src/common/dynlib.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        dynlib.cpp
// Purpose:     Dynamic library management
// Author:      Guilhem Lavaux
// Modified by:
// Created:     20/07/98
// RCS-ID:      $Id$
// Copyright:   (c) Guilhem Lavaux
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

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

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

#ifdef __GNUG__
#   pragma implementation "dynlib.h"
#endif

#include  "wx/wxprec.h"

#ifdef __BORLANDC__
  #pragma hdrstop
#endif

#if wxUSE_DYNLIB_CLASS

#if defined(__WINDOWS__)
    #include "wx/msw/private.h"
#endif

#include "wx/dynlib.h"
#include "wx/filefn.h"
#include "wx/intl.h"
#include "wx/log.h"

// ----------------------------------------------------------------------------
// conditional compilation
// ----------------------------------------------------------------------------

#if defined(__WXPM__) || defined(__EMX__)
#  define INCL_DOS
#  include <os2.h>
#  define wxDllOpen(error, lib, handle)     DosLoadModule(error, sizeof(error), lib, &handle)
#  define wxDllGetSymbol(handle, modaddr)   DosQueryProcAddr(handle, 1L, NULL, (PFN*)modaddr)
#  define wxDllClose(handle)                DosFreeModule(handle)
#elif defined(HAVE_DLOPEN)
    // note about dlopen() flags: we use RTLD_NOW to have more Windows-like
    // behaviour (Win won't let you load a library with missing symbols) and
    // RTLD_GLOBAL because it is needed sometimes and probably doesn't hurt
    // otherwise. On True64-Unix RTLD_GLOBAL is not allowed and on VMS the
    // second argument on dlopen is ignored.
#ifdef __VMS
# define wxDllOpen(lib)                dlopen(lib.fn_str(), 0 )
#elif defined( __osf__ )
# define wxDllOpen(lib)                dlopen(lib.fn_str(), RTLD_LAZY )
#else
# define wxDllOpen(lib)                dlopen(lib.fn_str(), RTLD_LAZY | RTLD_GLOBAL)
#endif
#define wxDllGetSymbol(handle, name)  dlsym(handle, name)
#   define wxDllClose                    dlclose
#elif defined(HAVE_SHL_LOAD)
#   define wxDllOpen(lib)                shl_load(lib.fn_str(), BIND_DEFERRED, 0)
#   define wxDllClose                    shl_unload

static inline void *wxDllGetSymbol(shl_t handle, const wxString& name)
{
    void *sym;
    if ( shl_findsym(&handle, name.mb_str(), TYPE_UNDEFINED, &sym) == 0 )
        return sym;
    else
        return 0;
}

#elif defined(__DARWIN__)
/* Porting notes:
 *   The dlopen port is a port from dl_next.xs by Anno Siegel.
 *   dl_next.xs is itself a port from dl_dlopen.xs by Paul Marquess.
 *   The method used here is just to supply the sun style dlopen etc.
 *   functions in terms of Darwin NS*.
 */
void *dlopen(const char *path, int mode /* mode is ignored */);
void *dlsym(void *handle, const char *symbol);
int   dlclose(void *handle);
const char *dlerror(void);

#   define wxDllOpen(lib)                dlopen(lib.fn_str(), 0)
#   define wxDllGetSymbol(handle, name)  dlsym(handle, name)
#   define wxDllClose                    dlclose
#elif defined(__WINDOWS__)
    // using LoadLibraryEx under Win32 to avoid name clash with LoadLibrary
#   ifdef __WIN32__
#ifdef _UNICODE
#      define wxDllOpen(lib)                  ::LoadLibraryExW(lib, 0, 0)
#else
#      define wxDllOpen(lib)                  ::LoadLibraryExA(lib, 0, 0)
#endif
#   else   // Win16
#      define wxDllOpen(lib)                  ::LoadLibrary(lib)
#   endif  // Win32/16
#   define wxDllGetSymbol(handle, name)    ::GetProcAddress(handle, name)
#   define wxDllClose                      ::FreeLibrary
#elif defined(__WXMAC__)
#   define wxDllClose(handle)               CloseConnection(&handle)
#else
#   error "Don't know how to load shared libraries on this platform."
#endif // OS

