f510b7b2f3
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29647 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
202 lines
8.7 KiB
TeX
202 lines
8.7 KiB
TeX
\section{\class{wxDDEConnection}}\label{wxddeconnection}
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A wxDDEConnection object represents the connection between a client and a
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server. It can be created by making a connection using a\rtfsp
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\helpref{wxDDEClient}{wxddeclient} object, or by the acceptance of a connection by a\rtfsp
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\helpref{wxDDEServer}{wxddeserver} object. The bulk of a DDE (Dynamic Data Exchange)
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conversation is controlled by
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calling members in a {\bf wxDDEConnection} object or by overriding its
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members.
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An application should normally derive a new connection class from
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wxDDEConnection, in order to override the communication event handlers
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to do something interesting.
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This DDE-based implementation is available on Windows only,
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but a platform-independent, socket-based version
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of this API is available using \helpref{wxTCPConnection}{wxtcpconnection}.
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\wxheading{Derived from}
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wxConnectionBase\\
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/dde.h>
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\wxheading{Types}
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\index{wxIPCFormat}wxIPCFormat is defined as follows:
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\begin{verbatim}
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enum wxIPCFormat
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{
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wxIPC_INVALID = 0,
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wxIPC_TEXT = 1, /* CF_TEXT */
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wxIPC_BITMAP = 2, /* CF_BITMAP */
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wxIPC_METAFILE = 3, /* CF_METAFILEPICT */
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wxIPC_SYLK = 4,
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wxIPC_DIF = 5,
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wxIPC_TIFF = 6,
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wxIPC_OEMTEXT = 7, /* CF_OEMTEXT */
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wxIPC_DIB = 8, /* CF_DIB */
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wxIPC_PALETTE = 9,
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wxIPC_PENDATA = 10,
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wxIPC_RIFF = 11,
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wxIPC_WAVE = 12,
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wxIPC_UNICODETEXT = 13,
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wxIPC_ENHMETAFILE = 14,
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wxIPC_FILENAME = 15, /* CF_HDROP */
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wxIPC_LOCALE = 16,
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wxIPC_PRIVATE = 20
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};
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\end{verbatim}
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\wxheading{See also}
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\helpref{wxDDEClient}{wxddeclient}, \helpref{wxDDEServer}{wxddeserver}, \helpref{Interprocess communications overview}{ipcoverview}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxDDEConnection::wxDDEConnection}\label{wxddeconnectionctor}
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\func{}{wxDDEConnection}{\void}
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\func{}{wxDDEConnection}{\param{char* }{buffer}, \param{int}{ size}}
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Constructs a connection object. If no user-defined connection object is
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to be derived from wxDDEConnection, then the constructor should not be
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called directly, since the default connection object will be provided on
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requesting (or accepting) a connection. However, if the user defines his
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or her own derived connection object, the \helpref{wxDDEServer::OnAcceptConnection}{wxddeserveronacceptconnection}\rtfsp
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and/or \helpref{wxDDEClient::OnMakeConnection}{wxddeclientonmakeconnection} members should be replaced by
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functions which construct the new connection object. If the arguments of
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the wxDDEConnection constructor are void, then a default buffer is
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associated with the connection. Otherwise, the programmer must provide a
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a buffer and size of the buffer for the connection object to use in
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transactions.
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\membersection{wxDDEConnection::Advise}\label{wxddeconnectionadvise}
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\func{bool}{Advise}{\param{const wxString\& }{item}, \param{char* }{data}, \param{int}{ size = -1}, \param{wxIPCFormat}{ format = wxCF\_TEXT}}
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Called by the server application to advise the client of a change in
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the data associated with the given item. Causes the client
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connection's \helpref{wxDDEConnection::OnAdvise}{wxddeconnectiononadvise}
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member to be called. Returns true if successful.
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\membersection{wxDDEConnection::Execute}\label{wxddeconnectionexecute}
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\func{bool}{Execute}{\param{char* }{data}, \param{int}{ size = -1}, \param{wxIPCFormat}{ format = wxCF\_TEXT}}
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Called by the client application to execute a command on the server. Can
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also be used to transfer arbitrary data to the server (similar
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to \helpref{wxDDEConnection::Poke}{wxddeconnectionpoke} in that respect). Causes the
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server connection's \helpref{wxDDEConnection::OnExecute}{wxddeconnectiononexecute} member to be
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called. Returns true if successful.
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\membersection{wxDDEConnection::Disconnect}\label{wxddeconnectiondisconnect}
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\func{bool}{Disconnect}{\void}
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Called by the client or server application to disconnect from the other
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program; it causes the \helpref{wxDDEConnection::OnDisconnect}{wxddeconnectionondisconnect} message
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to be sent to the corresponding connection object in the other
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program. The default behaviour of {\bf OnDisconnect} is to delete the
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connection, but the calling application must explicitly delete its
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side of the connection having called {\bf Disconnect}. Returns true if
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successful.
