/////////////////////////////////////////////////////////////////////////////
-// 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
/////////////////////////////////////////////////////////////////////////////
#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 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.
+ /*
+ 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 wxDllType LoadLibrary(const wxString & libname, bool *success = NULL);
- /** This function unloads the shared library. */
static void UnloadLibrary(wxDllType dll);
- /** This function returns a valid handle for the main program
- itself. */
- static wxDllType GetProgramHandle(void);
- /** 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.
+
+ /*
+ 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);
static wxString GetDllExt();
private:
- /// forbid construction of objects
+ // forbid construction of objects
wxDllLoader();
};
// ----------------------------------------------------------------------------
-// wxLibrary
+// wxDynamicLibrary - friendly interface to wxDllLoader
// ----------------------------------------------------------------------------
-class WXDLLEXPORT 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
projects / wxWidgets.git / blobdiff