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wxWidgets/include/wx/log.h
Vadim Zeitlin d7f19ee610 Fix spelling in comments and documentation using codespell 
Apply the utility from https://github.com/codespell-project/codespell/
to fix spelling issues in the headers under both include and interface
directories and add a file with a couple of exceptions.

The exact command line used was:

    $ codespell -w -I misc/scripts/codespell.ignore -i 3 in*
2020-06-27 22:56:22 +02:00

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/////////////////////////////////////////////////////////////////////////////
// Name: wx/log.h
// Purpose: Assorted wxLogXXX functions, and wxLog (sink for logs)
// Author: Vadim Zeitlin
// Modified by:
// Created: 29/01/98
// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_LOG_H_
#define _WX_LOG_H_
#include "wx/defs.h"
#include "wx/cpp.h"
// ----------------------------------------------------------------------------
// types
// ----------------------------------------------------------------------------
// NB: this is needed even if wxUSE_LOG == 0
typedef unsigned long wxLogLevel;
// the trace masks have been superseded by symbolic trace constants, they're
// for compatibility only and will be removed soon - do NOT use them
#if WXWIN_COMPATIBILITY_2_8
#define wxTraceMemAlloc 0x0001 // trace memory allocation (new/delete)
#define wxTraceMessages 0x0002 // trace window messages/X callbacks
#define wxTraceResAlloc 0x0004 // trace GDI resource allocation
#define wxTraceRefCount 0x0008 // trace various ref counting operations
#ifdef __WINDOWS__
#define wxTraceOleCalls 0x0100 // OLE interface calls
#endif
typedef unsigned long wxTraceMask;
#endif // WXWIN_COMPATIBILITY_2_8
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#include "wx/string.h"
#include "wx/strvararg.h"
// ----------------------------------------------------------------------------
// forward declarations
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_FWD_BASE wxObject;
#if wxUSE_GUI
class WXDLLIMPEXP_FWD_CORE wxFrame;
#endif // wxUSE_GUI
#if wxUSE_LOG
#include "wx/arrstr.h"
#include <time.h> // for time_t
#include "wx/dynarray.h"
#include "wx/hashmap.h"
#include "wx/msgout.h"
#if wxUSE_THREADS
#include "wx/thread.h"
#endif // wxUSE_THREADS
// wxUSE_LOG_DEBUG enables the debug log messages
#ifndef wxUSE_LOG_DEBUG
#if wxDEBUG_LEVEL
#define wxUSE_LOG_DEBUG 1
#else // !wxDEBUG_LEVEL
#define wxUSE_LOG_DEBUG 0
#endif
#endif
// wxUSE_LOG_TRACE enables the trace messages, they are disabled by default
#ifndef wxUSE_LOG_TRACE
#if wxDEBUG_LEVEL
#define wxUSE_LOG_TRACE 1
#else // !wxDEBUG_LEVEL
#define wxUSE_LOG_TRACE 0
#endif
#endif // wxUSE_LOG_TRACE
// wxLOG_COMPONENT identifies the component which generated the log record and
// can be #define'd to a user-defined value when compiling the user code to use
// component-based filtering (see wxLog::SetComponentLevel())
#ifndef wxLOG_COMPONENT
// this is a variable and not a macro in order to allow the user code to
// just #define wxLOG_COMPONENT without #undef'ining it first
extern WXDLLIMPEXP_DATA_BASE(const char *) wxLOG_COMPONENT;
#ifdef WXBUILDING
#define wxLOG_COMPONENT "wx"
#endif
#endif
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
// different standard log levels (you may also define your own)
enum wxLogLevelValues
{
wxLOG_FatalError, // program can't continue, abort immediately
wxLOG_Error, // a serious error, user must be informed about it
wxLOG_Warning, // user is normally informed about it but may be ignored
wxLOG_Message, // normal message (i.e. normal output of a non GUI app)
wxLOG_Status, // informational: might go to the status line of GUI app
wxLOG_Info, // informational message (a.k.a. 'Verbose')
wxLOG_Debug, // never shown to the user, disabled in release mode
wxLOG_Trace, // trace messages are also only enabled in debug mode
wxLOG_Progress, // used for progress indicator (not yet)
wxLOG_User = 100, // user defined levels start here
wxLOG_Max = 10000
};
// symbolic trace masks - wxLogTrace("foo", "some trace message...") will be
// discarded unless the string "foo" has been added to the list of allowed
// ones with AddTraceMask()
#define wxTRACE_MemAlloc wxT("memalloc") // trace memory allocation (new/delete)
#define wxTRACE_Messages wxT("messages") // trace window messages/X callbacks
#define wxTRACE_ResAlloc wxT("resalloc") // trace GDI resource allocation
#define wxTRACE_RefCount wxT("refcount") // trace various ref counting operations
#ifdef __WINDOWS__
#define wxTRACE_OleCalls wxT("ole") // OLE interface calls
#endif
#include "wx/iosfwrap.h"
// ----------------------------------------------------------------------------
// information about a log record, i.e. unit of log output
// ----------------------------------------------------------------------------
class wxLogRecordInfo
{
public:
// default ctor creates an uninitialized object
wxLogRecordInfo()
{
memset(this, 0, sizeof(*this));
}
// normal ctor, used by wxLogger specifies the location of the log
// statement; its time stamp and thread id are set up here
wxLogRecordInfo(const char *filename_,
int line_,
const char *func_,
const char *component_)
{
filename = filename_;
func = func_;
line = line_;
component = component_;
// don't initialize the timestamp yet, we might not need it at all if
// the message doesn't end up being logged and otherwise we'll fill it
// just before logging it, which won't change it by much and definitely
// less than a second resolution of the timestamp
timestamp = 0;
#if wxUSE_THREADS
threadId = wxThread::GetCurrentId();
#endif // wxUSE_THREADS
m_data = NULL;
}
// we need to define copy ctor and assignment operator because of m_data
wxLogRecordInfo(const wxLogRecordInfo& other)
{
Copy(other);
}
wxLogRecordInfo& operator=(const wxLogRecordInfo& other)
{
if ( &other != this )
{
delete m_data;
Copy(other);
}
return *this;
}
// dtor is non-virtual, this class is not meant to be derived from
~wxLogRecordInfo()
{
delete m_data;
}
// the file name and line number of the file where the log record was
// generated, if available or NULL and 0 otherwise
const char *filename;
int line;
// the name of the function where the log record was generated (may be NULL
// if the compiler doesn't support __FUNCTION__)
const char *func;
// the name of the component which generated this message, may be NULL if
