C++ do_callback函数代码示例

/****************
 * We have read in all header lines and are about to receive the body
 * part.  The delimiter line has already been processed.
 *
 * FIXME: we's better return an error in case of memory failures.
 */
static int
transition_to_body (rfc822parse_t msg)
{
  rfc822parse_field_t ctx;
  int rc;

  rc = do_callback (msg, RFC822PARSE_T2BODY);
  if (!rc)
    {
      /* Store the boundary if we have multipart type. */
      ctx = rfc822parse_parse_field (msg, "Content-Type", -1);
      if (ctx)
        {
          const char *s;

          s = rfc822parse_query_media_type (ctx, NULL);
          if (s && !strcmp (s,"multipart"))
            {
              s = rfc822parse_query_parameter (ctx, "boundary", 0);
              if (s)
                {
                  assert (!msg->current_part->boundary);
                  msg->current_part->boundary = malloc (strlen (s) + 1);
                  if (msg->current_part->boundary)
                    {
                      part_t part;

                      strcpy (msg->current_part->boundary, s);
                      msg->boundary = msg->current_part->boundary;
                      part = new_part ();
                      if (!part)
                        {
                          int save_errno = errno;
                          rfc822parse_release_field (ctx);
                          errno = save_errno;
                          return -1;
                        }
                      rc = do_callback (msg, RFC822PARSE_LEVEL_DOWN);
                      assert (!msg->current_part->down);
                      msg->current_part->down = part;
                      msg->current_part = part;
                      msg->in_preamble = 1;
                    }
                }
            }
          rfc822parse_release_field (ctx);
        }
    }

  return rc;
}

//回调函数，第三个参数为NULL，不使用
void GetRuleTask::done_get_new_rule(void *req , RET_TYPE type , void *data)
{
    MsgHeader header;
    InReq *cb_req = NULL;

    //如果SCAgent执行失败，不再执行接下来的操纵，回调上层的回调函数，
    //当然还可以使用其它的设置，例如重试多次等
    if(Task::parse_callback_ret(req , type) < 0)
    {
        goto ERR ;
    }

    cb_req = (InReq *)req;
    header = cb_req->m_msgHeader;
    //检查回复的报文的cmd字段是否符合定义，如果出错也不会执行接下来的操作
    if(MU_RULER == m_type && MSG_RS_CS_UPDATE_MU_HASH_ACK != header.cmd)
    {
        LOG_ERROR("GetRuleTask::Undefined mu ack header cmd : " + int_to_str(header.cmd));
        goto ERR ;
    }
    if(SU_RULER == m_type && MSG_RS_CS_UPDATE_SU_HASH_ACK != header.cmd)
    {
        LOG_ERROR("GetRuleTask::Undefined su ack header cmd : " + int_to_str(header.cmd));
        goto ERR ;
    }

    //这里需要保证原子性！
    if(get_new_rule_ack(cb_req) < 0)
    {
        LOG_ERROR("GetRuleTask::Parse new rule from CS error !");
        goto ERR ;
    }
    
    //每次更新报文之后都需要唤醒所有等待的客户端
    if(m_is_wait_client)
    {
        wakeup_all_wait_request();
    }
    //唤醒之后就可以执行回调了
    do_callback(true);

ERR :
    //这里可以使用其他的方式处理操作失败的情况，或者对不同的失败情况执行不同的操作
    //这里仅仅是回调上层执行失败
    if(m_is_wait_client)
    {
        wakeup_all_wait_request();
    }
    do_callback(false);
}

int orb_mapctrl::handle(int event) 
{
    switch (event) {
        case FL_MOVE:
            m_mousepos.set_x(Fl::event_x()-x());
            m_mousepos.set_y(Fl::event_y()-y());
            return 1;
        case FL_ENTER:
            fl_cursor(FL_CURSOR_HAND);
            return 1;
        case FL_LEAVE:
            fl_cursor(FL_CURSOR_DEFAULT);
            return 1;
        case FL_PUSH:
            if (Fl::event_button() == FL_RIGHT_MOUSE)
              do_callback();
            return 1;
        case FL_RELEASE: 
            return 1;
        case FL_DRAG: 
            {
                if (!Fl::event_inside(this))
                    break;

                int dx = m_mousepos.get_x() - (Fl::event_x()-x());
                int dy = m_mousepos.get_y() - (Fl::event_y()-y());
                m_mousepos.set_x(Fl::event_x()-x());
                m_mousepos.set_y(Fl::event_y()-y());

                m_viewport->move(dx, dy); 
                redraw();

                return 1;
            }
        case FL_MOUSEWHEEL:
            if (!Fl::event_inside(this))
                break;

            // Prevent integer underflow
            if ((Fl::event_dy() > 0) && (m_viewport->z() == 0))
                return 1;