// ---------------------------------------------------------------------------
// Global variables
// ---------------------------------------------------------------------------

wxLibraries wxTheLibraries;

// ============================================================================
// implementation
// ============================================================================

// construct the full name from the base shared object name: adds a .dll
// suffix under Windows or .so under Unix
static wxString ConstructLibraryName(const wxString& basename)
{
    wxString fullname;
    fullname << basename << wxDllLoader::GetDllExt();

    return fullname;
}

// ---------------------------------------------------------------------------
// wxLibrary (one instance per dynamic library)
// ---------------------------------------------------------------------------

wxLibrary::wxLibrary(wxDllType handle)
{
    typedef wxClassInfo *(*t_get_first)(void);
    t_get_first get_first;

    m_handle = handle;

    // Some system may use a local heap for library.
    get_first = (t_get_first)GetSymbol("wxGetClassFirst");
    // It is a wxWindows DLL.
    if (get_first)
        PrepareClasses(get_first());
}

wxLibrary::~wxLibrary()
{
    if ( m_handle )
    {
        wxDllClose(m_handle);
    }
}

wxObject *wxLibrary::CreateObject(const wxString& name)
{
    wxClassInfo *info = (wxClassInfo *)classTable.Get(name);

    if (!info)
        return NULL;

    return info->CreateObject();
}

void wxLibrary::PrepareClasses(wxClassInfo *first)
{
    // Index all class infos by their class name
    wxClassInfo *info = first;
    while (info)
    {
        if (info->m_className)
            classTable.Put(info->m_className, (wxObject *)info);
        info = info->m_next;
    }

    // Set base pointers for each wxClassInfo
    info = first;
    while (info)
    {
        if (info->GetBaseClassName1())
            info->m_baseInfo1 = (wxClassInfo *)classTable.Get(info->GetBaseClassName1());
        if (info->GetBaseClassName2())
            info->m_baseInfo2 = (wxClassInfo *)classTable.Get(info->GetBaseClassName2());
        info = info->m_next;
    }
}

void *wxLibrary::GetSymbol(const wxString& symbname)
{
   return wxDllLoader::GetSymbol(m_handle, symbname);
}

// ---------------------------------------------------------------------------
// wxDllLoader
// ---------------------------------------------------------------------------


#if defined(__WINDOWS__) || defined(__WXPM__) || defined(__EMX__)
const wxString wxDllLoader::ms_dllext( _T(".dll") );
#elif defined(__UNIX__)
#if defined(__HPUX__)
const wxString wxDllLoader::ms_dllext( _T(".sl") );
#else
const wxString wxDllLoader::ms_dllext( _T(".so") );
#endif
#endif

/* static */
wxDllType wxDllLoader::GetProgramHandle()
{
#if defined( HAVE_DLOPEN ) && !defined(__EMX__)
   // optain handle for main program
   return dlopen(NULL, RTLD_NOW/*RTLD_LAZY*/);
#elif defined (HAVE_SHL_LOAD)
   // shl_findsymbol with NULL handle looks up in main program
   return 0;
#else
   wxFAIL_MSG( wxT("This method is not implemented under Windows or OS/2"));
   return 0;
#endif
}

/* static */
wxDllType wxDllLoader::LoadLibrary(const wxString & libname, bool *success)
{
    wxDllType   handle;
    bool        failed = FALSE;

#if defined(__WXMAC__) && !defined(__UNIX__)
    FSSpec      myFSSpec;
    Ptr         myMainAddr;
    Str255      myErrName;

    wxMacFilename2FSSpec( libname , &myFSSpec );

    if( GetDiskFragment( &myFSSpec,
                         0,
                         kCFragGoesToEOF,
                         "\p",
                         kPrivateCFragCopy,
                         &handle,
                         &myMainAddr,
                         myErrName ) != noErr )
    {
        p2cstr( myErrName );
        wxLogSysError( _("Failed to load shared library '%s' Error '%s'"),
                       libname.c_str(),
                       (char*)myErrName );
        handle = 0;
        failed = TRUE;
    }

