X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/6244848856584171db8cd74a7ff227250e46cc54..dc484d491b15355285a89da275c58c2ef247d1f4:/docs/latex/wx/log.tex diff --git a/docs/latex/wx/log.tex b/docs/latex/wx/log.tex index de29116f55..04e2889690 100644 --- a/docs/latex/wx/log.tex +++ b/docs/latex/wx/log.tex @@ -1,6 +1,17 @@ +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% Name: log.tex +%% Purpose: wxLog and related classes documentation +%% Author: Vadim Zeitlin +%% Modified by: +%% Created: some time ago +%% RCS-ID: $Id$ +%% Copyright: (c) 1997-2001 Vadim Zeitlin +%% License: wxWindows license +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + \section{\class{wxLog}}\label{wxlog} -wxLog class defines the interface for the {\it log targets} used by wxWindows +wxLog class defines the interface for the {\it log targets} used by wxWidgets logging functions as explained in the \helpref{wxLog overview}{wxlogoverview}. The only situations when you need to directly use this class is when you want to derive your own log target because the existing ones don't satisfy your @@ -12,43 +23,61 @@ completely) the timestamp on the messages. Otherwise, it is completely hidden behind the {\it wxLogXXX()} functions and you may not even know about its existence. -See \helpref{log overview}{wxlogoverview} for the descriptions of wxWindows +See \helpref{log overview}{wxlogoverview} for the descriptions of wxWidgets logging facilities. \wxheading{Derived from} No base class +\wxheading{Include files} + + + \latexignore{\rtfignore{\wxheading{Function groups}}} -\membersection{Static functions} +\membersection{Global functions} The functions in this section work with and manipulate the active log target. -The {\it OnLog()} is called by the {\it wxLogXXX()} functions and invokes the -{\it DoLog()} of the active log target if any. Get/Set methods are used to -install/query the current active target and, finally, {\it -DontCreateOnDemand()} disables the automatic creation of a standard log target -if none actually exists. It is only useful when the application is terminating -and shouldn't be used in other situations because it may easily lead to a loss -of messages. +The \helpref{OnLog()}{wxlogonlog} is called by the {\it wxLogXXX()} functions +and invokes the \helpref{DoLog()}{wxlogdolog} of the active log target if any. +Get/Set methods are used to install/query the current active target and, +finally, \helpref{DontCreateOnDemand()}{wxlogdontcreateondemand} disables the +automatic creation of a standard log target if none actually exists. It is +only useful when the application is terminating and shouldn't be used in other +situations because it may easily lead to a loss of messages. \helpref{OnLog}{wxlogonlog}\\ \helpref{GetActiveTarget}{wxloggetactivetarget}\\ \helpref{SetActiveTarget}{wxlogsetactivetarget}\\ -\helpref{DontCreateOnDemand}{wxlogdontcreateondemand} - -\membersection{Message buffering} - -Some of wxLog implementations, most notably the standard -wxLogGui class, buffer the messages (for example, to avoid -showing the user a zillion of modal message boxes one after another - which -would be really annoying). {\it Flush()} shows them all and clears the buffer -contents. Although this function doesn't do anything if the buffer is already -empty, {\it HasPendingMessages()} is also provided which allows to explicitly -verify it. +\helpref{DontCreateOnDemand}{wxlogdontcreateondemand}\\ +\helpref{Suspend}{wxlogsuspend}\\ +\helpref{Resume}{wxlogresume} + +\membersection{Logging functions}\label{loggingfunctions} + +There are two functions which must be implemented by any derived class to +actually process the log messages: \helpref{DoLog}{wxlogdolog} and +\helpref{DoLogString}{wxlogdologstring}. The second function receives a string +which just has to be output in some way and the easiest way to write a new log +target is to override just this function in the derived class. If more control +over the output format is needed, then the first function must be overridden +which allows to construct custom messages depending on the log level or even +do completely different things depending on the message severity (for example, +throw away all messages except warnings and