            // The image of the viewport might be smaller then our current
            // client area. We need to take this delta into account.
            int dpx = 0, dpy = 0;
            if (w() > (int)m_viewport->w())
                dpx = (w() - (int)m_viewport->w())/2;
            if (h() > (int)m_viewport->h())
                dpy = (h() - (int)m_viewport->h())/2;

            int px = Fl::event_x()- x() - dpx;
            int py = Fl::event_y()- y() - dpy;

            m_viewport->z(m_viewport->z()-Fl::event_dy(), px, py);
            redraw();
            return 1;
    }

    return Fl_Widget::handle(event);
}

int Fl_Envelope::handle(int event)
{
	int ret=Fl_Group::handle(event);

	// search for deleted handles
	for(list<Fl_Handle*>::iterator i = m_HandleList.begin();
		i!=m_HandleList.end(); ++i)
	{
		// if it's been modified, update the env via the callback
		if ((*i)->Changed()) do_callback();
	
		if ((*i)->Deleted())
		{
			remove(*i);
			m_HandleList.erase(i);
			break; // one at a time
		}
	}

	if (!ret)
	{
		int Mousebutton=Fl::event_button();
		if (event==FL_PUSH && Mousebutton==2)
		{
			Fl_Handle * newhandle = new 
				Fl_Handle(Fl::event_x()-5,Fl::event_y()-5,10,10,"");
			m_HandleList.push_back(newhandle);
			add(newhandle);		
		}
				
		redraw();
	}	
	
	return ret;
}

void EnvelopeFreeEdit::OSC_raw(const char *msg)
{
    const char *args = rtosc_argument_string(msg);
    if(strstr(msg,"Penvpoints") && !strcmp(args, "i")) {
        Penvpoints = rtosc_argument(msg, 0).i;
    } else if(strstr(msg,"Penvdt") && !strcmp(args, "b")) {
        rtosc_blob_t b = rtosc_argument(msg, 0).b;
        assert(b.len == MAX_ENVELOPE_POINTS);
        memcpy(Penvdt, b.data, MAX_ENVELOPE_POINTS);
    } else if(strstr(msg,"Penvval") && !strcmp(args, "b")) {
        rtosc_blob_t b = rtosc_argument(msg, 0).b;
        assert(b.len == MAX_ENVELOPE_POINTS);
        memcpy(Penvval, b.data, MAX_ENVELOPE_POINTS);
    } else if(strstr(msg, "Penvval") && !strcmp(args, "c")) {
        const char *str = strstr(msg, "Penvval");
        int id = atoi(str+7);
        assert(0 <= id && id < MAX_ENVELOPE_POINTS);
        Penvval[id] = rtosc_argument(msg, 0).i;
    } else if(strstr(msg, "Penvdt") && !strcmp(args, "c")) {
        const char *str = strstr(msg, "Penvdt");
        int id = atoi(str+6);
        assert(0 <= id && id < MAX_ENVELOPE_POINTS);
        Penvdt[id] = rtosc_argument(msg, 0).i;
    } else if(strstr(msg,"Penvsustain") && !strcmp(args, "i")) {
        Penvsustain = rtosc_argument(msg, 0).i;
    }
    redraw();
    do_callback();
}

void gdMidiOutputMidiCh::__cb_close() {
	ch->midiOut     = enableOut->value();
	ch->midiOutChan = chanListOut->value();
	ch->midiOutL    = enableLightning->value();
	ch->guiChannel->update();
	do_callback();
}

/****************
 * Add header lines to the existing ones.
 * Such a line may include LFs which are used to split the line
 * int several fields.	This must be a valid header line.
 */
int
rfc822_add_header( RFC822 msg, const char *line )
{
    HDR_LINE hdr;
    const char *lf;
    size_t n;
    int do_cb;

    /* send the notification only if we have not processed all header lines */
    do_cb = !msg->in_body && strlen(line) >= 9 && !memicmp(line, "Received:", 9);

    do {
        lf = strchr( line, '\n' );
        n = lf? ( lf - line ) : strlen( line );
        hdr = malloc( sizeof( *hdr ) + n );
        if( !hdr )
            return RFC822ERR_NOMEM;
        hdr->next = NULL;
        hdr->cont = (*line == ' ' || *line == '\t');
        memcpy(hdr->line, line, n );
        hdr->line[n] = 0;

        *msg->hdr_lines_head = hdr;
        msg->hdr_lines_head = &hdr->next;
    } while( lf && *(line=lf+1) );

    if( do_cb )
        do_callback( msg, RFC822EVT_RCVD_SEEN );

    return 0;
}

/****************
 * Note: For program supplied (and therefore syntactically correct)
 *	 header lines, rfc822_add_header() may be used.
 */
int
insert_header( RFC822 msg, char *line, size_t length )
{
    HDR_LINE hdr;

    if( !length ) {
        msg->in_body = 1;
        return transition_to_body(msg);
    }
    trim_trailing_spaces(line);
    /* Hmmm: should we check for invalid header data here? */

    hdr = malloc( sizeof( *hdr ) + strlen(line) );
    if( !hdr )
        return RFC822ERR_NOMEM;
    hdr->next = NULL;
    hdr->cont = (*line == ' ' || *line == '\t');
    strcpy(hdr->line, line );