#elif defined(__WXPM__) || defined(__EMX__)
    char        zError[256] = "";
    wxDllOpen(zError, libname, handle);

#else
    handle = wxDllOpen(libname);

#endif

    if ( !handle )
    {
        wxString msg(_("Failed to load shared library '%s'"));

#ifdef HAVE_DLERROR
        const wxChar *err = dlerror();
        if( err )
        {
            failed = TRUE;
            wxLogError( msg, err );
        }
#else
        failed = TRUE;
        wxLogSysError( msg, libname.c_str() );
#endif
    }

    if ( success )
        *success = !failed;

    return handle;
}


/* static */
void wxDllLoader::UnloadLibrary(wxDllType handle)
{
   wxDllClose(handle);
}

/* static */
void *wxDllLoader::GetSymbol(wxDllType dllHandle, const wxString &name, bool *success)
{
    bool    failed = FALSE;
    void    *symbol = 0;

#if defined(__WXMAC__) && !defined(__UNIX__)
    Ptr                 symAddress;
    CFragSymbolClass    symClass;
    Str255              symName;

#if TARGET_CARBON
    c2pstrcpy( (StringPtr) symName, name );
#else
    strcpy( (char *) symName, name );
    c2pstr( (char *) symName );
#endif
    if( FindSymbol( dllHandle, symName, &symAddress, &symClass ) == noErr )
        symbol = (void *)symAddress;

#elif defined(__WXPM__) || defined(__EMX__)
    wxDllGetSymbol(dllHandle, symbol);

#else
    // mb_str() is necessary in Unicode build
    symbol = wxDllGetSymbol(dllHandle, name.mb_str());

#endif

    if ( !symbol )
    {
        wxString msg(_("wxDllLoader failed to GetSymbol '%s'"));

#ifdef HAVE_DLERROR
        const wxChar *err = dlerror();
        if( err )
        {
            failed = TRUE;
            wxLogError( msg, err );
        }
#else
        failed = TRUE;
        wxLogSysError(_("Couldn't find symbol '%s' in a dynamic library"),
                      name.c_str());
#endif
    }

    if( success )
        *success = !failed;

    return symbol;
}

// ---------------------------------------------------------------------------
// wxLibraries (only one instance should normally exist)
// ---------------------------------------------------------------------------

wxLibraries::wxLibraries():m_loaded(wxKEY_STRING)
{
}

wxLibraries::~wxLibraries()
{
    wxNode *node = m_loaded.First();

    while (node) {
        wxLibrary *lib = (wxLibrary *)node->Data();
        delete lib;

        node = node->Next();
    }
}

wxLibrary *wxLibraries::LoadLibrary(const wxString& name)
{
    wxLibrary   *lib;
    wxClassInfo *old_sm_first;
    wxNode      *node = m_loaded.Find(name.GetData());

    if (node != NULL)
        return ((wxLibrary *)node->Data());

    // If DLL shares data, this is necessary.
    old_sm_first = wxClassInfo::sm_first;
    wxClassInfo::sm_first = NULL;

    wxString libname = ConstructLibraryName(name);

    bool success = FALSE;
    wxDllType handle = wxDllLoader::LoadLibrary(libname, &success);
    if(success)
    {
       lib = new wxLibrary(handle);
       wxClassInfo::sm_first = old_sm_first;

       m_loaded.Append(name.GetData(), lib);
    }
    else
       lib = NULL;
    return lib;
}

wxObject *wxLibraries::CreateObject(const wxString& path)
{
    wxNode *node = m_loaded.First();
    wxObject *obj;

    while (node) {
        obj = ((wxLibrary *)node->Data())->CreateObject(path);
        if (obj)
            return obj;

        node = node->Next();
    }
    return NULL;
}

#ifdef __DARWIN__
// ---------------------------------------------------------------------------
// For Darwin/Mac OS X
//   supply the sun style dlopen functions in terms of Darwin NS*
// ---------------------------------------------------------------------------

