// 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__
-#if defined(__GNUG__) && !defined(__APPLE__)
-# pragma interface "dynlib.h"
-#endif
-
-#include "wx/setup.h"
+#include "wx/defs.h"
#if wxUSE_DYNLIB_CLASS
#include "wx/string.h"
+#include "wx/dynarray.h"
-// FIXME: can this go in private.h or something too??
-#if defined(__WXPM__) || defined(__EMX__)
-#define INCL_DOS
-#include <os2.h>
+// note that we have our own dlerror() implementation under Darwin
+#if (defined(HAVE_DLERROR) && !defined(__EMX__)) || defined(__DARWIN__)
+ #define wxHAVE_DYNLIB_ERROR
#endif
-#ifdef __WXMSW__
-#include "wx/msw/private.h"
-#endif
+class WXDLLIMPEXP_FWD_BASE wxDynamicLibraryDetailsCreator;
// ----------------------------------------------------------------------------
// 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;
+// 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;
+ typedef void *wxDllType;
#elif defined(HAVE_SHL_LOAD)
-#include <dl.h>
-typedef shl_t wxDllType;
-#elif defined(__DARWIN__)
-typedef void *wxDllType;
+ #include <dl.h>
+ typedef shl_t wxDllType;
#elif defined(__WXMAC__)
-typedef CFragConnectionID wxDllType;
+ #include <CodeFragments.h>
+ typedef CFragConnectionID wxDllType;
#else
-#error "Dynamic Loading classes can't be compiled on this platform, sorry."
+ #error "Dynamic Loading classes can't be compiled on this platform, sorry."
#endif
-
-// ---------------------------------------------------------------------------
-// wxDynamicLibrary
-// ---------------------------------------------------------------------------
-
-//FIXME: This class isn't really common at all, it should be moved
-// into platform dependent files.
-
-// NOTE: this class is (deliberately) not virtual, do not attempt
-// to use it polymorphically.
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
enum wxDLFlags
{
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
+ 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)
- // FIXME: why? (VZ)
-#ifdef __osf__
- wxDL_DEFAULT = wxDL_LAZY
-#else
- wxDL_DEFAULT = wxDL_LAZY | wxDL_GLOBAL
-#endif
+ 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
+ wxDL_MODULE // loadable module/plugin
};
enum wxPluginCategory
{
wxDL_PLUGIN_GUI, // plugin that uses GUI classes
- wxDL_PLUGIN_BASE, // wxBase-only plugin
+ wxDL_PLUGIN_BASE // wxBase-only plugin
};
+// ----------------------------------------------------------------------------
+// macros
+// ----------------------------------------------------------------------------
-class WXDLLIMPEXP_BASE wxDynamicLibrary
+// 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:
- // return a valid handle for the main program itself or NULL if
- // back linking is not supported by the current platform (e.g. Win32)
+ // ctor, normally never used as these objects are only created by
+ // wxDynamicLibrary::ListLoaded()
+ wxDynamicLibraryDetails() { m_address = NULL; m_length = 0; }
- static wxDllType GetProgramHandle();
+ // get the (base) name
+ wxString GetName() const { return m_name; }
+
+ // get the full path of this object
+ wxString GetPath() const { return m_path; }
- // return the platform standard DLL extension (with leading dot)
+ // 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;
+
+ if ( addr )
+ *addr = m_address;
+ if ( len )
+ *len = m_length;
- static const wxChar *GetDllExt() { return ms_dllext; }
+ return true;
+ }
- wxDynamicLibrary() : m_handle(0) {}
+ // 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);
+
+// ----------------------------------------------------------------------------
+// wxDynamicLibrary: represents a handle to a DLL/shared object
+// ----------------------------------------------------------------------------
+
+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 wxString GetDllExt(wxDynamicLibraryCategory cat = wxDL_LIBRARY);
+
+ wxDynamicLibrary() : m_handle(0) { }
wxDynamicLibrary(const wxString& libname, int flags = wxDL_DEFAULT)
: m_handle(0)
{
Load(libname, flags);
}
- ~wxDynamicLibrary() { Unload(); }
- // return TRUE if the library was loaded successfully
+ // 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 on success
+ // load the library with the given name (full or not), return true if ok
+ bool Load(const wxString& libname, int flags = wxDL_DEFAULT);
- bool Load(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
+ // 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 library, also done automatically in dtor
+ // unload the given library handle (presumably returned by Detach() before)
+ static void Unload(wxDllType handle);
- void Unload();
-
- // Return the raw handle from dlopen and friends.
+ // 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; }
- // 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;
-
-#if WXWIN_COMPATIBILITY_2_2
- operator bool() const { return IsLoaded(); }
+ // 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
+ }
+
+#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 wxWindows plugin (adds compiler and version info
+ // return name of wxWidgets plugin (adds compiler and version info
// to the filename):
- static wxString CanonicalizePluginName(const wxString& name,
- wxPluginCategory cat);
+ 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();
-protected:
- // Platform specific shared lib suffix.
+#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 wxString& name, void *addr);
+#endif // __WINDOWS__
- 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
-// ----------------------------------------------------------------------------
-
-#include "wx/hash.h"
-
-class WXDLLIMPEXP_BASE wxLibrary : public wxObject
-{
-public:
- wxLibrary(wxDllType handle);
- virtual ~wxLibrary();
-
- // Get a symbol from the dynamic library
- void *GetSymbol(const wxString& symbname);
+protected:
+ // common part of GetSymbol() and HasSymbol()
+ void *DoGetSymbol(const wxString& name, bool *success = 0) const;
- // Create the object whose classname is "name"
- wxObject *CreateObject(const wxString& name);
+#ifdef wxHAVE_DYNLIB_ERROR
+ // log the error after a dlxxx() function failure
+ static void Error();
+#endif // wxHAVE_DYNLIB_ERROR
-protected:
- void PrepareClasses(wxClassInfo *first);
+ // the handle to DLL or NULL
wxDllType m_handle;
-public:
- wxHashTable classTable;
+ // no copy ctor/assignment operators (or we'd try to unload the library
+ // twice)
+ wxDECLARE_NO_COPY_CLASS(wxDynamicLibrary);
};
+#ifdef __WINDOWS__
+
// ----------------------------------------------------------------------------
-// wxLibraries
+// wxLoadedDLL is a MSW-only internal helper class allowing to dynamically bind
+// to a DLL already loaded into the project address space
// ----------------------------------------------------------------------------
-class WXDLLIMPEXP_BASE wxLibraries
+class wxLoadedDLL : public wxDynamicLibrary
{
public:
- wxLibraries();
- ~wxLibraries();
-
- // caller is responsible for deleting the returned pointer if !NULL
- wxLibrary *LoadLibrary(const wxString& basename);
-
- wxObject *CreateObject(const wxString& name);
+ wxLoadedDLL(const wxString& dllname)
+ : wxDynamicLibrary(dllname, wxDL_GET_LOADED | wxDL_VERBATIM | wxDL_QUIET)
+ {
+ }
-protected:
- wxList m_loaded;
+ ~wxLoadedDLL()
+ {
+ Detach();
+ }
};
-// ----------------------------------------------------------------------------
-// Global variables
-// ----------------------------------------------------------------------------
-
-extern WXDLLIMPEXP_DATA_BASE(wxLibraries) wxTheLibraries;
-
-#endif // WXWIN_COMPATIBILITY_2_2 && wxUSE_DYNAMIC_LOADER
+#endif // __WINDOWS__
// ----------------------------------------------------------------------------
// Interesting defines
projects / wxWidgets.git / blobdiff