// not set (i.e. wxLOG_COMPONENT not defined)
const char *component;
// time of record generation
time_t timestamp;
#if wxUSE_THREADS
// id of the thread which logged this record
wxThreadIdType threadId;
#endif // wxUSE_THREADS
// store an arbitrary value in this record context
//
// wxWidgets always uses keys starting with "wx.", e.g. "wx.sys_error"
void StoreValue(const wxString& key, wxUIntPtr val)
{
if ( !m_data )
m_data = new ExtraData;
m_data->numValues[key] = val;
}
void StoreValue(const wxString& key, const wxString& val)
{
if ( !m_data )
m_data = new ExtraData;
m_data->strValues[key] = val;
}
// these functions retrieve the value of either numeric or string key,
// return false if not found
bool GetNumValue(const wxString& key, wxUIntPtr *val) const
{
if ( !m_data )
return false;
const wxStringToNumHashMap::const_iterator it = m_data->numValues.find(key);
if ( it == m_data->numValues.end() )
return false;
*val = it->second;
return true;
}
bool GetStrValue(const wxString& key, wxString *val) const
{
if ( !m_data )
return false;
const wxStringToStringHashMap::const_iterator it = m_data->strValues.find(key);
if ( it == m_data->strValues.end() )
return false;
*val = it->second;
return true;
}
private:
void Copy(const wxLogRecordInfo& other)
{
memcpy(this, &other, sizeof(*this));
if ( other.m_data )
m_data = new ExtraData(*other.m_data);
}
// extra data associated with the log record: this is completely optional
// and can be used to pass information from the log function to the log
// sink (e.g. wxLogSysError() uses this to pass the error code)
struct ExtraData
{
wxStringToNumHashMap numValues;
wxStringToStringHashMap strValues;
};
// NULL if not used
ExtraData *m_data;
};
#define wxLOG_KEY_TRACE_MASK "wx.trace_mask"
// ----------------------------------------------------------------------------
// log record: a unit of log output
// ----------------------------------------------------------------------------
struct wxLogRecord
{
wxLogRecord(wxLogLevel level_,
const wxString& msg_,
const wxLogRecordInfo& info_)
: level(level_),
msg(msg_),
info(info_)
{
}
wxLogLevel level;
wxString msg;
wxLogRecordInfo info;
};
// ----------------------------------------------------------------------------
// Derive from this class to customize format of log messages.
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxLogFormatter
{
public:
// Default constructor.
wxLogFormatter() { }
// Trivial but virtual destructor for the base class.
virtual ~wxLogFormatter() { }
// Override this method to implement custom formatting of the given log
// record. The default implementation simply prepends a level-dependent
// prefix to the message and optionally adds a time stamp.
virtual wxString Format(wxLogLevel level,
const wxString& msg,
const wxLogRecordInfo& info) const;
protected:
// Override this method to change just the time stamp formatting. It is
// called by default Format() implementation.
virtual wxString FormatTime(time_t t) const;
};
// ----------------------------------------------------------------------------
// derive from this class to redirect (or suppress, or ...) log messages
// normally, only a single instance of this class exists but it's not enforced
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxLog
{
public:
// ctor
wxLog() : m_formatter(new wxLogFormatter) { }
// make dtor virtual for all derived classes
virtual ~wxLog();
// log messages selection
// ----------------------
// these functions allow to completely disable all log messages or disable
// log messages at level less important than specified for the current
// thread
// is logging enabled at all now?
static bool IsEnabled()
{
#if wxUSE_THREADS
if ( !wxThread::IsMain() )
return IsThreadLoggingEnabled();
#endif // wxUSE_THREADS
return ms_doLog;
}
// change the flag state, return the previous one
static bool EnableLogging(bool enable = true)
{
#if wxUSE_THREADS
if ( !wxThread::IsMain() )
return EnableThreadLogging(enable);
#endif // wxUSE_THREADS
const bool doLogOld = ms_doLog;
ms_doLog = enable;
return doLogOld;
}
// return the current global log level
static wxLogLevel GetLogLevel() { return ms_logLevel; }
// set global log level: messages with level > logLevel will not be logged
static void SetLogLevel(wxLogLevel logLevel) { ms_logLevel = logLevel; }
// set the log level for the given component
static void SetComponentLevel(const wxString& component, wxLogLevel level);
// return the effective log level for this component, falling back to
// parent component and to the default global log level if necessary
static wxLogLevel GetComponentLevel(const wxString& component);
// is logging of messages from this component enabled at this level?
//
// usually always called with wxLOG_COMPONENT as second argument
static bool IsLevelEnabled(wxLogLevel level, const wxString& component)
{
return IsEnabled() && level <= GetComponentLevel(component);
}
// enable/disable messages at wxLOG_Verbose level (only relevant if the
// current log level is greater or equal to it)
//
// notice that verbose mode can be activated by the standard command-line
// '--verbose' option
static void SetVerbose(bool bVerbose = true) { ms_bVerbose = bVerbose; }
// check if verbose messages are enabled
static bool GetVerbose() { return ms_bVerbose; }
// message buffering
// -----------------
// flush shows all messages if they're not logged immediately (FILE
// and iostream logs don't need it, but wxLogGui does to avoid showing
// 17 modal dialogs one after another)
virtual void Flush();
// flush the active target if any and also output any pending messages from
// background threads
static void FlushActive();
// only one sink is active at each moment get current log target, will call
// wxAppTraits::CreateLogTarget() to create one if none exists
static wxLog *GetActiveTarget();
// change log target, logger may be NULL
static wxLog *SetActiveTarget(wxLog *logger);
#if wxUSE_THREADS
// change log target for the current thread only, shouldn't be called from
// the main thread as it doesn't use thread-specific log target
static wxLog *SetThreadActiveTarget(wxLog *logger);
#endif // wxUSE_THREADS
// suspend the message flushing of the main target until the next call
// to Resume() - this is mainly for internal use (to prevent wxYield()
// from flashing the messages)
static void Suspend() { ms_suspendCount++; }
// must be called for each Suspend()!