extern "C" {
#import <mach-o/dyld.h>
};

enum dyldErrorSource
{
    OFImage,
};

static char dl_last_error[1024];

static
void TranslateError(const char *path, enum dyldErrorSource type, int number)
{
    unsigned int index;
    static char *OFIErrorStrings[] =
    {
	"%s(%d): Object Image Load Failure\n",
	"%s(%d): Object Image Load Success\n",
	"%s(%d): Not an recognisable object file\n",
	"%s(%d): No valid architecture\n",
	"%s(%d): Object image has an invalid format\n",
	"%s(%d): Invalid access (permissions?)\n",
	"%s(%d): Unknown error code from NSCreateObjectFileImageFromFile\n",
    };
#define NUM_OFI_ERRORS (sizeof(OFIErrorStrings) / sizeof(OFIErrorStrings[0]))

    switch (type)
    {
     case OFImage:
	 index = number;
	 if (index > NUM_OFI_ERRORS - 1) {
	     index = NUM_OFI_ERRORS - 1;
	 }
	 sprintf(dl_last_error, OFIErrorStrings[index], path, number);
	 break;

     default:
	 sprintf(dl_last_error, "%s(%d): Totally unknown error type %d\n",
		 path, number, type);
	 break;
    }
}

const char *dlerror()
{
    return dl_last_error;
}

void *dlopen(const char *path, int mode /* mode is ignored */)
{
    int dyld_result;
    NSObjectFileImage ofile;
    NSModule handle = NULL;

    dyld_result = NSCreateObjectFileImageFromFile(path, &ofile);
    if (dyld_result != NSObjectFileImageSuccess)
    {
	TranslateError(path, OFImage, dyld_result);
    }
    else
    {
	// NSLinkModule will cause the run to abort on any link error's
	// not very friendly but the error recovery functionality is limited.
	handle = NSLinkModule(ofile, path, TRUE);
    }

    return handle;
}

int dlclose(void *handle) /* stub only */
{
    return 0;
}

void *dlsym(void *handle, const char *symbol)
{
    void *addr;

    if (NSIsSymbolNameDefined(symbol)) {
	addr = NSAddressOfSymbol(NSLookupAndBindSymbol(symbol));
    }
    else {
	addr = NULL;
    }
    return addr;
}

