C++ NextItem函数代码示例

void DBVPolyIF::FourColoring ()

	{
	char nameStr [DBStringLength];
	DBInt symbol, maxSymbol = 0, line, index;
	DBObjRecord *polyRec,*searchPoly, *neighborPolyRec, *lineRec, *symRec;

 	for (polyRec = FirstItem ();polyRec != (DBObjRecord *) NULL;polyRec = NextItem ())
 		SymbolFLD->Record (polyRec,(DBObjRecord *) NULL);
	ListSort (LineNumFLD);
 	for (searchPoly = FirstItem ();searchPoly != (DBObjRecord *) NULL;searchPoly = NextItem ())
 		{
 		if (((DBInt) (SymbolFLD->Record (searchPoly) - (DBObjRecord *) NULL)) != 0) continue;
 		DBPause (searchPoly->RowID () * 100 / ItemNum ());
 		symbol = 1;
Restart:
 		for (polyRec = ItemTable->First (&index);polyRec != (DBObjRecord *) NULL;polyRec = ItemTable->Next (&index))
 			{
 			if (strcmp (polyRec->Name (),searchPoly->Name ()) != 0) continue;
 			lineRec = FirstLine (polyRec);
 			for (line = 0;line <= LineNum (polyRec);++line)
				{
				if (LineRightPoly (lineRec) == polyRec)
					{
					neighborPolyRec = LineLeftPoly (lineRec);
					lineRec = LineNextLine (lineRec);
					}
				else
					{
					neighborPolyRec = LineRightPoly (lineRec);
					lineRec = LinePrevLine (lineRec);
					}
				if (neighborPolyRec == (DBObjRecord *) NULL) continue;
				if (SymbolFLD->Record (neighborPolyRec) == (DBObjRecord *) symbol)
					{ symbol++; goto Restart; }
				}
			}
 		for (polyRec = ItemTable->First (&index);polyRec != (DBObjRecord *) NULL;polyRec = ItemTable->Next (&index))
 			if (strcmp (polyRec->Name (),searchPoly->Name ()) == 0) SymbolFLD->Record (polyRec,(DBObjRecord *) symbol);
		maxSymbol = maxSymbol > symbol ? maxSymbol : symbol;
		}
	while (maxSymbol < SymbolTable->ItemNum ()) SymbolTable->Remove (SymbolTable->ItemNum () - 1);
	while (maxSymbol > SymbolTable->ItemNum ()) SymbolTable->Add ();
	for (symbol = 0;symbol < SymbolTable->ItemNum ();++symbol)
		{
		symRec = SymbolTable->Item (symbol);
		sprintf (nameStr,"Symbol:%2d",symbol);
		symRec->Name (nameStr);
		StyleFLD->Int (symRec,0);
		ForegroundFLD->Int (symRec,1);
		BackgroundFLD->Int (symRec,0);
		}
 	for (polyRec = FirstItem ();polyRec != (DBObjRecord *) NULL;polyRec = NextItem ())
 		SymbolFLD->Record (polyRec,SymbolTable->Item ((DBInt) (SymbolFLD->Record (polyRec) - (DBObjRecord *) NULL) - 1));
	ListReset ();
	}

/*************************************************************************
 *      @	[SHLWAPI.21]
 *
 * Remove an item from a DataBlock list.
 *
 * PARAMS
 *  lppList [O] List to remove the item from
 *  ulId    [I] Id of item to remove
 *
 * RETURNS
 *  Success: TRUE.
 *  Failure: FALSE, If any parameters are invalid, or the item was not found.
 *
 * NOTES
 *  See SHWriteDataBlockList.
 */
BOOL WINAPI SHRemoveDataBlock(LPSHLWAPI_CLIST* lppList, ULONG ulId)
{
  LPSHLWAPI_CLIST lpList = 0;
  LPSHLWAPI_CLIST lpItem = NULL;
  LPSHLWAPI_CLIST lpNext;
  ULONG ulNewSize;

  TRACE("(%p,%ld)\n", lppList, ulId);

  if(lppList && (lpList = *lppList))
  {
    /* Search for item in list */
    while (lpList->ulSize)
    {
      if(lpList->ulId == ulId ||
        (lpList->ulId == CLIST_ID_CONTAINER && lpList[1].ulId == ulId))
      {
        lpItem = lpList; /* Found */
        break;
      }
      lpList = NextItem(lpList);
    }
  }

  if(!lpItem)
    return FALSE;

  lpList = lpNext = NextItem(lpItem);

