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<HTML>
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<HEAD>
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<TITLE> DwNntpClient 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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DwNntpClient -- Class for handling the client side of an NNTP session
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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 DwNntpClient : public <A HREF="protocol.html">DwProtocolClient</A> {
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public:
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enum {
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kCmdNoCommand=0,
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kCmdArticle,
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kCmdBody,
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kCmdHead,
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kCmdStat,
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kCmdGroup,
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kCmdHelp,
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kCmdIhave,
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kCmdLast,
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kCmdList,
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kCmdNewgroups,
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kCmdNewnews,
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kCmdNext,
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kCmdPost,
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kCmdQuit,
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kCmdSlave
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};
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<A HREF="nntp.html#DwNntpClient">DwNntpClient</A>();
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virtual ~DwNntpClient();
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virtual int <A HREF="nntp.html#Open">Open</A>(const char* aServer, DwUint16 aPort=119);
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DwObserver* <A HREF="nntp.html#SetObserver">SetObserver</A>(DwObserver* aObserver);
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int <A HREF="nntp.html#ReplyCode">ReplyCode</A>() const;
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const DwString& <A HREF="nntp.html#StatusResponse">StatusResponse</A>() const;
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const DwString& <A HREF="nntp.html#TextResponse">TextResponse</A>() const;
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int <A HREF="nntp.html#Article">Article</A>(int aNumber=(-1));
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int <A HREF="nntp.html#Article">Article</A>(const char* aMsgid);
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int <A HREF="nntp.html#Body">Body</A>(int aNumber=(-1));
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int <A HREF="nntp.html#Body">Body</A>(const char* aMsgid);
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int <A HREF="nntp.html#Head">Head</A>(int aNumber=(-1));
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int <A HREF="nntp.html#Head">Head</A>(const char* aMsgid);
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int <A HREF="nntp.html#Stat">Stat</A>(int aNumber=(-1));
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int <A HREF="nntp.html#Stat">Stat</A>(const char* aMsgid);
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int <A HREF="nntp.html#Group">Group</A>(const char* aNewsgroupName);
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int <A HREF="nntp.html#Help">Help</A>();
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int <A HREF="nntp.html#Ihave">Ihave</A>(const char* aMsgId);
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int <A HREF="nntp.html#Last">Last</A>();
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int <A HREF="nntp.html#List">List</A>();
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int <A HREF="nntp.html#Newgroups">Newgroups</A>(const char* aDate, const char* aTime,
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DwBool aIsGmt=DwFalse, const char* aDistributions=0);
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int <A HREF="nntp.html#Newnews">Newnews</A>(const char* aNewsgroups, const char* aDate,
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const char* aTime, DwBool aIsGmt=DwFalse, const char* aDistribution=0);
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int <A HREF="nntp.html#Next">Next</A>();
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int <A HREF="nntp.html#Post">Post</A>();
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int <A HREF="nntp.html#Quit">Quit</A>();
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int <A HREF="nntp.html#Slave">Slave</A>();
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int <A HREF="nntp.html#SendData">SendData</A>(const DwString& aStr);
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int <A HREF="nntp.html#SendData">SendData</A>(const char* aBuf, int aBufLen);
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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>DwNntpClient</TT></B> is a class that handles the client side of an
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NNTP session. Specifically, <B><TT>DwNntpClient</TT></B> provides facilities
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for opening a connection to an NNTP server, sending commands and data to
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the server, receiving responses and data from the server, and closing the
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connection. The protocol implemented is the Network News Transport Protocol,
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as specified in RFC-977.
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<P>
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<B><TT>DwNntpClient</TT></B> is derived from
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<B><TT><A HREF="protocol.html">DwProtocolClient</A></TT></B>. For information
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about inherited member functions, especially member functions for detecting
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failures or errors, see the man page for
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<B><TT>DwProtocolClient</TT></B>.
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<P>
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In an NNTP session, the client sends commands to the server and receives
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responses from the server. A client command consists of a command word and
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zero or more argument words. A server response consists of a status line
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and possibly some additional lines of text. The status line consists of a
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three-digit numeric reply code followed by additional information. The reply
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code indicates a success or failure condition. In some cases, the server
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sends lines of text immediately after the status line.
