a660d684ed
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
68 lines
2.7 KiB
TeX
68 lines
2.7 KiB
TeX
\section{\class{wxDDEClient}}\label{wxddeclient}
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\overview{Interprocess communications overview}{ipcoverview}
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A wxDDEClient object represents the client part of a client-server DDE
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(Dynamic Data Exchange) conversation (available in {\it both}\/
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Windows and UNIX).
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To create a client which can communicate with a suitable server,
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you need to derive a class from wxDDEConnection and another from wxDDEClient.
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The custom wxDDEConnection class will intercept communications in
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a `conversation' with a server, and the custom wxDDEServer is required
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so that a user-overriden \helpref{wxDDEClient::OnMakeConnection}{wxddeclientonmakeconnection} member can return
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a wxDDEConnection of the required class, when a connection is made.
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\wxheading{Derived from}
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wxDDEObject
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\wxheading{See also}
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\helpref{wxDDEServer}{wxddeserver}, \helpref{wxDDEConnection}{wxddeconnection},
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the chapter on interprocess communication in the user manual, and
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the programs in {\tt samples/ipc}.
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxDDEClient::wxDDEClient}
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\func{}{wxDDEClient}{\void}
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Constructs a client object.
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\membersection{wxDDEClient::MakeConnection}\label{wxddeclientmakeconnection}
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\func{wxDDEConnection *}{MakeConnection}{\param{const wxString\& }{host}, \param{const wxString\& }{service}, \param{const wxString\& }{topic}}
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Tries to make a connection with a server specified by the host
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(machine name under UNIX, ignored under Windows), service name (must
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contain an integer port number under UNIX), and topic string. If the
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server allows a connection, a wxDDEConnection object will be returned.
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The type of wxDDEConnection returned can be altered by overriding
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the \helpref{wxDDEClient::OnMakeConnection}{wxddeclientonmakeconnection} member to return your own
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derived connection object.
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\membersection{wxDDEClient::OnMakeConnection}\label{wxddeclientonmakeconnection}
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\func{wxDDEConnection *}{OnMakeConnection}{\void}
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The type of \helpref{wxDDEConnection}{wxddeconnection} returned from a \helpref{wxDDEClient::MakeConnection}{wxddeclientmakeconnection} call can
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be altered by deriving the {\bf OnMakeConnection} member to return your
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own derived connection object. By default, an ordinary wxDDEConnection
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object is returned.
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The advantage of deriving your own connection class is that it will
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enable you to intercept messages initiated by the server, such
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as \helpref{wxDDEConnection::OnAdvise}{wxddeconnectiononadvise}. You may also want to
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store application-specific data in instances of the new class.
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\membersection{wxDDEClient::ValidHost}
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\func{bool}{ValidHost}{\param{const wxString\& }{host}}
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Returns TRUE if this is a valid host name, FALSE otherwise. This always
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returns TRUE under MS Windows.
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