  /* Locate the end of the list */
  while (lpList->ulSize)
    lpList = NextItem(lpList);

  /* Resize the list */
  ulNewSize = LocalSize((HLOCAL)*lppList) - lpItem->ulSize;

  /* Copy following elements over lpItem */
  memmove(lpItem, lpNext, (char *)lpList - (char *)lpNext + sizeof(ULONG));

  if(ulNewSize <= sizeof(ULONG))
  {
    LocalFree((HLOCAL)*lppList);
    *lppList = NULL; /* Removed the last element */
  }
  else
  {
    lpList = (LPSHLWAPI_CLIST)LocalReAlloc((HLOCAL)*lppList, ulNewSize,
                                           LMEM_ZEROINIT|LMEM_MOVEABLE);
    if(lpList)
      *lppList = lpList;
  }
  return TRUE;
}

/*************************************************************************
 *      @	[SHLWAPI.21]
 *
 * Remove an item from a DataBlock list.
 *
 * PARAMS
 *  lppList     [O] List to remove the item from
 *  dwSignature [I] Id of item to remove
 *
 * RETURNS
 *  Success: TRUE.
 *  Failure: FALSE, If any parameters are invalid, or the item was not found.
 *
 * NOTES
 *  See SHWriteDataBlockList.
 */
BOOL WINAPI SHRemoveDataBlock(LPDBLIST* lppList, DWORD dwSignature)
{
  LPDATABLOCK_HEADER lpList = 0;
  LPDATABLOCK_HEADER lpItem = NULL;
  LPDATABLOCK_HEADER lpNext;
  ULONG ulNewSize;

  TRACE("(%p,%d)\n", lppList, dwSignature);

  if(lppList && (lpList = *lppList))
  {
    /* Search for item in list */
    while (lpList->cbSize)
    {
      if(lpList->dwSignature == dwSignature ||
        (lpList->dwSignature == CLIST_ID_CONTAINER && lpList[1].dwSignature == dwSignature))
      {
        lpItem = lpList; /* Found */
        break;
      }
      lpList = NextItem(lpList);
    }
  }

  if(!lpItem)
    return FALSE;

  lpList = lpNext = NextItem(lpItem);

  /* Locate the end of the list */
  while (lpList->cbSize)
    lpList = NextItem(lpList);

  /* Resize the list */
  ulNewSize = LocalSize(*lppList) - lpItem->cbSize;

  /* Copy following elements over lpItem */
  memmove(lpItem, lpNext, (char *)lpList - (char *)lpNext + sizeof(ULONG));

  if(ulNewSize <= sizeof(ULONG))
  {
    LocalFree(*lppList);
    *lppList = NULL; /* Removed the last element */
  }
  else
  {
    lpList = LocalReAlloc(*lppList, ulNewSize, LMEM_ZEROINIT|LMEM_MOVEABLE);
    if(lpList)
      *lppList = lpList;
  }
  return TRUE;
}

uint32 mhmakefileparser::CreateEnvMd5_32() const
{
  md5_context ctx;
  string Md5;
  string EnvVars=ExpandVar(USED_ENVVARS);
  const char *pTmp=EnvVars.c_str();

  // Now create the md5 string
  md5_starts( &ctx );

  DBGOUT(cout << "MD5 of " << m_MakeDir->GetQuotedFullFileName() << endl);

  while (*pTmp)
  {
    string Var;
    pTmp=NextItem(pTmp,Var,";");
    if (!SkipVar(Var))
    {
      string Val=ExpandVar(Var);
      transform(Val.begin(),Val.end(),Val.begin(),(int(__CDECL *)(int))toupper);
      DBGOUT(cout << GetMakeDir()->GetQuotedFullFileName() << " -> Setting GetFromEnv var " << Var << " to " << Val << endl);
      md5_update( &ctx, (uint8 *) Var.c_str(), (unsigned long)Var.size());
      md5_update( &ctx, (uint8 *) "=", 1);
      md5_update( &ctx, (uint8 *) Val.c_str(), (unsigned long)Val.size());
    }
  }

