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

diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h
index b13587e3e5f877a439efe1def123adc01a22987b..a3c4f2d98b0fd9ed06bf9982cf1cb17897894cbf 100644 (file)
--- 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:      $Id$
 // Modified by:
 // Created:     20/07/98
 // RCS-ID:      $Id$

-// Copyright:   (c) Guilhem Lavaux
+// Copyright:   (c) 1998 Guilhem Lavaux

 // Licence:     wxWindows license
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows license
 /////////////////////////////////////////////////////////////////////////////
 


@@ -18,7 +18,11 @@
 
 #include "wx/setup.h"
 
 
 #include "wx/setup.h"
 

-#if wxUSE_DYNLIB_CLASS
+#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/string.h"
 #include "wx/list.h"


@@ -48,8 +52,10 @@
 #elif defined(__WINDOWS__)
 #   include <windows.h>         // needed to get HMODULE
     typedef HMODULE wxDllType;
 #elif defined(__WINDOWS__)
 #   include <windows.h>         // needed to get HMODULE
     typedef HMODULE wxDllType;

+#elif defined(__DARWIN__)
+    typedef void *wxDllType;

 #elif defined(__WXMAC__)
 #elif defined(__WXMAC__)

-    typedef CFragConnectionID wxDllType;
+    typedef void *wxDllType;

 #else
 #   error "wxLibrary can't be compiled on this platform, sorry."
 #endif // OS
 #else
 #   error "wxLibrary can't be compiled on this platform, sorry."
 #endif // OS


@@ -61,59 +67,129 @@
 #endif
 
 // ----------------------------------------------------------------------------
 #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:
 */
 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 = 0);
+
+    /*
+      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);
     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 void *GetSymbol(wxDllType dllHandle,
+                           const wxString &name,
+                           bool *success = NULL);

 
     // return the standard DLL extension (with leading dot) for this platform
 
     // return the standard DLL extension (with leading dot) for this platform

-    static wxString GetDllExt();
+    static const wxString &GetDllExt() { return ms_dllext; }

 
 private:
 
 private:

-    /// forbid construction of objects
+    // forbid construction of objects

     wxDllLoader();
     wxDllLoader();

+    static const wxString   ms_dllext;

 };
 
 // ----------------------------------------------------------------------------
 };
 
 // ----------------------------------------------------------------------------

-// wxLibrary
+// wxDynamicLibrary - friendly interface to wxDllLoader

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-class WXDLLEXPORT wxLibrary : public wxObject
+class WXDLLEXPORT wxDynamicLibrary

 {
 public:
 {
 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);
 public:
     wxLibrary(wxDllType handle);

-    ~wxLibrary();
+    virtual ~wxLibrary();

 
     // Get a symbol from the dynamic library
     void *GetSymbol(const wxString& symbname);
 
     // Get a symbol from the dynamic library
     void *GetSymbol(const wxString& symbname);


@@ -125,9 +201,10 @@ protected:
     void PrepareClasses(wxClassInfo *first);
 
     wxDllType m_handle;
     void PrepareClasses(wxClassInfo *first);
 
     wxDllType m_handle;

-};
-

 
 

+public:
+    wxHashTable classTable;
+};

 
 // ----------------------------------------------------------------------------
 // wxLibraries
 
 // ----------------------------------------------------------------------------
 // wxLibraries


@@ -152,15 +229,15 @@ protected:
 // Global variables
 // ----------------------------------------------------------------------------
 
 // Global variables
 // ----------------------------------------------------------------------------
 

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

 
 // ----------------------------------------------------------------------------
 // Interesting defines
 // ----------------------------------------------------------------------------
 
 #define WXDLL_ENTRY_FUNCTION() \
 
 // ----------------------------------------------------------------------------
 // Interesting defines
 // ----------------------------------------------------------------------------
 
 #define WXDLL_ENTRY_FUNCTION() \

-extern "C" wxClassInfo *wxGetClassFirst(); \
-wxClassInfo *wxGetClassFirst() { \
+extern "C" WXEXPORT const wxClassInfo *wxGetClassFirst(); \
+const wxClassInfo *wxGetClassFirst() { \

   return wxClassInfo::GetFirst(); \
 }
 
   return wxClassInfo::GetFirst(); \
 }