text: //
  // SharedLibrary.h
  //
  // $Id: //poco/1.4/Foundation/include/Poco/SharedLibrary.h#3 $
  //
  // Library: Foundation
  // Package: SharedLibrary
  // Module:  SharedLibrary
  //
  // Definition of the SharedLibrary class.
  //
  // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
  // and Contributors.
  //
  // Permission is hereby granted, free of charge, to any person or organization
  // obtaining a copy of the software and accompanying documentation covered by
  // this license (the "Software") to use, reproduce, display, distribute,
  // execute, and transmit the Software, and to prepare derivative works of the
  // Software, and to permit third-parties to whom the Software is furnished to
  // do so, all subject to the following:
  // 
  // The copyright notices in the Software and this entire statement, including
  // the above license grant, this restriction and the following disclaimer,
  // must be included in all copies of the Software, in whole or in part, and
  // all derivative works of the Software, unless such copies or derivative
  // works are solely in the form of machine-executable object code generated by
  // a source language processor.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
  // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
  // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  // DEALINGS IN THE SOFTWARE.
  //
  
  
  #ifndef Foundation_SharedLibrary_INCLUDED
  #define Foundation_SharedLibrary_INCLUDED
  
  
  #include "Poco/Foundation.h"
  
  
  #if defined(hpux) || defined(_hpux)
  #include "Poco/SharedLibrary_HPUX.h"
  #elif defined(POCO_VXWORKS)
  #include "Poco/SharedLibrary_VX.h"
  #elif defined(POCO_OS_FAMILY_UNIX)
  #include "Poco/SharedLibrary_UNIX.h"
  #elif defined(POCO_OS_FAMILY_WINDOWS) && defined(POCO_WIN32_UTF8)
  #include "Poco/SharedLibrary_WIN32U.h"
  #elif defined(POCO_OS_FAMILY_WINDOWS)
  #include "Poco/SharedLibrary_WIN32.h"
  #elif defined(POCO_OS_FAMILY_VMS)
  #include "Poco/SharedLibrary_VMS.h"
  #endif
  
  
  namespace Poco {
  
  
  class Foundation_API SharedLibrary: private SharedLibraryImpl
  	/// The SharedLibrary class dynamically 
  	/// loads shared libraries at run-time.
  {
  public:
  	enum Flags
  	{
  		SHLIB_GLOBAL = 1,
  			/// On platforms that use dlopen(), use RTLD_GLOBAL. This is the default
  			/// if no flags are given.
  			///
  			/// This flag is ignored on platforms that do not use dlopen().
  
  		SHLIB_LOCAL  = 2  
  			/// On platforms that use dlopen(), use RTLD_LOCAL instead of RTLD_GLOBAL.
  			///
  			/// Note that if this flag is specified, RTTI (including dynamic_cast and throw) will
  			/// not work for types defined in the shared library with GCC and possibly other
  			/// compilers as well. See http://gcc.gnu.org/faq.html#dso for more information.
  			///
  			/// This flag is ignored on platforms that do not use dlopen().
  	};
  	
  	SharedLibrary();
  		/// Creates a SharedLibrary object.
  		
  	SharedLibrary(const std::string& path);
  		/// Creates a SharedLibrary object and loads a library
  		/// from the given path.
  
  	SharedLibrary(const std::string& path, int flags);
  		/// Creates a SharedLibrary object and loads a library
  		/// from the given path, using the given flags. 
  		/// See the Flags enumeration for valid values.
  
  	virtual ~SharedLibrary();
  		/// Destroys the SharedLibrary. The actual library
  		/// remains loaded.
  
  	void load(const std::string& path);
  		/// Loads a shared library from the given path.
  		/// Throws a LibraryAlreadyLoadedException if
  		/// a library has already been loaded.
  		/// Throws a LibraryLoadException if the library
  		/// cannot be loaded.
  
  	void load(const std::string& path, int flags);
  		/// Loads a shared library from the given path,
  		/// using the given flags. See the Flags enumeration
  		/// for valid values.
  		/// Throws a LibraryAlreadyLoadedException if
  		/// a library has already been loaded.
  		/// Throws a LibraryLoadException if the library
  		/// cannot be loaded.
  
  	void unload();
  		/// Unloads a shared library.
  
  	bool isLoaded() const;
  		/// Returns true iff a library has been loaded.
  
  	bool hasSymbol(const std::string& name);
  		/// Returns true iff the loaded library contains
  		/// a symbol with the given name.
  
  	void* getSymbol(const std::string& name);
  		/// Returns the address of the symbol with
  		/// the given name. For functions, this
  		/// is the entry point of the function.
  		/// Throws a NotFoundException if the symbol
  		/// does not exist.
  		
  	const std::string& getPath() const;
  		/// Returns the path of the library, as
  		/// specified in a call to load() or the 
  		/// constructor.
  		
  	static std::string suffix();
  		/// Returns the platform-specific filename suffix
  		/// for shared libraries (including the period).
  		/// In debug mode, the suffix also includes a
  		/// "d" to specify the debug version of a library.
  		
  private:
  	SharedLibrary(const SharedLibrary&);
  	SharedLibrary& operator = (const SharedLibrary&);
  };
  
  
  } // namespace Poco
  
  
  #endif // Foundation_SharedLibrary_INCLUDED
  