#endif // __DARWIN__

#endif // wxUSE_DYNLIB_CLASS
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: dynlib.cpp
	3	// Purpose: Dynamic library management
	4	// Author: Guilhem Lavaux
	5	// Modified by:
	6	// Created: 20/07/98
	7	// RCS-ID: $Id$
	8	// Copyright: (c) Guilhem Lavaux
	9	// Licence: wxWindows license
	10	/////////////////////////////////////////////////////////////////////////////
	11
	12	// ============================================================================
	13	// declarations
	14	// ============================================================================
	15
	16	// ----------------------------------------------------------------------------
	17	// headers
	18	// ----------------------------------------------------------------------------
	19
	20	#ifdef __GNUG__
	21	# pragma implementation "dynlib.h"
	22	#endif
	23
	24	#include "wx/wxprec.h"
	25
	26	#ifdef __BORLANDC__
	27	#pragma hdrstop
	28	#endif
	29
	30	#if wxUSE_DYNLIB_CLASS
	31
	32	#if defined(__WINDOWS__)
	33	#include "wx/msw/private.h"
	34	#endif
	35
	36	#include "wx/dynlib.h"
	37	#include "wx/filefn.h"
	38	#include "wx/intl.h"
	39	#include "wx/log.h"
	40
	41	// ----------------------------------------------------------------------------
	42	// conditional compilation
	43	// ----------------------------------------------------------------------------
	44
	45	#if defined(__WXPM__) \|\| defined(__EMX__)
	46	# define INCL_DOS
	47	# include <os2.h>
	48	# define wxDllOpen(error, lib, handle) DosLoadModule(error, sizeof(error), lib, &handle)
	49	# define wxDllGetSymbol(handle, modaddr) DosQueryProcAddr(handle, 1L, NULL, (PFN*)modaddr)
	50	# define wxDllClose(handle) DosFreeModule(handle)
	51	#elif defined(HAVE_DLOPEN)
	52	// note about dlopen() flags: we use RTLD_NOW to have more Windows-like
	53	// behaviour (Win won't let you load a library with missing symbols) and
	54	// RTLD_GLOBAL because it is needed sometimes and probably doesn't hurt
	55	// otherwise. On True64-Unix RTLD_GLOBAL is not allowed and on VMS the
	56	// second argument on dlopen is ignored.
	57	#ifdef __VMS
	58	# define wxDllOpen(lib) dlopen(lib.fn_str(), 0 )
	59	#elif defined( __osf__ )
	60	# define wxDllOpen(lib) dlopen(lib.fn_str(), RTLD_LAZY )
	61	#else
	62	# define wxDllOpen(lib) dlopen(lib.fn_str(), RTLD_LAZY \| RTLD_GLOBAL)
	63	#endif
	64	#define wxDllGetSymbol(handle, name) dlsym(handle, name)
	65	# define wxDllClose dlclose
	66	#elif defined(HAVE_SHL_LOAD)
	67	# define wxDllOpen(lib) shl_load(lib.fn_str(), BIND_DEFERRED, 0)
	68	# define wxDllClose shl_unload
	69
	70	static inline void *wxDllGetSymbol(shl_t handle, const wxString& name)
	71	{
	72	void *sym;
	73	if ( shl_findsym(&handle, name.mb_str(), TYPE_UNDEFINED, &sym) == 0 )
	74	return sym;
	75	else
	76	return 0;
	77	}
	78
	79	#elif defined(__DARWIN__)
	80	/* Porting notes:
	81	* The dlopen port is a port from dl_next.xs by Anno Siegel.
	82	* dl_next.xs is itself a port from dl_dlopen.xs by Paul Marquess.
	83	* The method used here is just to supply the sun style dlopen etc.
	84	* functions in terms of Darwin NS*.
	85	*/
	86	void dlopen(const char path, int mode /* mode is ignored */);
	87	void dlsym(void handle, const char *symbol);
	88	int dlclose(void *handle);
	89	const char *dlerror(void);
	90
	91	# define wxDllOpen(lib) dlopen(lib.fn_str(), 0)
	92	# define wxDllGetSymbol(handle, name) dlsym(handle, name)
	93	# define wxDllClose dlclose
	94	#elif defined(__WINDOWS__)
	95	// using LoadLibraryEx under Win32 to avoid name clash with LoadLibrary
	96	# ifdef __WIN32__
	97	#ifdef _UNICODE
