/////////////////////////////////////////////////////////////////////////////
-// 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
-// Licence: wxWindows license
+// Copyright: (c) 1998 Guilhem Lavaux
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_DYNLIB_H__
#define _WX_DYNLIB_H__
-#ifdef __GNUG__
- #pragma interface
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
+# pragma interface "dynlib.h"
#endif
-#include <wx/string.h>
-#include <wx/list.h>
-#include <wx/hash.h>
+#include "wx/setup.h"
-#if defined(HAVE_DLOPEN)
- #include <dlfcn.h>
+#if wxUSE_DYNLIB_CLASS
- typedef void *wxDllType;
-#elif defined(HAVE_SHLLOAD)
- #include <dl.h>
+#include "wx/string.h"
+
+// FIXME: can this go in private.h or something too??
+#if defined(__WXPM__) || defined(__EMX__)
+#define INCL_DOS
+#include <os2.h>
+#endif
- typedef void *wxDllType;
-#elif defined(__WINDOWS__)
- #include <windows.h>
+#ifdef __WXMSW__
+#include "wx/msw/private.h"
+#endif
- typedef HMODULE wxDllType;
+// ----------------------------------------------------------------------------
+// conditional compilation
+// ----------------------------------------------------------------------------
+
+// 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__) || defined(__WINDOWS__)
+ 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(__DARWIN__)
+ typedef void *wxDllType;
#elif defined(__WXMAC__)
- typedef CFragConnectionID wxDllType;
+ #include <CodeFragments.h>
+ typedef CFragConnectionID wxDllType;
#else
- #error "wxLibrary can't be compiled on this platform, sorry."
-#endif // OS
+ #error "Dynamic Loading classes can't be compiled on this platform, sorry."
+#endif
-// defined in windows.h
-#ifdef LoadLibrary
- #undef LoadLibrary
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+enum wxDLFlags
+{
+ wxDL_LAZY = 0x00000001, // resolve undefined symbols at first use
+ wxDL_NOW = 0x00000002, // resolve undefined symbols on load
+ wxDL_GLOBAL = 0x00000004, // export extern symbols to subsequently
+ // loaded libs.
+ wxDL_VERBATIM = 0x00000008, // Attempt to load the supplied library
+ // name without appending the usual dll
+ // filename extension.
+
+ wxDL_NOSHARE = 0x00000010, // load new DLL, don't reuse already loaded
+
+ // FIXME: why? (VZ)
+#ifdef __osf__
+ wxDL_DEFAULT = wxDL_LAZY
+#else
+ wxDL_DEFAULT = wxDL_LAZY | wxDL_GLOBAL
#endif
+};
+
+enum wxDynamicLibraryCategory
+{
+ wxDL_LIBRARY, // standard library
+ wxDL_MODULE // loadable module/plugin
+};
+
+enum wxPluginCategory
+{
+ wxDL_PLUGIN_GUI, // plugin that uses GUI classes
+ wxDL_PLUGIN_BASE // wxBase-only plugin
+};
// ----------------------------------------------------------------------------
-// wxLibrary
+// macros
// ----------------------------------------------------------------------------
-class wxLibrary : public wxObject
+// when loading a function from a DLL you always have to cast the returned
+// "void *" pointer to the correct type and, even more annoyingly, you have to
+// repeat this type twice if you want to declare and define a function pointer
+// all in one line
+//
+// this macro makes this slightly less painful by allowing you to specify the
+// type only once, as the first parameter, and creating a variable of this type
+// called "pfn<name>" initialized with the "name" from the "dynlib"
+#define wxDYNLIB_FUNCTION(type, name, dynlib) \
+ type pfn ## name = (type)(dynlib).GetSymbol(_T(#name))
+
+// ---------------------------------------------------------------------------
+// wxDynamicLibrary
+// ---------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxDynamicLibrary
{
public:
- wxHashTable classTable;
+ // return 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();
+
+ // return the platform standard DLL extension (with leading dot)
+ static const wxChar *GetDllExt() { return ms_dllext; }
+
+ wxDynamicLibrary() : m_handle(0) { }
+ wxDynamicLibrary(const wxString& libname, int flags = wxDL_DEFAULT)
+ : m_handle(0)
+ {
+ Load(libname, flags);
+ }
+
+ // NOTE: this class is (deliberately) not virtual, do not attempt
+ // to use it polymorphically.
+ ~wxDynamicLibrary() { Unload(); }
+
+ // return true if the library was loaded successfully
+ bool IsLoaded() const { return m_handle != 0; }
+
+ // load the library with the given name (full or not), return true if ok
+ bool Load(wxString libname, int flags = wxDL_DEFAULT);
+
+ // detach the library object from its handle, i.e. prevent the object from
+ // unloading the library in its dtor -- the caller is now responsible for
+ // doing this
+ wxDllType Detach() { wxDllType h = m_handle; m_handle = 0; return h; }
+
+ // unload the given library handle (presumably returned by Detach() before)
+ static void Unload(wxDllType handle);
+
+ // unload the library, also done automatically in dtor
+ void Unload() { if ( IsLoaded() ) { Unload(m_handle); m_handle = 0; } }
+
+ // Return the raw handle from dlopen and friends.