static void Resume() { ms_suspendCount--; }
// should GetActiveTarget() try to create a new log object if the
// current is NULL?
static void DontCreateOnDemand();
// Make GetActiveTarget() create a new log object again.
static void DoCreateOnDemand();
// log the count of repeating messages instead of logging the messages
// multiple times
static void SetRepetitionCounting(bool bRepetCounting = true)
{ ms_bRepetCounting = bRepetCounting; }
// gets duplicate counting status
static bool GetRepetitionCounting() { return ms_bRepetCounting; }
// add string trace mask
static void AddTraceMask(const wxString& str);
// add string trace mask
static void RemoveTraceMask(const wxString& str);
// remove all string trace masks
static void ClearTraceMasks();
// get string trace masks: note that this is MT-unsafe if other threads can
// call AddTraceMask() concurrently
static const wxArrayString& GetTraceMasks();
// is this trace mask in the list?
static bool IsAllowedTraceMask(const wxString& mask);
// log formatting
// -----------------
// Change wxLogFormatter object used by wxLog to format the log messages.
//
// wxLog takes ownership of the pointer passed in but the caller is
// responsible for deleting the returned pointer.
wxLogFormatter* SetFormatter(wxLogFormatter* formatter);
// All the time stamp related functions below only work when the default
// wxLogFormatter is being used. Defining a custom formatter overrides them
// as it could use its own time stamp format or format messages without
// using time stamp at all.
// sets the time stamp string format: this is used as strftime() format
// string for the log targets which add time stamps to the messages; set
// it to empty string to disable time stamping completely.
static void SetTimestamp(const wxString& ts) { ms_timestamp = ts; }
// disable time stamping of log messages
static void DisableTimestamp() { SetTimestamp(wxEmptyString); }
// get the current timestamp format string (maybe empty)
static const wxString& GetTimestamp() { return ms_timestamp; }
// helpers: all functions in this section are mostly for internal use only,
// don't call them from your code even if they are not formally deprecated
// put the time stamp into the string if ms_timestamp is not empty (don't
// change it otherwise); the first overload uses the current time.
static void TimeStamp(wxString *str);
static void TimeStamp(wxString *str, time_t t);
// these methods should only be called from derived classes DoLogRecord(),
// DoLogTextAtLevel() and DoLogText() implementations respectively and
// shouldn't be called directly, use logging functions instead
void LogRecord(wxLogLevel level,
const wxString& msg,
const wxLogRecordInfo& info)
{
DoLogRecord(level, msg, info);
}
void LogTextAtLevel(wxLogLevel level, const wxString& msg)
{
DoLogTextAtLevel(level, msg);
}
void LogText(const wxString& msg)
{
DoLogText(msg);
}
// this is a helper used by wxLogXXX() functions, don't call it directly
// and see DoLog() for function to overload in the derived classes
static void OnLog(wxLogLevel level,
const wxString& msg,
const wxLogRecordInfo& info);
// version called when no information about the location of the log record
// generation is available (but the time stamp is), it mainly exists for
// backwards compatibility, don't use it in new code
static void OnLog(wxLogLevel level, const wxString& msg, time_t t);
// a helper calling the above overload with current time
static void OnLog(wxLogLevel level, const wxString& msg)
{
OnLog(level, msg, time(NULL));
}
// this method exists for backwards compatibility only, don't use
bool HasPendingMessages() const { return true; }
// don't use integer masks any more, use string trace masks instead
#if WXWIN_COMPATIBILITY_2_8
static wxDEPRECATED_INLINE( void SetTraceMask(wxTraceMask ulMask),
ms_ulTraceMask = ulMask; )
// this one can't be marked deprecated as it's used in our own wxLogger
// below but it still is deprecated and shouldn't be used
static wxTraceMask GetTraceMask() { return ms_ulTraceMask; }
#endif // WXWIN_COMPATIBILITY_2_8
protected:
// the logging functions that can be overridden: DoLogRecord() is called
// for every "record", i.e. a unit of log output, to be logged and by
// default formats the message and passes it to DoLogTextAtLevel() which in
// turn passes it to DoLogText() by default
// override this method if you want to change message formatting or do
// dynamic filtering
virtual void DoLogRecord(wxLogLevel level,
const wxString& msg,
const wxLogRecordInfo& info);
// override this method to redirect output to different channels depending
// on its level only; if even the level doesn't matter, override
// DoLogText() instead
virtual void DoLogTextAtLevel(wxLogLevel level, const wxString& msg);
// this function is not pure virtual as it might not be needed if you do
// the logging in overridden DoLogRecord() or DoLogTextAtLevel() directly
// but if you do not override them in your derived class you must override
// this one as the default implementation of it simply asserts
virtual void DoLogText(const wxString& msg);
// the rest of the functions are for backwards compatibility only, don't
// use them in new code; if you're updating your existing code you need to
// switch to overriding DoLogRecord/Text() above (although as long as these
// functions exist, log classes using them will continue to work)
#if WXWIN_COMPATIBILITY_2_8
wxDEPRECATED_BUT_USED_INTERNALLY(
virtual void DoLog(wxLogLevel level, const char *szString, time_t t)
);
wxDEPRECATED_BUT_USED_INTERNALLY(
virtual void DoLog(wxLogLevel level, const wchar_t *wzString, time_t t)
);
// these shouldn't be used by new code
wxDEPRECATED_BUT_USED_INTERNALLY_INLINE(
virtual void DoLogString(const char *WXUNUSED(szString),
time_t WXUNUSED(t)),
wxEMPTY_PARAMETER_VALUE
)
wxDEPRECATED_BUT_USED_INTERNALLY_INLINE(
virtual void DoLogString(const wchar_t *WXUNUSED(wzString),
time_t WXUNUSED(t)),
wxEMPTY_PARAMETER_VALUE
)
#endif // WXWIN_COMPATIBILITY_2_8
// log a message indicating the number of times the previous message was
// repeated if previous repetition counter is strictly positive, does
// nothing otherwise; return the old value of repetition counter
unsigned LogLastRepeatIfNeeded();
private:
#if wxUSE_THREADS
// called from FlushActive() to really log any buffered messages logged
// from the other threads
void FlushThreadMessages();
// these functions are called for non-main thread only by IsEnabled() and
// EnableLogging() respectively
static bool IsThreadLoggingEnabled();
static bool EnableThreadLogging(bool enable = true);
#endif // wxUSE_THREADS
// get the active log target for the main thread, auto-creating it if
// necessary
//
// this is called from GetActiveTarget() and OnLog() when they're called
// from the main thread
static wxLog *GetMainThreadActiveTarget();
// called from OnLog() if it's called from the main thread or if we have a
// (presumably MT-safe) thread-specific logger and by FlushThreadMessages()
// when it plays back the buffered messages logged from the other threads
void CallDoLogNow(wxLogLevel level,
const wxString& msg,
const wxLogRecordInfo& info);
// variables
// ----------------
wxLogFormatter *m_formatter; // We own this pointer.