	98	# define wxDllOpen(lib) ::LoadLibraryExW(lib, 0, 0)
	99	#else
	100	# define wxDllOpen(lib) ::LoadLibraryExA(lib, 0, 0)
	101	#endif
	102	# else // Win16
	103	# define wxDllOpen(lib) ::LoadLibrary(lib)
	104	# endif // Win32/16
	105	# define wxDllGetSymbol(handle, name) ::GetProcAddress(handle, name)
	106	# define wxDllClose ::FreeLibrary
	107	#elif defined(__WXMAC__)
	108	# define wxDllClose(handle) CloseConnection(&handle)
	109	#else
	110	# error "Don't know how to load shared libraries on this platform."
	111	#endif // OS
	112
	113	// ---------------------------------------------------------------------------
	114	// Global variables
	115	// ---------------------------------------------------------------------------
	116
	117	wxLibraries wxTheLibraries;
	118
	119	// ============================================================================
	120	// implementation
	121	// ============================================================================
	122
	123	// construct the full name from the base shared object name: adds a .dll
	124	// suffix under Windows or .so under Unix
	125	static wxString ConstructLibraryName(const wxString& basename)
	126	{
	127	wxString fullname;
	128	fullname << basename << wxDllLoader::GetDllExt();
	129
	130	return fullname;
	131	}
	132
	133	// ---------------------------------------------------------------------------
	134	// wxLibrary (one instance per dynamic library)
	135	// ---------------------------------------------------------------------------
	136
	137	wxLibrary::wxLibrary(wxDllType handle)
	138	{
	139	typedef wxClassInfo (t_get_first)(void);
	140	t_get_first get_first;
	141
	142	m_handle = handle;
	143
	144	// Some system may use a local heap for library.
	145	get_first = (t_get_first)GetSymbol("wxGetClassFirst");
	146	// It is a wxWindows DLL.
	147	if (get_first)
	148	PrepareClasses(get_first());
	149	}
	150
	151	wxLibrary::~wxLibrary()
	152	{
	153	if ( m_handle )
	154	{
	155	wxDllClose(m_handle);
	156	}
	157	}
	158
	159	wxObject *wxLibrary::CreateObject(const wxString& name)
	160	{
	161	wxClassInfo info = (wxClassInfo )classTable.Get(name);
	162
	163	if (!info)
	164	return NULL;
	165
	166	return info->CreateObject();
	167	}
	168
	169	void wxLibrary::PrepareClasses(wxClassInfo *first)
	170	{
	171	// Index all class infos by their class name
	172	wxClassInfo *info = first;
	173	while (info)
	174	{
	175	if (info->m_className)
	176	classTable.Put(info->m_className, (wxObject *)info);
	177	info = info->m_next;
	178	}
	179
	180	// Set base pointers for each wxClassInfo
	181	info = first;
	182	while (info)
	183	{
	184	if (info->GetBaseClassName1())
	185	info->m_baseInfo1 = (wxClassInfo *)classTable.Get(info->GetBaseClassName1());
	186	if (info->GetBaseClassName2())
	187	info->m_baseInfo2 = (wxClassInfo *)classTable.Get(info->GetBaseClassName2());
	188	info = info->m_next;
	189	}
	190	}
	191
	192	void *wxLibrary::GetSymbol(const wxString& symbname)
	193	{
	194	return wxDllLoader::GetSymbol(m_handle, symbname);
	195	}
	196
	197	// ---------------------------------------------------------------------------
	198	// wxDllLoader
	199	// ---------------------------------------------------------------------------
	200
	201
	202	#if defined(__WINDOWS__) \|\| defined(__WXPM__) \|\| defined(__EMX__)
	203	const wxString wxDllLoader::ms_dllext( _T(".dll") );
	204	#elif defined(__UNIX__)
	205	#if defined(__HPUX__)
	206	const wxString wxDllLoader::ms_dllext( _T(".sl") );
	207	#else
	208	const wxString wxDllLoader::ms_dllext( _T(".so") );
	209	#endif
	210	#endif
	211
	212	/* static */
	213	wxDllType wxDllLoader::GetProgramHandle()
