a draft of wxSSBase class - it is yet unused and hopefully doesn't break anything...

[wxWidgets.git] / include / wx / dynlib.h

diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h
index 428048ce145fa66c974318881abdef3064abff60..56fd795c0b659b8c67b2079d3e5e524797c1b295 100644 (file)
--- a/include/wx/dynlib.h
+++ b/include/wx/dynlib.h
@@ -1,95 +1,246 @@
+/////////////////////////////////////////////////////////////////////////////
+// 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__
 #ifndef _WX_DYNLIB_H__
 #define _WX_DYNLIB_H__
 
 #ifdef __GNUG__

-#pragma interface
+#   pragma interface

 #endif
 
 #endif
 

-#include <wx/string.h>
-#include <wx/list.h>
-#include <wx/dynarray.h>
-
-// ---------------------------------------------------------------------------
-// Some more info on a class
-
-typedef struct {
-  wxClassInfo *class_info;
-  wxString path;
-} wxClassLibInfo;
-
-// ---------------------------------------------------------------------------
-// Useful arrays
-
-WX_DEFINE_ARRAY(wxClassInfo *, wxArrayClassInfo);
-WX_DEFINE_ARRAY(wxClassLibInfo *, wxArrayClassLibInfo);
-
-// ---------------------------------------------------------------------------
-// wxClassLibrary
+#include "wx/setup.h"
+
+#if wxUSE_DYNAMIC_LOADER
+
+#include "wx/dynload.h"  // Use the new (version of) wxDynamicLibrary instead
+
+#elif 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

 
 

-class wxClassLibrary {
-protected:
-  wxArrayClassLibInfo m_list;
+// ----------------------------------------------------------------------------
+// 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:
 public:

-  wxClassLibrary(void);
-  ~wxClassLibrary(void);
-
-  // Dynamic (un)register a (new) class in the database
-  void RegisterClass(wxClassInfo *class_info, const wxString& path);
-  void UnregisterClass(wxClassInfo *class_info);
-
-  // Fetch all infos whose name matches the string (wildcards allowed)
-  bool FetchInfos(const wxString& path, wxArrayClassLibInfo& infos);
+    /*
+      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 = 0);
+
+    /*
+      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,
+                           bool *success = NULL);
+
+    // return the standard DLL extension (with leading dot) for this platform
+    static const wxString &GetDllExt() { return ms_dllext; }
+
+private:
+    // forbid construction of objects
+    wxDllLoader();
+    static const wxString   ms_dllext;
+};

 
 

-  // Create all objects whose name matches the string (wildcards allowed)
-  bool CreateObjects(const wxString& path, wxArrayClassInfo& objs);
+// ----------------------------------------------------------------------------
+// wxDynamicLibrary - friendly interface to wxDllLoader
+// ----------------------------------------------------------------------------

 
 

-  // Create one object using the EXACT name
-  wxObject *CreateObject(const wxString& path);
+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
 // wxLibrary

+// ----------------------------------------------------------------------------

 
 

-class wxLibrary: public wxObject {
-protected:
-  wxClassLibrary *m_liblist;
-  void *m_handle;
+class WXDLLEXPORT wxLibrary : public wxObject
+{

 public:
 public:

-  wxLibrary(void *handle);
-  ~wxLibrary(void);
+    wxLibrary(wxDllType handle);
+    virtual ~wxLibrary();
+
+    // Get a symbol from the dynamic library
+    void *GetSymbol(const wxString& symbname);
+
+    // Create the object whose classname is "name"
+    wxObject *CreateObject(const wxString& name);

 
 

-  // Get a symbol from the dynamic library
-  void *GetSymbol(const wxString& symbname);
+protected:
+    void PrepareClasses(wxClassInfo *first);

 
 

-  // Create the object whose classname is "name"
-  wxObject *CreateObject(const wxString& name);
+    wxDllType m_handle;

 
 

-  wxClassLibrary *ClassLib() const;
+public:
+    wxHashTable classTable;

 };
 
 };
 

-// ---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------

 // wxLibraries
 // wxLibraries

+// ----------------------------------------------------------------------------

 
 

-class wxLibraries {
-protected:
-  wxList m_loaded;
+class WXDLLEXPORT wxLibraries
+{

 public:
 public:

-  wxLibraries(void);
-  ~wxLibraries(void);
+    wxLibraries();
+    ~wxLibraries();

 
 

-  wxLibrary *LoadLibrary(const wxString& name);
-  wxObject *CreateObject(const wxString& name);
+    // caller is responsible for deleting the returned pointer if !NULL
+    wxLibrary *LoadLibrary(const wxString& basename);
+
+    wxObject *CreateObject(const wxString& name);
+
+protected:
+    wxList m_loaded;

 };
 
 };
 

-// ---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------

 // Global variables
 // Global variables

+// ----------------------------------------------------------------------------

 
 

-extern wxLibraries wxTheLibraries;
+extern WXDLLEXPORT_DATA(wxLibraries) wxTheLibraries;

 
 

-// ---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------

 // Interesting defines
 // Interesting defines

+// ----------------------------------------------------------------------------

 
 

-#define WXDLL_ENTRY_FUNCTION() extern "C" wxClassLibrary *GetClassList()
-#define WXDLL_EXIT_FUNCTION(param) extern "C" void FreeClassList(wxClassLibrary *param)
+#define WXDLL_ENTRY_FUNCTION() \
+extern "C" WXEXPORT const wxClassInfo *wxGetClassFirst(); \
+const wxClassInfo *wxGetClassFirst() { \
+  return wxClassInfo::GetFirst(); \
+}

 
 

-#endif
+#endif // wxUSE_DYNLIB_CLASS
+
+#endif // _WX_DYNLIB_H__