// static variables
// ----------------
// if true, don't log the same message multiple times, only log it once
// with the number of times it was repeated
static bool ms_bRepetCounting;
static wxLog *ms_pLogger; // currently active log sink
static bool ms_doLog; // false => all logging disabled
static bool ms_bAutoCreate; // create new log targets on demand?
static bool ms_bVerbose; // false => ignore LogInfo messages
static wxLogLevel ms_logLevel; // limit logging to levels <= ms_logLevel
static size_t ms_suspendCount; // if positive, logs are not flushed
// format string for strftime(), if empty, time stamping log messages is
// disabled
static wxString ms_timestamp;
#if WXWIN_COMPATIBILITY_2_8
static wxTraceMask ms_ulTraceMask; // controls wxLogTrace behaviour
#endif // WXWIN_COMPATIBILITY_2_8
wxDECLARE_NO_COPY_CLASS(wxLog);
};
// ----------------------------------------------------------------------------
// "trivial" derivations of wxLog
// ----------------------------------------------------------------------------
// log everything except for the debug/trace messages (which are passed to
// wxMessageOutputDebug) to a buffer
class WXDLLIMPEXP_BASE wxLogBuffer : public wxLog
{
public:
wxLogBuffer() { }
// get the string contents with all messages logged
const wxString& GetBuffer() const { return m_str; }
// show the buffer contents to the user in the best possible way (this uses
// wxMessageOutputMessageBox) and clear it
virtual void Flush() wxOVERRIDE;
protected:
virtual void DoLogTextAtLevel(wxLogLevel level, const wxString& msg) wxOVERRIDE;
private:
wxString m_str;
wxDECLARE_NO_COPY_CLASS(wxLogBuffer);
};
// log everything to a "FILE *", stderr by default
class WXDLLIMPEXP_BASE wxLogStderr : public wxLog,
protected wxMessageOutputStderr
{
public:
// redirect log output to a FILE
wxLogStderr(FILE *fp = NULL,
const wxMBConv &conv = wxConvWhateverWorks);
protected:
// implement sink function
virtual void DoLogText(const wxString& msg) wxOVERRIDE;
wxDECLARE_NO_COPY_CLASS(wxLogStderr);
};
#if wxUSE_STD_IOSTREAM
// log everything to an "ostream", cerr by default
class WXDLLIMPEXP_BASE wxLogStream : public wxLog,
private wxMessageOutputWithConv
{
public:
// redirect log output to an ostream
wxLogStream(wxSTD ostream *ostr = (wxSTD ostream *) NULL,
const wxMBConv& conv = wxConvWhateverWorks);
protected:
// implement sink function
virtual void DoLogText(const wxString& msg) wxOVERRIDE;
// using ptr here to avoid including <iostream.h> from this file
wxSTD ostream *m_ostr;
wxDECLARE_NO_COPY_CLASS(wxLogStream);
};
#endif // wxUSE_STD_IOSTREAM
// ----------------------------------------------------------------------------
// /dev/null log target: suppress logging until this object goes out of scope
// ----------------------------------------------------------------------------
// example of usage:
/*
void Foo()
{
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
}
*/
class WXDLLIMPEXP_BASE wxLogNull
{
public:
wxLogNull() : m_flagOld(wxLog::EnableLogging(false)) { }
~wxLogNull() { (void)wxLog::EnableLogging(m_flagOld); }
private:
bool m_flagOld; // the previous value of the wxLog::ms_doLog
};
// ----------------------------------------------------------------------------
// chaining log target: installs itself as a log target and passes all
// messages to the real log target given to it in the ctor but also forwards
// them to the previously active one
//
// note that you don't have to call SetActiveTarget() with this class, it
// does it itself in its ctor
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxLogChain : public wxLog
{
public:
wxLogChain(wxLog *logger);
virtual ~wxLogChain();
// change the new log target
void SetLog(wxLog *logger);
// this can be used to temporarily disable (and then re-enable) passing
// messages to the old logger (by default we do pass them)
void PassMessages(bool bDoPass) { m_bPassMessages = bDoPass; }
// are we passing the messages to the previous log target?
