Method loadLibrary

src_cpp/yaafe-core/ComponentFactory.cpp:137–195

  }

  int ComponentFactory::loadLibrary(const std::string& libnamestr) {

    if (m_libs.find(libnamestr)!=m_libs.end())
    {
      // library already loaded
      return 0;
    }

    std::string complete_name = "lib" + libnamestr + YAAFE_DYNLIB_EXTENSION;

    // first look at YAAFE_LIBRARY_DIR
    if (getenv("YAAFE_PATH"))
      {
	string tmp = string(getenv("YAAFE_PATH")) + string(YAAFE_PATH_SEPARATOR) + complete_name;
	struct stat st;
	if (stat(tmp.c_str(),&st)==0)
	  {
	    // file exists
	    complete_name = tmp;
	  }
      }
    
    // then look at VIRTUAL_ENV/lib
    if (getenv("VIRTUAL_ENV"))
      {
	string tmp = string(getenv("VIRTUAL_ENV")) + string(YAAFE_PATH_SEPARATOR) + string("lib") + string(YAAFE_PATH_SEPARATOR) + complete_name;
	struct stat st;
	if (stat(tmp.c_str(),&st)==0)
	  {
	    // file exists
	    complete_name = tmp;
	  }
      } // else look at library in default library accessible dirs
    
    const char* libname = complete_name.c_str();
    LIBRARY_HANDLER library = dlopen(libname, RTLD_LAZY);
    if (library == NULL) {
      cerr << "ERROR: cannot load yaafe component library \"" << libname << "\" !" << endl;
      cerr << dlerror() << endl;
      return -1;
    }

    void* initializer = dlsym(library, "registerYaafeComponents");
    if (initializer == NULL) {
      cerr << "ERROR: cannot find 'registerYaafeComponents' function in component library '" << libname << "' !" << endl;
      dlclose(library);
      return -2;
    }

    m_libs[libnamestr] = library;

    typedef void (*yaafelib_register_function_type)(void*);
    yaafelib_register_function_type func =
      *((yaafelib_register_function_type*) (&initializer));

    func((void*) this);

    return 0;