/////////////////////////////////////////////////////////////////////////////
-// 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
-// Licence: wxWindows license
+// Copyright: (c) 1998 Guilhem Lavaux
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_DYNLIB_H__
#define _WX_DYNLIB_H__
-#ifdef __GNUG__
- #pragma interface
-#endif
+#include "wx/defs.h"
-#include <wx/string.h>
-#include <wx/list.h>
-#include <wx/hash.h>
+#if wxUSE_DYNLIB_CLASS
-#if defined(HAVE_DLOPEN)
- #include <dlfcn.h>
+#include "wx/string.h"
+#include "wx/dynarray.h"
- typedef void *wxDllType;
-#elif defined(HAVE_SHLLOAD)
- #include <dl.h>
+// note that we have our own dlerror() implementation under Darwin
+#if (defined(HAVE_DLERROR) && !defined(__EMX__)) || defined(__DARWIN__)
+ #define wxHAVE_DYNLIB_ERROR
+#endif
- typedef void *wxDllType;
-#elif defined(__WINDOWS__)
- #include <windows.h>
+class WXDLLIMPEXP_FWD_BASE wxDynamicLibraryDetailsCreator;
- typedef HMODULE wxDllType;
+// ----------------------------------------------------------------------------
+// conditional compilation
+// ----------------------------------------------------------------------------
+
+// Note: __OS2__/EMX has to be tested first, since we want to use
+// native version, even if configure detected presence of DLOPEN.
+#if defined(__OS2__) || defined(__EMX__) || defined(__WINDOWS__)
+ typedef WXHMODULE wxDllType;
+#elif defined(__DARWIN__)
+ // Don't include dlfcn.h on Darwin, we may be using our own replacements.
+ typedef void *wxDllType;
+#elif defined(HAVE_DLOPEN)
+ #include <dlfcn.h>
+ typedef void *wxDllType;
+#elif defined(HAVE_SHL_LOAD)
+ #include <dl.h>
+ typedef shl_t wxDllType;
#elif defined(__WXMAC__)
- typedef CFragConnectionID wxDllType;
+ #include <CodeFragments.h>
+ typedef CFragConnectionID wxDllType;
#else
- #error "wxLibrary can't be compiled on this platform, sorry."
-#endif // OS
-
-// defined in windows.h
-#ifdef LoadLibrary
- #undef LoadLibrary
+ #error "Dynamic Loading classes can't be compiled on this platform, sorry."
#endif
// ----------------------------------------------------------------------------
-// wxLibrary
+// constants
// ----------------------------------------------------------------------------
-class wxLibrary : public wxObject
+enum wxDLFlags
{
-public:
- wxHashTable classTable;
+ wxDL_LAZY = 0x00000001, // resolve undefined symbols at first use
+ // (only works on some Unix versions)
+ wxDL_NOW = 0x00000002, // resolve undefined symbols on load
+ // (default, always the case under Win32)
+ 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.
+
+ // this flag is obsolete, don't use
+ wxDL_NOSHARE = 0x00000010, // load new DLL, don't reuse already loaded
+ // (only for wxPluginManager)
+
+ wxDL_QUIET = 0x00000020, // don't log an error if failed to load
+
+ // this flag is dangerous, for internal use of wxMSW only, don't use at all
+ // and especially don't use directly, use wxLoadedDLL instead if you really
+ // do need it
+ wxDL_GET_LOADED = 0x00000040, // Win32 only: return handle of already
+ // loaded DLL or NULL otherwise; Unload()
+ // should not be called so don't forget to
+ // Detach() if you use this function
+
+ wxDL_DEFAULT = wxDL_NOW // default flags correspond to Win32
+};
+
+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<name>" initialized with the "name" from the "dynlib"
+#define wxDYNLIB_FUNCTION(type, name, dynlib) \
+ type pfn ## name = (type)(dynlib).GetSymbol(wxT(#name))
+
+
+// a more convenient function replacing wxDYNLIB_FUNCTION above
+//
+// it uses the convention that the type of the function is its name suffixed
+// with "_t" but it doesn't define a variable but just assigns the loaded value
+// to it and also allows to pass it the prefix to be used instead of hardcoding
+// "pfn" (the prefix can be "m_" or "gs_pfn" or whatever)
+//
+// notice that this function doesn't generate error messages if the symbol
+// couldn't be loaded, the caller should generate the appropriate message
