corrected misleading comment about DllGetVersion()

[wxWidgets.git] / src / common / appbase.cpp

///////////////////////////////////////////////////////////////////////////////
// Name:        common/base/appbase.cpp
// Purpose:     implements wxAppConsole class
// Author:      Vadim Zeitlin
// Modified by:
// Created:     19.06.2003 (extracted from common/appcmn.cpp)
// RCS-ID:      $Id$
// Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
// License:     wxWindows license
///////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

// for compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#ifndef WX_PRECOMP
    #include "wx/app.h"
    #include "wx/intl.h"
    #include "wx/list.h"
    #include "wx/log.h"
#endif //WX_PRECOMP

#include "wx/utils.h"
#include "wx/apptrait.h"
#include "wx/cmdline.h"
#include "wx/confbase.h"
#include "wx/filename.h"
#include "wx/msgout.h"
#include "wx/tokenzr.h"

#if !defined(__WXMSW__) || defined(__WXMICROWIN__)
  #include  <signal.h>      // for SIGTRAP used by wxTrap()
#endif  //Win/Unix

#if defined(__WXMSW__)
  #include  "wx/msw/wrapwin.h"  // includes windows.h for MessageBox()
#endif

#if wxUSE_FONTMAP
    #include "wx/fontmap.h"
#endif // wxUSE_FONTMAP

#if defined(__DARWIN__) && defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
    // For MacTypes.h for Debugger function
    #include <CoreFoundation/CFBase.h>
#endif

#if defined(__WXMAC__)
    #ifdef __DARWIN__
        #include  <CoreServices/CoreServices.h>
    #else
        #include  "wx/mac/private.h"  // includes mac headers
    #endif
#endif // __WXMAC__

#ifdef __WXDEBUG__
    #if wxUSE_STACKWALKER
        #include "wx/stackwalk.h"
        #ifdef __WXMSW__
            #include "wx/msw/debughlp.h"
        #endif
    #endif // wxUSE_STACKWALKER
#endif // __WXDEBUG__

// wxABI_VERSION can be defined when compiling applications but it should be
// left undefined when compiling the library itself, it is then set to its
// default value in version.h
#if wxABI_VERSION != wxMAJOR_VERSION * 10000 + wxMINOR_VERSION * 100 + 99
#error "wxABI_VERSION should not be defined when compiling the library"
#endif

// ----------------------------------------------------------------------------
// private functions prototypes
// ----------------------------------------------------------------------------

#ifdef __WXDEBUG__
    // really just show the assert dialog
    static bool DoShowAssertDialog(const wxString& msg);

    // prepare for showing the assert dialog, use the given traits or
    // DoShowAssertDialog() as last fallback to really show it
    static
    void ShowAssertDialog(const wxChar *szFile,
                          int nLine,
                          const wxChar *szCond,
                          const wxChar *szMsg,
                          wxAppTraits *traits = NULL);

    // turn on the trace masks specified in the env variable WXTRACE
    static void LINKAGEMODE SetTraceMasks();
#endif // __WXDEBUG__

// ----------------------------------------------------------------------------
// global vars
// ----------------------------------------------------------------------------

wxAppConsole *wxAppConsole::ms_appInstance = NULL;

wxAppInitializerFunction wxAppConsole::ms_appInitFn = NULL;

// ============================================================================
// wxAppConsole implementation
// ============================================================================

// ----------------------------------------------------------------------------
// ctor/dtor
// ----------------------------------------------------------------------------

wxAppConsole::wxAppConsole()
{
    m_traits = NULL;

    ms_appInstance = this;

#ifdef __WXDEBUG__
    SetTraceMasks();
#if wxUSE_UNICODE
    // In unicode mode the SetTraceMasks call can cause an apptraits to be
    // created, but since we are still in the constructor the wrong kind will
    // be created for GUI apps.  Destroy it so it can be created again later.
    delete m_traits;
    m_traits = NULL;
#endif
#endif
}

wxAppConsole::~wxAppConsole()
{
    delete m_traits;
}

// ----------------------------------------------------------------------------
// initilization/cleanup
// ----------------------------------------------------------------------------

bool wxAppConsole::Initialize(int& argc, wxChar **argv)
{
    // remember the command line arguments
    this->argc = argc;
    this->argv = argv;

