compilation fix for wxGetEmptyString() with wxUSE_STL == 1

[wxWidgets.git] / docs / latex / wx / dialup.tex

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Name:        dialup.tex
%% Purpose:     wxDialUpManager documentation
%% Author:      Vadim Zeitlin
%% Modified by:
%% Created:     08.04.00
%% RCS-ID:      $Id$
%% Copyright:   (c) Vadim Zeitlin
%% License:     wxWidgets license
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\section{\class{wxDialUpManager}}\label{wxdialupmanager}

This class encapsulates functions dealing with verifying the connection status
of the workstation (connected to the Internet via a direct connection,
connected through a modem or not connected at all) and to establish this
connection if possible/required (i.e. in the case of the modem).

The program may also wish to be notified about the change in the connection
status (for example, to perform some action when the user connects to the
network the next time or, on the contrary, to stop receiving data from the net
when the user hangs up the modem). For this, you need to use one of the event
macros described below.

This class is different from other wxWidgets classes in that there is at most
one instance of this class in the program accessed via 
\helpref{wxDialUpManager::Create()}{wxdialupmanagercreate} and you can't
create the objects of this class directly.

\wxheading{Derived from}

No base class

\wxheading{Include files}

<wx/dialup.h>

\wxheading{Event table macros}

To be notified about the change in the network connection status, use these
event handler macros to direct input to member functions that take a 
\helpref{wxDialUpEvent}{wxdialupevent} argument.

\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf EVT\_DIALUP\_CONNECTED(func)}}{A connection with the network was established.}
\twocolitem{{\bf EVT\_DIALUP\_DISCONNECTED(func)}}{The connection with the network was lost.}
\end{twocollist}%

\wxheading{See also}

\helpref{dialup sample}{sampledialup}\\
\helpref{wxDialUpEvent}{wxdialupevent}

\latexignore{\rtfignore{\wxheading{Members}}}

\membersection{wxDialUpManager::Create}\label{wxdialupmanagercreate}

\func{wxDialUpManager*}{Create}{\void}

This function should create and return the object of the platform-specific
class derived from wxDialUpManager. You should delete the pointer when you are
done with it.

\membersection{wxDialUpManager::IsOk}\label{wxdialupmanagerisok}

\constfunc{bool}{IsOk}{\void}

Returns {\tt true} if the dialup manager was initialized correctly. If this
function returns {\tt false}, no other functions will work neither, so it is a
good idea to call this function and check its result before calling any other
wxDialUpManager methods

\membersection{wxDialUpManager::\destruct{wxDialUpManager}}\label{wxdialupmanagerdtor}

\func{}{\destruct{wxDialUpManager}}{\void}

Destructor.

\membersection{wxDialUpManager::GetISPNames}\label{wxdialupmanagergetispnames}

\constfunc{size\_t}{GetISPNames}{\param{wxArrayString\& }{names}}

This function is only implemented under Windows.

Fills the array with the names of all possible values for the first
parameter to \helpref{Dial()}{wxdialupmanagerdial} on this machine and returns
their number (may be $0$).

\membersection{wxDialUpManager::Dial}\label{wxdialupmanagerdial}

\func{bool}{Dial}{\param{const wxString\& }{nameOfISP = wxEmptyString}, \param{const wxString\& }{username = wxEmptyString}, \param{const wxString\& }{password = wxEmptyString}, \param{bool }{async = true}}

Dial the given ISP, use {\it username} and {\it password} to authenticate.

The parameters are only used under Windows currently, for Unix you should use 
\helpref{SetConnectCommand}{wxdialupmanagersetconnectcommand} to customize this
functions behaviour.

If no {\it nameOfISP} is given, the function will select the default one
(proposing the user to choose among all connections defined on this machine)
and if no username and/or password are given, the function will try to do
without them, but will ask the user if really needed.

If {\it async} parameter is {\tt false}, the function waits until the end of dialing
and returns {\tt true} upon successful completion.

If {\it async} is {\tt true}, the function only initiates the connection and
returns immediately - the result is reported via events (an event is sent
anyhow, but if dialing failed it will be a DISCONNECTED one).

