+/////////////////////////////////////////////////////////////////////////////
+// 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 license
+/////////////////////////////////////////////////////////////////////////////
+
#ifndef _WX_DYNLIB_H__
#define _WX_DYNLIB_H__
#ifdef __GNUG__
-#pragma interface
+# pragma interface
#endif
-#include <wx/string.h>
-#include <wx/list.h>
-#include <wx/dynarray.h>
-#include <wx/hash.h>
-
-#ifdef LoadLibrary
-#undef LoadLibrary
+#include "wx/setup.h"
+
+#if 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
+#endif // !Unix or already have some HAVE_xxx defined
+
+// 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 <os2.h>
+ typedef HMODULE 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(__WINDOWS__)
+# include <windows.h> // needed to get HMODULE
+ typedef HMODULE wxDllType;
+#elif defined(__DARWIN__)
+ typedef void *wxDllType;
+#elif defined(__WXMAC__)
+ typedef CFragConnectionID wxDllType;
+#else
+# error "wxLibrary can't be compiled on this platform, sorry."
+#endif // OS
+
+// 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
-// ---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+// wxDllLoader: low level DLL functions, use wxDynamicLibrary in your code
+// ----------------------------------------------------------------------------
+
+/*
+ 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:
+ /*
+ 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 = 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();
+
+ /*
+ 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);
+
+ // return the standard DLL extension (with leading dot) for this platform
+ static wxString GetDllExt();
+
+private:
+ // forbid construction of objects
+ wxDllLoader();
+};
+
+// ----------------------------------------------------------------------------
+// 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 wxLibrary: public wxObject {
- protected:
- void *m_handle;
- bool m_destroy;
- public:
- wxHashTable classTable;
+class WXDLLEXPORT wxLibrary : public wxObject
+{
+public:
+ wxLibrary(wxDllType handle);
+ virtual ~wxLibrary();
- public:
- wxLibrary(void *handle);
- ~wxLibrary(void);
+ // 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);
+protected:
+ void PrepareClasses(wxClassInfo *first);
- // Merge the symbols with the main symbols: WARNING! the library will not
- // be unloaded.
- void MergeWithSystem();
+ wxDllType m_handle;
- protected:
- void PrepareClasses(wxClassInfo *first);
+public:
+ wxHashTable classTable;
};
-// ---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
// wxLibraries
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxLibraries
+{
+public:
+ wxLibraries();
+ ~wxLibraries();
+
+ // caller is responsible for deleting the returned pointer if !NULL
+ wxLibrary *LoadLibrary(const wxString& basename);
-class wxLibraries {
- protected:
- wxList m_loaded;
- public:
- wxLibraries(void);
- ~wxLibraries(void);
+ wxObject *CreateObject(const wxString& name);
- wxLibrary *LoadLibrary(const wxString& name);
- wxObject *CreateObject(const wxString& name);
+protected:
+ wxList m_loaded;
};
-// ---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
// Global variables
+// ----------------------------------------------------------------------------
extern wxLibraries wxTheLibraries;
-// ---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
// Interesting defines
+// ----------------------------------------------------------------------------
#define WXDLL_ENTRY_FUNCTION() \
extern "C" wxClassInfo *wxGetClassFirst(); \
return wxClassInfo::GetFirst(); \
}
-#endif
+#endif // wxUSE_DYNLIB_CLASS
+
+#endif // _WX_DYNLIB_H__
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