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<B><TT>DwNntpClient</TT></B> provides facilities for you to send commands
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to the server and receive responses from the server.
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<P>
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<B><TT>DwNntpClient</TT></B> has only a default constructor. On Win32 platforms,
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it is possible for the constructor to fail. (It calls WSAStartup().) You
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should verify that the constructor succeeded by calling the inherited member
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function <B><TT>DwProtocolClient::LastError()</TT></B> and checking for a
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zero return value.
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<P>
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To open a connection to the server, call the member function
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<B><TT>Open()</TT></B> with the name of the server as an argument.
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<B><TT>Open()</TT></B> accepts an optional argument that specifies the TCP
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port that the server listens to. The default port is the standard NNTP port
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(119). <B><TT>Open()</TT></B> may fail, so you should check the return value
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to verify that it succeeded. To close the connection, call the inherited
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member function <B><TT>DwProtocolClient::Close()</TT></B>. To check if a
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connection is open, call the inherited member function
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<B><TT>DwProtocolClient::IsOpen()</TT></B>. <B><TT>IsOpen()</TT></B> returns
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a boolean value that indicates whether or not a call to
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<B><TT>Open()</TT></B> was successful; it will not detect failure in the
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network or a close operation by the remote host.
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<P>
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For each NNTP command, <B><TT>DwNntpClient</TT></B> has a member function
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that sends that command and receives the server's response. If the command
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takes any arguments, then those arguments are passed as function arguments
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to the command function. The command functions return the numeric value of
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the three-digit reply code returned by the server. Your program must check
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the reply code to determine whether or not the command was accepted and performed
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by the server. In some cases, because of a communications error or some other
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error, it is not possible for the command function to send the command or
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receive the response. When this happens, the command function will return
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0. You can determine the precise error or failure by calling the inherited
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member functions <B><TT>DwProtocolClient::LastError()</TT></B> or
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<B><TT>DwProtocolClient::LastFailure()</TT></B>.
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<P>
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After each command is sent, <B><TT>DwNntpClient</TT></B> receives the server's
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response and remembers it. The member function
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<B><TT>ReplyCode()</TT></B> returns the numeric value of the reply code received
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in response to the last command. <B><TT>StatusResponse()</TT></B> returns
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the entire status response from the server, including the reply code. If
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no status response is received, possibly because of a communications error
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or failure, <B><TT>ReplyCode()</TT></B> returns zero and
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<B><TT>StatusResponse()</TT></B> returns an empty string.
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<P>
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The server sends a status response, including a reply code, for all all NNTP
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commands. For some commands, such as when the client requests an article
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body, the server sends a multi-line text response immediately following the
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status response. Multi-line text responses can be received in either of two
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ways. The simplest way is to call the member function
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<B><TT>TextResponse()</TT></B> after a command completes successfully. This
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simple method works fine for non-interactive applications. It can be a problem
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in interactive applications, however, because there is no data to display
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to a user until the entire text response is retrieved. An alternative method
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allows your program to retrieve the text response one line at a time as it
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is received. To use this method, you must define a subclass of
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<B><TT>DwObserver</TT></B> and assign an object of that class to the
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<B><TT>DwNntpClient</TT></B> object using the member function
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<B><TT>SetObserver()</TT></B>. <B><TT>DwObserver</TT></B> is an abstract
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class, declared in protocol.h, that has just one pure virtual member function
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<B><TT>Notify()</TT></B>. After each line of the text response is received,
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<B><TT>DwNntpClient</TT></B> will call the <B><TT>Notify()</TT></B> member
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function of its assigned <B><TT>DwObserver</TT></B> object. Each invocation
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of <B><TT>Notify()</TT></B> should call the <B><TT>DwNntpClient</TT></B>
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member function <B><TT>TextResponse()</TT></B> to retrieve the next line
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of the text response. Note that you cannot use both of these methods at the
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same time: if an observer is assigned, <B><TT>TextResponse()</TT></B> returns
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only the last line received, not the entire multi-line text response.