  return md5_finish32( &ctx);
}

bool mhmakefileparser::SkipHeaderFile(const string &FileName)
{
  if (!m_SkipHeadersInitialized)
  {
    m_SkipHeadersInitialized=true;
    string HeadersToSkip=ExpandVar(SKIPHEADERS);
    const char *pTmp=HeadersToSkip.c_str();
    while (*pTmp)
    {
      string Item;
      pTmp=NextItem(pTmp,Item);
      if (Item.find('%')==string::npos)
      {
        m_SkipHeaders.insert(Item);
      }
      else
      {
        m_PercentHeaders.push_back(Item);
      }
    }
  }
  if (m_SkipHeaders.find(FileName)!=m_SkipHeaders.end())
    return true;

  vector<string>::const_iterator It=m_PercentHeaders.begin();
  vector<string>::const_iterator ItEnd=m_PercentHeaders.end();
  while (It!=ItEnd)
  {
    if (PercentMatch(FileName,*It++))
      return true;
  }

  return false;
}

DBObjRecord *DBVectorIF::Item (DBCoordinate coord) const

	{
	DBObjRecord *record, *retRecord = (DBObjRecord *) NULL;

	switch (DataPTR->Type ())
		{
		case DBTypeVectorPoint:
			{
			DBFloat dist, minDist = DBHugeVal;
			DBObjTableField *coordFLD  = ItemTable->Field (DBrNCoord);
			DBMathDistanceFunction distFunc =  DBMathGetDistanceFunction (DataPTR);
			
			for (record = FirstItem ();record != (DBObjRecord *) NULL;record = NextItem ())
				{
				dist = DBMathCoordinateDistance (distFunc,coord,coordFLD->Coordinate (record));
				if (dist < minDist) { minDist = dist; retRecord = record; }
				}
			} break;
		case DBTypeVectorLine:		break;
		case DBTypeVectorPolygon:	break;
		default: CMmsgPrint (CMmsgAppError, "Unknown Vector Data Type in: %s %d",__FILE__,__LINE__); break;
		}
	return (retRecord);
	}

    bool OnKey(IInputProvider* pprovider, const KeyState& ks, bool& fForceTranslate)
    {
        VerifyScrollPos();

        if (ks.bDown) {
            switch (ks.vk) {
                case VK_DOWN:
                    NextItem();
                    SelectionChanged();
                    return true;

                case VK_UP:
                    PreviousItem();
                    SelectionChanged();
                    return true;
                
                case VK_PRIOR:      // page up
                    PageUp();
                    SelectionChanged();
                    return true;

                case VK_NEXT:       // page down
                    PageDown();
                    SelectionChanged();
                    return true;
            }
        }

        return false;
    }

void CMenuState::HandleEvents(CGameEngine* game)
{
	ALLEGRO_EVENT ev;
	
	// wait for an event (mouse movement, key press, etc.)
	al_wait_for_event(game->event_queue, &ev);

	switch(ev.type) {
	case ALLEGRO_EVENT_DISPLAY_CLOSE:
		game->Quit();
		break;

	case ALLEGRO_EVENT_KEY_DOWN:
		if(ev.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
			game->Quit();

		else if(ev.keyboard.keycode == ALLEGRO_KEY_RIGHT)
			NextItem();

		else if(ev.keyboard.keycode == ALLEGRO_KEY_LEFT)
			PrevItem();

		else if(ev.keyboard.keycode == ALLEGRO_KEY_ENTER || ev.keyboard.keycode == ALLEGRO_KEY_SPACE)
			items[menuIndex]->Activate(game);

		break;
	}
}

 void PageDown()
 {
     int delta = GetSignificantSize() / GetSignificantSize(*m_ppainter);
     while (delta > 0) {
         NextItem();
         delta--;
     }
 }

static bool Next( playlist_t *p_playlist )
{
    playlist_item_t *p_item = NextItem( p_playlist );
    if( p_item == NULL )
        return false;

    msg_Dbg( p_playlist, "starting playback of new item" );
    ResyncCurrentIndex( p_playlist, p_item );
    return PlayItem( p_playlist, p_item );
}

static void LoopRequest( playlist_t *p_playlist )
{
    playlist_private_t *p_sys = pl_priv(p_playlist);
    assert( !p_sys->p_input );