+#define wxDL_INIT_FUNC(pfx, name, dynlib) \
+ pfx ## name = (name ## _t)(dynlib).RawGetSymbol(#name)
+
+#ifdef __WINDOWS__
+
+// same as wxDL_INIT_FUNC() but appends 'A' or 'W' to the function name, see
+// wxDynamicLibrary::GetSymbolAorW()
+#define wxDL_INIT_FUNC_AW(pfx, name, dynlib) \
+ pfx ## name = (name ## _t)(dynlib).GetSymbolAorW(#name)
+
+#endif // __WINDOWS__
+
+// the following macros can be used to redirect a whole library to a class and
+// check at run-time if the library is present and contains all required
+// methods
+//
+// notice that they are supposed to be used inside a class which has "m_ok"
+// member variable indicating if the library had been successfully loaded
+// helper macros constructing the name of the variable storing the function
+// pointer and the name of its type from the function name
+#define wxDL_METHOD_NAME(name) m_pfn ## name
+#define wxDL_METHOD_TYPE(name) name ## _t
+
+// parameters are:
+// - rettype: return type of the function, e.g. "int"
+// - name: name of the function, e.g. "foo"
+// - args: function signature in parentheses, e.g. "(int x, int y)"
+// - argnames: the names of the parameters in parentheses, e.g. "(x, y)"
+// - defret: the value to return if the library wasn't successfully loaded
+#define wxDL_METHOD_DEFINE( rettype, name, args, argnames, defret ) \
+ typedef rettype (* wxDL_METHOD_TYPE(name)) args ; \
+ wxDL_METHOD_TYPE(name) wxDL_METHOD_NAME(name); \
+ rettype name args \
+ { return m_ok ? wxDL_METHOD_NAME(name) argnames : defret; }
+
+#define wxDL_VOIDMETHOD_DEFINE( name, args, argnames ) \
+ typedef void (* wxDL_METHOD_TYPE(name)) args ; \
+ wxDL_METHOD_TYPE(name) wxDL_METHOD_NAME(name); \
+ void name args \
+ { if ( m_ok ) wxDL_METHOD_NAME(name) argnames ; }
+
+#define wxDL_METHOD_LOAD(lib, name) \
+ wxDL_METHOD_NAME(name) = \
+ (wxDL_METHOD_TYPE(name)) lib.GetSymbol(#name, &m_ok); \
+ if ( !m_ok ) return false
+
+// ----------------------------------------------------------------------------
+// wxDynamicLibraryDetails: contains details about a loaded wxDynamicLibrary
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxDynamicLibraryDetails
+{
public:
- wxLibrary(void *handle);
- ~wxLibrary();
+ // ctor, normally never used as these objects are only created by
+ // wxDynamicLibrary::ListLoaded()
+ wxDynamicLibraryDetails() { m_address = NULL; m_length = 0; }
- // Get a symbol from the dynamic library
- void *GetSymbol(const wxString& symbname);
+ // get the (base) name
+ wxString GetName() const { return m_name; }
- // Create the object whose classname is "name"
- wxObject *CreateObject(const wxString& name);
+ // get the full path of this object
+ wxString GetPath() const { return m_path; }
-protected:
- void PrepareClasses(wxClassInfo *first);
+ // get the load address and the extent, return true if this information is
+ // available
+ bool GetAddress(void **addr, size_t *len) const
+ {
+ if ( !m_address )
+ return false;
- wxDllType m_handle;
+ if ( addr )
+ *addr = m_address;
+ if ( len )
+ *len = m_length;
+
+ return true;
+ }
+
+ // return the version of the DLL (may be empty if no version info)
+ wxString GetVersion() const
+ {
+ return m_version;
+ }
+
+private:
+ wxString m_name,
+ m_path,
+ m_version;
+
+ void *m_address;
+ size_t m_length;
+
+ friend class wxDynamicLibraryDetailsCreator;
};
+WX_DECLARE_USER_EXPORTED_OBJARRAY(wxDynamicLibraryDetails,
+ wxDynamicLibraryDetailsArray,
+ WXDLLIMPEXP_BASE);
+
// ----------------------------------------------------------------------------
-// wxLibraries
+// wxDynamicLibrary: represents a handle to a DLL/shared object
// ----------------------------------------------------------------------------
-class wxLibraries
+class WXDLLIMPEXP_BASE wxDynamicLibrary
{
public:
- wxLibraries();
- ~wxLibraries();
+ // 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 wxString& 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(const wxString& libname, int flags = wxDL_DEFAULT);
+