errors, show warnings on the +screen and forward the error messages to the user's (or programmer's) cell +phone - maybe depending on whether the timestamp tells us if it is day or +night in the current time zone). + +There also functions to support message buffering. Why are they needed? +Some of wxLog implementations, most notably the standard wxLogGui class, +buffer the messages (for example, to avoid showing the user a zillion of modal +message boxes one after another -- which would be really annoying). +\helpref{Flush()}{wxlogflush} shows them all and clears the buffer contents. +This function doesn't do anything if the buffer is already empty. \helpref{Flush}{wxlogflush}\\ -\helpref{HasPendingMessages}{haspendingmessages} +\helpref{FlushActive}{wxlogflushactive} \membersection{Customization}\label{wxlogcustomization} @@ -57,45 +86,78 @@ without writing a new log target class (which, aside of being a matter of several minutes, allows you to do anything you want). The verbose messages are the trace messages which are not disabled in the -release mode and are generated by {\it wxLogVerbose()}. They are not normally -shown to the user because they present little interest, but may be activated, -for example, in order to help the user find some program problem. - -As for the (real) trace messages, they come in different kinds: - -\begin{itemize}\itemsep=0pt -\item{wxTraceMemAlloc} for the messages about creating and deleting objects -\item{wxTraceMessages} for tracing the windowing system messages/events -\item{wxTraceResAlloc} for allocating and releasing the system ressources -\item{wxTraceRefCount} for reference counting related messages -\item{wxTraceOleCalls} for the OLE (or COM) method invocations (wxMSW only) -\item{other} the remaining bits are free for user-defined trace levels -\end{itemize} - -The trace mask is a bit mask which tells which (if any) of these trace -messages are going to be actually logged. For the trace message to appear -somewhere, all the bits in the mask used in the call to {\it wxLogTrace()} -function must be set in the current trace mask. For example, +release mode and are generated by \helpref{wxLogVerbose}{wxlogverbose}. They +are not normally shown to the user because they present little interest, but +may be activated, for example, in order to help the user find some program +problem. + +As for the (real) trace messages, their handling depends on the settings of +the (application global) {\it trace mask}. There are two ways to specify it: +either by using \helpref{SetTraceMask}{wxlogsettracemask} and +\helpref{GetTraceMask}{wxloggettracemask} and using +\helpref{wxLogTrace}{wxlogtrace} which takes an integer mask or by using +\helpref{AddTraceMask}{wxlogaddtracemask} for string trace masks. + +The difference between bit-wise and string trace masks is that a message using +integer trace mask will only be logged if all bits of the mask are set in the +current mask while a message using string mask will be logged simply if the +mask had been added before to the list of allowed ones. + +For example, + +\begin{verbatim} +// wxTraceOleCalls is one of standard bit masks +wxLogTrace(wxTraceRefCount | wxTraceOleCalls, "Active object ref count: %d", nRef); +\end{verbatim} +will do something only if the current trace mask contains both +{\tt wxTraceRefCount} and {\tt wxTraceOle}, but + +\begin{verbatim} +// wxTRACE_OleCalls is one of standard string masks +wxLogTrace(wxTRACE_OleCalls, "IFoo::Bar() called"); +\end{verbatim} + +will log the message if it was preceded by + \begin{verbatim} -wxLogTrace(wxTraceRefCount | wxTraceOle, "Active object ref count: %d", nRef); +wxLog::AddTraceMask(wxTRACE_OleCalls); \end{verbatim} -will do something only if the current trace mask contains both wxTraceRefCount -and wxTraceOle. + +Using string masks is simpler and allows to easily add custom ones, so this is +the preferred way of working with trace messages. The integer trace mask is +kept for compatibility and for additional (but very rarely needed) flexibility +only. + +The standard trace masks are given in \helpref{wxLogTrace}{wxlogtrace} +documentation. Finally, the {\it wxLog::DoLog()} function automatically prepends a time stamp to all the messages. The