408 lines
15 KiB
C++
408 lines
15 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/dynlib.h
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// Purpose: Dynamic library loading classes
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// Author: Guilhem Lavaux, Vadim Zeitlin, Vaclav Slavik
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// Modified by:
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// Created: 20/07/98
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// Copyright: (c) 1998 Guilhem Lavaux
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_DYNLIB_H__
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#define _WX_DYNLIB_H__
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#include "wx/defs.h"
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#if wxUSE_DYNLIB_CLASS
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#include "wx/string.h"
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#include "wx/dynarray.h"
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class WXDLLIMPEXP_FWD_BASE wxDynamicLibraryDetailsCreator;
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// ----------------------------------------------------------------------------
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// conditional compilation
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// ----------------------------------------------------------------------------
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#if defined(__WINDOWS__)
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typedef WXHMODULE wxDllType;
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#elif defined(HAVE_DLOPEN)
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#include <dlfcn.h>
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typedef void *wxDllType;
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#elif defined(__WXMAC__)
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#include <CodeFragments.h>
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typedef CFragConnectionID wxDllType;
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#else
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#error "Dynamic Loading classes can't be compiled on this platform, sorry."
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#endif
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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enum wxDLFlags
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{
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wxDL_LAZY = 0x00000001, // resolve undefined symbols at first use
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// (only works on some Unix versions)
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wxDL_NOW = 0x00000002, // resolve undefined symbols on load
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// (default, always the case under Win32)
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wxDL_GLOBAL = 0x00000004, // export extern symbols to subsequently
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// loaded libs.
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wxDL_VERBATIM = 0x00000008, // attempt to load the supplied library
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// name without appending the usual dll
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// filename extension.
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// this flag is obsolete, don't use
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wxDL_NOSHARE = 0x00000010, // load new DLL, don't reuse already loaded
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// (only for wxPluginManager)
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wxDL_QUIET = 0x00000020, // don't log an error if failed to load
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// this flag is dangerous, for internal use of wxMSW only, don't use at all
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// and especially don't use directly, use wxLoadedDLL instead if you really
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// do need it
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wxDL_GET_LOADED = 0x00000040, // Win32 only: return handle of already
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// loaded DLL or NULL otherwise; Unload()
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// should not be called so don't forget to
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// Detach() if you use this function
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wxDL_DEFAULT = wxDL_NOW // default flags correspond to Win32
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};
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enum wxDynamicLibraryCategory
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{
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wxDL_LIBRARY, // standard library
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wxDL_MODULE // loadable module/plugin
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};
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enum wxPluginCategory
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{
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wxDL_PLUGIN_GUI, // plugin that uses GUI classes
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wxDL_PLUGIN_BASE // wxBase-only plugin
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};
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// ----------------------------------------------------------------------------
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// macros
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// ----------------------------------------------------------------------------
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// when loading a function from a DLL you always have to cast the returned
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// "void *" pointer to the correct type and, even more annoyingly, you have to
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// repeat this type twice if you want to declare and define a function pointer
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// all in one line
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//
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// this macro makes this slightly less painful by allowing you to specify the
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// type only once, as the first parameter, and creating a variable of this type
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// called "pfn<name>" initialized with the "name" from the "dynlib"
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#define wxDYNLIB_FUNCTION(type, name, dynlib) \
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type pfn ## name = (type)(dynlib).GetSymbol(wxT(#name))
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// a more convenient function replacing wxDYNLIB_FUNCTION above
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//
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// it uses the convention that the type of the function is its name suffixed
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// with "_t" but it doesn't define a variable but just assigns the loaded value
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// to it and also allows to pass it the prefix to be used instead of hardcoding
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// "pfn" (the prefix can be "m_" or "gs_pfn" or whatever)
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//
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// notice that this function doesn't generate error messages if the symbol
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// couldn't be loaded, the caller should generate the appropriate message
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#define wxDL_INIT_FUNC(pfx, name, dynlib) \
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pfx ## name = (name ## _t)(dynlib).RawGetSymbol(#name)
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#ifdef __WINDOWS__
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// same as wxDL_INIT_FUNC() but appends 'A' or 'W' to the function name, see
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// wxDynamicLibrary::GetSymbolAorW()
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#define wxDL_INIT_FUNC_AW(pfx, name, dynlib) \
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pfx ## name = (name ## _t)(dynlib).GetSymbolAorW(#name)
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#endif // __WINDOWS__
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// the following macros can be used to redirect a whole library to a class and
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// check at run-time if the library is present and contains all required
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// methods
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//
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// notice that they are supposed to be used inside a class which has "m_ok"
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// member variable indicating if the library had been successfully loaded
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// helper macros constructing the name of the variable storing the function
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// pointer and the name of its type from the function name
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#define wxDL_METHOD_NAME(name) m_pfn ## name
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#define wxDL_METHOD_TYPE(name) name ## _t
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// parameters are:
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// - rettype: return type of the function, e.g. "int"