	214	{
	215	#if defined( HAVE_DLOPEN ) && !defined(__EMX__)
	216	// optain handle for main program
	217	return dlopen(NULL, RTLD_NOW/RTLD_LAZY/);
	218	#elif defined (HAVE_SHL_LOAD)
	219	// shl_findsymbol with NULL handle looks up in main program
	220	return 0;
	221	#else
	222	wxFAIL_MSG( wxT("This method is not implemented under Windows or OS/2"));
	223	return 0;
	224	#endif
	225	}
	226
	227	/* static */
	228	wxDllType wxDllLoader::LoadLibrary(const wxString & libname, bool *success)
	229	{
	230	wxDllType handle;
	231	bool failed = FALSE;
	232
	233	#if defined(__WXMAC__) && !defined(__UNIX__)
	234	FSSpec myFSSpec;
	235	Ptr myMainAddr;
	236	Str255 myErrName;
	237
	238	wxMacFilename2FSSpec( libname , &myFSSpec );
	239
	240	if( GetDiskFragment( &myFSSpec,
	241	0,
	242	kCFragGoesToEOF,
	243	"\p",
	244	kPrivateCFragCopy,
	245	&handle,
	246	&myMainAddr,
	247	myErrName ) != noErr )
	248	{
	249	p2cstr( myErrName );
	250	wxLogSysError( _("Failed to load shared library '%s' Error '%s'"),
	251	libname.c_str(),
	252	(char*)myErrName );
	253	handle = 0;
	254	failed = TRUE;
	255	}
	256
	257	#elif defined(__WXPM__) \|\| defined(__EMX__)
	258	char zError[256] = "";
	259	wxDllOpen(zError, libname, handle);
	260
	261	#else
	262	handle = wxDllOpen(libname);
	263
	264	#endif
	265
	266	if ( !handle )
	267	{
	268	wxString msg(_("Failed to load shared library '%s'"));
	269
	270	#ifdef HAVE_DLERROR
	271	const wxChar *err = dlerror();
	272	if( err )
	273	{
	274	failed = TRUE;
	275	wxLogError( msg, err );
	276	}
	277	#else
	278	failed = TRUE;
	279	wxLogSysError( msg, libname.c_str() );
	280	#endif
	281	}
	282
	283	if ( success )
	284	*success = !failed;
	285
	286	return handle;
	287	}
	288
	289
	290	/* static */
	291	void wxDllLoader::UnloadLibrary(wxDllType handle)
	292	{
	293	wxDllClose(handle);
	294	}
	295
	296	/* static */
	297	void wxDllLoader::GetSymbol(wxDllType dllHandle, const wxString &name, bool success)
	298	{
	299	bool failed = FALSE;
	300	void *symbol = 0;
	301
	302	#if defined(__WXMAC__) && !defined(__UNIX__)
	303	Ptr symAddress;
	304	CFragSymbolClass symClass;
	305	Str255 symName;
	306
	307	#if TARGET_CARBON
	308	c2pstrcpy( (StringPtr) symName, name );
	309	#else
	310	strcpy( (char *) symName, name );
	311	c2pstr( (char *) symName );
	312	#endif
	313	if( FindSymbol( dllHandle, symName, &symAddress, &symClass ) == noErr )
	314	symbol = (void *)symAddress;
	315
	316	#elif defined(__WXPM__) \|\| defined(__EMX__)
	317	wxDllGetSymbol(dllHandle, symbol);
	318
	319	#else
	320	// mb_str() is necessary in Unicode build
	321	symbol = wxDllGetSymbol(dllHandle, name.mb_str());
	322
	323	#endif
	324
	325	if ( !symbol )
	326	{
	327	wxString msg(_("wxDllLoader failed to GetSymbol '%s'"));
	328
	329	#ifdef HAVE_DLERROR
	330	const wxChar *err = dlerror();
	331	if( err )
	332	{
	333	failed = TRUE;
	334	wxLogError( msg, err );
	335	}
	336	#else
	337	failed = TRUE;
	338	wxLogSysError(_("Couldn't find symbol '%s' in a dynamic library"),
	339	name.c_str());
	340	#endif
	341	}
	342
	343	if( success )
	344	*success = !failed;
	345
	346	return symbol;
	347	}
	348
	349	// ---------------------------------------------------------------------------
	350	// wxLibraries (only one instance should normally exist)
	351	// ---------------------------------------------------------------------------
	352
	353	wxLibraries::wxLibraries():m_loaded(wxKEY_STRING)
	354	{
	355	}
	356
	357	wxLibraries::~wxLibraries()
	358	{
	359	wxNode *node = m_loaded.First();
	360
	361	while (node) {
	362	wxLibrary lib = (wxLibrary )node->Data();
	363	delete lib;
	364
	365	node = node->Next();
