\section{Log classes overview}\label{wxlogoverview}
-Classes: \helpref{wxLog}{wxlog}, \helpref{wxLogStderr}{wxlogstderr},
- \helpref{wxLogOstream}{wxlogostream}, \helpref{wxLogTextCtrl}{wxlogtextctrl},
- \helpref{wxLogWindow}{wxlogwindow}, \helpref{wxLogGui}{wxloggui},
- \helpref{wxLogNull}{wxlognull}
+Classes: \helpref{wxLog}{wxlog}, wxLogStderr,
+wxLogOstream, wxLogTextCtrl, wxLogWindow, wxLogGui, wxLogNull
This is a general overview of logging classes provided by wxWindows. The word
logging here has a broad sense, including all of the program output, not only
\item{\bf wxLogVerbose} is for verbose output. Normally, it's suppressed, but
might be activated if the user wishes to know more details about the program
progress (another, but possibly confusing name for the same function is {\bf
-wxLogInfo}
+wxLogInfo}).
\item{\bf wxLogStatus} is for status messages - they will go into the status
bar of the active or specified (as the first argument) \helpref{wxFrame}{wxframe} if it has one.
\item{\bf wxLogSysError} is mostly used by wxWindows itself, but might be
handy for logging errors after system call (API function) failure. It logs the
-specified message text as well as the last system error code ({\it errno} or
-{\it ::GetLastError()} depending on the platform) and the corresponding error
+specified message text as well as the last system error
+code ({\it errno} or {\it ::GetLastError()} depending on the platform) and the corresponding error
message. The second form of this function takes the error code explitly as the
first argument.
\item{\bf wxLogDebug} is {\bf the} right function for debug output. It only
to further restrict the amount of messages generated.
\end{itemize}
-% VZ: Julian, am I pushing too much here?
The usage of these functions should be fairly straightforward, however it may
be asked why not use the other logging facilities, such as C standard stdio
functions or C++ streams. The short answer is that they're all very good
\begin{itemize}\itemsep=0pt
\item{\bf Portability} It's a common practice to use {\it printf()} statements or
cout/cerr C++ streams for writing out some (debug or otherwise) information.
-Although it works just fine under Unix, these messages go strictly nowever
+Although it works just fine under Unix, these messages go strictly nowhere
under Windows where the stdout of GUI programs is not assigned to anything.
Thus, you might view {\it wxLogMessage()} as a simple substitute for {\it
printf()}.
\item{\bf wxLogNull} The last log class is quite particular: it doesn't do
anything. The objects of this class may be instantiated to (temporarily)
suppress output of {\it wxLogXXX()} functions. As an example, trying to open a
-non-existing file will usually provoke an error message, but if you for some
-reason it's unwanted, just use this construction:
+non-existing file will usually provoke an error message, but if for some
+reasons it's unwanted, just use this construction:
{\small
\begin{verbatim}