\membersection{wxDialUpManager::IsDialing}\label{wxdialupmanagerisdialing}

\constfunc{bool}{IsDialing}{\void}

Returns true if (async) dialing is in progress.

\wxheading{See also}

\helpref{Dial}{wxdialupmanagerdial}

\membersection{wxDialUpManager::CancelDialing}\label{wxdialupmanagercanceldialing}

\func{bool}{CancelDialing}{\void}

Cancel dialing the number initiated with \helpref{Dial}{wxdialupmanagerdial} 
with async parameter equal to {\tt true}.

Note that this won't result in DISCONNECTED event being sent.

\wxheading{See also}

\helpref{IsDialing}{wxdialupmanagerisdialing}

\membersection{wxDialUpManager::HangUp}\label{wxdialupmanagerhangup}

\func{bool}{HangUp}{\void}

Hang up the currently active dial up connection.

\membersection{wxDialUpManager::IsAlwaysOnline}\label{wxdialupmanagerisalwaysonline}

\constfunc{bool}{IsAlwaysOnline}{\void}

Returns {\tt true} if the computer has a permanent network connection (i.e. is
on a LAN) and so there is no need to use Dial() function to go online.

{\bf NB:} this functions tries to guess the result and it is not always
guaranteed to be correct, so it is better to ask user for
confirmation or give him a possibility to override it.

\membersection{wxDialUpManager::IsOnline}\label{wxdialupmanagerisonline}

\constfunc{bool}{IsOnline}{\void}

Returns {\tt true} if the computer is connected to the network: under Windows,
this just means that a RAS connection exists, under Unix we check that
the "well-known host" (as specified by 
\helpref{SetWellKnownHost}{wxdialupmanagersetwellknownhost}) is reachable.

\membersection{wxDialUpManager::SetOnlineStatus}\label{wxdialupmanagersetonlinestatus}

\func{void}{SetOnlineStatus}{\param{bool }{isOnline = true}}

Sometimes the built-in logic for determining the online status may fail,
so, in general, the user should be allowed to override it. This function
allows to forcefully set the online status - whatever our internal
algorithm may think about it.

\wxheading{See also}

\helpref{IsOnline}{wxdialupmanagerisonline}

\membersection{wxDialUpManager::EnableAutoCheckOnlineStatus}\label{wxdialupmanagerenableautocheckonlinestatus}

\func{bool}{EnableAutoCheckOnlineStatus}{\param{size\_t }{nSeconds = 60}}

Enable automatic checks for the connection status and sending of 
{\tt wxEVT\_DIALUP\_CONNECTED/wxEVT\_DIALUP\_DISCONNECTED} events. The interval
parameter is only for Unix where we do the check manually and specifies how
often should we repeat the check (each minute by default). Under Windows, the
notification about the change of connection status is sent by the system and so
we don't do any polling and this parameter is ignored.

Returns {\tt false} if couldn't set up automatic check for online status.

\membersection{wxDialUpManager::DisableAutoCheckOnlineStatus}\label{wxdialupmanagerdisableautocheckonlinestatus}

\func{void}{DisableAutoCheckOnlineStatus}{\void}

Disable automatic check for connection status change - notice that the
{\tt wxEVT\_DIALUP\_XXX} events won't be sent any more neither.

\membersection{wxDialUpManager::SetWellKnownHost}\label{wxdialupmanagersetwellknownhost}

\func{void}{SetWellKnownHost}{\param{const wxString\& }{hostname}, \param{int }{portno = 80}}

This method is for Unix only.

Under Unix, the value of well-known host is used to check whether we're
connected to the internet. It is unused under Windows, but this function
is always safe to call. The default value is {\tt www.yahoo.com:80}.

\membersection{wxDialUpManager::SetConnectCommand}\label{wxdialupmanagersetconnectcommand}

\func{}{SetConnectCommand}{\param{const wxString\& }{commandDial = wxT("/usr/bin/pon")}, \param{const wxString\& }{commandHangup = wxT("/usr/bin/poff")}}

This method is for Unix only.

Sets the commands to start up the network and to hang up again.

\wxheading{See also}

\helpref{Dial}{wxdialupmanagerdial}