format of the time stamp may be changed: it can be -any string with \% specificators fully described in the documentation of the +any string with \% specifications fully described in the documentation of the standard {\it strftime()} function. For example, the default format is "[\%d/\%b/\%y \%H:\%M:\%S] " which gives something like "[17/Sep/98 22:10:16] " (without quotes) for the current date. Setting an empty string as the time format disables timestamping of the messages completely. +{\bf NB:} Timestamping is disabled for Visual C++ users in debug builds by +default because otherwise it would be impossible to directly go to the line +from which the log message was generated by simply clicking in the debugger +window on the corresponding error message. If you wish to enable it, please use +\helpref{SetTimestamp}{wxlogsettimestamp} explicitly. + +\helpref{AddTraceMask}{wxlogaddtracemask}\\ +\helpref{RemoveTraceMask}{wxlogremovetracemask}\\ +\helpref{ClearTraceMasks}{wxlogcleartracemasks}\\ +\helpref{GetTraceMasks}{wxloggettracemasks}\\ +\helpref{IsAllowedTraceMask}{wxlogisallowedtracemask}\\ \helpref{SetVerbose}{wxlogsetverbose}\\ \helpref{GetVerbose}{wxloggetverbose}\\ -\helpref{SetTimeStampFormat}{wxlogsettimestampformat}\\ -\helpref{GetTimeStampFormat}{wxloggettimestampformat}\\ +\helpref{SetTimestamp}{wxlogsettimestamp}\\ +\helpref{GetTimestamp}{wxloggettimestamp}\\ \helpref{SetTraceMask}{wxlogsettracemask}\\ -\helpref{GetTraceMask}{wxloggettracemask} +\helpref{GetTraceMask}{wxloggettracemask}\\ +\helpref{SetRepetitionCounting}{wxlogsetrepetitioncounting}\\ +\helpref{GetRepetitionCounting}{wxloggetrepetitioncounting} %%%%% MEMBERS HERE %%%%% \helponly{\insertatlevel{2}{ @@ -104,6 +166,39 @@ format disables timestamping of the messages completely. }} +\membersection{wxLog::AddTraceMask}\label{wxlogaddtracemask} + +\func{static void}{AddTraceMask}{\param{const wxString\& }{mask}} + +Add the {\it mask} to the list of allowed masks for +\helpref{wxLogTrace}{wxlogtrace}. + +\wxheading{See also} + +\helpref{RemoveTraceMask}{wxlogremovetracemask} +\helpref{GetTraceMasks}{wxloggettracemasks} + +\membersection{wxLog::ClearTraceMasks}\label{wxlogcleartracemasks} + +\func{static void}{ClearTraceMasks}{\void} + +Removes all trace masks previously set with +\helpref{AddTraceMask}{wxlogaddtracemask}. + +\wxheading{See also} + +\helpref{RemoveTraceMask}{wxlogremovetracemask} + +\membersection{wxLog::GetTraceMasks}\label{wxloggettracemasks} + +\func{static const wxArrayString \&}{GetTraceMasks}{\void} + +Returns the currently allowed list of string trace masks. + +\wxheading{See also} + +\helpref{AddTraceMask}{wxlogaddtracemask}. + \membersection{wxLog::OnLog}\label{wxlogonlog} \func{static void}{OnLog}{\param{wxLogLevel }{ level}, \param{const char * }{ message}} @@ -122,14 +217,69 @@ Returns the pointer to the active log target (may be NULL). \func{static wxLog *}{SetActiveTarget}{\param{wxLog * }{ logtarget}} Sets the specified log target as the active one. Returns the pointer to the -previous active log target (may be NULL). +previous active log target (may be NULL). To suppress logging use a new +instance of wxLogNull not NULL. If the active log target is set to NULL a +new default log target will be created when logging occurs. + +\membersection{wxLog::Suspend}\label{wxlogsuspend} + +\func{static void}{Suspend}{\void} + +Suspends the logging until \helpref{Resume}{wxlogresume} is called. Note that +the latter must be called the same number of times as the former to undo it, +i.e. if you call Suspend() twice you must call Resume() twice as well. + +Note that suspending the logging means that the log sink won't be be flushed +periodically, it doesn't have any effect if the current log target does the +logging immediately without waiting for \helpref{Flush}{wxlogflush} to be +called (the standard GUI log target only shows the log dialog when it is +flushed, so Suspend() works as expected with it). + +\wxheading{See also} + +\helpref{Resume}{wxlogresume},\\ +\helpref{wxLogNull}{wxlogoverview} + +\membersection{wxLog::Resume}\label{wxlogresume} + +\func{static void}{Resume}{\void} + +Resumes logging previously suspended by a call to +\helpref{Suspend}{wxlogsuspend}. All messages