ced3df7730
1. Clearly document the wxDL_XXX macros; including their implicit usage of m_ok member variable 2. Made sure they're used in the same way in all places they are used (sometimes they were passed an object, sometimes a pointer, breaking compilation: see patch 1791288) 3. Don't allocate wxDynamicLibrary objects on heap unnecessarily (which removes the need to delete -- or leak, as it was -- them afterwards) 4. Some naming convention fixes git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@48625 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
361 lines
12 KiB
C++
361 lines
12 KiB
C++
/////////////////////////////////////////////////////////////////////////////
|
|
// 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) 1998 Guilhem Lavaux
|
|
// Licence: wxWindows licence
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef _WX_DYNLIB_H__
|
|
#define _WX_DYNLIB_H__
|
|
|
|
#include "wx/defs.h"
|
|
|
|
#if wxUSE_DYNLIB_CLASS
|
|
|
|
#include "wx/string.h"
|
|
#include "wx/dynarray.h"
|
|
|
|
#if defined(__OS2__) || defined(__EMX__)
|
|
#include "wx/os2/private.h"
|
|
#endif
|
|
|
|
#ifdef __WXMSW__
|
|
#include "wx/msw/private.h"
|
|
#endif
|
|
|
|
// note that we have our own dlerror() implementation under Darwin
|
|
#if (defined(HAVE_DLERROR) && !defined(__EMX__)) || defined(__DARWIN__)
|
|
#define wxHAVE_DYNLIB_ERROR
|
|
#endif
|
|
|
|
class WXDLLIMPEXP_FWD_BASE wxDynamicLibraryDetailsCreator;
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// conditional compilation
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// Note: __OS2__/EMX has to be tested first, since we want to use
|
|
// native version, even if configure detected presence of DLOPEN.
|
|
#if defined(__OS2__) || 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__)
|
|
#include <CodeFragments.h>
|
|
typedef CFragConnectionID wxDllType;
|
|
#else
|
|
#error "Dynamic Loading classes can't be compiled on this platform, sorry."
|
|
#endif
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// constants
|
|
// ----------------------------------------------------------------------------
|
|
|
|
enum wxDLFlags
|
|
{
|
|
wxDL_LAZY = 0x00000001, // resolve undefined symbols at first use
|
|
// (only works on some Unix versions)
|
|
wxDL_NOW = 0x00000002, // resolve undefined symbols on load
|
|
// (default, always the case under Win32)
|
|
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
|
|
// (only for wxPluginManager)
|
|
|
|
wxDL_DEFAULT = wxDL_NOW // default flags correspond to Win32
|
|
};
|
|
|
|
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
|
|
};
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// macros
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// 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))
|
|
|
|
|
|
// the following macros can be used to redirect a whole library to a class and
|
|
// check at run-time if the library is present and contains all required
|
|
// methods
|
|
//
|
|
// notice that they are supposed to be used inside a class which has "m_ok"
|
|
// member variable indicating if the library had been successfully loaded
|
|
|
|
// helper macros constructing the name of the variable storing the function
|
|
// pointer and the name of its type from the function name
|
|
#define wxDL_METHOD_NAME(name) m_pfn ## name
|
|
#define wxDL_METHOD_TYPE(name) name ## _t
|
|
|
|
// parameters are:
|
|
// - rettype: return type of the function, e.g. "int"
|
|
// - name: name of the function, e.g. "foo"
|
|
// - args: function signature in parentheses, e.g. "(int x, int y)"
|
|
// - argnames: the names of the parameters in parentheses, e.g. "(x, y)"
|
|
// - defret: the value to return if the library wasn't successfully loaded
|
|
#define wxDL_METHOD_DEFINE( rettype, name, args, argnames, defret ) \
|
|
typedef rettype (* wxDL_METHOD_TYPE(name)) args ; \
|
|
wxDL_METHOD_TYPE(name) wxDL_METHOD_NAME(name); \
|
|
rettype name args \
|
|
{ return m_ok ? wxDL_METHOD_NAME(name) argnames : defret; }
|
|
|
|
#define wxDL_VOIDMETHOD_DEFINE( name, args, argnames ) \
|
|
typedef void (* wxDL_METHOD_TYPE(name)) args ; \
|
|
wxDL_METHOD_TYPE(name) wxDL_METHOD_NAME(name); \
|
|
void name args \
|
|
{ if ( m_ok ) wxDL_METHOD_NAME(name) argnames ; }
|
|
|
|
#define wxDL_METHOD_LOAD(lib, name) \
