X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/0c32066b58849e52e4d76e30982414d9f4daae6a..c096ba5ea1c7536e00d8eb6bcad3f0a4a6edb13e:/include/wx/dynlib.h?ds=sidebyside diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h index 39db5aa6ad..e163ae2098 100644 --- a/include/wx/dynlib.h +++ b/include/wx/dynlib.h @@ -1,73 +1,341 @@ +///////////////////////////////////////////////////////////////////////////// +// 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 licence +///////////////////////////////////////////////////////////////////////////// + #ifndef _WX_DYNLIB_H__ #define _WX_DYNLIB_H__ -#ifdef __GNUG__ -#pragma interface +#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) +# pragma interface "dynlib.h" +#endif + +#include "wx/setup.h" + +#if wxUSE_DYNLIB_CLASS + +#include "wx/string.h" + +// FIXME: can this go in private.h or something too?? +#if defined(__WXPM__) || defined(__EMX__) +#define INCL_DOS +#include +#endif + +#ifdef __WXMSW__ +#include "wx/msw/private.h" +#endif + +// ---------------------------------------------------------------------------- +// conditional compilation +// ---------------------------------------------------------------------------- + +// 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__) || defined(__WINDOWS__) + typedef HMODULE wxDllType; +#elif defined(HAVE_DLOPEN) + #include + typedef void *wxDllType; +#elif defined(HAVE_SHL_LOAD) + #include + typedef shl_t wxDllType; +#elif defined(__DARWIN__) + typedef void *wxDllType; +#elif defined(__WXMAC__) + #include + typedef CFragConnectionID wxDllType; +#else + #error "Dynamic Loading classes can't be compiled on this platform, sorry." #endif -#include -#include -#include -#include +// ---------------------------------------------------------------------------- +// constants +// ---------------------------------------------------------------------------- + +enum wxDLFlags +{ + wxDL_LAZY = 0x00000001, // resolve undefined symbols at first use + wxDL_NOW = 0x00000002, // resolve undefined symbols on load + wxDL_GLOBAL = 0x00000004, // export extern symbols to subsequently + // loaded libs. + wxDL_VERBATIM = 0x00000008, // Attempt to load the supplied library + // name without appending the usual dll + // filename extension. -#ifdef LoadLibrary -#undef LoadLibrary + wxDL_NOSHARE = 0x00000010, // load new DLL, don't reuse already loaded + + // FIXME: why? (VZ) +#ifdef __osf__ + wxDL_DEFAULT = wxDL_LAZY +#else + wxDL_DEFAULT = wxDL_LAZY | wxDL_GLOBAL #endif +}; + +enum wxDynamicLibraryCategory +{ + wxDL_LIBRARY, // standard library + wxDL_MODULE // loadable module/plugin +}; + +enum wxPluginCategory +{ + wxDL_PLUGIN_GUI, // plugin that uses GUI classes + wxDL_PLUGIN_BASE // wxBase-only plugin +}; +// ---------------------------------------------------------------------------- +// macros +// ---------------------------------------------------------------------------- + +// when loading a function from a DLL you always have to cast the returned +// "void *" pointer to the correct type and, even more annoyingly, you have to +// repeat this type twice if you want to declare and define a function pointer +// all in one line +// +// this macro makes this slightly less painful by allowing you to specify the +// type only once, as the first parameter, and creating a variable of this type +// called "pfn" initialized with the "name" from the "dynlib" +#define wxDYNLIB_FUNCTION(type, name, dynlib) \ + type pfn ## name = (type)(dynlib).GetSymbol(_T(#name)) + +// --------------------------------------------------------------------------- +// wxDynamicLibrary // --------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE wxDynamicLibrary +{ +public: + // return 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(); + + // return the platform standard DLL extension (with leading dot) + static const wxChar *GetDllExt() { return ms_dllext; } + + wxDynamicLibrary() : m_handle(0) { } + wxDynamicLibrary(const wxString& libname, int flags = wxDL_DEFAULT) + : m_handle(0) + { + Load(libname, flags); + } + + // NOTE: this class is (deliberately) not virtual, do not attempt + // to use it polymorphically. + ~wxDynamicLibrary() { Unload(); } + + // return true if the library was loaded successfully + bool IsLoaded() const { return m_handle != 0; } + + // load the library with the given name (full or not), return true if ok + bool Load(wxString libname, int flags = wxDL_DEFAULT); + + // detach the library object from its handle, i.e. prevent the object from + // unloading the library in its dtor -- the caller is now responsible for + // doing this + wxDllType Detach() { wxDllType h = m_handle; m_handle = 0; return h; } + + // unload the given library handle (presumably returned by Detach() before) + static void Unload(wxDllType handle); + + // unload the library, also done automatically in dtor + void Unload() { if ( IsLoaded() ) { Unload(m_handle); m_handle = 0; } } + + // Return the raw handle from dlopen and friends. + wxDllType GetLibHandle() const { return m_handle; } + + // check if the given symbol is present in the library, useful to verify if + // a loadable module is our plugin, for example, without provoking error + // messages from GetSymbol() + bool HasSymbol(const wxString& name) const + { + bool ok; + DoGetSymbol(name, &ok); + return ok; + } + + // resolve a symbol in a loaded DLL, such