    *msg->hdr_lines_head = hdr;
    msg->hdr_lines_head = &hdr->next;

    /* lets help the caller to prevent mail loops
     * It is okay to use length here, also this value
     * not correct due to the space trimming */
    if( length >= 9 && !memicmp(line, "Received:", 9) )
        do_callback( msg, RFC822EVT_RCVD_SEEN );
    return 0;
}

void
rfc822_close( RFC822 msg )
{
    do_callback( msg, RFC822EVT_CLOSE );
    release_handle_data( msg );
    free(msg);
}

void
rfc822_cancel( RFC822 msg )
{
    do_callback( msg, RFC822EVT_CANCEL );
    release_handle_data( msg );
    free(msg);
}

void gdBeatsInput::__cb_update_batt()
{
	if (!strcmp(beats->value(), "") || !strcmp(bars->value(), ""))
		return;
	glue_setBeats(atoi(beats->value()), atoi(bars->value()), resizeRec->value());
	do_callback();
}

/**
 * @brief Updates all timers currently running for this script.
 */
void LuaContext::update_timers() {

  // Update all timers.
  std::map<Timer*, LuaTimerData>::iterator it;
  for (it = timers.begin(); it != timers.end(); ++it) {

    Timer* timer = it->first;
    timer->update();
    if (timer->is_finished()) {
      do_callback(it->second.callback_ref);
      it->second.callback_ref = LUA_REFNIL;
      timers_to_remove.push_back(timer);
    }
  }

  // Destroy the ones that should be removed.
  std::list<Timer*>::iterator it2;
  for (it2 = timers_to_remove.begin(); it2 != timers_to_remove.end(); ++it2) {

    Timer* timer = *it2;
    if (timers.find(timer) != timers.end()) {
      if (!timer->is_finished()) {
        cancel_callback(timers[timer].callback_ref);
      }
      timers.erase(timer);
      timer->decrement_refcount();
      if (timer->get_refcount() == 0) {
        delete timer;
      }
    }
  }
  timers_to_remove.clear();
}

/*
 * FIXME: icon will loose focus if is selected then press OK, which will take focus from it.
 * In this case, nothing will be returned; double-click works as expected.
 */
int IconBox::handle(int event) {
	switch(event) {
		case FL_FOCUS:
			corig = color();
			color(selection_color());
			redraw();
			sel = true;
			return 1;
		case FL_UNFOCUS:
			color(corig);
			redraw();
			sel = false;
			return 1;
		case FL_PUSH:
			take_focus();
			// double-click
			if(Fl::event_clicks())
				do_callback();
			return 1;
		case FL_RELEASE:
			return 1;
		default:
			return Fl_Button::handle(event);
	}
	return 1;
}

// When user picks a menu item, call this.  It will do the callback.
// Unfortunatly this also casts away const for the checkboxes, but this
// was necessary so non-checkbox menus can really be declared const...
const MenuItem* MenuBase::picked(const MenuItem* v) {
  if (v) {
    if (v->radio()) {
      if (!v->value()) { // they are turning on a radio item
	set_changed();
	((MenuItem*)v)->setonly();
      }
      redraw();
    } else if (v->flags & FL_MENU_TOGGLE) {
      set_changed();
      ((MenuItem*)v)->flags ^= FL_MENU_VALUE;
      redraw();
    } else if (v != value_) { // normal item
      set_changed();
    }
    value_ = v;
    if (when()&(FL_WHEN_CHANGED|FL_WHEN_RELEASE)) {
      if (changed() || when()&FL_WHEN_NOT_CHANGED) {
	if (value_ && value_->callback_) value_->do_callback((Fl_Widget*)this);
	else do_callback();
      }
    }
  }
  return v;
}

int IndicatorWindow::handle(int iEvent)
{
	switch (iEvent) {
	case FL_PUSH:
		switch (Fl::event_button()) {
		case 1: // left button
			{
				// find the indicator and move the floating indicator there
				int x = Fl::event_x();
				float fIndicator = findIndicator(x, 5);
				if (fIndicator != ks_fIndicatorNotFound) {
					floatingIndicator(fIndicator);
					redraw();
				}
			}
			break;
		}
		return 1;

	case FL_RELEASE:
		switch (Fl::event_button()) {
		case 1: // left button
			// do the callback function so that the parent can update other
			// widgets accordingly
			do_callback();
			break;
		}
		return 1;

	default:
		break;
	}

	return Fl_Double_Window::handle(iEvent);
}