|
|
wxDL_METHOD_NAME(name) = \
|
|
(wxDL_METHOD_TYPE(name)) lib.GetSymbol(#name, &m_ok); \
|
|
if ( !m_ok ) return false
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// wxDynamicLibraryDetails: contains details about a loaded wxDynamicLibrary
|
|
// ----------------------------------------------------------------------------
|
|
|
|
class WXDLLIMPEXP_BASE wxDynamicLibraryDetails
|
|
{
|
|
public:
|
|
// ctor, normally never used as these objects are only created by
|
|
// wxDynamicLibrary::ListLoaded()
|
|
wxDynamicLibraryDetails() { m_address = NULL; m_length = 0; }
|
|
|
|
// get the (base) name
|
|
wxString GetName() const { return m_name; }
|
|
|
|
// get the full path of this object
|
|
wxString GetPath() const { return m_path; }
|
|
|
|
// get the load address and the extent, return true if this information is
|
|
// available
|
|
bool GetAddress(void **addr, size_t *len) const
|
|
{
|
|
if ( !m_address )
|
|
return false;
|
|
|
|
if ( addr )
|
|
*addr = m_address;
|
|
if ( len )
|
|
*len = m_length;
|
|
|
|
return true;
|
|
}
|
|
|
|
// return the version of the DLL (may be empty if no version info)
|
|
wxString GetVersion() const
|
|
{
|
|
return m_version;
|
|
}
|
|
|
|
private:
|
|
wxString m_name,
|
|
m_path,
|
|
m_version;
|
|
|
|
void *m_address;
|
|
size_t m_length;
|
|
|
|
friend class wxDynamicLibraryDetailsCreator;
|
|
};
|
|
|
|
WX_DECLARE_USER_EXPORTED_OBJARRAY(wxDynamicLibraryDetails,
|
|
wxDynamicLibraryDetailsArray,
|
|
WXDLLIMPEXP_BASE);
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// wxDynamicLibrary: represents a handle to a DLL/shared object
|
|
// ----------------------------------------------------------------------------
|
|
|
|
class WXDLLIMPEXP_BASE wxDynamicLibrary
|
|
{
|
|
public:
|
|
// 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 wxString& 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(const wxString& libname, int flags = wxDL_DEFAULT);
|
|
|
|
// raw function for loading dynamic libs: always behaves as if
|
|
// wxDL_VERBATIM were specified and doesn't log error message if the
|
|
// library couldn't be loaded but simply returns NULL
|
|
static wxDllType RawLoad(const 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 = NULL) const;
|
|
|
|
// low-level version of GetSymbol()
|
|
static void *RawGetSymbol(wxDllType handle, const wxString& name);
|
|
void *RawGetSymbol(const wxString& name) const
|
|
{
|
|
#if defined (__WXPM__) || defined(__EMX__)
|
|
return GetSymbol(name);
|
|
#else
|
|
return RawGetSymbol(m_handle, name);
|
|
#endif
|
|
}
|
|
|
|
#ifdef __WXMSW__
|
|
// this function is useful for loading functions from the standard Windows
|
|
// DLLs: such functions have an 'A' (in ANSI build) or 'W' (in Unicode, or
|
|
// wide character build) suffix if they take string parameters
|
|
static void *RawGetSymbolAorW(wxDllType handle, const wxString& name)
|
|
{
|
|
return RawGetSymbol
|
|
(
|
|
handle,
|
|
name +
|
|
#if wxUSE_UNICODE
|
|
L'W'
|
|
#else
|
|
'A'
|
|
#endif
|
|
);
|
|
}
|
|
|
|
void *GetSymbolAorW(const wxString& name) const
|
|
{
|
|
return RawGetSymbolAorW(m_handle, name);
|
|
}
|
|
#endif // __WXMSW__
|
|
|
|
// return all modules/shared libraries in the address space of this process
|
|
//
|
|
// returns an empty array if not implemented or an error occurred
|
|
static wxDynamicLibraryDetailsArray ListLoaded();
|
|
|
|
// 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();
|
|
|
|
|
|
protected:
|
|
// common part of GetSymbol() and HasSymbol()
|
|
void *DoGetSymbol(const wxString& name, bool *success = 0) const;
|
|
|
|
#ifdef wxHAVE_DYNLIB_ERROR
|
|
// log the error after a dlxxx() function failure
|
|
static void Error();
|
|
#endif // wxHAVE_DYNLIB_ERROR
|
|
|
|
|
|
// platform specific shared lib suffix.
|
|
static const wxString 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)
|
|
};
|
|
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// Interesting defines
|
|
// ----------------------------------------------------------------------------
|
|
|
|
#define WXDLL_ENTRY_FUNCTION() \
|
|
extern "C" WXEXPORT const wxClassInfo *wxGetClassFirst(); \
|
|
const wxClassInfo *wxGetClassFirst() { \
|
|
return wxClassInfo::GetFirst(); \
|
|
}
|
|
|
|
#endif // wxUSE_DYNLIB_CLASS
|
|
|
|
#endif // _WX_DYNLIB_H__
|