/////////////////////////////////////////////////////////////////////////////
-// 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
+// Copyright: (c) 1998 Guilhem Lavaux
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
# pragma interface
#endif
-#include <wx/setup.h>
+#include "wx/setup.h"
-#if wxUSE_DYNLIB_CLASS
+#if wxUSE_DYNAMIC_LOADER
-#include <wx/string.h>
-#include <wx/list.h>
-#include <wx/hash.h>
+#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))
# endif // Unix flavour
#endif // !Unix or already have some HAVE_xxx defined
-#if defined(HAVE_DLOPEN)
+// 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>
+# include <windows.h> // needed to get HMODULE
typedef HMODULE wxDllType;
+#elif defined(__DARWIN__)
+ typedef void *wxDllType;
#elif defined(__WXMAC__)
- typedef CFragConnectionID wxDllType;
+ typedef void *wxDllType;
#else
# error "wxLibrary can't be compiled on this platform, sorry."
#endif // OS
-// defined in windows.h
-#ifdef LoadLibrary
-# undef LoadLibrary
+// 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
+// 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 the wxLibrary framework 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.
+
+/*
+ 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 wxDllLoader
+class WXDLLEXPORT wxDllLoader
{
- public:
- /** This function loads a shared library into memory, with libname
- being the basename of the library, without the filename
- extension. No initialisation of the library will be done.
- @param libname Name of the shared object to load.
- @param success Must point to a bool variable which will be set to TRUE or FALSE.
- @return A handle to the loaded DLL. Use success parameter to test if it is valid.
- */
- static wxDllType LoadLibrary(const wxString & libname, bool *success);
- /** This function resolves a symbol in a loaded DLL, such as a
+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 = 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.
- @param dllHandle Handle of the DLL, as returned by LoadDll().
- @param name Name of the symbol.
- @return A pointer to the symbol.
- */
- static void * GetSymbol(wxDllType dllHandle, const wxString &name);
- private:
- /// forbid construction of objects
- wxDllLoader();
+
+ 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;
};
// ----------------------------------------------------------------------------
-// wxLibrary
+// wxDynamicLibrary - friendly interface to wxDllLoader
// ----------------------------------------------------------------------------
-class wxLibrary : public wxObject
+class WXDLLEXPORT wxDynamicLibrary
{
public:
- wxHashTable classTable;
+ // 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 WXDLLEXPORT wxLibrary : public wxObject
+{
public:
wxLibrary(wxDllType handle);
- ~wxLibrary();
+ virtual ~wxLibrary();
// Get a symbol from the dynamic library
void *GetSymbol(const wxString& symbname);
void PrepareClasses(wxClassInfo *first);
wxDllType m_handle;
-};
-
+public:
+ wxHashTable classTable;
+};
// ----------------------------------------------------------------------------
// wxLibraries
// ----------------------------------------------------------------------------
-class wxLibraries
+class WXDLLEXPORT wxLibraries
{
public:
wxLibraries();
// Global variables
// ----------------------------------------------------------------------------
-extern wxLibraries wxTheLibraries;
+extern WXDLLEXPORT_DATA(wxLibraries) wxTheLibraries;
// ----------------------------------------------------------------------------
// Interesting defines
// ----------------------------------------------------------------------------
#define WXDLL_ENTRY_FUNCTION() \
-extern "C" wxClassInfo *wxGetClassFirst(); \
-wxClassInfo *wxGetClassFirst() { \
+extern "C" WXEXPORT const wxClassInfo *wxGetClassFirst(); \
+const wxClassInfo *wxGetClassFirst() { \
return wxClassInfo::GetFirst(); \
}
projects / wxWidgets.git / blobdiff