as a variable or function name. + // 'name' is the (possibly mangled) name of the symbol. (use extern "C" to + // export unmangled names) + // + // Since it is perfectly valid for the returned symbol to actually be NULL, + // that is not always indication of an error. Pass and test the parameter + // 'success' for a true indication of success or failure to load the + // symbol. + // + // Returns a pointer to the symbol on success, or NULL if an error occurred + // or the symbol wasn't found. + void *GetSymbol(const wxString& name, bool *success = 0) const; + + + // return platform-specific name of dynamic library with proper extension + // and prefix (e.g. "foo.dll" on Windows or "libfoo.so" on Linux) + static wxString CanonicalizeName(const wxString& name, + wxDynamicLibraryCategory cat = wxDL_LIBRARY); + + // return name of wxWidgets plugin (adds compiler and version info + // to the filename): + static wxString + CanonicalizePluginName(const wxString& name, + wxPluginCategory cat = wxDL_PLUGIN_GUI); + + // return plugin directory on platforms where it makes sense and empty + // string on others: + static wxString GetPluginsDirectory(); + + +#if WXWIN_COMPATIBILITY_2_2 + operator bool() const { return IsLoaded(); } +#endif + +protected: + // the real implementation of GetSymbol() + void *DoGetSymbol(const wxString& name, bool *success = 0) const; + + + // platform specific shared lib suffix. + static const wxChar *ms_dllext; + + // the handle to DLL or NULL + wxDllType m_handle; + + // no copy ctor/assignment operators (or we'd try to unload the library + // twice) + DECLARE_NO_COPY_CLASS(wxDynamicLibrary) +}; + + +// ---------------------------------------------------------------------------- +// wxDllLoader: low level DLL functions, use wxDynamicLibrary in your code +// ---------------------------------------------------------------------------- + +#if WXWIN_COMPATIBILITY_2_2 && wxUSE_DYNAMIC_LOADER + +/* + 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 WXDLLIMPEXP_BASE wxDllLoader +{ +public: + /* + 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& name, 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() { return wxDynamicLibrary::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 = 0); + + // return the standard DLL extension (with leading dot) for this platform + static wxString GetDllExt() { return wxDynamicLibrary::GetDllExt(); } + +private: + + wxDllLoader(); // forbid construction of objects +}; + + +// ---------------------------------------------------------------------------- // wxLibrary +// ---------------------------------------------------------------------------- -class wxLibrary: public wxObject { - protected: - void *m_handle; - bool m_destroy; - public: - wxHashTable classTable; +#include "wx/hash.h" - public: - wxLibrary(void *handle); - ~wxLibrary(void); +class WXDLLIMPEXP_BASE wxLibrary : public wxObject +{ +public: + wxLibrary(wxDllType handle); + virtual ~wxLibrary(); - // Get a symbol from the dynamic library - void *GetSymbol(const wxString& symbname); + // Get a symbol from the dynamic library + void *GetSymbol(const wxString& symbname); - // Create the object whose classname is "name" - wxObject *CreateObject(const wxString& name); + // Create the object whose classname is "name" + wxObject *CreateObject(const wxString& name); - // Merge the symbols with the main symbols: WARNING! the library will not - // be unloaded. - void MergeWithSystem(); +protected: + void PrepareClasses(wxClassInfo *first); - protected: - void PrepareClasses(wxClassInfo **first); + wxDllType m_handle; + +public: + wxHashTable classTable; }; -// --------------------------------------------------------------------------- +// ---------------------------------------------------------------------------- // wxLibraries +// ---------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE wxLibraries +{ +public: + wxLibraries(); + ~wxLibraries(); -class wxLibraries { - protected: - wxList m_loaded; - public: - wxLibraries(void); - ~wxLibraries(void); + // caller is responsible for deleting the returned pointer if !NULL + wxLibrary *LoadLibrary(const wxString& basename); - wxLibrary *LoadLibrary(const wxString& name); - wxObject *CreateObject(const wxString& name); + wxObject *CreateObject(const wxString& name); + +protected: + wxList m_loaded; }; -// --------------------------------------------------------------------------- +// ---------------------------------------------------------------------------- // Global variables +// ---------------------------------------------------------------------------- -extern wxLibraries wxTheLibraries; +extern WXDLLIMPEXP_DATA_BASE(wxLibraries) wxTheLibraries; -// --------------------------------------------------------------------------- +#endif // WXWIN_COMPATIBILITY_2_2 && wxUSE_DYNAMIC_LOADER + +// ---------------------------------------------------------------------------- // Interesting defines +// ---------------------------------------------------------------------------- #define WXDLL_ENTRY_FUNCTION() \ -extern "C" wxClassInfo **wxGetClassFirst(); \ -wxClassInfo **wxGetClassFirst() { \ - return &wxClassInfo::first; \ +extern "C" WXEXPORT const wxClassInfo *wxGetClassFirst(); \ +const wxClassInfo *wxGetClassFirst() { \ + return wxClassInfo::GetFirst(); \ } -#endif +#endif // wxUSE_DYNLIB_CLASS + +#endif // _WX_DYNLIB_H__