bool IsPassingMessages() const { return m_bPassMessages; }
// return the previous log target (may be NULL)
wxLog *GetOldLog() const { return m_logOld; }
// override base class version to flush the old logger as well
virtual void Flush() wxOVERRIDE;
// call to avoid destroying the old log target
void DetachOldLog() { m_logOld = NULL; }
protected:
// pass the record to the old logger if needed
virtual void DoLogRecord(wxLogLevel level,
const wxString& msg,
const wxLogRecordInfo& info) wxOVERRIDE;
private:
// the current log target
wxLog *m_logNew;
// the previous log target
wxLog *m_logOld;
// do we pass the messages to the old logger?
bool m_bPassMessages;
wxDECLARE_NO_COPY_CLASS(wxLogChain);
};
// a chain log target which uses itself as the new logger
#define wxLogPassThrough wxLogInterposer
class WXDLLIMPEXP_BASE wxLogInterposer : public wxLogChain
{
public:
wxLogInterposer();
private:
wxDECLARE_NO_COPY_CLASS(wxLogInterposer);
};
// a temporary interposer which doesn't destroy the old log target
// (calls DetachOldLog)
class WXDLLIMPEXP_BASE wxLogInterposerTemp : public wxLogChain
{
public:
wxLogInterposerTemp();
private:
wxDECLARE_NO_COPY_CLASS(wxLogInterposerTemp);
};
#if wxUSE_GUI
// include GUI log targets:
#include "wx/generic/logg.h"
#endif // wxUSE_GUI
// ----------------------------------------------------------------------------
// wxLogger
// ----------------------------------------------------------------------------
// wxLogger is a helper class used by wxLogXXX() functions implementation,
// don't use it directly as it's experimental and subject to change (OTOH it
// might become public in the future if it's deemed to be useful enough)
// contains information about the context from which a log message originates
// and provides Log() vararg method which forwards to wxLog::OnLog() and passes
// this context to it
class wxLogger
{
public:
// ctor takes the basic information about the log record
wxLogger(wxLogLevel level,
const char *filename,
int line,
const char *func,
const char *component)
: m_level(level),
m_info(filename, line, func, component)
{
}
// store extra data in our log record and return this object itself (so
// that further calls to its functions could be chained)
template <typename T>
wxLogger& Store(const wxString& key, T val)
{
m_info.StoreValue(key, val);
return *this;
}
// hack for "overloaded" wxLogXXX() functions: calling this method
// indicates that we may have an extra first argument preceding the format
// string and that if we do have it, we should store it in m_info using the
// given key (while by default 0 value will be used)
wxLogger& MaybeStore(const wxString& key, wxUIntPtr value = 0)
{
wxASSERT_MSG( m_optKey.empty(), "can only have one optional value" );
m_optKey = key;
m_info.StoreValue(key, value);
return *this;
}
// non-vararg function used by wxVLogXXX():
// log the message at the level specified in the ctor if this log message
// is enabled
void LogV(const wxString& format, va_list argptr)
{
// remember that fatal errors can't be disabled
if ( m_level == wxLOG_FatalError ||
wxLog::IsLevelEnabled(m_level, m_info.component) )
DoCallOnLog(format, argptr);
}
// overloads used by functions with optional leading arguments (whose
// values are stored in the key passed to MaybeStore())
void LogV(long num, const wxString& format, va_list argptr)
{
Store(m_optKey, num);
LogV(format, argptr);
}
void LogV(void *ptr, const wxString& format, va_list argptr)
{
Store(m_optKey, wxPtrToUInt(ptr));
LogV(format, argptr);
}
void LogVTrace(const wxString& mask, const wxString& format, va_list argptr)
{
if ( !wxLog::IsAllowedTraceMask(mask) )
return;
Store(wxLOG_KEY_TRACE_MASK, mask);
LogV(format, argptr);
}
// vararg functions used by wxLogXXX():
// will log the message at the level specified in the ctor
//
// notice that this function supposes that the caller already checked that
// the level was enabled and does no checks itself
WX_DEFINE_VARARG_FUNC_VOID
(
Log,
1, (const wxFormatString&),
DoLog, DoLogUtf8
)
// same as Log() but with an extra numeric or pointer parameters: this is
// used to pass an optional value by storing it in m_info under the name
// passed to MaybeStore() and is required to support "overloaded" versions
// of wxLogStatus() and wxLogSysError()
WX_DEFINE_VARARG_FUNC_VOID
(
Log,
2, (long, const wxFormatString&),
DoLogWithNum, DoLogWithNumUtf8
)
// unfortunately we can't use "void *" here as we get overload ambiguities
// with Log(wxFormatString, ...) when the first argument is a "char *" or
// "wchar_t *" then -- so we only allow passing wxObject here, which is
// ugly but fine in practice as this overload is only used by wxLogStatus()
// whose first argument is a wxFrame
WX_DEFINE_VARARG_FUNC_VOID
(
Log,
2, (wxObject *, const wxFormatString&),
DoLogWithPtr, DoLogWithPtrUtf8
)
// log the message at the level specified as its first argument
//
// as the macros don't have access to the level argument in this case, this
// function does check that the level is enabled itself
WX_DEFINE_VARARG_FUNC_VOID
(
LogAtLevel,
2, (wxLogLevel, const wxFormatString&),
DoLogAtLevel, DoLogAtLevelUtf8
)
// special versions for wxLogTrace() which is passed either string or
// integer mask as first argument determining whether the message should be
// logged or not
WX_DEFINE_VARARG_FUNC_VOID
(
LogTrace,
2, (const wxString&, const wxFormatString&),
DoLogTrace, DoLogTraceUtf8
)
#if WXWIN_COMPATIBILITY_2_8
WX_DEFINE_VARARG_FUNC_VOID
(
LogTrace,
2, (wxTraceMask, const wxFormatString&),
DoLogTraceMask, DoLogTraceMaskUtf8
)
#endif // WXWIN_COMPATIBILITY_2_8
private:
#if !wxUSE_UTF8_LOCALE_ONLY
void DoLog(const wxChar *format, ...)
{
va_list argptr;
va_start(argptr, format);
DoCallOnLog(format, argptr);
va_end(argptr);
}
void DoLogWithNum(long num, const wxChar *format, ...)
