include/wx/log.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        log.h
   3 // Purpose:     Assorted wxLogXXX functions, and wxLog (sink for logs)
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     29/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef   _WX_LOG_H_
  13 #define   _WX_LOG_H_
  14
  15 #ifdef  __GNUG__
  16     #pragma interface "log.h"
  17 #endif
  18
  19 #include "wx/setup.h"
  20 #include "wx/string.h"
  21
  22 // ----------------------------------------------------------------------------
  23 // forward declarations
  24 // ----------------------------------------------------------------------------
  25
  26 class WXDLLEXPORT wxTextCtrl;
  27 class WXDLLEXPORT wxLogFrame;
  28 class WXDLLEXPORT wxFrame;
  29
  30 // ----------------------------------------------------------------------------
  31 // types
  32 // ----------------------------------------------------------------------------
  33
  34 typedef unsigned long wxTraceMask;
  35 typedef unsigned long wxLogLevel;
  36
  37 // ----------------------------------------------------------------------------
  38 // headers
  39 // ----------------------------------------------------------------------------
  40
  41 #if wxUSE_LOG
  42
  43 #include <time.h>   // for time_t
  44
  45 #include "wx/dynarray.h"
  46
  47 // ----------------------------------------------------------------------------
  48 // constants
  49 // ----------------------------------------------------------------------------
  50
  51 // different standard log levels (you may also define your own)
  52 enum
  53 {
  54     wxLOG_FatalError, // program can't continue, abort immediately
  55     wxLOG_Error,      // a serious error, user must be informed about it
  56     wxLOG_Warning,    // user is normally informed about it but may be ignored
  57     wxLOG_Message,    // normal message (i.e. normal output of a non GUI app)
  58     wxLOG_Info,       // informational message (a.k.a. 'Verbose')
  59     wxLOG_Status,     // informational: might go to the status line of GUI app
  60     wxLOG_Debug,      // never shown to the user, disabled in release mode
  61     wxLOG_Trace,      // trace messages are also only enabled in debug mode
  62     wxLOG_Progress,   // used for progress indicator (not yet)
  63     wxLOG_User = 100  // user defined levels start here
  64 };
  65
  66 // symbolic trace masks - wxLogTrace("foo", "some trace message...") will be
  67 // discarded unless the string "foo" has been added to the list of allowed
  68 // ones with AddTraceMask()
  69
  70 #define wxTRACE_MemAlloc wxT("memalloc") // trace memory allocation (new/delete)
  71 #define wxTRACE_Messages wxT("messages") // trace window messages/X callbacks
  72 #define wxTRACE_ResAlloc wxT("resalloc") // trace GDI resource allocation
  73 #define wxTRACE_RefCount wxT("refcount") // trace various ref counting operations
  74
  75 #ifdef  __WXMSW__
  76     #define wxTRACE_OleCalls wxT("ole")  // OLE interface calls
  77 #endif
  78
  79 // the trace masks have been superceded by symbolic trace constants, they're
  80 // for compatibility only andwill be removed soon - do NOT use them
  81
  82 // meaning of different bits of the trace mask (which allows selectively
  83 // enable/disable some trace messages)
  84 #define wxTraceMemAlloc 0x0001  // trace memory allocation (new/delete)
  85 #define wxTraceMessages 0x0002  // trace window messages/X callbacks
  86 #define wxTraceResAlloc 0x0004  // trace GDI resource allocation
  87 #define wxTraceRefCount 0x0008  // trace various ref counting operations
  88
  89 #ifdef  __WXMSW__
  90     #define wxTraceOleCalls 0x0100  // OLE interface calls
  91 #endif
  92
  93 #include "wx/ioswrap.h"
  94
  95 // ----------------------------------------------------------------------------
  96 // derive from this class to redirect (or suppress, or ...) log messages
  97 // normally, only a single instance of this class exists but it's not enforced
  98 // ----------------------------------------------------------------------------
  99
 100 class WXDLLEXPORT wxLog
 101 {
 102 public:
 103     // ctor
 104     wxLog();
 105
 106     // these functions allow to completely disable all log messages
 107         // is logging disabled now?
