X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/1a787c5dc89b1cb6a9ddb4ebef3ad2fb24b49c8c..748fbf95a859df3b1b9f8b95ee8cd0cc4d205a85:/include/wx/dynlib.h

diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h
index 313180829c..8b3aacdfa2 100644
--- a/include/wx/dynlib.h
+++ b/include/wx/dynlib.h
@@ -1,11 +1,11 @@
 /////////////////////////////////////////////////////////////////////////////
-// 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
 /////////////////////////////////////////////////////////////////////////////
 
@@ -48,6 +48,8 @@
 #elif defined(__WINDOWS__)
 #   include <windows.h>         // needed to get HMODULE
     typedef HMODULE wxDllType;
+#elif defined(__APPLE__) && defined(__UNIX__)
+    typedef void *wxDllType;
 #elif defined(__WXMAC__)
     typedef CFragConnectionID wxDllType;
 #else
@@ -61,56 +63,126 @@
 #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.
+    /*
+      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);
 
+    // return the standard DLL extension (with leading dot) for this platform
+    static wxString GetDllExt();
+
 private:
-    /// forbid construction of objects
+    // forbid construction of objects
     wxDllLoader();
 };
 
 // ----------------------------------------------------------------------------
-// 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);
@@ -122,15 +194,16 @@ protected:
     void PrepareClasses(wxClassInfo *first);
 
     wxDllType m_handle;
-};
-
 
+public:
+    wxHashTable classTable;
+};
 
 // ----------------------------------------------------------------------------
 // wxLibraries
 // ----------------------------------------------------------------------------
 
-class wxLibraries
+class WXDLLEXPORT wxLibraries
 {
 public:
     wxLibraries();