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<P>
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Certain NNTP commands, such as the POST command, require the NNTP client
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to send multiple lines of text to the server. To perform this bulk data transfer,
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<B><TT>DwNntpClient</TT></B> provides the member function
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<B><TT>SendData()</TT></B>. In the current implementation,
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<B><TT>SendData()</TT></B> does not convert end of line characters, so it
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is your responsibility to convert the end of line characters to CR LF, if
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necessary. (You may use the utility function
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<B><TT>DwToCrLfEol()</TT></B> to do the conversion.)
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<B><TT>SendData()</TT></B> will perform the character stuffing to protect
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'.' at the beginning of a line, and it will append the final [CR LF] '.'
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CR LF. It is possible to divide data and make multiple calls to
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<B><TT>SendData()</TT></B>; however, if you do so, please note the following
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paragraph.
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<P>
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Note: Because of a feature (some might say bug) in the current implementation,
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<B><TT>SendData()</TT></B> will not detect a '.' at the beginning of a line
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if the CR LF '.' sequence is split between two calls to
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<B><TT>SendData()</TT></B>. This problem will probably be resolved in a future
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version, but be aware that such a change will require a change in
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<B><TT>DwNntpClient</TT></B>'s interface.
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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="DwNntpClient">DwNntpClient</A>() </B></FONT>
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<P>
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Initializes the <B><TT>DwNntpClient</TT></B> object. It is possible for the
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constructor to fail. To verify that the constructor succeeded, call the member
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function <B><TT>LastError()</TT></B> and check that it returns zero. (In
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the Win32 implementation, the constructor calls the Winsock function
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<B><TT>WSAStartup()</TT></B>, which may fail.)
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<P>
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<FONT COLOR="teal"><B> virtual int <A NAME="Open">Open</A>(const char* aServer,
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DwUint16 aPort=119) </B></FONT>
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<P>
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Opens a TCP connection to the server <B><TT>aServer</TT></B> at port
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<B><TT>aPort</TT></B>. <B><TT>aServer</TT></B> may be either a host name,
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such as "news.acme.com" or an IP number in dotted decimal format, such as
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"147.81.64.60". The default value for <B><TT>aPort</TT></B> is 119, the
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well-known port for NNTP assigned by the Internet Assigned Numbers Authority
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(IANA).
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<P>
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If the connection attempt succeeds, the server sends a response.
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<B><TT>Open()</TT></B> returns the server's numeric reply code. The full
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response from the server can be retrieved by calling
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<B><TT>StatusResponse()</TT></B>.
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<P>
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If the connection attempt fails, <B><TT>Open()</TT></B> returns 0. To determine
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what error occurred when a connection attempt fails, call the inherited member
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function <B><TT>DwProtocolClient::LastError()</TT></B>. To determine if a
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failure also occurred, call the inherited member function
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<B><TT>DwProtocolClient::LastFailure()</TT></B>.
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<P>
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<FONT COLOR="teal"><B> DwObserver*
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<A NAME="SetObserver">SetObserver</A>(DwObserver* aObserver) </B></FONT>
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<P>
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Sets the observer object that interacts with the
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<B><TT>DwNntpClient</TT></B> object to retrieve a multi-line text response.
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If an observer is set, <B><TT>DwNntpClient</TT></B> will call the observer's
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<B><TT>Notify()</TT></B> method after each line of the text response is received.
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To remove an observer, call <B><TT>SetObserver()</TT></B> with a NULL argument.
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<B><TT>SetObserver()</TT></B> returns the previously set observer, or NULL
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if no observer was previously set.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="ReplyCode">ReplyCode</A>() const
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</B></FONT>
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<P>
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Returns the numeric value of the three-digit reply code received from the
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server in response to the last client command. If no response was received,
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<B><TT>ReplyCode()</TT></B> returns zero.
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<P>
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<FONT COLOR="teal"><B> const DwString&
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<A NAME="StatusResponse">StatusResponse</A>() const </B></FONT>
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<P>
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Returns the entire status response last received from the server. If no response
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was received, perhaps because of a communications failure,
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<B><TT>StatusResponse()</TT></B> returns an empty string.