 108     static bool IsEnabled() { return ms_doLog; }
 109         // change the flag state, return the previous one
 110     static bool EnableLogging(bool doIt = TRUE)
 111         { bool doLogOld = ms_doLog; ms_doLog = doIt; return doLogOld; }
 112
 113     // static sink function - see DoLog() for function to overload in the
 114     // derived classes
 115     static void OnLog(wxLogLevel level, const wxChar *szString, time_t t)
 116     {
 117         if ( IsEnabled() ) {
 118             wxLog *pLogger = GetActiveTarget();
 119             if ( pLogger )
 120                 pLogger->DoLog(level, szString, t);
 121         }
 122     }
 123
 124     // message buffering
 125         // flush shows all messages if they're not logged immediately (FILE
 126         // and iostream logs don't need it, but wxGuiLog does to avoid showing
 127         // 17 modal dialogs one after another)
 128     virtual void Flush();
 129         // call to Flush() may be optimized: call it only if this function
 130         // returns true (although Flush() also returns immediately if there is
 131         // no messages, this functions is more efficient because inline)
 132     bool HasPendingMessages() const { return m_bHasMessages; }
 133
 134     // only one sink is active at each moment
 135         // flush the active target if any
 136     static void FlushActive()
 137     {
 138         if ( !ms_suspendCount )
 139         {
 140             wxLog *log = GetActiveTarget();
 141             if ( log && log->HasPendingMessages() )
 142                 log->Flush();
 143         }
 144     }
 145         // get current log target, will call wxApp::CreateLogTarget() to
 146         // create one if none exists
 147     static wxLog *GetActiveTarget();
 148         // change log target, pLogger may be NULL
 149     static wxLog *SetActiveTarget(wxLog *pLogger);
 150
 151         // suspend the message flushing of the main target until the next call
 152         // to Resume() - this is mainly for internal use (to prevent wxYield()
 153         // from flashing the messages)
 154     static void Suspend() { ms_suspendCount++; }
 155         // must be called for each Suspend()!
 156     static void Resume() { ms_suspendCount--; }
 157
 158     // functions controlling the default wxLog behaviour
 159         // verbose mode is activated by standard command-line '-verbose'
 160         // option
 161     void SetVerbose(bool bVerbose = TRUE) { m_bVerbose = bVerbose; }
 162         // should GetActiveTarget() try to create a new log object if the
 163         // current is NULL?
 164     static void DontCreateOnDemand();
 165
 166         // trace mask (see wxTraceXXX constants for details)
 167     static void SetTraceMask(wxTraceMask ulMask) { ms_ulTraceMask = ulMask; }
 168         // add string trace mask
 169     static void AddTraceMask(const wxString& str) { ms_aTraceMasks.Add(str); }
 170         // add string trace mask
 171     static void RemoveTraceMask(const wxString& str);
 172         // remove all string trace masks
 173     static void ClearTraceMasks();
 174
 175         // sets the timestamp string: this is used as strftime() format string
 176         // for the log targets which add time stamps to the messages - set it
 177         // to NULL to disable time stamping completely.
 178     static void SetTimestamp(const wxChar *ts) { ms_timestamp = ts; }
 179
 180     // accessors
 181         // gets the verbose status
 182     bool GetVerbose() const { return m_bVerbose; }
 183         // get trace mask
 184     static wxTraceMask GetTraceMask() { return ms_ulTraceMask; }
 185         // is this trace mask in the list?
 186     static bool IsAllowedTraceMask(const wxChar *mask)
 187         { return ms_aTraceMasks.Index(mask) != wxNOT_FOUND; }
 188
 189         // get the current timestamp format string (may be NULL)
 190     static const wxChar *GetTimestamp() { return ms_timestamp; }
 191
 192     // helpers
 193         // put the time stamp into the string if ms_timestamp != NULL (don't
 194         // change it otherwise)
 195     static void TimeStamp(wxString *str);
 196
 197     // make dtor virtual for all derived classes
 198     virtual ~wxLog() { }
 199
 200 protected:
 201     bool m_bHasMessages; // any messages in the queue?
 202     bool m_bVerbose;     // FALSE => ignore LogInfo messages
 203
 204     // the logging functions that can be overriden
 205         // default DoLog() prepends the time stamp and a prefix corresponding
 206         // to the message to szString and then passes it to DoLogString()
 207     virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t);
 208         // default DoLogString does nothing but is not pure virtual because if
 209         // you override DoLog() you might not need it at all
 210     virtual void DoLogString(const wxChar *szString, time_t t);
 211
 212 private:
 213     // static variables
 214     // ----------------
 215
 216     static wxLog      *ms_pLogger;      // currently active log sink
 217     static bool        ms_doLog;        // FALSE => all logging disabled
 218     static bool        ms_bAutoCreate;  // create new log targets on demand?