#ifndef __WXPALMOS__
    if ( m_appName.empty() && argv )
    {
        // the application name is, by default, the name of its executable file
        wxFileName::SplitPath(argv[0], NULL, &m_appName, NULL);
    }
#endif

    return true;
}

void wxAppConsole::CleanUp()
{
}

// ----------------------------------------------------------------------------
// OnXXX() callbacks
// ----------------------------------------------------------------------------

bool wxAppConsole::OnInit()
{
#if wxUSE_CMDLINE_PARSER
    wxCmdLineParser parser(argc, argv);

    OnInitCmdLine(parser);

    bool cont;
    switch ( parser.Parse(false /* don't show usage */) )
    {
        case -1:
            cont = OnCmdLineHelp(parser);
            break;

        case 0:
            cont = OnCmdLineParsed(parser);
            break;

        default:
            cont = OnCmdLineError(parser);
            break;
    }

    if ( !cont )
        return false;
#endif // wxUSE_CMDLINE_PARSER

    return true;
}

int wxAppConsole::OnExit()
{
#if wxUSE_CONFIG
    // delete the config object if any (don't use Get() here, but Set()
    // because Get() could create a new config object)
    delete wxConfigBase::Set((wxConfigBase *) NULL);
#endif // wxUSE_CONFIG

    // use Set(NULL) and not Get() to avoid creating a message output object on
    // demand when we just want to delete it
    delete wxMessageOutput::Set(NULL);

    return 0;
}

void wxAppConsole::Exit()
{
    exit(-1);
}

// ----------------------------------------------------------------------------
// traits stuff
// ----------------------------------------------------------------------------

wxAppTraits *wxAppConsole::CreateTraits()
{
    return new wxConsoleAppTraits;
}

wxAppTraits *wxAppConsole::GetTraits()
{
    // FIXME-MT: protect this with a CS?
    if ( !m_traits )
    {
        m_traits = CreateTraits();

        wxASSERT_MSG( m_traits, _T("wxApp::CreateTraits() failed?") );
    }

    return m_traits;
}

// we must implement CreateXXX() in wxApp itself for backwards compatibility
#if WXWIN_COMPATIBILITY_2_4

#if wxUSE_LOG

wxLog *wxAppConsole::CreateLogTarget()
{
    wxAppTraits *traits = GetTraits();
    return traits ? traits->CreateLogTarget() : NULL;
}

#endif // wxUSE_LOG

wxMessageOutput *wxAppConsole::CreateMessageOutput()
{
    wxAppTraits *traits = GetTraits();
    return traits ? traits->CreateMessageOutput() : NULL;
}

#endif // WXWIN_COMPATIBILITY_2_4

// ----------------------------------------------------------------------------
// event processing
// ----------------------------------------------------------------------------

void wxAppConsole::ProcessPendingEvents()
{
#if wxUSE_THREADS
    if ( !wxPendingEventsLocker )
        return;
#endif
    
    // ensure that we're the only thread to modify the pending events list
    wxENTER_CRIT_SECT( *wxPendingEventsLocker );

    if ( !wxPendingEvents )
    {
        wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
        return;
    }

    // iterate until the list becomes empty
    wxList::compatibility_iterator node = wxPendingEvents->GetFirst();
    while (node)
    {
        wxEvtHandler *handler = (wxEvtHandler *)node->GetData();
        wxPendingEvents->Erase(node);

        // In ProcessPendingEvents(), new handlers might be add
        // and we can safely leave the critical section here.
        wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
        
        handler->ProcessPendingEvents();

        wxENTER_CRIT_SECT( *wxPendingEventsLocker );

        node = wxPendingEvents->GetFirst();
    }

    wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
}

int wxAppConsole::FilterEvent(wxEvent& WXUNUSED(event))
{
    // process the events normally by default
    return -1;
}

// ----------------------------------------------------------------------------
// exception handling
// ----------------------------------------------------------------------------

#if wxUSE_EXCEPTIONS

void
wxAppConsole::HandleEvent(wxEvtHandler *handler,
                          wxEventFunction func,
                          wxEvent& event) const
{
    // by default, simply call the handler
    (handler->*func)(event);
}

bool
wxAppConsole::OnExceptionInMainLoop()
{
    throw;

    // some compilers are too stupid to know that we never return after throw
#if defined(__DMC__) || (defined(_MSC_VER) && _MSC_VER < 1200)
    return false;
#endif
}