+ // raw function for loading dynamic libs: always behaves as if
+ // wxDL_VERBATIM were specified and doesn't log error message if the
+ // library couldn't be loaded but simply returns NULL
+ static wxDllType RawLoad(const 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 = NULL) const;
+
+ // low-level version of GetSymbol()
+ static void *RawGetSymbol(wxDllType handle, const wxString& name);
+ void *RawGetSymbol(const wxString& name) const
+ {
+#if defined (__WXPM__) || defined(__EMX__)
+ return GetSymbol(name);
+#else
+ return RawGetSymbol(m_handle, name);
+#endif
+ }
- // caller is responsible for deleting the returned pointer if !NULL
- wxLibrary *LoadLibrary(const wxString& basename);
+#ifdef __WINDOWS__
+ // this function is useful for loading functions from the standard Windows
+ // DLLs: such functions have an 'A' (in ANSI build) or 'W' (in Unicode, or
+ // wide character build) suffix if they take string parameters
+ static void *RawGetSymbolAorW(wxDllType handle, const wxString& name)
+ {
+ return RawGetSymbol
+ (
+ handle,
+ name +
+#if wxUSE_UNICODE
+ L'W'
+#else
+ 'A'
+#endif
+ );
+ }
+
+ void *GetSymbolAorW(const wxString& name) const
+ {
+ return RawGetSymbolAorW(m_handle, name);
+ }
+#endif // __WINDOWS__
+
+ // return all modules/shared libraries in the address space of this process
+ //
+ // returns an empty array if not implemented or an error occurred
+ static wxDynamicLibraryDetailsArray ListLoaded();
+
+ // 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);
- wxObject *CreateObject(const wxString& name);
+ // return plugin directory on platforms where it makes sense and empty
+ // string on others:
+ static wxString GetPluginsDirectory();
+
+
+#ifdef __WINDOWS__
+ // return the handle (HMODULE/HINSTANCE) of the DLL with the given name
+ // and/or containing the specified address: for XP and later systems only
+ // the address is used and the name is ignored but for the previous systems
+ // only the name (which may be either a full path to the DLL or just its
+ // base name, possibly even without extension) is used
+ //
+ // the returned handle reference count is not incremented so it doesn't
+ // need to be freed using FreeLibrary() but it also means that it can
+ // become invalid if the DLL is unloaded
+ static WXHMODULE MSWGetModuleHandle(const char *name, void *addr);
+#endif // __WINDOWS__
protected:
- wxList m_loaded;
+ // common part of GetSymbol() and HasSymbol()
+ void *DoGetSymbol(const wxString& name, bool *success = 0) const;
+
+#ifdef wxHAVE_DYNLIB_ERROR
+ // log the error after a dlxxx() function failure
+ static void Error();
+#endif // wxHAVE_DYNLIB_ERROR
+
+
+ // platform specific shared lib suffix.
+ static const wxString 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)
+ wxDECLARE_NO_COPY_CLASS(wxDynamicLibrary);
};
+#ifdef __WINDOWS__
+
// ----------------------------------------------------------------------------
-// Global variables
+// wxLoadedDLL is a MSW-only internal helper class allowing to dynamically bind
+// to a DLL already loaded into the project address space
// ----------------------------------------------------------------------------
-extern wxLibraries wxTheLibraries;
+class wxLoadedDLL : public wxDynamicLibrary
+{
+public:
+ wxLoadedDLL(const wxString& dllname)
+ : wxDynamicLibrary(dllname, wxDL_GET_LOADED | wxDL_VERBATIM | wxDL_QUIET)
+ {
+ }
+
+ ~wxLoadedDLL()
+ {
+ Detach();
+ }
+};
+
+#endif // __WINDOWS__
// ----------------------------------------------------------------------------
// Interesting defines
// ----------------------------------------------------------------------------
#define WXDLL_ENTRY_FUNCTION() \
-extern "C" wxClassInfo *wxGetClassFirst(); \
-wxClassInfo *wxGetClassFirst() { \
+extern "C" WXEXPORT const wxClassInfo *wxGetClassFirst(); \
+const wxClassInfo *wxGetClassFirst() { \
return wxClassInfo::GetFirst(); \
}
+#endif // wxUSE_DYNLIB_CLASS
+
#endif // _WX_DYNLIB_H__
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