X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8a0d4cf6c5e9fe357ca3e873b81c0fda10e4b217..69429a166f8b168228bbb89eb8c52903670f4fd2:/include/wx/dynlib.h diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h index 98bc1839a6..6dd60bf12f 100644 --- a/include/wx/dynlib.h +++ b/include/wx/dynlib.h @@ -1,73 +1,195 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: dynlib.cpp -// Purpose: Dynamic library management -// Author: Guilhem Lavaux +// 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) Guilhem Lavaux +// Copyright: (c) 1998 Guilhem Lavaux // Licence: wxWindows license ///////////////////////////////////////////////////////////////////////////// #ifndef _WX_DYNLIB_H__ #define _WX_DYNLIB_H__ -#ifdef __GNUG__ - #pragma interface +#if defined(__GNUG__) && !defined(__APPLE__) +# pragma interface "dynlib.h" #endif -#include +#include "wx/setup.h" -#if wxUSE_DYNLIB_CLASS +#if wxUSE_DYNAMIC_LOADER -#include -#include -#include +#include "wx/dynload.h" // Use the new (version of) wxDynamicLibrary instead + +#elif 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 +# 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 -#if defined(HAVE_DLOPEN) - #include - +// 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 - +# include typedef shl_t wxDllType; #elif defined(__WINDOWS__) - #include - +# include // needed to get HMODULE typedef HMODULE wxDllType; +#elif defined(__DARWIN__) + typedef void *wxDllType; #elif defined(__WXMAC__) - typedef CFragConnectionID wxDllType; + typedef void *wxDllType; #else - #error "wxLibrary can't be compiled on this platform, sorry." +# error "wxLibrary can't be compiled on this platform, sorry." #endif // OS -// defined in windows.h -#ifdef LoadLibrary - #undef LoadLibrary +// 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 // ---------------------------------------------------------------------------- -// wxLibrary +// wxDllLoader: low level DLL functions, use wxDynamicLibrary in your code // ---------------------------------------------------------------------------- -class wxLibrary : public wxObject +/* + 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: - wxHashTable classTable; + /* + 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 = 0); + + /* + 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, + bool *success = NULL); + + // return the standard DLL extension (with leading dot) for this platform + static const wxString &GetDllExt() { return ms_dllext; } + +private: + // forbid construction of objects + wxDllLoader(); + static const wxString ms_dllext; +}; + +// ---------------------------------------------------------------------------- +// wxDynamicLibrary - friendly interface to wxDllLoader +// ---------------------------------------------------------------------------- +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 WXDLLEXPORT wxLibrary : public wxObject +{ public: wxLibrary(wxDllType handle); - ~wxLibrary(); + virtual ~wxLibrary(); // Get a symbol from the dynamic library void *GetSymbol(const wxString& symbname); @@ -79,13 +201,16 @@ protected: void PrepareClasses(wxClassInfo *first); wxDllType m_handle; + +public: + wxHashTable classTable; }; // ---------------------------------------------------------------------------- // wxLibraries // ---------------------------------------------------------------------------- -class wxLibraries +class WXDLLEXPORT wxLibraries { public: wxLibraries(); @@ -104,15 +229,15 @@ protected: // Global variables // ---------------------------------------------------------------------------- -extern wxLibraries wxTheLibraries; +extern WXDLLEXPORT_DATA(wxLibraries) wxTheLibraries; // ---------------------------------------------------------------------------- // Interesting defines // ---------------------------------------------------------------------------- #define WXDLL_ENTRY_FUNCTION() \ -extern "C" wxClassInfo *wxGetClassFirst(); \ -wxClassInfo *wxGetClassFirst() { \ +extern "C" WXEXPORT const wxClassInfo *wxGetClassFirst(); \ +const wxClassInfo *wxGetClassFirst() { \ return wxClassInfo::GetFirst(); \ }