#endif // wxUSE_EXCEPTIONS

// ----------------------------------------------------------------------------
// cmd line parsing
// ----------------------------------------------------------------------------

#if wxUSE_CMDLINE_PARSER

#define OPTION_VERBOSE _T("verbose")

void wxAppConsole::OnInitCmdLine(wxCmdLineParser& parser)
{
    // the standard command line options
    static const wxCmdLineEntryDesc cmdLineDesc[] =
    {
        {
            wxCMD_LINE_SWITCH,
            _T("h"),
            _T("help"),
            gettext_noop("show this help message"),
            wxCMD_LINE_VAL_NONE,
            wxCMD_LINE_OPTION_HELP
        },

#if wxUSE_LOG
        {
            wxCMD_LINE_SWITCH,
            wxEmptyString,
            OPTION_VERBOSE,
            gettext_noop("generate verbose log messages"),
            wxCMD_LINE_VAL_NONE,
            0x0
        },
#endif // wxUSE_LOG

        // terminator
        {
            wxCMD_LINE_NONE,
            wxEmptyString,
            wxEmptyString,
            wxEmptyString,
            wxCMD_LINE_VAL_NONE,
            0x0
        }
    };

    parser.SetDesc(cmdLineDesc);
}

bool wxAppConsole::OnCmdLineParsed(wxCmdLineParser& parser)
{
#if wxUSE_LOG
    if ( parser.Found(OPTION_VERBOSE) )
    {
        wxLog::SetVerbose(true);
    }
#else
    wxUnusedVar(parser);
#endif // wxUSE_LOG

    return true;
}

bool wxAppConsole::OnCmdLineHelp(wxCmdLineParser& parser)
{
    parser.Usage();

    return false;
}

bool wxAppConsole::OnCmdLineError(wxCmdLineParser& parser)
{
    parser.Usage();

    return false;
}

#endif // wxUSE_CMDLINE_PARSER

// ----------------------------------------------------------------------------
// debugging support
// ----------------------------------------------------------------------------

/* static */
bool wxAppConsole::CheckBuildOptions(const char *optionsSignature,
                                     const char *componentName)
{
#if 0 // can't use wxLogTrace, not up and running yet
    printf("checking build options object '%s' (ptr %p) in '%s'\n",
             optionsSignature, optionsSignature, componentName);
#endif

    if ( strcmp(optionsSignature, WX_BUILD_OPTIONS_SIGNATURE) != 0 )
    {
        wxString lib = wxString::FromAscii(WX_BUILD_OPTIONS_SIGNATURE);
        wxString prog = wxString::FromAscii(optionsSignature);
        wxString progName = wxString::FromAscii(componentName);
        wxString msg;

        msg.Printf(_T("Mismatch between the program and library build versions detected.\nThe library used %s,\nand %s used %s."),
                   lib.c_str(), progName.c_str(), prog.c_str());

        wxLogFatalError(msg.c_str());

        // normally wxLogFatalError doesn't return
        return false;
    }
#undef wxCMP

    return true;
}

#ifdef __WXDEBUG__

void wxAppConsole::OnAssert(const wxChar *file,
                            int line,
                            const wxChar *cond,
                            const wxChar *msg)
{
    ShowAssertDialog(file, line, cond, msg, GetTraits());
}

#endif // __WXDEBUG__

#if WXWIN_COMPATIBILITY_2_4

bool wxAppConsole::CheckBuildOptions(const wxBuildOptions& buildOptions)
{
    return CheckBuildOptions(buildOptions.m_signature, "your program");
}

#endif

// ============================================================================
// other classes implementations
// ============================================================================

// ----------------------------------------------------------------------------
// wxConsoleAppTraitsBase
// ----------------------------------------------------------------------------

#if wxUSE_LOG

wxLog *wxConsoleAppTraitsBase::CreateLogTarget()
{
    return new wxLogStderr;
}

#endif // wxUSE_LOG

wxMessageOutput *wxConsoleAppTraitsBase::CreateMessageOutput()
{
    return new wxMessageOutputStderr;
}

#if wxUSE_FONTMAP

wxFontMapper *wxConsoleAppTraitsBase::CreateFontMapper()
{
    return (wxFontMapper *)new wxFontMapperBase;
}

#endif // wxUSE_FONTMAP

wxRendererNative *wxConsoleAppTraitsBase::CreateRenderer()
{
    // console applications don't use renderers
    return NULL;
}