logged in the meanwhile will be +flushed soon. + +\membersection{wxLog::DoLog}\label{wxlogdolog} + +\func{virtual void}{DoLog}{\param{wxLogLevel }{level}, \param{const wxChar }{*msg}, \param{time\_t }{timestamp}} + +Called to process the message of the specified severity. {\it msg} is the text +of the message as specified in the call of {\it wxLogXXX()} function which +generated it and {\it timestamp} is the moment when the message was generated. + +The base class version prepends the timestamp to the message, adds a prefix +corresponding to the log level and then calls +\helpref{DoLogString}{wxlogdologstring} with the resulting string. + +\membersection{wxLog::DoLogString}\label{wxlogdologstring} + +\func{virtual void}{DoLogString}{\param{const wxChar }{*msg}, \param{time\_t }{timestamp}} + +Called to log the specified string. The timestamp is already included into the +string but still passed to this function. + +A simple implementation may just send the string to {\tt stdout} or, better, +{\tt stderr}. \membersection{wxLog::DontCreateOnDemand}\label{wxlogdontcreateondemand} \func{static void}{DontCreateOnDemand}{\void} Instructs wxLog to not create new log targets on the fly if there is none -currently. (Almost) for internal use only. +currently. (Almost) for internal use only: it is supposed to be called by the +application shutdown code. + +Note that this function also calls +\helpref{ClearTraceMasks}{wxlogcleartracemasks}. \membersection{wxLog::Flush}\label{wxlogflush} @@ -138,38 +288,69 @@ currently. (Almost) for internal use only. Shows all the messages currently in buffer and clears it. If the buffer is already empty, nothing happens. -\membersection{wxLog::HasPendingMessages}\label{haspendingmessages} +\membersection{wxLog::FlushActive}\label{wxlogflushactive} + +\func{static void}{FlushActive}{\void} + +Flushes the current log target if any, does nothing if there is none. -\constfunc{bool}{HasPendingMessages}{\void} +\wxheading{See also} -Returns true if there are any messages in the buffer (not yet shown to the -user). (Almost) for internal use only. +\helpref{Flush}{wxlogflush} \membersection{wxLog::SetVerbose}\label{wxlogsetverbose} -\func{void}{SetVerbose}{\param{bool }{ verbose = TRUE}} +\func{static void}{SetVerbose}{\param{bool }{ verbose = true}} -Activates or desactivates verbose mode in which the verbose messages are +Activates or deactivates verbose mode in which the verbose messages are logged as the normal ones instead of being silently dropped. \membersection{wxLog::GetVerbose}\label{wxloggetverbose} -\constfunc{bool}{GetVerbose}{\void} +\func{static bool}{GetVerbose}{\void} Returns whether the verbose mode is currently active. -\membersection{wxLog::SetTimeStampFormat}\label{wxlogsettimestampformat} +\membersection{wxLog::SetLogLevel}\label{wxlogsetloglevel} + +\func{static void}{SetLogLevel}{\param{wxLogLevel }{ logLevel}} + +Specifies that log messages with $level > logLevel$ should be ignored +and not sent to the active log target. + +\membersection{wxLog::GetLogLevel}\label{wxloggetloglevel} + +\func{static wxLogLevel}{GetLogLevel}{\void} + +Returns the current log level limit. + +\membersection{wxLog::SetRepetitionCounting}\label{wxlogsetrepetitioncounting} + +\func{static void}{SetRepetitionCounting}{\param{bool }{ repetCounting = true}} -\func{void}{SetTimeStampFormat}{\param{const char * }{ format}} +Enables logging mode in which a log message is logged once, and in case exactly +the same message successively repeats one or more times, only the number of +repetitions is logged. + +\membersection{wxLog::GetRepetitionCounting}\label{wxloggetrepetitioncounting} + +\func{static bool}{GetRepetitionCounting}{\void} + +Returns whether the repetition counting mode is enabled. + + +\membersection{wxLog::SetTimestamp}\label{wxlogsettimestamp} + +\func{void}{SetTimestamp}{\param{const char * }{ format}} Sets the timestamp format prepended by the default log targets to all messages. The string may contain any normal characters as well as \% prefixed format specificators, see {\it strftime()} manual for details. -Passing an empty string to this function disables message timestamping. +Passing a NULL value (not empty string) to this function disables