{
Store(m_optKey, num);
va_list argptr;
va_start(argptr, format);
DoCallOnLog(format, argptr);
va_end(argptr);
}
void DoLogWithPtr(void *ptr, const wxChar *format, ...)
{
Store(m_optKey, wxPtrToUInt(ptr));
va_list argptr;
va_start(argptr, format);
DoCallOnLog(format, argptr);
va_end(argptr);
}
void DoLogAtLevel(wxLogLevel level, const wxChar *format, ...)
{
if ( !wxLog::IsLevelEnabled(level, m_info.component) )
return;
va_list argptr;
va_start(argptr, format);
DoCallOnLog(level, format, argptr);
va_end(argptr);
}
void DoLogTrace(const wxString& mask, const wxChar *format, ...)
{
if ( !wxLog::IsAllowedTraceMask(mask) )
return;
Store(wxLOG_KEY_TRACE_MASK, mask);
va_list argptr;
va_start(argptr, format);
DoCallOnLog(format, argptr);
va_end(argptr);
}
#if WXWIN_COMPATIBILITY_2_8
void DoLogTraceMask(wxTraceMask mask, const wxChar *format, ...)
{
if ( (wxLog::GetTraceMask() & mask) != mask )
return;
Store(wxLOG_KEY_TRACE_MASK, mask);
va_list argptr;
va_start(argptr, format);
DoCallOnLog(format, argptr);
va_end(argptr);
}
#endif // WXWIN_COMPATIBILITY_2_8
#endif // !wxUSE_UTF8_LOCALE_ONLY
#if wxUSE_UNICODE_UTF8
void DoLogUtf8(const char *format, ...)
{
va_list argptr;
va_start(argptr, format);
DoCallOnLog(format, argptr);
va_end(argptr);
}
void DoLogWithNumUtf8(long num, const char *format, ...)
{
Store(m_optKey, num);
va_list argptr;
va_start(argptr, format);
DoCallOnLog(format, argptr);
va_end(argptr);
}
void DoLogWithPtrUtf8(void *ptr, const char *format, ...)
{
Store(m_optKey, wxPtrToUInt(ptr));
va_list argptr;
va_start(argptr, format);
DoCallOnLog(format, argptr);
va_end(argptr);
}
void DoLogAtLevelUtf8(wxLogLevel level, const char *format, ...)
{
if ( !wxLog::IsLevelEnabled(level, m_info.component) )
return;
va_list argptr;
va_start(argptr, format);
DoCallOnLog(level, format, argptr);
va_end(argptr);
}
void DoLogTraceUtf8(const wxString& mask, const char *format, ...)
{
if ( !wxLog::IsAllowedTraceMask(mask) )
return;
Store(wxLOG_KEY_TRACE_MASK, mask);
va_list argptr;
va_start(argptr, format);
DoCallOnLog(format, argptr);
va_end(argptr);
}
#if WXWIN_COMPATIBILITY_2_8
void DoLogTraceMaskUtf8(wxTraceMask mask, const char *format, ...)
{
if ( (wxLog::GetTraceMask() & mask) != mask )
return;
Store(wxLOG_KEY_TRACE_MASK, mask);
va_list argptr;
va_start(argptr, format);
DoCallOnLog(format, argptr);
va_end(argptr);
}
#endif // WXWIN_COMPATIBILITY_2_8
#endif // wxUSE_UNICODE_UTF8
void DoCallOnLog(wxLogLevel level, const wxString& format, va_list argptr)
{
// As explained in wxLogRecordInfo ctor, we don't initialize its
// timestamp to avoid calling time() unnecessary, but now that we are
// about to log the message, we do need to do it.
m_info.timestamp = time(NULL);
wxLog::OnLog(level, wxString::FormatV(format, argptr), m_info);
}
void DoCallOnLog(const wxString& format, va_list argptr)
{
DoCallOnLog(m_level, format, argptr);
}
const wxLogLevel m_level;
wxLogRecordInfo m_info;
wxString m_optKey;
wxDECLARE_NO_COPY_CLASS(wxLogger);
};
// ============================================================================
// global functions
// ============================================================================
// ----------------------------------------------------------------------------
// get error code/error message from system in a portable way
// ----------------------------------------------------------------------------
// return the last system error code
WXDLLIMPEXP_BASE unsigned long wxSysErrorCode();
// return the error message for given (or last if 0) error code
WXDLLIMPEXP_BASE const wxChar* wxSysErrorMsg(unsigned long nErrCode = 0);
// return the error message for given (or last if 0) error code
WXDLLIMPEXP_BASE wxString wxSysErrorMsgStr(unsigned long nErrCode = 0);
// ----------------------------------------------------------------------------
// define wxLog<level>() functions which can be used by application instead of
// stdio, iostream &c for log messages for easy redirection
// ----------------------------------------------------------------------------
/*
The code below is unreadable because it (unfortunately unavoidably)
contains a lot of macro magic but all it does is to define wxLogXXX() such
that you can call them as vararg functions to log a message at the
corresponding level.
More precisely, it defines:
- wxLog{FatalError,Error,Warning,Message,Verbose,Debug}() functions
taking the format string and additional vararg arguments if needed.
- wxLogGeneric(wxLogLevel level, const wxString& format, ...) which
takes the log level explicitly.
- wxLogSysError(const wxString& format, ...) and wxLogSysError(long
err, const wxString& format, ...) which log a wxLOG_Error severity
message with the error message corresponding to the system error code
err or the last error.
- wxLogStatus(const wxString& format, ...) which logs the message into
the status bar of the main application window and its overload
wxLogStatus(wxFrame *frame, const wxString& format, ...) which logs it
into the status bar of the specified frame.
- wxLogTrace(Mask mask, const wxString& format, ...) which only logs
the message is the specified mask is enabled. This comes in two kinds:
Mask can be a wxString or a long. Both are deprecated.
In addition, wxVLogXXX() versions of all the functions above are also
defined. They take a va_list argument instead of "...".