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// - name: name of the function, e.g. "foo"
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// - args: function signature in parentheses, e.g. "(int x, int y)"
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// - argnames: the names of the parameters in parentheses, e.g. "(x, y)"
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// - defret: the value to return if the library wasn't successfully loaded
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#define wxDL_METHOD_DEFINE( rettype, name, args, argnames, defret ) \
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typedef rettype (* wxDL_METHOD_TYPE(name)) args ; \
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wxDL_METHOD_TYPE(name) wxDL_METHOD_NAME(name); \
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rettype name args \
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{ return m_ok ? wxDL_METHOD_NAME(name) argnames : defret; }
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#define wxDL_VOIDMETHOD_DEFINE( name, args, argnames ) \
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typedef void (* wxDL_METHOD_TYPE(name)) args ; \
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wxDL_METHOD_TYPE(name) wxDL_METHOD_NAME(name); \
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void name args \
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{ if ( m_ok ) wxDL_METHOD_NAME(name) argnames ; }
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#define wxDL_METHOD_LOAD(lib, name) \
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wxDL_METHOD_NAME(name) = \
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(wxDL_METHOD_TYPE(name)) lib.GetSymbol(#name, &m_ok); \
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if ( !m_ok ) return false
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// ----------------------------------------------------------------------------
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// wxDynamicLibraryDetails: contains details about a loaded wxDynamicLibrary
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxDynamicLibraryDetails
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{
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public:
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// ctor, normally never used as these objects are only created by
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// wxDynamicLibrary::ListLoaded()
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wxDynamicLibraryDetails() { m_address = NULL; m_length = 0; }
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// get the (base) name
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wxString GetName() const { return m_name; }
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// get the full path of this object
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wxString GetPath() const { return m_path; }
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// get the load address and the extent, return true if this information is
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// available
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bool GetAddress(void **addr, size_t *len) const
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{
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if ( !m_address )
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return false;
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if ( addr )
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*addr = m_address;
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if ( len )
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*len = m_length;
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return true;
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}
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// return the version of the DLL (may be empty if no version info)
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wxString GetVersion() const
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{
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return m_version;
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}
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private:
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wxString m_name,
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m_path,
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m_version;
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void *m_address;
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size_t m_length;
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friend class wxDynamicLibraryDetailsCreator;
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};
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WX_DECLARE_USER_EXPORTED_OBJARRAY(wxDynamicLibraryDetails,
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wxDynamicLibraryDetailsArray,
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WXDLLIMPEXP_BASE);
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// ----------------------------------------------------------------------------
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// wxDynamicLibrary: represents a handle to a DLL/shared object
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxDynamicLibrary
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{
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public:
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// return a valid handle for the main program itself or NULL if back
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// linking is not supported by the current platform (e.g. Win32)
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static wxDllType GetProgramHandle();
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// return the platform standard DLL extension (with leading dot)
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static wxString GetDllExt(wxDynamicLibraryCategory cat = wxDL_LIBRARY);
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wxDynamicLibrary() : m_handle(NULL) { }
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wxDynamicLibrary(const wxString& libname, int flags = wxDL_DEFAULT)
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: m_handle(NULL)
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{
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Load(libname, flags);
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}
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// NOTE: this class is (deliberately) not virtual, do not attempt
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// to use it polymorphically.
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~wxDynamicLibrary() { Unload(); }
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// return true if the library was loaded successfully
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bool IsLoaded() const { return m_handle != NULL; }
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// load the library with the given name (full or not), return true if ok
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bool Load(const wxString& libname, int flags = wxDL_DEFAULT);
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// raw function for loading dynamic libs: always behaves as if
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// wxDL_VERBATIM were specified and doesn't log error message if the
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// library couldn't be loaded but simply returns NULL
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static wxDllType RawLoad(const wxString& libname, int flags = wxDL_DEFAULT);
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// attach to an existing handle
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void Attach(wxDllType h) { Unload(); m_handle = h; }
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// detach the library object from its handle, i.e. prevent the object from
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// unloading the library in its dtor -- the caller is now responsible for
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// doing this
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wxDllType Detach() { wxDllType h = m_handle; m_handle = NULL; return h; }
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// unload the given library handle (presumably returned by Detach() before)
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static void Unload(wxDllType handle);
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// unload the library, also done automatically in dtor
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void Unload() { if ( IsLoaded() ) { Unload(m_handle); m_handle = NULL; } }
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// Return the raw handle from dlopen and friends.
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wxDllType GetLibHandle() const { return m_handle; }
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// check if the given symbol is present in the library, useful to verify if
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// a loadable module is our plugin, for example, without provoking error
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// messages from GetSymbol()
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bool HasSymbol(const wxString& name) const
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{
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bool ok;
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DoGetSymbol(name, &ok);
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return ok;
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}
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// resolve a symbol in a loaded DLL, such as a variable or function name.
