moved MGL initialization to earlier stage (crashes otherwise...) and implemented...

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

diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h
index 98bc1839a60e1c62607d3cedc4d4f1a8644f914a..a08ed217a83ecdf1d6c9c04f2fe3374c127b930c 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
 /////////////////////////////////////////////////////////////////////////////
 


@@ -13,61 +13,176 @@
 #define _WX_DYNLIB_H__
 
 #ifdef __GNUG__
 #define _WX_DYNLIB_H__
 
 #ifdef __GNUG__

-    #pragma interface
+#   pragma interface

 #endif
 
 #endif
 

-#include <wx/setup.h>
+#include "wx/setup.h"

 
 #if wxUSE_DYNLIB_CLASS
 
 
 #if wxUSE_DYNLIB_CLASS
 

-#include <wx/string.h>
-#include <wx/list.h>
-#include <wx/hash.h>
+#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))
 
 // 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
+#   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
 
 #endif // !Unix or already have some HAVE_xxx defined
 

-#if defined(HAVE_DLOPEN)
-    #include <dlfcn.h>
-
+// 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)
     typedef void *wxDllType;
 #elif defined(HAVE_SHL_LOAD)

-    #include <dl.h>
-
+#   include <dl.h>

     typedef shl_t wxDllType;
 #elif defined(__WINDOWS__)
     typedef shl_t wxDllType;
 #elif defined(__WINDOWS__)

-    #include <windows.h>
-
+#   include <windows.h>         // needed to get HMODULE

     typedef HMODULE wxDllType;
     typedef HMODULE wxDllType;

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

 #elif defined(__WXMAC__)
     typedef CFragConnectionID wxDllType;
 #else
 #elif defined(__WXMAC__)
     typedef CFragConnectionID wxDllType;
 #else

-    #error "wxLibrary can't be compiled on this platform, sorry."
+#   error "wxLibrary can't be compiled on this platform, sorry."

 #endif // OS
 
 #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
 
 // ----------------------------------------------------------------------------
 #endif
 
 // ----------------------------------------------------------------------------

-// wxLibrary
+// wxDllLoader: low level DLL functions, use wxDynamicLibrary in your code

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

-class wxLibrary : public wxObject
+/*
+    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:

-    wxHashTable classTable;
+    /*
+      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 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);
+
+    // return the standard DLL extension (with leading dot) for this platform
+    static wxString GetDllExt();
+
+private:
+    // forbid construction of objects
+    wxDllLoader();
+};
+
+// ----------------------------------------------------------------------------
+// wxDynamicLibrary - friendly interface to wxDllLoader
+// ----------------------------------------------------------------------------

 
 

+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
+// ----------------------------------------------------------------------------
+
+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);


@@ -79,13 +194,16 @@ protected:
     void PrepareClasses(wxClassInfo *first);
 
     wxDllType m_handle;
     void PrepareClasses(wxClassInfo *first);
 
     wxDllType m_handle;

+
+public:
+    wxHashTable classTable;

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

-class wxLibraries
+class WXDLLEXPORT wxLibraries

 {
 public:
     wxLibraries();
 {
 public:
     wxLibraries();