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<P>
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<FONT COLOR="teal"><B> const DwString&
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<A NAME="TextResponse">TextResponse</A>() const </B></FONT>
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<P>
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If no observer is set for this object, <B><TT>TextResponse()</TT></B> returns
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a string that comprises the entire sequence of lines received from the server.
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Otherwise, if an observer <B><TT>is</TT></B> set for this object,
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<B><TT>TextResponse()</TT></B> returns only the most recent line received.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Article">Article</A>(int aNumber=(-1))
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<BR>
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int Article(const char* aMsgid) </B></FONT>
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<P>
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Sends the NNTP ARTICLE command and returns the reply code received from the
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server. If no response is received, the function returns zero. The optional
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argument <B><TT>aNumber</TT></B> specifies the number of an article to retrieve.
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If <B><TT>Article()</TT></B> is called with the default argument, the ARTICLE
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command is sent to the server with no argument. <B><TT>aMsgId</TT></B> specifies
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the message id of an article to retrieve.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Body">Body</A>(int aNumber=(-1)) <BR>
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int Body(const char* aMsgid) </B></FONT>
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<P>
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Sends the NNTP BODY command and returns the reply code received from the
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server. If no response is received, the function returns zero. The optional
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argument <B><TT>aNumber</TT></B> specifies the number of an article whose
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body should be retrieved. If <B><TT>Body()</TT></B> is called with the default
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argument, the BODY command is sent to the server with no argument.
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<B><TT>aMsgId</TT></B> specifies the message id of the article to access.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Head">Head</A>(int aNumber=(-1)) <BR>
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int Head(const char* aMsgid) </B></FONT>
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<P>
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Sends the NNTP HEAD command and returns the reply code received from the
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server. If no response is received, the function returns zero. The optional
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argument <B><TT>aNumber</TT></B> specifies the number of an article whose
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header lines should be retrieved. If <B><TT>Head()</TT></B> is called with
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the default argument, the HEAD command is sent to the server with no argument.
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<B><TT>aMsgId</TT></B> specifies the message id of the article to access.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Stat">Stat</A>(int aNumber=(-1)) <BR>
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int Stat(const char* aMsgid) </B></FONT>
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<P>
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Sends the NNTP STAT command and returns the reply code received from the
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server. If no response is received, the function returns zero. The optional
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argument <B><TT>aNumber</TT></B> specifies the number of an article to access.
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If <B><TT>Stat()</TT></B> is called with the default argument, the STAT command
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is sent to the server with no argument. <B><TT>aMsgId</TT></B> specifies
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the message id of the article to access.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Group">Group</A>(const char* aNewsgroupName)
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</B></FONT>
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<P>
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Sends the NNTP GROUP command and returns the reply code received from the
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server. The argument <B><TT>aNewsgroupName</TT></B> specifies the newgroup
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to be selected. If no response is received, the function returns zero.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Help">Help</A>() </B></FONT>
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<P>
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Sends the NNTP HELP command and returns the reply code received from the
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server. If no response is received, the function returns zero.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Ihave">Ihave</A>(const char* aMsgId)
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</B></FONT>
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<P>
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Sends the NNTP IHAVE command and returns the reply code received from the
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server. <B><TT>aMsgId</TT></B> specifies the message id of the article to
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be sent. If no response is received, the function returns zero.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Last">Last</A>() </B></FONT>
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<P>
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Sends the NNTP LAST command and returns the reply code received from the
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server. If no response is received, the function returns zero.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="List">List</A>() </B></FONT>
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<P>
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Sends the NNTP LIST command and returns the reply code received from the
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server. If no response is received, the function returns zero.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Newgroups">Newgroups</A>(const char*
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aDate, const char* aTime, DwBool aIsGmt=DwFalse, const char* aDistributions=0)
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</B></FONT>
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<P>
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Sends the NNTP NEWGROUPS command and returns the reply code received from
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the server. If no response is received, the function returns zero.