*/
// creates wxLogger object for the current location
#define wxMAKE_LOGGER(level) \
wxLogger(wxLOG_##level, __FILE__, __LINE__, __WXFUNCTION__, wxLOG_COMPONENT)
// this macro generates the expression which logs whatever follows it in
// parentheses at the level specified as argument
#define wxDO_LOG(level) wxDO_LOG_WITH_FUNC(level, Log)
// generalization of the macro above that uses the given function of wxLogger
// object rather than the default "Log"
#define wxDO_LOG_WITH_FUNC(level, func) wxMAKE_LOGGER(level).func
// this is the non-vararg equivalent
#define wxDO_LOGV(level, format, argptr) \
wxMAKE_LOGGER(level).LogV(format, argptr)
// Macro evaluating to true if logging at the given level is enabled.
#define wxLOG_IS_ENABLED(level) \
wxLog::IsLevelEnabled(wxLOG_##level, wxLOG_COMPONENT)
// Macro used to define most of the actual wxLogXXX() macros: just calls
// wxLogger::Log(), if logging at the specified level is enabled.
#define wxDO_LOG_IF_ENABLED(level) \
wxDO_IF(wxLOG_IS_ENABLED(level)) \
wxDO_LOG(level)
// Similar to above, but calls the given function instead of Log().
#define wxDO_LOG_IF_ENABLED_WITH_FUNC(level, func) \
wxDO_IF(wxLOG_IS_ENABLED(level)) \
wxDO_LOG_WITH_FUNC(level, func)
// wxLogFatalError() is special as it can't be disabled
#define wxLogFatalError wxDO_LOG(FatalError)
#define wxVLogFatalError(format, argptr) wxDO_LOGV(FatalError, format, argptr)
#define wxLogError wxDO_LOG_IF_ENABLED(Error)
#define wxVLogError(format, argptr) wxDO_LOGV(Error, format, argptr)
#define wxLogWarning wxDO_LOG_IF_ENABLED(Warning)
#define wxVLogWarning(format, argptr) wxDO_LOGV(Warning, format, argptr)
#define wxLogMessage wxDO_LOG_IF_ENABLED(Message)
#define wxVLogMessage(format, argptr) wxDO_LOGV(Message, format, argptr)
#define wxLogInfo wxDO_LOG_IF_ENABLED(Info)
#define wxVLogInfo(format, argptr) wxDO_LOGV(Info, format, argptr)
// this one is special as it only logs if we're in verbose mode
#define wxLogVerbose \
wxDO_IF(wxLOG_IS_ENABLED(Info) && wxLog::GetVerbose()) \
wxDO_LOG(Info)
#define wxVLogVerbose(format, argptr) \
wxDO_IF(wxLOG_IS_ENABLED(Info) && wxLog::GetVerbose()) \
wxDO_LOGV(Info, format, argptr)
// another special case: the level is passed as first argument of the function
// and so is not available to the macro
//
// notice that because of this, arguments of wxLogGeneric() are currently
// always evaluated, unlike for the other log functions
#define wxLogGeneric wxMAKE_LOGGER(Max).LogAtLevel
#define wxVLogGeneric(level, format, argptr) \
wxDO_IF(wxLOG_IS_ENABLED(level)) \
wxDO_LOGV(level, format, argptr)
// wxLogSysError() needs to stash the error code value in the log record info
// so it needs special handling too; additional complications arise because the
// error code may or not be present as the first argument
//
// notice that we unfortunately can't avoid the call to wxSysErrorCode() even
// though it may be unneeded if an explicit error code is passed to us because
// the message might not be logged immediately (e.g. it could be queued for
// logging from the main thread later) and so we can't to wait until it is
// logged to determine whether we have last error or not as it will be too late
// and it will have changed already by then (in fact it even changes when
// wxString::Format() is called because of vsnprintf() inside it so it can
// change even much sooner)
#define wxLOG_KEY_SYS_ERROR_CODE "wx.sys_error"
#define wxLogSysError \
wxDO_LOG_IF_ENABLED_WITH_FUNC(Error, MaybeStore(wxLOG_KEY_SYS_ERROR_CODE, \
wxSysErrorCode()).Log)
// unfortunately we can't have overloaded macros so we can't define versions
// both with and without error code argument and have to rely on LogV()
// overloads in wxLogger to select between them
#define wxVLogSysError \
wxMAKE_LOGGER(Error).MaybeStore(wxLOG_KEY_SYS_ERROR_CODE, \
wxSysErrorCode()).LogV
#if wxUSE_GUI
// wxLogStatus() is similar to wxLogSysError() as it allows to optionally
// specify the frame to which the message should go
#define wxLOG_KEY_FRAME "wx.frame"
#define wxLogStatus \
wxDO_LOG_IF_ENABLED_WITH_FUNC(Status, MaybeStore(wxLOG_KEY_FRAME).Log)
#define wxVLogStatus \
wxMAKE_LOGGER(Status).MaybeStore(wxLOG_KEY_FRAME).LogV
#endif // wxUSE_GUI
#else // !wxUSE_LOG
#undef wxUSE_LOG_DEBUG
#define wxUSE_LOG_DEBUG 0
#undef wxUSE_LOG_TRACE
#define wxUSE_LOG_TRACE 0
// define macros for defining log functions which do nothing at all
#define wxDEFINE_EMPTY_LOG_FUNCTION(level) \
WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 1, (const wxFormatString&)) \
inline void wxVLog##level(const wxFormatString& WXUNUSED(format), \
va_list WXUNUSED(argptr)) { } \
#define wxDEFINE_EMPTY_LOG_FUNCTION2(level, argclass) \
WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 2, (argclass, const wxFormatString&)) \
inline void wxVLog##level(argclass WXUNUSED(arg), \
const wxFormatString& WXUNUSED(format), \
va_list WXUNUSED(argptr)) {}
wxDEFINE_EMPTY_LOG_FUNCTION(FatalError);
wxDEFINE_EMPTY_LOG_FUNCTION(Error);
wxDEFINE_EMPTY_LOG_FUNCTION(SysError);
wxDEFINE_EMPTY_LOG_FUNCTION2(SysError, long);
wxDEFINE_EMPTY_LOG_FUNCTION(Warning);
wxDEFINE_EMPTY_LOG_FUNCTION(Message);
wxDEFINE_EMPTY_LOG_FUNCTION(Info);
wxDEFINE_EMPTY_LOG_FUNCTION(Verbose);
wxDEFINE_EMPTY_LOG_FUNCTION2(Generic, wxLogLevel);
#if wxUSE_GUI
wxDEFINE_EMPTY_LOG_FUNCTION(Status);
wxDEFINE_EMPTY_LOG_FUNCTION2(Status, wxFrame *);
#endif // wxUSE_GUI
// Empty Class to fake wxLogNull
class WXDLLIMPEXP_BASE wxLogNull
{
public:
wxLogNull() { }
};
// Dummy macros to replace some functions.