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// 'name' is the (possibly mangled) name of the symbol. (use extern "C" to
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// export unmangled names)
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//
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// Since it is perfectly valid for the returned symbol to actually be NULL,
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// that is not always indication of an error. Pass and test the parameter
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// 'success' for a true indication of success or failure to load the
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// symbol.
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//
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// Returns a pointer to the symbol on success, or NULL if an error occurred
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// or the symbol wasn't found.
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void *GetSymbol(const wxString& name, bool *success = NULL) const;
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// low-level version of GetSymbol()
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static void *RawGetSymbol(wxDllType handle, const wxString& name);
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void *RawGetSymbol(const wxString& name) const
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{
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return RawGetSymbol(m_handle, name);
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}
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#ifdef __WINDOWS__
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// this function is useful for loading functions from the standard Windows
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// DLLs: such functions have an 'A' (in ANSI build) or 'W' (in Unicode, or
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// wide character build) suffix if they take string parameters
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static void *RawGetSymbolAorW(wxDllType handle, const wxString& name)
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{
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return RawGetSymbol
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(
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handle,
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name +
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#if wxUSE_UNICODE
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L'W'
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#else
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'A'
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#endif
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);
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}
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void *GetSymbolAorW(const wxString& name) const
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{
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return RawGetSymbolAorW(m_handle, name);
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}
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#endif // __WINDOWS__
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// return all modules/shared libraries in the address space of this process
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//
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// returns an empty array if not implemented or an error occurred
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static wxDynamicLibraryDetailsArray ListLoaded();
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// return platform-specific name of dynamic library with proper extension
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// and prefix (e.g. "foo.dll" on Windows or "libfoo.so" on Linux)
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static wxString CanonicalizeName(const wxString& name,
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wxDynamicLibraryCategory cat = wxDL_LIBRARY);
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// return name of wxWidgets plugin (adds compiler and version info
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// to the filename):
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static wxString
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CanonicalizePluginName(const wxString& name,
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wxPluginCategory cat = wxDL_PLUGIN_GUI);
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// return plugin directory on platforms where it makes sense and empty
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// string on others:
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static wxString GetPluginsDirectory();
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// Return the load address of the module containing the given address or
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// NULL if not found.
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//
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// If path output parameter is non-NULL, fill it with the full path to this
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// module disk file on success.
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static void* GetModuleFromAddress(const void* addr, wxString* path = NULL);
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#ifdef __WINDOWS__
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// return the handle (HMODULE/HINSTANCE) of the DLL with the given name
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// and/or containing the specified address: for XP and later systems only
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// the address is used and the name is ignored but for the previous systems
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// only the name (which may be either a full path to the DLL or just its
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// base name, possibly even without extension) is used
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//
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// the returned handle reference count is not incremented so it doesn't
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// need to be freed using FreeLibrary() but it also means that it can
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// become invalid if the DLL is unloaded
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static WXHMODULE MSWGetModuleHandle(const wxString& name, void *addr);
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#endif // __WINDOWS__
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protected:
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// common part of GetSymbol() and HasSymbol()
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void* DoGetSymbol(const wxString& name, bool* success = NULL) const;
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// log the error after an OS dynamic library function failure
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static void ReportError(const wxString& msg,
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const wxString& name = wxString());
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// the handle to DLL or NULL
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wxDllType m_handle;
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// no copy ctor/assignment operators (or we'd try to unload the library
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// twice)
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wxDECLARE_NO_COPY_CLASS(wxDynamicLibrary);
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};
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#ifdef __WINDOWS__
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// ----------------------------------------------------------------------------
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// wxLoadedDLL is a MSW-only internal helper class allowing to dynamically bind
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// to a DLL already loaded into the project address space
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// ----------------------------------------------------------------------------
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class wxLoadedDLL : public wxDynamicLibrary
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{
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public:
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wxLoadedDLL(const wxString& dllname)
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: wxDynamicLibrary(dllname, wxDL_GET_LOADED | wxDL_VERBATIM | wxDL_QUIET)
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{
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}
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~wxLoadedDLL()
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{
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Detach();
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}
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};
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#endif // __WINDOWS__
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// ----------------------------------------------------------------------------
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// Interesting defines
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// ----------------------------------------------------------------------------
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#define WXDLL_ENTRY_FUNCTION() \
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extern "C" WXEXPORT const wxClassInfo *wxGetClassFirst(); \
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const wxClassInfo *wxGetClassFirst() { \
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return wxClassInfo::GetFirst(); \
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}
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#endif // wxUSE_DYNLIB_CLASS
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#endif // _WX_DYNLIB_H__
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