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\section{\class{wxDDEClient}}\label{wxddeclient}
A wxDDEClient object represents the client part of a client-server DDE
(Dynamic Data Exchange) conversation.
To create a client which can communicate with a suitable server,
you need to derive a class from wxDDEConnection and another from wxDDEClient.
The custom wxDDEConnection class will intercept communications in
a `conversation' with a server, and the custom wxDDEServer is required
so that a user-overridden \helpref{wxDDEClient::OnMakeConnection}{wxddeclientonmakeconnection} member can return
a wxDDEConnection of the required class, when a connection is made.
This DDE-based implementation is
available on Windows only, but a platform-independent, socket-based version
of this API is available using \helpref{wxTCPClient}{wxtcpclient}.
\wxheading{Derived from}
wxClientBase\\
\helpref{wxObject}{wxobject}
\wxheading{Include files}
<wx/dde.h>
\wxheading{See also}
\helpref{wxDDEServer}{wxddeserver}, \helpref{wxDDEConnection}{wxddeconnection},
\helpref{Interprocess communications overview}{ipcoverview}
\latexignore{\rtfignore{\wxheading{Members}}}
\membersection{wxDDEClient::wxDDEClient}\label{wxddeclientctor}
\func{}{wxDDEClient}{\void}
Constructs a client object.
\membersection{wxDDEClient::MakeConnection}\label{wxddeclientmakeconnection}
\func{wxConnectionBase *}{MakeConnection}{\param{const wxString\& }{host}, \param{const wxString\& }{service}, \param{const wxString\& }{topic}}
Tries to make a connection with a server specified by the host
(machine name under UNIX, ignored under Windows), service name (must
contain an integer port number under UNIX), and topic string. If the
server allows a connection, a wxDDEConnection object will be returned.
The type of wxDDEConnection returned can be altered by overriding
the \helpref{wxDDEClient::OnMakeConnection}{wxddeclientonmakeconnection} member to return your own
derived connection object.
\membersection{wxDDEClient::OnMakeConnection}\label{wxddeclientonmakeconnection}
\func{wxConnectionBase *}{OnMakeConnection}{\void}
The type of \helpref{wxDDEConnection}{wxddeconnection} returned from a \helpref{wxDDEClient::MakeConnection}{wxddeclientmakeconnection} call can
be altered by deriving the {\bf OnMakeConnection} member to return your
own derived connection object. By default, a wxDDEConnection
object is returned.
The advantage of deriving your own connection class is that it will
enable you to intercept messages initiated by the server, such
as \helpref{wxDDEConnection::OnAdvise}{wxconnectiononadvise}. You may also want to
store application-specific data in instances of the new class.
\membersection{wxDDEClient::ValidHost}\label{wxddeclientvalidhost}
\func{bool}{ValidHost}{\param{const wxString\& }{host}}
Returns \true if this is a valid host name, \false otherwise. This always
returns \true under MS Windows.
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