#define wxSysErrorCode() (unsigned long)0
#define wxSysErrorMsg( X ) (const wxChar*)NULL
#define wxSysErrorMsgStr( X ) wxEmptyString
// Fake symbolic trace masks... for those that are used frequently
#define wxTRACE_OleCalls wxEmptyString // OLE interface calls
#endif // wxUSE_LOG/!wxUSE_LOG
// debug functions can be completely disabled in optimized builds
// if these log functions are disabled, we prefer to define them as (empty)
// variadic macros as this completely removes them and their argument
// evaluation from the object code but if this is not supported by compiler we
// use empty inline functions instead (defining them as nothing would result in
// compiler warnings)
//
// note that making wxVLogDebug/Trace() themselves (empty inline) functions is
// a bad idea as some compilers are stupid enough to not inline even empty
// functions if their parameters are complicated enough, but by defining them
// as an empty inline function we ensure that even dumbest compilers optimise
// them away
#ifdef __BORLANDC__
// but Borland gives "W8019: Code has no effect" for wxLogNop() so we need
// to define it differently for it to avoid these warnings (same problem as
// with wxUnusedVar())
#define wxLogNop() { }
#else
inline void wxLogNop() { }
#endif
#if wxUSE_LOG_DEBUG
#define wxLogDebug wxDO_LOG_IF_ENABLED(Debug)
#define wxVLogDebug(format, argptr) wxDO_LOGV(Debug, format, argptr)
#else // !wxUSE_LOG_DEBUG
#define wxVLogDebug(fmt, valist) wxLogNop()
#ifdef HAVE_VARIADIC_MACROS
#define wxLogDebug(fmt, ...) wxLogNop()
#else // !HAVE_VARIADIC_MACROS
WX_DEFINE_VARARG_FUNC_NOP(wxLogDebug, 1, (const wxFormatString&))
#endif
#endif // wxUSE_LOG_DEBUG/!wxUSE_LOG_DEBUG
#if wxUSE_LOG_TRACE
#define wxLogTrace wxDO_LOG_IF_ENABLED_WITH_FUNC(Trace, LogTrace)
#define wxVLogTrace wxDO_LOG_IF_ENABLED_WITH_FUNC(Trace, LogVTrace)
#else // !wxUSE_LOG_TRACE
#define wxVLogTrace(mask, fmt, valist) wxLogNop()
#ifdef HAVE_VARIADIC_MACROS
#define wxLogTrace(mask, fmt, ...) wxLogNop()
#else // !HAVE_VARIADIC_MACROS
#if WXWIN_COMPATIBILITY_2_8
WX_DEFINE_VARARG_FUNC_NOP(wxLogTrace, 2, (wxTraceMask, const wxFormatString&))
#endif
WX_DEFINE_VARARG_FUNC_NOP(wxLogTrace, 2, (const wxString&, const wxFormatString&))
#endif // HAVE_VARIADIC_MACROS/!HAVE_VARIADIC_MACROS
#endif // wxUSE_LOG_TRACE/!wxUSE_LOG_TRACE
// wxLogFatalError helper: show the (fatal) error to the user in a safe way,
// i.e. without using wxMessageBox() for example because it could crash
void WXDLLIMPEXP_BASE
wxSafeShowMessage(const wxString& title, const wxString& text);
// ----------------------------------------------------------------------------
// debug only logging functions: use them with API name and error code
// ----------------------------------------------------------------------------
#if wxUSE_LOG_DEBUG
// make life easier for people using VC++ IDE: clicking on the message
// will take us immediately to the place of the failed API
#ifdef __VISUALC__
#define wxLogApiError(api, rc) \
wxLogDebug(wxT("%s(%d): '%s' failed with error 0x%08lx (%s)."), \
__FILE__, __LINE__, api, \
(long)rc, wxSysErrorMsgStr(rc))
#else // !VC++
#define wxLogApiError(api, rc) \
wxLogDebug(wxT("In file %s at line %d: '%s' failed with ") \
wxT("error 0x%08lx (%s)."), \
__FILE__, __LINE__, api, \
(long)rc, wxSysErrorMsgStr(rc))
#endif // VC++/!VC++
#define wxLogLastError(api) wxLogApiError(api, wxSysErrorCode())
#else // !wxUSE_LOG_DEBUG
#define wxLogApiError(api, err) wxLogNop()
#define wxLogLastError(api) wxLogNop()
#endif // wxUSE_LOG_DEBUG/!wxUSE_LOG_DEBUG
// macro which disables debug logging in release builds: this is done by
// default by wxIMPLEMENT_APP() so usually it doesn't need to be used explicitly
#if defined(NDEBUG) && wxUSE_LOG_DEBUG
#define wxDISABLE_DEBUG_LOGGING_IN_RELEASE_BUILD() \
wxLog::SetLogLevel(wxLOG_Info)
#else // !NDEBUG
#define wxDISABLE_DEBUG_LOGGING_IN_RELEASE_BUILD()
#endif // NDEBUG/!NDEBUG
#endif // _WX_LOG_H_
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