 219
 220     static size_t      ms_suspendCount; // if positive, logs are not flushed
 221
 222     // format string for strftime(), if NULL, time stamping log messages is
 223     // disabled
 224     static const wxChar *ms_timestamp;
 225
 226     static wxTraceMask ms_ulTraceMask;   // controls wxLogTrace behaviour
 227     static wxArrayString ms_aTraceMasks; // more powerful filter for wxLogTrace
 228 };
 229
 230 // ----------------------------------------------------------------------------
 231 // "trivial" derivations of wxLog
 232 // ----------------------------------------------------------------------------
 233
 234 // log everything to a "FILE *", stderr by default
 235 class WXDLLEXPORT wxLogStderr : public wxLog
 236 {
 237 public:
 238     // redirect log output to a FILE
 239     wxLogStderr(FILE *fp = (FILE *) NULL);
 240
 241 private:
 242     // implement sink function
 243     virtual void DoLogString(const wxChar *szString, time_t t);
 244
 245     FILE *m_fp;
 246 };
 247
 248 #if wxUSE_STD_IOSTREAM
 249 // log everything to an "ostream", cerr by default
 250 class WXDLLEXPORT wxLogStream : public wxLog
 251 {
 252 public:
 253     // redirect log output to an ostream
 254     wxLogStream(ostream *ostr = (ostream *) NULL);
 255
 256 protected:
 257     // implement sink function
 258     virtual void DoLogString(const wxChar *szString, time_t t);
 259
 260     // using ptr here to avoid including <iostream.h> from this file
 261     ostream *m_ostr;
 262 };
 263 #endif
 264
 265 // the following log targets are only compiled in if the we're compiling the
 266 // GUI part (andnot just the base one) of the library, they're implemented in
 267 // src/generic/logg.cpp *and not src/common/log.cpp unlike all the rest)
 268
 269 #if wxUSE_GUI
 270
 271 // log everything to a text window (GUI only of course)
 272 class WXDLLEXPORT wxLogTextCtrl : public wxLog
 273 {
 274 public:
 275     wxLogTextCtrl(wxTextCtrl *pTextCtrl);
 276
 277 private:
 278     // implement sink function
 279     virtual void DoLogString(const wxChar *szString, time_t t);
 280
 281     // the control we use
 282     wxTextCtrl *m_pTextCtrl;
 283 };
 284
 285 // ----------------------------------------------------------------------------
 286 // GUI log target, the default one for wxWindows programs
 287 // ----------------------------------------------------------------------------
 288 class WXDLLEXPORT wxLogGui : public wxLog
 289 {
 290 public:
 291     // ctor
 292     wxLogGui();
 293
 294     // show all messages that were logged since the last Flush()
 295     virtual void Flush();
 296
 297 protected:
 298     virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t);
 299
 300     // empty everything
 301     void Clear();
 302
 303     wxArrayString m_aMessages;      // the log message texts
 304     wxArrayInt    m_aSeverity;      // one of wxLOG_XXX values
 305     wxArrayLong   m_aTimes;         // the time of each message
 306     bool          m_bErrors,        // do we have any errors?
 307                   m_bWarnings;      // any warnings?
 308 };
 309
 310 // ----------------------------------------------------------------------------
 311 // (background) log window: this class forwards all log messages to the log
 312 // target which was active when it was instantiated, but also collects them
 313 // to the log window. This window has it's own menu which allows the user to
 314 // close it, clear the log contents or save it to the file.
 315 // ----------------------------------------------------------------------------
 316 class WXDLLEXPORT wxLogWindow : public wxLog
 317 {
 318 public:
 319     wxLogWindow(wxFrame *pParent,         // the parent frame (can be NULL)
 320             const wxChar *szTitle,      // the title of the frame
 321             bool bShow = TRUE,        // show window immediately?
 322             bool bPassToOld = TRUE);  // pass log messages to the old target?