#ifdef __WXDEBUG__
bool wxConsoleAppTraitsBase::ShowAssertDialog(const wxString& msg)
{
    return wxAppTraitsBase::ShowAssertDialog(msg);
}
#endif

bool wxConsoleAppTraitsBase::HasStderr()
{
    // console applications always have stderr, even under Mac/Windows
    return true;
}

void wxConsoleAppTraitsBase::ScheduleForDestroy(wxObject *object)
{
    delete object;
}

void wxConsoleAppTraitsBase::RemoveFromPendingDelete(wxObject * WXUNUSED(object))
{
    // nothing to do
}

#if wxUSE_SOCKETS
GSocketGUIFunctionsTable* wxConsoleAppTraitsBase::GetSocketGUIFunctionsTable()
{
    return NULL;
}
#endif

// ----------------------------------------------------------------------------
// wxAppTraits
// ----------------------------------------------------------------------------

#ifdef __WXDEBUG__

bool wxAppTraitsBase::ShowAssertDialog(const wxString& msg)
{
    return DoShowAssertDialog(msg);
}

#endif // __WXDEBUG__

// ============================================================================
// global functions implementation
// ============================================================================

void wxExit()
{
    if ( wxTheApp )
    {
        wxTheApp->Exit();
    }
    else
    {
        // what else can we do?
        exit(-1);
    }
}

void wxWakeUpIdle()
{
    if ( wxTheApp )
    {
        wxTheApp->WakeUpIdle();
    }
    //else: do nothing, what can we do?
}

#ifdef  __WXDEBUG__

// wxASSERT() helper
bool wxAssertIsEqual(int x, int y)
{
    return x == y;
}

// break into the debugger
void wxTrap()
{
#if defined(__WXMSW__) && !defined(__WXMICROWIN__)
    DebugBreak();
#elif defined(__WXMAC__) && !defined(__DARWIN__)
    #if __powerc
        Debugger();
    #else
        SysBreak();
    #endif
#elif defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
    Debugger();
#elif defined(__UNIX__)
    raise(SIGTRAP);
#else
    // TODO
#endif // Win/Unix
}

void wxAssert(int cond,
              const wxChar *szFile,
              int nLine,
              const wxChar *szCond,
              const wxChar *szMsg)
{
    if ( !cond )
        wxOnAssert(szFile, nLine, szCond, szMsg);
}

// this function is called when an assert fails
void wxOnAssert(const wxChar *szFile,
                int nLine,
                const wxChar *szCond,
                const wxChar *szMsg)
{
    // FIXME MT-unsafe
    static bool s_bInAssert = false;

    if ( s_bInAssert )
    {
        // He-e-e-e-elp!! we're trapped in endless loop
        wxTrap();

        s_bInAssert = false;

        return;
    }

    s_bInAssert = true;

    if ( !wxTheApp )
    {
        // by default, show the assert dialog box -- we can't customize this
        // behaviour
        ShowAssertDialog(szFile, nLine, szCond, szMsg);
    }
    else
    {
        // let the app process it as it wants
        wxTheApp->OnAssert(szFile, nLine, szCond, szMsg);
    }

    s_bInAssert = false;
}

#endif // __WXDEBUG__

// ============================================================================
// private functions implementation
// ============================================================================

#ifdef __WXDEBUG__

static void LINKAGEMODE SetTraceMasks()
{
#if wxUSE_LOG
    wxString mask;
    if ( wxGetEnv(wxT("WXTRACE"), &mask) )
    {
        wxStringTokenizer tkn(mask, wxT(",;:"));
        while ( tkn.HasMoreTokens() )
            wxLog::AddTraceMask(tkn.GetNextToken());
    }
#endif // wxUSE_LOG
}

bool DoShowAssertDialog(const wxString& msg)
{
    // under MSW we can show the dialog even in the console mode
#if defined(__WXMSW__) && !defined(__WXMICROWIN__)
    wxString msgDlg(msg);

    // this message is intentionally not translated -- it is for
    // developpers only
    msgDlg += wxT("\nDo you want to stop the program?\n")
              wxT("You can also choose [Cancel] to suppress ")
              wxT("further warnings.");

    switch ( ::MessageBox(NULL, msgDlg, _T("wxWidgets Debug Alert"),
                          MB_YESNOCANCEL | MB_ICONSTOP ) )
    {
        case IDYES:
            wxTrap();
            break;

        case IDCANCEL:
            // stop the asserts
            return true;

