X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/7a4b9130e341e8ed5192cac76574119fb6664c6c..7af284fda7500594b2ab86c8ba60138164ab4d04:/include/wx/dynlib.h diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h index a1d3c79464..a08ed217a8 100644 --- a/include/wx/dynlib.h +++ b/include/wx/dynlib.h @@ -1,95 +1,239 @@ -#ifndef __DYNLIB_H__ -#define __DYNLIB_H__ +///////////////////////////////////////////////////////////////////////////// +// Name: wx/dynlib.h +// Purpose: Dynamic library loading classes +// Author: Guilhem Lavaux, Vadim Zeitlin, Vaclav Slavik +// Modified by: +// Created: 20/07/98 +// RCS-ID: $Id$ +// Copyright: (c) 1998 Guilhem Lavaux +// Licence: wxWindows license +///////////////////////////////////////////////////////////////////////////// + +#ifndef _WX_DYNLIB_H__ +#define _WX_DYNLIB_H__ #ifdef __GNUG__ -#pragma interface +# pragma interface #endif -#include -#include -#include - -// --------------------------------------------------------------------------- -// Some more info on a class - -typedef struct { - wxClassInfo *class_info; - wxString path; -} wxClassLibInfo; - -// --------------------------------------------------------------------------- -// Useful arrays - -WX_DEFINE_ARRAY(wxClassInfo *, wxArrayClassInfo); -WX_DEFINE_ARRAY(wxClassLibInfo *, wxArrayClassLibInfo); - -// --------------------------------------------------------------------------- -// wxClassLibrary +#include "wx/setup.h" + +#if wxUSE_DYNLIB_CLASS + +#include "wx/string.h" +#include "wx/list.h" +#include "wx/hash.h" + +// this is normally done by configure, but I leave it here for now... +#if defined(__UNIX__) && !(defined(HAVE_DLOPEN) || defined(HAVE_SHL_LOAD)) +# if defined(__LINUX__) || defined(__SOLARIS__) || defined(__SUNOS__) || defined(__FREEBSD__) +# define HAVE_DLOPEN +# elif defined(__HPUX__) +# define HAVE_SHL_LOAD +# endif // Unix flavour +#endif // !Unix or already have some HAVE_xxx defined + +// Note: WXPM/EMX has to be tested first, since we want to use +// native version, even if configure detected presence of DLOPEN. +#if defined(__WXPM__) || defined(__EMX__) +# define INCL_DOS +# include + typedef HMODULE wxDllType; +#elif defined(HAVE_DLOPEN) +# include + typedef void *wxDllType; +#elif defined(HAVE_SHL_LOAD) +# include + typedef shl_t wxDllType; +#elif defined(__WINDOWS__) +# include // needed to get HMODULE + typedef HMODULE wxDllType; +#elif defined(__DARWIN__) + typedef void *wxDllType; +#elif defined(__WXMAC__) + typedef CFragConnectionID wxDllType; +#else +# error "wxLibrary can't be compiled on this platform, sorry." +#endif // OS + +// LoadLibrary is defined in windows.h as LoadLibraryA, but wxDllLoader method +// should be called LoadLibrary, not LoadLibraryA or LoadLibraryW! +#if defined(__WIN32__) && defined(LoadLibrary) +# include "wx/msw/winundef.h" +#endif -class wxClassLibrary { -protected: - wxArrayClassLibInfo m_list; +// ---------------------------------------------------------------------------- +// wxDllLoader: low level DLL functions, use wxDynamicLibrary in your code +// ---------------------------------------------------------------------------- + +/* + wxDllLoader is a class providing an interface similar to unix's dlopen(). + It is used by wxDynamicLibrary wxLibrary and manages the actual loading of + DLLs and the resolving of symbols in them. There are no instances of this + class, it simply serves as a namespace for its static member functions. +*/ +class WXDLLEXPORT wxDllLoader +{ public: - wxClassLibrary(void); - ~wxClassLibrary(void); - - // Dynamic (un)register a (new) class in the database - void RegisterClass(wxClassInfo *class_info, const wxString& path); - void UnregisterClass(wxClassInfo *class_info); - - // Fetch all infos whose name matches the string (wildcards allowed) - bool FetchInfos(const wxString& path, wxArrayClassLibInfo& infos); + /* + This function loads the shared library libname into memory. + + libname may be either the full path to the file or just the filename in + which case the library is searched for in all standard locations + (use GetDllExt() to construct the filename) + + if success pointer is not NULL, it will be filled with TRUE if everything + went ok and FALSE otherwise + */ + static wxDllType LoadLibrary(const wxString& libname, bool *success = NULL); + + /* + This function unloads the shared library previously loaded with + LoadLibrary + */ + static void UnloadLibrary(wxDllType dll); + + /* + This function returns a valid handle for the main program + itself or NULL if back linking is not supported by the current platform + (e.g. Win32). + */ + static wxDllType GetProgramHandle(); + + /* + This function resolves a symbol in a loaded DLL, such as a + variable or function name. + + dllHandle Handle of the DLL, as