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\membersection{wxDDEConnection::OnAdvise}\label{wxddeconnectiononadvise}
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\func{virtual bool}{OnAdvise}{\param{const wxString\& }{topic}, \param{const wxString\& }{item}, \param{char* }{data}, \param{int}{ size}, \param{wxIPCFormat}{ format}}
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Message sent to the client application when the server notifies it of a
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change in the data associated with the given item.
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\membersection{wxDDEConnection::OnDisconnect}\label{wxddeconnectionondisconnect}
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\func{virtual bool}{OnDisconnect}{\void}
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Message sent to the client or server application when the other
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application notifies it to delete the connection. Default behaviour is
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to delete the connection object.
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\membersection{wxDDEConnection::OnExecute}\label{wxddeconnectiononexecute}
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\func{virtual bool}{OnExecute}{\param{const wxString\& }{topic}, \param{char* }{data}, \param{int}{ size}, \param{wxIPCFormat}{ format}}
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Message sent to the server application when the client notifies it to
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execute the given data. Note that there is no item associated with
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this message.
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\membersection{wxDDEConnection::OnPoke}\label{wxddeconnectiononpoke}
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\func{virtual bool}{OnPoke}{\param{const wxString\& }{topic}, \param{const wxString\& }{item}, \param{char* }{data}, \param{int}{ size}, \param{wxIPCFormat}{ format}}
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Message sent to the server application when the client notifies it to
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accept the given data.
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\membersection{wxDDEConnection::OnRequest}\label{wxddeconnectiononrequest}
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\func{virtual char*}{OnRequest}{\param{const wxString\& }{topic}, \param{const wxString\& }{item}, \param{int *}{size}, \param{wxIPCFormat}{ format}}
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Message sent to the server application when the client
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calls \helpref{wxDDEConnection::Request}{wxddeconnectionrequest}. The server
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should respond by returning a character string from {\bf OnRequest},
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or NULL to indicate no data.
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\membersection{wxDDEConnection::OnStartAdvise}\label{wxddeconnectiononstartadvise}
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\func{virtual bool}{OnStartAdvise}{\param{const wxString\& }{topic}, \param{const wxString\& }{item}}
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Message sent to the server application by the client, when the client
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wishes to start an `advise loop' for the given topic and item. The
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server can refuse to participate by returning false.
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\membersection{wxDDEConnection::OnStopAdvise}\label{wxddeconnectiononstopadvise}
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\func{virtual bool}{OnStopAdvise}{\param{const wxString\& }{topic}, \param{const wxString\& }{item}}
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Message sent to the server application by the client, when the client
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wishes to stop an `advise loop' for the given topic and item. The
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server can refuse to stop the advise loop by returning false, although
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this doesn't have much meaning in practice.
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\membersection{wxDDEConnection::Poke}\label{wxddeconnectionpoke}
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\func{bool}{Poke}{\param{const wxString\& }{item}, \param{char* }{data}, \param{int}{ size = -1}, \param{wxIPCFormat}{ format = wxCF\_TEXT}}
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Called by the client application to poke data into the server. Can be
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used to transfer arbitrary data to the server. Causes the server
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connection's \helpref{wxDDEConnection::OnPoke}{wxddeconnectiononpoke} member
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to be called. Returns true if successful.
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\membersection{wxDDEConnection::Request}\label{wxddeconnectionrequest}
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\func{char*}{Request}{\param{const wxString\& }{item}, \param{int *}{size}, \param{wxIPCFormat}{ format = wxIPC\_TEXT}}
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Called by the client application to request data from the server. Causes
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the server connection's \helpref{wxDDEConnection::OnRequest}{wxddeconnectiononrequest} member to be called. Returns a
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character string (actually a pointer to the connection's buffer) if
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successful, NULL otherwise.
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\membersection{wxDDEConnection::StartAdvise}\label{wxddeconnectionstartadvise}
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\func{bool}{StartAdvise}{\param{const wxString\& }{item}}
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Called by the client application to ask if an advise loop can be started
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with the server. Causes the server connection's \helpref{wxDDEConnection::OnStartAdvise}{wxddeconnectiononstartadvise}\rtfsp
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member to be called. Returns true if the server okays it, false
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otherwise.
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\membersection{wxDDEConnection::StopAdvise}\label{wxddeconnectionstopadvise}
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\func{bool}{StopAdvise}{\param{const wxString\& }{item}}
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Called by the client application to ask if an advise loop can be
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stopped. Causes the server connection's \helpref{wxDDEConnection::OnStopAdvise}{wxddeconnectiononstopadvise} member
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to be called. Returns true if the server okays it, false otherwise.
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