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wxLogGui Class Reference
Logging

`#include <wx/log.h>`

Inheritance diagram for wxLogGui:
[legend]

## Detailed Description

This is the default log target for the GUI wxWidgets applications.

Please see Logging Customization for explanation of how to change the default log target.

An object of this class is used by default to show the log messages created by using wxLogMessage(), wxLogError() and other logging functions. It doesn't display the messages logged by them immediately however but accumulates all messages logged during an event handler execution and then shows them all at once when its Flush() method is called during the idle time processing. This has the important advantage of showing only a single dialog to the user even if several messages were logged because of a single error as it often happens (e.g. a low level function could log a message because it failed to open a file resulting in its caller logging another message due to the failure of higher level operation requiring the use of this file). If you need to force the display of all previously logged messages immediately you can use wxLog::FlushActive() to force the dialog display.

Also notice that if an error message is logged when several informative messages had been already logged before, the informative messages are discarded on the assumption that they are not useful – and may be confusing and hence harmful – any more after the error. The warning and error messages are never discarded however and any informational messages logged after the first error one are also kept (as they may contain information about the error recovery). You may override DoLog() method to change this behaviour.

At any rate, it is possible that that several messages were accumulated before this class Flush() method is called. If this is the case, Flush() uses a custom dialog which shows the last message directly and allows the user to view the previously logged ones by expanding the "Details" wxCollapsiblePane inside it. This custom dialog also provides the buttons for copying the log messages to the clipboard and saving them to a file.

However if only a single message is present when Flush() is called, just a wxMessageBox() is used to show it. This has the advantage of being closer to the native behaviour but it doesn't give the user any possibility to copy or save the message (except for the recent Windows versions where `Ctrl-C` may be pressed in the message box to copy its contents to the clipboard) so you may want to override DoShowSingleLogMessage() to customize wxLogGui – the dialogs sample shows how to do this.

##

Library: wxCore
Category: Logging

## Public Member Functions
| wxLogGui ()
| Default constructor.
virtual void | Flush ()
| Presents the accumulated log messages, if any, to the user.
Public Member Functions inherited from wxLog
wxLogFormatter * | SetFormatter (wxLogFormatter *formatter)
| Sets the specified formatter as the active one.
void | LogRecord (wxLogLevel level, const wxString &msg, const wxLogRecordInfo &info)
| Log the given record.

## Protected Member Functions
wxString | GetTitle () const
| Returns the appropriate title for the dialog.
int | GetSeverityIcon () const
| Returns wxICON_ERROR, wxICON_WARNING or wxICON_INFORMATION depending on the current maximal severity.
void | Clear ()
| Forgets all the currently stored messages.
Protected Member Functions inherited from wxLog
virtual void | DoLogRecord (wxLogLevel level, const wxString &msg, const wxLogRecordInfo &info)
| Called to log a new record.
virtual void | DoLogTextAtLevel (wxLogLevel level, const wxString &msg)
| Called to log the specified string at given level.
virtual void | DoLogText (const wxString &msg)
| Called to log the specified string.

## Protected Attributes
wxArrayString | m_aMessages
| All currently accumulated messages.
wxArrayInt | m_aSeverity
| The severities of each logged message.
wxArrayLong | m_aTimes
| The time stamps of each logged message.
bool | m_bErrors
| True if there any error messages.
bool | m_bWarnings
| True if there any warning messages.
bool | m_bHasMessages
| True if there any messages to be shown to the user.