        //case IDNO: nothing to do
    }
#else // !__WXMSW__
    wxFprintf(stderr, wxT("%s\n"), msg.c_str());
    fflush(stderr);

    // TODO: ask the user to enter "Y" or "N" on the console?
    wxTrap();
#endif // __WXMSW__/!__WXMSW__

    // continue with the asserts
    return false;
}

#if wxUSE_STACKWALKER
static wxString GetAssertStackTrace()
{
    wxString stackTrace;

#if wxUSE_DBGHELP
    // check that we can get the stack trace before trying to do it
    if ( !wxDbgHelpDLL::Init() )
        return stackTrace;
#endif
    
    class StackDump : public wxStackWalker
    {
    public:
        StackDump() { }

        const wxString& GetStackTrace() const { return m_stackTrace; }

    protected:
        virtual void OnStackFrame(const wxStackFrame& frame)
        {
            m_stackTrace << wxString::Format(_T("[%02d] "), frame.GetLevel());

            wxString name = frame.GetName();
            if ( !name.empty() )
            {
                m_stackTrace << wxString::Format(_T("%-40s"), name.c_str());
            }
            else
            {
                m_stackTrace << wxString::Format
                                (
                                    _T("0x%08lx"),
                                    (unsigned long)frame.GetAddress()
                                );
            }

            if ( frame.HasSourceLocation() )
            {
                m_stackTrace << _T('\t')
                             << frame.GetFileName()
                             << _T(':')
                             << frame.GetLine();
            }

            m_stackTrace << _T('\n');
        }

    private:
        wxString m_stackTrace;
    };

    StackDump dump;
    dump.Walk(5); // don't show OnAssert() call itself
    stackTrace = dump.GetStackTrace();

    // don't show more than maxLines or we could get a dialog too tall to be
    // shown on screen: 20 should be ok everywhere as even with 15 pixel high
    // characters it is still only 300 pixels...
    static const int maxLines = 20;
    const int count = stackTrace.Freq(wxT('\n'));
    for ( int i = 0; i < count - maxLines; i++ )
        stackTrace = stackTrace.BeforeLast(wxT('\n'));

    return stackTrace;
}
#endif // wxUSE_STACKWALKER

// show the assert modal dialog
static
void ShowAssertDialog(const wxChar *szFile,
                      int nLine,
                      const wxChar *szCond,
                      const wxChar *szMsg,
                      wxAppTraits *traits)
{
    // this variable can be set to true to suppress "assert failure" messages
    static bool s_bNoAsserts = false;

    wxString msg;
    msg.reserve(2048);

    // make life easier for people using VC++ IDE by using this format: like
    // this, clicking on the message will take us immediately to the place of
    // the failed assert
    msg.Printf(wxT("%s(%d): assert \"%s\" failed"), szFile, nLine, szCond);

    if ( szMsg )
    {
        msg << _T(": ") << szMsg;
    }
    else // no message given
    {
        msg << _T('.');
    }

#if wxUSE_STACKWALKER
    const wxString stackTrace = GetAssertStackTrace();
    if ( !stackTrace.empty() )
    {
        msg << _T("\n\nCall stack:\n") << stackTrace;
    }
#endif // wxUSE_STACKWALKER

#if wxUSE_THREADS
    // if we are not in the main thread, output the assert directly and trap
    // since dialogs cannot be displayed
    if ( !wxThread::IsMain() )
    {
        msg += wxT(" [in child thread]");

#if defined(__WXMSW__) && !defined(__WXMICROWIN__)
        msg << wxT("\r\n");
        OutputDebugString(msg );
#else
        // send to stderr
        wxFprintf(stderr, wxT("%s\n"), msg.c_str());
        fflush(stderr);
#endif
        // He-e-e-e-elp!! we're asserting in a child thread
        wxTrap();
    }
    else
#endif // wxUSE_THREADS

    if ( !s_bNoAsserts )
    {
        // send it to the normal log destination
        wxLogDebug(_T("%s"), msg.c_str());

        if ( traits )
        {
            // delegate showing assert dialog (if possible) to that class
            s_bNoAsserts = traits->ShowAssertDialog(msg);
        }
        else // no traits object
        {
            // fall back to the function of last resort
            s_bNoAsserts = DoShowAssertDialog(msg);
        }
    }
}

#endif // __WXDEBUG__