message timestamping. -\membersection{wxLog::GetTimeStampFormat}\label{wxloggettimestampformat} +\membersection{wxLog::GetTimestamp}\label{wxloggettimestamp} -\constfunc{const char *}{GetTimeStampFormat}{\void} +\constfunc{const char *}{GetTimestamp}{\void} Returns the current timestamp format string. @@ -185,3 +366,403 @@ section for details. Returns the current trace mask, see \helpref{Customization}{wxlogcustomization} section for details. +\membersection{wxLog::IsAllowedTraceMask}\label{wxlogisallowedtracemask} + +\func{static bool}{IsAllowedTraceMask}{\param{const wxChar *}{mask}} + +Returns true if the {\it mask} is one of allowed masks for +\helpref{wxLogTrace}{wxlogtrace}. + +See also: \helpref{AddTraceMask}{wxlogaddtracemask}, +\helpref{RemoveTraceMask}{wxlogremovetracemask} + +\membersection{wxLog::RemoveTraceMask}\label{wxlogremovetracemask} + +\func{static void}{RemoveTraceMask}{\param{const wxString\& }{mask}} + +Remove the {\it mask} from the list of allowed masks for +\helpref{wxLogTrace}{wxlogtrace}. + +See also: \helpref{AddTraceMask}{wxlogaddtracemask} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% wxLogChain %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\section{\class{wxLogChain}}\label{wxlogchain} + +This simple class allows to chain log sinks, that is to install a new sink but +keep passing log messages to the old one instead of replacing it completely as +\helpref{SetActiveTarget}{wxlogsetactivetarget} does. + +It is especially useful when you want to divert the logs somewhere (for +example to a file or a log window) but also keep showing the error messages +using the standard dialogs as \helpref{wxLogGui}{wxlogoverview} does by default. + +Example of usage: + +\begin{verbatim} +wxLogChain *logChain = new wxLogChain(new wxLogStderr); + +// all the log messages are sent to stderr and also processed as usually +... + +// don't delete logChain directly as this would leave a dangling +// pointer as active log target, use SetActiveTarget() instead +delete wxLog::SetActiveTarget(...something else or NULL...); + +\end{verbatim} + +\wxheading{Derived from} + +\helpref{wxLog}{wxlog} + +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxLogChain::wxLogChain}\label{wxlogchainctor} + +\func{}{wxLogChain}{\param{wxLog *}{logger}} + +Sets the specified {\tt logger} (which may be {\tt NULL}) as the default log +target but the log messages are also passed to the previous log target if any. + +\membersection{wxLogChain::\destruct{wxLogChain}}\label{wxlogchaindtor} + +\func{}{\destruct{wxLogChain}}{\void} + +Destroys the previous log target. + +\membersection{wxLogChain::GetOldLog}\label{wxlogchaingetoldlog} + +\constfunc{wxLog *}{GetOldLog}{\void} + +Returns the pointer to the previously active log target (which may be {\tt +NULL}). + +\membersection{wxLogChain::IsPassingMessages}\label{wxlogchainispassingmessages} + +\constfunc{bool}{IsPassingMessages}{\void} + +Returns {\tt true} if the messages are passed to the previously active log +target (default) or {\tt false} if \helpref{PassMessages}{wxlogchainpassmessages} +had been called. + +\membersection{wxLogChain::PassMessages}\label{wxlogchainpassmessages} + +\func{void}{PassMessages}{\param{bool }{passMessages}} + +By default, the log messages are passed to the previously active log target. +Calling this function with {\tt false} parameter disables this behaviour +(presumably temporarily, as you shouldn't use wxLogChain at all otherwise) and +it can be reenabled by calling it again with {\it passMessages} set to {\tt +true}. + +\membersection{wxLogChain::SetLog}\label{wxlogchainsetlog} + +\func{void}{SetLog}{\param{wxLog *}{logger}} + +Sets another log target to use (may be {\tt NULL}). The log target specified +in the \helpref{constructor}{wxlogchainctor} or in a previous call to +this function is deleted. + +This doesn't change the old log target value (the one the messages are +forwarded to) which still remains the same as was active when wxLogChain +object was created. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% wxLogGui %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\section{\class{wxLogGui}}\label{wxloggui} + +This is the default log target for the GUI wxWidgets applications. It is passed +to \helpref{wxLog::SetActiveTarget}{wxlogsetactivetarget} at the program +startup and is deleted by wxWidgets during the program shut down. + +\wxheading{Derived from} + +\helpref{wxLog}{wxlog} + +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxLogGui::wxLogGui}\label{wxlogguictor} + +\func{}{wxLogGui}{\void} + +Default constructor. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% wxLogNull %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\section{\class{wxLogNull}}\label{wxlognull} + +This class allows to temporarily suspend logging. All calls to the log +functions during the life time of an object of this class are just ignored. + +In particular, it can be used to suppress the log messages given by wxWidgets +itself but it should be noted that it is rarely the best way to cope with this +problem as {\bf all} log messages are suppressed, even if they indicate a +completely different error than the one the programmer wanted to suppress. + +For instance, the example of the overview: + +{\small +\begin{verbatim} + wxFile file; + + // wxFile.Open() normally complains if file can't be opened, we don't want it + { + wxLogNull logNo; + if ( !file.Open("bar") ) + ... process error ourselves ... + } // ~wxLogNull called, old log sink restored + + wxLogMessage("..."); // ok +\end{verbatim} +}% + +would be better written as: + +{\small +\begin{verbatim} + wxFile file; + + // don't try to open file if it doesn't exist, we are prepared to deal with + // this ourselves - but all other errors are not expected + if ( wxFile::Exists("bar") ) + { + // gives an error message if the file couldn't be opened + file.Open("bar"); + } + else + { + ... + } +\end{verbatim} +}% + +\wxheading{Derived from} + +\helpref{wxLog}{wxlog} + +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxLogNull::wxLogNull}\label{wxlognullctor} + +\func{}{wxLogNull}{\void} + +Suspends logging. + +\membersection{wxLogNull::\destruct{wxLogNull}}\label{wxlognulldtor} + +Resumes logging. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% wxLogPassThrough %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\section{\class{wxLogPassThrough}}\label{wxlogpassthrough} + +A special version of \helpref{wxLogChain}{wxlogchain} which uses itself as the +new log target. Maybe more clearly, it means that this is a log target which +forwards the log messages to the previously installed one in addition to +processing them itself. + +Unlike \helpref{wxLogChain}{wxlogchain} which is usually used directly as is, +this class must be derived from to implement \helpref{DoLog}{wxlogdolog} +and/or \helpref{DoLogString}{wxlogdologstring} methods. + +\wxheading{Derived from} + +\helpref{wxLogChain}{wxlogchain} + +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxLogPassThrough::wxLogPassThrough}\label{wxlogpassthroughctor} + +Default ctor installs this object as the current active log target. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% wxLogStderr %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\section{\class{wxLogStderr}}\label{wxlogstderr} + +This class can be used to redirect the log messages to a C file stream (not to +be confused with C++ streams). It is the default log target for the non-GUI +wxWidgets applications which send all the output to {\tt stderr}. + +\wxheading{Derived from} + +\helpref{wxLog}{wxlog} + +\wxheading{Include files} + + + +\wxheading{See also} + +\helpref{wxLogStream}{wxlogstream} + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxLogStderr::wxLogStderr}\label{wxlogstderrctor} + +\func{}{wxLogStderr}{\param{FILE }{*fp = NULL}} + +Constructs a log target which sends all the log messages to the given +{\tt FILE}. If it is {\tt NULL}, the messages are sent to {\tt stderr}. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% wxLogStream %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\section{\class{wxLogStream}}\label{wxlogstream} + +This class can be used to redirect the log messages to a C++ stream. + +Please note that this class is only available if wxWidgets was compiled with +the standard iostream library support ({\tt wxUSE\_STD\_IOSTREAM} must be on). + +\wxheading{Derived from} + +\helpref{wxLog}{wxlog} + +\wxheading{Include files} + + + +\wxheading{See also} + +\helpref{wxLogStderr}{wxlogstderr},\\ +\helpref{wxStreamToTextRedirector}{wxstreamtotextredirector} + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxLogStream::wxLogStream}\label{wxlogstreamctor} + +\func{}{wxLogStream}{\param{std::ostream }{*ostr = NULL}} + +Constructs a log target which sends all the log messages to the given +output stream. If it is {\tt NULL}, the messages are sent to {\tt cerr}. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% wxLogTextCtrl %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\section{\class{wxLogTextCtrl}}\label{wxlogtextctrl} + +Using these target all the log messages can be redirected to a text control. +The text control must have been created with {\tt wxTE\_MULTILINE} style by the +caller previously. + +\wxheading{Derived from} + +\helpref{wxLog}{wxlog} + +\wxheading{Include files} + + + +\wxheading{See also} + +\helpref{wxTextCtrl}{wxtextctrl},\\ +\helpref{wxStreamToTextRedirector}{wxstreamtotextredirector} + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxLogTextCtrl::wxLogTextCtrl}\label{wxlogtextctrlctor} + +\func{}{wxLogTextCtrl}{\param{wxTextCtrl }{*textctrl}} + +Constructs a log target which sends all the log messages to the given text +control. The {\it textctrl} parameter cannot be {\tt NULL}. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% wxLogWindow %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\section{\class{wxLogWindow}}\label{wxlogwindow} + +This class represents a background log window: to be precise, it collects all +log messages in the log frame which it manages but also passes them on to the +log target which was active at the moment of its creation. This allows, for +example, to show all the log messages in a frame but still continue to process +them normally by showing the standard log dialog. + +\wxheading{Derived from} + +\helpref{wxLogPassThrough}{wxlogpassthrough} + +\wxheading{Include files} + + + +\wxheading{See also} + +\helpref{wxLogTextCtrl}{wxlogtextctrl} + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxLogWindow::wxLogWindow}\label{wxlogwindowctor} + +\func{}{wxLogWindow}{\param{wxFrame }{*parent}, \param{const wxChar }{*title}, \param{bool }{show = {\tt true}}, \param{bool }{passToOld = {\tt true}}} + +Creates the log frame window and starts collecting the messages in it. + +\wxheading{Parameters} + +\docparam{parent}{The parent window for the log frame, may be {\tt NULL}} + +\docparam{title}{The title for the log frame} + +\docparam{show}{{\tt true} to show the frame initially (default), otherwise +\helpref{wxLogWindow::Show}{wxlogwindowshow} must be called later.} + +\docparam{passToOld}{{\tt true} to process the log messages normally in addition to +logging them in the log frame (default), {\tt false} to only log them in the +log frame.} + +\membersection{wxLogWindow::Show}\label{wxlogwindowshow} + +\func{void}{Show}{\param{bool }{show = {\tt true}}} + +Shows or hides the frame. + +\membersection{wxLogWindow::GetFrame}\label{wxlogwindowgetframe} + +\constfunc{wxFrame *}{GetFrame}{\void} + +Returns the associated log frame window. This may be used to position or resize +it but use \helpref{wxLogWindow::Show}{wxlogwindowshow} to show or hide it. + +\membersection{wxLogWindow::OnFrameCreate}\label{wxlogwindowonframecreate} + +\func{virtual void}{OnFrameCreate}{\param{wxFrame }{*frame}} + +Called immediately after the log frame creation allowing for +any extra initializations. + +\membersection{wxLogWindow::OnFrameClose}\label{wxlogwindowonframeclose} + +\func{virtual bool}{OnFrameClose}{\param{wxFrame }{*frame}} + +Called if the user closes the window interactively, will not be +called if it is destroyed for another reason (such as when program +exits). + +Return {\tt true} from here to allow the frame to close, {\tt false} to +prevent this from happening. + +\wxheading{See also} + +\helpref{wxLogWindow::OnFrameDelete}{wxlogwindowonframedelete} + +\membersection{wxLogWindow::OnFrameDelete}\label{wxlogwindowonframedelete} + +\func{virtual void}{OnFrameDelete}{\param{wxFrame }{*frame}} + +Called right before the log frame is going to be deleted: will +always be called unlike \helpref{OnFrameClose()}{wxlogwindowonframeclose}. +