    /* No input. Several cases
     *  - No request, running status -> start new item
     *  - No request, stopped status -> collect garbage
     *  - Request, running requested -> start new item
     *  - Request, stopped requested -> collect garbage
    */
    const int i_status = p_sys->request.b_request ?
                         p_sys->request.i_status : p_sys->status.i_status;

    if( i_status == PLAYLIST_STOPPED || !vlc_object_alive( p_playlist ) )
    {
        p_sys->status.i_status = PLAYLIST_STOPPED;

        if( p_sys->p_input_resource &&
            input_resource_HasVout( p_sys->p_input_resource ) )
        {
            /* XXX We can unlock if we don't issue the wait as we will be
             * call again without anything else done between the calls */
            PL_UNLOCK;

            /* input_resource_t must be manipulated without playlist lock */
            input_resource_TerminateVout( p_sys->p_input_resource );

            PL_LOCK;
        }
        else
        {
            if( vlc_object_alive( p_playlist ) )
                vlc_cond_wait( &p_sys->signal, &p_sys->lock );
        }
        return;
    }

    playlist_item_t *p_item = NextItem( p_playlist );
    if( p_item )
    {
        msg_Dbg( p_playlist, "starting playback of the new playlist item" );
        PlayItem( p_playlist, p_item );
        return;
    }

    msg_Dbg( p_playlist, "nothing to play" );
    p_sys->status.i_status = PLAYLIST_STOPPED;

    if( var_GetBool( p_playlist, "play-and-exit" ) )
    {
        msg_Info( p_playlist, "end of playlist, exiting" );
        libvlc_Quit( p_playlist->p_libvlc );
    }
}

    MouseResult Button(
        IInputProvider* pprovider,
        const Point& point,
        int button,
        bool bCaptured,
        bool bInside,
        bool bDown
    ) {
        VerifyScrollPos();

        if (button == 0 && bDown) {
            int nSize = GetSignificantSize(*m_ppainter);

            int nSignificantMouseDim = (int)(m_bHorizontal ? point.X(): point.Y());

            SetSelection(m_plist->GetItem((nSignificantMouseDim + GetScrollPos()) / nSize));

            NeedPaint();

            SelectionChanged();
            if (pprovider->IsDoubleClick()) {
                m_peventDoubleClick->Trigger();
            }
            else {
                m_peventSingleClick->Trigger();
            }

        }
		else if(button == 1 && bDown)
		{
			int nSize = GetSignificantSize(*m_ppainter);

            int nSignificantMouseDim = (int)(m_bHorizontal ? point.X(): point.Y());

            SetSelection(m_plist->GetItem((nSignificantMouseDim + GetScrollPos()) / nSize));

            NeedPaint();

            SelectionChanged();
            if (pprovider->IsDoubleClick()) {
                m_peventDoubleRightClick->Trigger();
            }
            else {
                m_peventSingleRightClick->Trigger();
            }
		} else if(button == 8 && bDown) { //Imago 8/14/09 mouse wheel
            NextItem();
            SelectionChanged();
        } else if(button == 9 && bDown) {
            PreviousItem();
            SelectionChanged();
        }

        return MouseResult();
    }

CObject*			Search::FindNextObjectOfType( void )
{
	

	CObject*	obj = NextItem();

	while ( obj )
	{
		Dbg_AssertType( obj, CObject );
	
		if ( obj->GetType() == obj_type )
		{
			return obj;
		}
			
		obj = NextItem();
	}
	
	return obj;
}

/*****************************************************************************
 *
 *  casesin takes a list of selections 'tptr' and returns the number of
 *          distinct selections (including an ELSE if one present).
 *
 *****************************************************************************/
PRIVATE int casesin (treenode * tptr)
{
	int n = 0;
	for (; !EndOfList (tptr); tptr = NextItem (tptr)) {
		treenode *thisguard = CondGuardOf (skipspecifications (ThisItem (tptr)));
		if (TagOf (thisguard) == S_ELSE)
			n++;
		else
			n += listitems (thisguard);
	}
	return (n);
}

long
DCirfile::GetItemCount(void)
{
	long count = 0;

	while (NextItem())
		count++;

	Section(CurrSectName);

	return count;
}