## Additional Inherited Members
Static Public Member Functions inherited from wxLog
static void | AddTraceMask (const wxString &mask)
| Add the mask to the list of allowed masks for wxLogTrace().
static void | ClearTraceMasks ()
| Removes all trace masks previously set with AddTraceMask().
static const wxArrayString & | GetTraceMasks ()
| Returns the currently allowed list of string trace masks.
static bool | IsAllowedTraceMask (const wxString &mask)
| Returns true if the mask is one of allowed masks for wxLogTrace().
static void | RemoveTraceMask (const wxString &mask)
| Remove the mask from the list of allowed masks for wxLogTrace().
static void | DontCreateOnDemand ()
| Instructs wxLog to not create new log targets on the fly if there is none currently (see GetActiveTarget()).
static wxLog * | GetActiveTarget ()
| Returns the pointer to the active log target (may be NULL).
static wxLog * | SetActiveTarget (wxLog *logtarget)
| Sets the specified log target as the active one.
static wxLog * | SetThreadActiveTarget (wxLog *logger)
| Sets a thread-specific log target.
static void | FlushActive ()
| Flushes the current log target if any, does nothing if there is none.
static void | Resume ()
| Resumes logging previously suspended by a call to Suspend().
static void | Suspend ()
| Suspends the logging until Resume() is called.
static wxLogLevel | GetLogLevel ()
| Returns the current log level limit.
static bool | IsLevelEnabled (wxLogLevel level, wxString component)
| Returns true if logging at this level is enabled for the current thread.
static void | SetComponentLevel (const wxString &component, wxLogLevel level)
| Sets the log level for the given component.
static void | SetLogLevel (wxLogLevel logLevel)
| Specifies that log messages with level greater (numerically) than logLevel should be ignored and not sent to the active log target.
static bool | EnableLogging (bool enable=true)
| Globally enable or disable logging.
static bool | IsEnabled ()
| Returns true if logging is enabled at all now.
static bool | GetRepetitionCounting ()
| Returns whether the repetition counting mode is enabled.
static void | SetRepetitionCounting (bool repetCounting=true)
| 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.
static const wxString & | GetTimestamp ()
| Returns the current timestamp format string.
static void | SetTimestamp (const wxString &format)
| Sets the timestamp format prepended by the default log targets to all messages.
static void | DisableTimestamp ()
| Disables time stamping of the log messages.
static bool | GetVerbose ()
| Returns whether the verbose mode is currently active.
static void | SetVerbose (bool verbose=true)
| Activates or deactivates verbose mode in which the verbose messages are logged as the normal ones instead of being silently dropped.

## Constructor & Destructor Documentation

wxLogGui::wxLogGui | ( |  | ) |

Default constructor.

## Member Function Documentation

void wxLogGui::Clear | ( |  | ) |
| protected

Forgets all the currently stored messages.

If you override Flush() (and don't call the base class version), you must call this method to avoid messages being logged over and over again.

virtual void wxLogGui::Flush | ( |  | ) |
| virtual

Presents the accumulated log messages, if any, to the user.

This method is called during the idle time and should show any messages accumulated in wxLogGui::m_aMessages field to the user.

Reimplemented from wxLog.

int wxLogGui::GetSeverityIcon | ( |  | ) | const
| protected

Returns wxICON_ERROR, wxICON_WARNING or wxICON_INFORMATION depending on the current maximal severity.

This value is suitable to be used in the style parameter of wxMessageBox() function.

wxString wxLogGui::GetTitle | ( |  | ) | const
| protected

Returns the appropriate title for the dialog.

The title is constructed from wxApp::GetAppDisplayName() and the severity string (e.g. "error" or "warning") appropriate for the current wxLogGui::m_bErrors and wxLogGui::m_bWarnings values.

## Member Data Documentation

wxArrayString wxLogGui::m_aMessages
| protected

All currently accumulated messages.

This array may be empty if no messages were logged.

See Also
  m_aSeverity, m_aTimes

wxArrayInt wxLogGui::m_aSeverity
| protected

The severities of each logged message.

This array is synchronized with wxLogGui::m_aMessages, i.e. the n-th element of this array corresponds to the severity of the n-th message. The possible severity values are `wxLOG_XXX` constants, e.g. wxLOG_Error, wxLOG_Warning, wxLOG_Message etc.

wxArrayLong wxLogGui::m_aTimes
| protected

The time stamps of each logged message.

The elements of this array are time_t values corresponding to the time when the message was logged.

bool wxLogGui::m_bErrors
| protected

True if there any error messages.

bool wxLogGui::m_bHasMessages
| protected

True if there any messages to be shown to the user.

This variable is used instead of simply checking whether wxLogGui::m_aMessages array is empty to allow blocking further calls to Flush() while a log dialog is already being shown, even if the messages array hasn't been emptied yet.

bool wxLogGui::m_bWarnings
| protected

True if there any warning messages.

If both wxLogGui::m_bErrors and this member are false, there are only informational messages to be shown.