returned by LoadDll(). + name Name of the symbol. + + Returns the pointer to the symbol or NULL on error. + */ + static void * GetSymbol(wxDllType dllHandle, const wxString &name); + + // return the standard DLL extension (with leading dot) for this platform + static wxString GetDllExt(); + +private: + // forbid construction of objects + wxDllLoader(); +}; - // Create all objects whose name matches the string (wildcards allowed) - bool CreateObjects(const wxString& path, wxArrayClassInfo& objs); +// ---------------------------------------------------------------------------- +// wxDynamicLibrary - friendly interface to wxDllLoader +// ---------------------------------------------------------------------------- - // Create one object using the EXACT name - wxObject *CreateObject(const wxString& path); +class WXDLLEXPORT wxDynamicLibrary +{ +public: + // ctors + wxDynamicLibrary() { m_library = 0; } + wxDynamicLibrary(const wxString& name) { Load(name); } + + // return TRUE if the library was loaded successfully + bool IsLoaded() const { return m_library != 0; } + operator bool() const { return IsLoaded(); } + + // load the library with the given name (full or not), return TRUE on + // success + bool Load(const wxString& name) + { + m_library = wxDllLoader::LoadLibrary(name); + + return IsLoaded(); + } + + // unload the library, also done automatically in dtor + void Unload() + { + if ( IsLoaded() ) + wxDllLoader::UnloadLibrary(m_library); + } + + // load a symbol from the library, return NULL if an error occured or + // symbol wasn't found + void *GetSymbol(const wxString& name) const + { + wxCHECK_MSG( IsLoaded(), NULL, + _T("can't load symbol from unloaded library") ); + + return wxDllLoader::GetSymbol(m_library, name); + } + + // unload the library + // + // NB: dtor is not virtual, don't derive from this class + ~wxDynamicLibrary() { Unload(); } + +private: + // the handle to DLL or NULL + wxDllType m_library; + + // no copy ctor/assignment operators (or we'd try to unload the library + // twice) + DECLARE_NO_COPY_CLASS(wxDynamicLibrary) }; -// --------------------------------------------------------------------------- +// ---------------------------------------------------------------------------- // wxLibrary +// ---------------------------------------------------------------------------- -class wxLibrary: public wxObject { -protected: - wxClassLibrary *m_liblist; - void *m_handle; +class WXDLLEXPORT wxLibrary : public wxObject +{ public: - wxLibrary(void *handle); - ~wxLibrary(void); + wxLibrary(wxDllType handle); + virtual ~wxLibrary(); + + // Get a symbol from the dynamic library + void *GetSymbol(const wxString& symbname); + + // Create the object whose classname is "name" + wxObject *CreateObject(const wxString& name); - // Get a symbol from the dynamic library - void *GetSymbol(const wxString& symbname); +protected: + void PrepareClasses(wxClassInfo *first); - // Create the object whose classname is "name" - wxObject *CreateObject(const wxString& name); + wxDllType m_handle; - wxClassLibrary *ClassLib() const; +public: + wxHashTable classTable; }; -// --------------------------------------------------------------------------- +// ---------------------------------------------------------------------------- // wxLibraries +// ---------------------------------------------------------------------------- -class wxLibraries { -protected: - wxList m_loaded; +class WXDLLEXPORT wxLibraries +{ public: - wxLibraries(void); - ~wxLibraries(void); + wxLibraries(); + ~wxLibraries(); - wxLibrary *LoadLibrary(const wxString& name); - wxObject *CreateObject(const wxString& name); + // caller is responsible for deleting the returned pointer if !NULL + wxLibrary *LoadLibrary(const wxString& basename); + + wxObject *CreateObject(const wxString& name); + +protected: + wxList m_loaded; }; -// --------------------------------------------------------------------------- +// ---------------------------------------------------------------------------- // Global variables +// ---------------------------------------------------------------------------- extern wxLibraries wxTheLibraries; -// --------------------------------------------------------------------------- +// ---------------------------------------------------------------------------- // Interesting defines +// ---------------------------------------------------------------------------- -#define WXDLL_ENTRY_FUNCTION() extern "C" wxClassLibrary *GetClassList() -#define WXDLL_EXIT_FUNCTION(param) extern "C" void FreeClassList(wxClassLibrary *param) +#define WXDLL_ENTRY_FUNCTION() \ +extern "C" wxClassInfo *wxGetClassFirst(); \ +wxClassInfo *wxGetClassFirst() { \ + return wxClassInfo::GetFirst(); \ +} -#endif +#endif // wxUSE_DYNLIB_CLASS + +#endif // _WX_DYNLIB_H__