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<B><TT>aDate</TT></B> is the date in the form YYMMDD, where YY is the two
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digit year, MM is the month, and DD is the day of the month.
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<B><TT>aTime</TT></B> is the time in the form HHMMSS, where HH is hours,
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MM is minutes, and SS is seconds. If <B><TT>aIsGmt</TT></B> is true, the
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optional GMT argument will be sent. <B><TT>aDistributions</TT></B> specifies
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the optional list of distribution groups.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Newnews">Newnews</A>(const char* aNewsgroups,
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const char* aDate, const char* aTime, DwBool aIsGmt=DwFalse, const char*
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aDistribution=0) </B></FONT>
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<P>
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Sends the NNTP NEWNEWS command and returns the reply code received from the
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server. If no response is received, the function returns zero.
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<B><TT>aNewsgroups</TT></B> is the newsgroups argument for the command.
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<B><TT>aDate</TT></B> is the date in the form YYMMDD, where YY is the two
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|
digit year, MM is the month, and DD is the day of the month.
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<B><TT>aTime</TT></B> is the time in the form HHMMSS, where HH is hours,
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MM is minutes, and SS is seconds. If <B><TT>aIsGmt</TT></B> is true, the
|
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|
optional GMT argument will be sent. <B><TT>aDistributions</TT></B> specifies
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|
the optional list of distribution groups.
|
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|
<P>
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<FONT COLOR="teal"><B> int <A NAME="Next">Next</A>() </B></FONT>
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<P>
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Sends the NNTP NEXT command and returns the reply code received from the
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server. If no response is received, perhaps because of an error, the function
|
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|
|
returns zero.
|
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|
<P>
|
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<FONT COLOR="teal"><B> int <A NAME="Post">Post</A>() </B></FONT>
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<P>
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Sends the NNTP POST command and returns the reply code received from the
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|
|
server. If no response is received, perhaps because of an error, the function
|
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|
|
|
returns zero.
|
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|
<P>
|
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<FONT COLOR="teal"><B> int <A NAME="Quit">Quit</A>() </B></FONT>
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<P>
|
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|
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Sends the NNTP QUIT command and returns the reply code received from the
|
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|
|
|
server. If no response is received, perhaps because of an error, the function
|
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|
|
|
returns zero.
|
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|
|
|
<P>
|
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|
|
<FONT COLOR="teal"><B> int <A NAME="Slave">Slave</A>() </B></FONT>
|
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<P>
|
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|
|
|
Sends the NNTP SLAVE command and returns the reply code received from the
|
|
|
|
|
server. If no response is received, perhaps because of an error, the function
|
|
|
|
|
returns zero.
|
|
|
|
|
<P>
|
|
|
|
|
<FONT COLOR="teal"><B> int <A NAME="SendData">SendData</A>(const DwString&
|
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|
|
|
aStr) <BR>
|
|
|
|
|
int SendData(const char* aBuf, int aBufLen) </B></FONT>
|
|
|
|
|
<P>
|
|
|
|
|
Sends bulk data to the server and returns the reply code received. A bulk
|
|
|
|
|
data transfer follows a POST or IHAVE command and is used to send a complete
|
|
|
|
|
article to the server.
|
|
|
|
|
<P>
|
|
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|
|
In the current implementation, <B><TT>SendData()</TT></B> does not convert
|
|
|
|
|
end of line characters, so it is your responsibility to convert the end of
|
|
|
|
|
line characters to CR LF, if necessary. (You may use the utility function
|
|
|
|
|
<B><TT>DwToCrLfEol()</TT></B> to do the conversion.)
|
|
|
|
|
<B><TT>SendData()</TT></B> will perform the character stuffing to protect
|
|
|
|
|
'.' at the beginning of a line, and it will append the final [CR LF] '.'
|
|
|
|
|
CR LF. It is possible to divide the data and make multiple calls to
|
|
|
|
|
<B><TT>SendData()</TT></B>; however, this may cause problems in the current
|
|
|
|
|
implementation if a CR LF '.' sequence is split between calls.
|
|
|
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|
</BODY></HTML>
|