+ wxDllType GetLibHandle() const { return m_handle; }
+
+ // check if the given symbol is present in the library, useful to verify if
+ // a loadable module is our plugin, for example, without provoking error
+ // messages from GetSymbol()
+ bool HasSymbol(const wxString& name) const
+ {
+ bool ok;
+ DoGetSymbol(name, &ok);
+ return ok;
+ }
+
+ // resolve a symbol in a loaded DLL, such as a variable or function name.
+ // 'name' is the (possibly mangled) name of the symbol. (use extern "C" to
+ // export unmangled names)
+ //
+ // Since it is perfectly valid for the returned symbol to actually be NULL,
+ // that is not always indication of an error. Pass and test the parameter
+ // 'success' for a true indication of success or failure to load the
+ // symbol.
+ //
+ // Returns a pointer to the symbol on success, or NULL if an error occurred
+ // or the symbol wasn't found.
+ void *GetSymbol(const wxString& name, bool *success = 0) const;
+
+
+ // return platform-specific name of dynamic library with proper extension
+ // and prefix (e.g. "foo.dll" on Windows or "libfoo.so" on Linux)
+ static wxString CanonicalizeName(const wxString& name,
+ wxDynamicLibraryCategory cat = wxDL_LIBRARY);
+
+ // return name of wxWidgets plugin (adds compiler and version info
+ // to the filename):
+ static wxString
+ CanonicalizePluginName(const wxString& name,
+ wxPluginCategory cat = wxDL_PLUGIN_GUI);
+ // return plugin directory on platforms where it makes sense and empty
+ // string on others:
+ static wxString GetPluginsDirectory();
+
+
+#if WXWIN_COMPATIBILITY_2_2
+ operator bool() const { return IsLoaded(); }
+#endif
+
+protected:
+ // the real implementation of GetSymbol()
+ void *DoGetSymbol(const wxString& name, bool *success = 0) const;
+
+
+ // platform specific shared lib suffix.
+ static const wxChar *ms_dllext;
+
+ // the handle to DLL or NULL
+ wxDllType m_handle;
+
+ // no copy ctor/assignment operators (or we'd try to unload the library
+ // twice)
+ DECLARE_NO_COPY_CLASS(wxDynamicLibrary)
+};
+
+
+// ----------------------------------------------------------------------------
+// wxDllLoader: low level DLL functions, use wxDynamicLibrary in your code
+// ----------------------------------------------------------------------------
+
+#if WXWIN_COMPATIBILITY_2_2 && wxUSE_DYNAMIC_LOADER
+
+/*
+ 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 WXDLLIMPEXP_BASE wxDllLoader
+{
public:
- wxLibrary(void *handle);
- ~wxLibrary();
+ /*
+ 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& name, 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() { return wxDynamicLibrary::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, bool *success = 0);
+
+ // return the standard DLL extension (with leading dot) for this platform
+ static wxString GetDllExt() { return wxDynamicLibrary::GetDllExt(); }
+
+private:
+
+ wxDllLoader(); // forbid construction of objects
+};
+
+
+// ----------------------------------------------------------------------------
+// wxLibrary
+// ----------------------------------------------------------------------------
+
+#include "wx/hash.h"
+
+class WXDLLIMPEXP_BASE wxLibrary : public wxObject
+{
+public:
+ wxLibrary(wxDllType handle);
+ 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 WXDLLIMPEXP_BASE wxLibraries
{
public:
wxLibraries();
// Global variables
// ----------------------------------------------------------------------------
-extern wxLibraries wxTheLibraries;
+extern WXDLLIMPEXP_DATA_BASE(wxLibraries) wxTheLibraries;
+
+#endif // WXWIN_COMPATIBILITY_2_2 && wxUSE_DYNAMIC_LOADER
// ----------------------------------------------------------------------------
// Interesting defines
// ----------------------------------------------------------------------------
#define WXDLL_ENTRY_FUNCTION() \
-extern "C" wxClassInfo *wxGetClassFirst(); \
-wxClassInfo *wxGetClassFirst() { \
+extern "C" WXEXPORT const wxClassInfo *wxGetClassFirst(); \
+const wxClassInfo *wxGetClassFirst() { \
return wxClassInfo::GetFirst(); \
}
+#endif // wxUSE_DYNLIB_CLASS
+
#endif // _WX_DYNLIB_H__
projects / wxWidgets.git / blobdiff