 323     ~wxLogWindow();
 324
 325     // window operations
 326         // show/hide the log window
 327     void Show(bool bShow = TRUE);
 328         // retrieve the pointer to the frame
 329     wxFrame *GetFrame() const;
 330
 331     // accessors
 332         // the previous log target (may be NULL)
 333     wxLog *GetOldLog() const { return m_pOldLog; }
 334         // are we passing the messages to the previous log target?
 335     bool IsPassingMessages() const { return m_bPassMessages; }
 336
 337     // we can pass the messages to the previous log target (we're in this mode by
 338     // default: we collect all messages in the window, but also let the default
 339     // processing take place)
 340     void PassMessages(bool bDoPass) { m_bPassMessages = bDoPass; }
 341
 342     // base class virtuals
 343         // we don't need it ourselves, but we pass it to the previous logger
 344     virtual void Flush();
 345
 346     // overridables
 347         // called immediately after the log frame creation allowing for
 348         // any extra initializations
 349     virtual void OnFrameCreate(wxFrame *frame);
 350         // called if the user closes the window interactively, will not be
 351         // called if it is destroyed for another reason (such as when program
 352         // exits) - return TRUE from here to allow the frame to close, FALSE
 353         // to prevent this from happening
 354     virtual bool OnFrameClose(wxFrame *frame);
 355         // called right before the log frame is going to be deleted: will
 356         // always be called unlike OnFrameClose()
 357     virtual void OnFrameDelete(wxFrame *frame);
 358
 359 protected:
 360     virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t);
 361     virtual void DoLogString(const wxChar *szString, time_t t);
 362
 363 private:
 364     bool        m_bPassMessages;  // pass messages to m_pOldLog?
 365     wxLog      *m_pOldLog;        // previous log target
 366     wxLogFrame *m_pLogFrame;      // the log frame
 367 };
 368
 369 #endif // wxUSE_GUI
 370
 371 // ----------------------------------------------------------------------------
 372 // /dev/null log target: suppress logging until this object goes out of scope
 373 // ----------------------------------------------------------------------------
 374
 375 // example of usage:
 376 /*
 377    void Foo() {
 378    wxFile file;
 379
 380 // wxFile.Open() normally complains if file can't be opened, we don't want it
 381 wxLogNull logNo;
 382 if ( !file.Open("bar") )
 383 ... process error ourselves ...
 384
 385 // ~wxLogNull called, old log sink restored
 386 }
 387  */
 388 class WXDLLEXPORT wxLogNull
 389 {
 390 public:
 391     wxLogNull() { m_flagOld = wxLog::EnableLogging(FALSE); }
 392     ~wxLogNull() { (void)wxLog::EnableLogging(m_flagOld);   }
 393
 394 private:
 395     bool m_flagOld; // the previous value of the wxLog::ms_doLog
 396 };
 397
 398 // ============================================================================
 399 // global functions
 400 // ============================================================================
 401
 402 // ----------------------------------------------------------------------------
 403 // Log functions should be used by application instead of stdio, iostream &c
 404 // for log messages for easy redirection
 405 // ----------------------------------------------------------------------------
 406
 407 // are we in 'verbose' mode?
 408 // (note that it's often handy to change this var manually from the
 409 //  debugger, thus enabling/disabling verbose reporting for some
 410 //  parts of the program only)
 411 WXDLLEXPORT_DATA(extern bool) g_bVerbose;
 412
 413 // ----------------------------------------------------------------------------
 414 // get error code/error message from system in a portable way
 415 // ----------------------------------------------------------------------------
 416
 417 // return the last system error code
 418 WXDLLEXPORT unsigned long wxSysErrorCode();
 419 // return the error message for given (or last if 0) error code
 420 WXDLLEXPORT const wxChar* wxSysErrorMsg(unsigned long nErrCode = 0);
 421
 422 // define wxLog<level>
 423 // -------------------
 424
 425 #define DECLARE_LOG_FUNCTION(level)                                 \
 426 extern void WXDLLEXPORT wxLog##level(const wxChar *szFormat, ...)
 427 #define DECLARE_LOG_FUNCTION2(level, arg1)                          \
 428 extern void WXDLLEXPORT wxLog##level(arg1, const wxChar *szFormat, ...)