	366	}
	367	}
	368
	369	wxLibrary *wxLibraries::LoadLibrary(const wxString& name)
	370	{
	371	wxLibrary *lib;
	372	wxClassInfo *old_sm_first;
	373	wxNode *node = m_loaded.Find(name.GetData());
	374
	375	if (node != NULL)
	376	return ((wxLibrary *)node->Data());
	377
	378	// If DLL shares data, this is necessary.
	379	old_sm_first = wxClassInfo::sm_first;
	380	wxClassInfo::sm_first = NULL;
	381
	382	wxString libname = ConstructLibraryName(name);
	383
	384	bool success = FALSE;
	385	wxDllType handle = wxDllLoader::LoadLibrary(libname, &success);
	386	if(success)
	387	{
	388	lib = new wxLibrary(handle);
	389	wxClassInfo::sm_first = old_sm_first;
	390
	391	m_loaded.Append(name.GetData(), lib);
	392	}
	393	else
	394	lib = NULL;
	395	return lib;
	396	}
	397
	398	wxObject *wxLibraries::CreateObject(const wxString& path)
	399	{
	400	wxNode *node = m_loaded.First();
	401	wxObject *obj;
	402
	403	while (node) {
	404	obj = ((wxLibrary *)node->Data())->CreateObject(path);
	405	if (obj)
	406	return obj;
	407
	408	node = node->Next();
	409	}
	410	return NULL;
	411	}
	412
	413	#ifdef __DARWIN__
	414	// ---------------------------------------------------------------------------
	415	// For Darwin/Mac OS X
	416	// supply the sun style dlopen functions in terms of Darwin NS*
	417	// ---------------------------------------------------------------------------
	418
	419	extern "C" {
	420	#import <mach-o/dyld.h>
	421	};
	422
	423	enum dyldErrorSource
	424	{
	425	OFImage,
	426	};
	427
	428	static char dl_last_error[1024];
	429
	430	static
	431	void TranslateError(const char *path, enum dyldErrorSource type, int number)
	432	{
	433	unsigned int index;
	434	static char *OFIErrorStrings[] =
	435	{
	436	"%s(%d): Object Image Load Failure\n",
	437	"%s(%d): Object Image Load Success\n",
	438	"%s(%d): Not an recognisable object file\n",
	439	"%s(%d): No valid architecture\n",
	440	"%s(%d): Object image has an invalid format\n",
	441	"%s(%d): Invalid access (permissions?)\n",
	442	"%s(%d): Unknown error code from NSCreateObjectFileImageFromFile\n",
	443	};
	444	#define NUM_OFI_ERRORS (sizeof(OFIErrorStrings) / sizeof(OFIErrorStrings[0]))
	445
	446	switch (type)
	447	{
	448	case OFImage:
	449	index = number;
	450	if (index > NUM_OFI_ERRORS - 1) {
	451	index = NUM_OFI_ERRORS - 1;
	452	}
	453	sprintf(dl_last_error, OFIErrorStrings[index], path, number);
	454	break;
	455
	456	default:
	457	sprintf(dl_last_error, "%s(%d): Totally unknown error type %d\n",
	458	path, number, type);
	459	break;
	460	}
	461	}
	462
	463	const char *dlerror()
	464	{
	465	return dl_last_error;
	466	}
	467
	468	void dlopen(const char path, int mode /* mode is ignored */)
	469	{
	470	int dyld_result;
	471	NSObjectFileImage ofile;
	472	NSModule handle = NULL;
	473
	474	dyld_result = NSCreateObjectFileImageFromFile(path, &ofile);
	475	if (dyld_result != NSObjectFileImageSuccess)
	476	{
	477	TranslateError(path, OFImage, dyld_result);
	478	}
	479	else
	480	{
	481	// NSLinkModule will cause the run to abort on any link error's
	482	// not very friendly but the error recovery functionality is limited.
	483	handle = NSLinkModule(ofile, path, TRUE);
	484	}
	485
	486	return handle;
	487	}
	488
	489	int dlclose(void handle) / stub only */
	490	{
	491	return 0;
	492	}
	493
	494	void dlsym(void handle, const char *symbol)
	495	{
	496	void *addr;
	497
	498	if (NSIsSymbolNameDefined(symbol)) {
	499	addr = NSAddressOfSymbol(NSLookupAndBindSymbol(symbol));
	500	}
	501	else {
	502	addr = NULL;
	503	}
	504	return addr;
	505	}
	506
	507	#endif // __DARWIN__
	508
	509	#endif // wxUSE_DYNLIB_CLASS