 429
 430 #else // !wxUSE_LOG
 431
 432 // log functions do nothing at all
 433 #define DECLARE_LOG_FUNCTION(level)                                 \
 434 inline void WXDLLEXPORT wxLog##level(const wxChar *szFormat, ...) {}
 435 #define DECLARE_LOG_FUNCTION2(level, arg1)                          \
 436 inline void WXDLLEXPORT wxLog##level(arg1, const wxChar *szFormat, ...) {}
 437
 438 #endif // wxUSE_LOG/!wxUSE_LOG
 439
 440 // a generic function for all levels (level is passes as parameter)
 441 DECLARE_LOG_FUNCTION2(Generic, wxLogLevel level);
 442
 443 // one function per each level
 444 DECLARE_LOG_FUNCTION(FatalError);
 445 DECLARE_LOG_FUNCTION(Error);
 446 DECLARE_LOG_FUNCTION(Warning);
 447 DECLARE_LOG_FUNCTION(Message);
 448 DECLARE_LOG_FUNCTION(Info);
 449 DECLARE_LOG_FUNCTION(Verbose);
 450
 451 // this function sends the log message to the status line of the top level
 452 // application frame, if any
 453 DECLARE_LOG_FUNCTION(Status);
 454
 455 // this one is the same as previous except that it allows to explicitly
 456 // specify the frame to which the output should go
 457 DECLARE_LOG_FUNCTION2(Status, wxFrame *pFrame);
 458
 459 // additional one: as wxLogError, but also logs last system call error code
 460 // and the corresponding error message if available
 461 DECLARE_LOG_FUNCTION(SysError);
 462
 463 // and another one which also takes the error code (for those broken APIs
 464 // that don't set the errno (like registry APIs in Win32))
 465 DECLARE_LOG_FUNCTION2(SysError, long lErrCode);
 466
 467 // debug functions do nothing in release mode
 468 #ifdef  __WXDEBUG__
 469     DECLARE_LOG_FUNCTION(Debug);
 470
 471     // first king of LogTrace is uncoditional: it doesn't check the level,
 472     DECLARE_LOG_FUNCTION(Trace);
 473
 474     // this second version will only log the message if the mask had been
 475     // added to the list of masks with AddTraceMask()
 476     DECLARE_LOG_FUNCTION2(Trace, const wxChar *mask);
 477
 478     // the last one does nothing if all of level bits are not set
 479     // in wxLog::GetActive()->GetTraceMask() - it's deprecated in favour of
 480     // string identifiers
 481     DECLARE_LOG_FUNCTION2(Trace, wxTraceMask mask);
 482 #else   //!debug
 483     // these functions do nothing in release builds
 484     inline void wxLogDebug(const wxChar *, ...) { }
 485     inline void wxLogTrace(const wxChar *, ...) { }
 486     inline void wxLogTrace(wxTraceMask, const wxChar *, ...) { }
 487     inline void wxLogTrace(const wxChar *, const wxChar *, ...) { }
 488 #endif // debug/!debug
 489
 490 // ----------------------------------------------------------------------------
 491 // debug only logging functions: use them with API name and error code
 492 // ----------------------------------------------------------------------------
 493
 494 #ifndef __TFILE__
 495     #define __XFILE__(x) Tx)
 496     #define __TFILE__ __XFILE__(__FILE__)
 497 #endif
 498
 499 #ifdef __WXDEBUG__
 500     // make life easier for people using VC++ IDE: clicking on the message
 501     // will take us immediately to the place of the failed API
 502 #ifdef __VISUALC__
 503     #define wxLogApiError(api, rc)                                            \
 504         wxLogDebug(wxT("%s(%d): '%s' failed with error 0x%08lx (%s)."),       \
 505                    __TFILE__, __LINE__, api,                              \
 506                    rc, wxSysErrorMsg(rc))
 507 #else // !VC++
 508     #define wxLogApiError(api, rc)                                            \
 509         wxLogDebug(wxT("In file %s at line %d: '%s' failed with "             \
 510                       "error 0x%08lx (%s)."),                                 \
 511                    __TFILE__, __LINE__, api,                              \
 512                    rc, wxSysErrorMsg(rc))
 513 #endif // VC++/!VC++
 514
 515     #define wxLogLastError(api) wxLogApiError(api, wxSysErrorCode())
 516
 517 #else   //!debug
 518     inline void wxLogApiError(const wxChar *, long) { }
 519     inline void wxLogLastError(const wxChar *) { }
 520 #endif  //debug/!debug
 521
 522 #endif  // _WX_LOG_H_