ulocalrss.pas

自己写的一个 RSS 阅读器

unit uLocalRSS;

interface

uses Classes, uW3CDTF, FastStringFuncs, MSXML2_TLB,
  uConstants;

type

TLocalRssItem = class(TComponent)
  private
    FNode:IXMLDOMNode;
    FFeedTitle:string;
    FAuthor: string;
    FTitle: string;
    FPubDate: TW3CDTF;
    FGuid: WideString;
    FLink: WideString;
    FDescription: string;
    FCategory : string;
    FCommentCount : integer;
    FComment : Widestring;
    FCommentRss : Widestring;
    FCommentURL : Widestring;

    FReaded:Boolean;
  protected
    function Get_Author: string;
    function Get_Title: string;
    function Get_PubDate: TW3CDTF;
    function Get_Guid: WideString;
    function Get_Link: WideString;
    function Get_Category: string;
    function Get_Creator: WideString;
    function Get_CommentCount: integer;
    function Get_CommenTLocalRss: WideString;
    function Get_CommentURL: WideString;
    function Get_Comment: WideString;
    function Get_Description: string;

    procedure Set_PubDate(Value:TW3CDTF);
    procedure Set_Title(Value:string);
    procedure Set_Link(Value:WideString);
    procedure Set_Guid(Value:Widestring);
    procedure Set_Description(Value:string);
    procedure Set_Author(Value:string);
    procedure Set_Category(Value:string);
    procedure Set_Creator(Value:Widestring);
    procedure Set_Comment(Value:Widestring);
    procedure Set_CommentCount(Value:Integer);
    procedure Set_CommentURL(Value:Widestring);
    procedure Set_CommenTLocalRss(Value:Widestring);

    function Get_Readed:Boolean;
    procedure Set_Readed(Value:Boolean);
  public
		constructor Create(AOnwer:TComponent;theNode : IXmlDOMNode);
    property PubDate: TW3CDTF read Get_PubDate write Set_PubDate;
    property Title: string read Get_Title write Set_Title;
    property Link: WideString read Get_Link write Set_Link;
    property Guid: WideString read Get_Guid write Set_Guid;
    property Description: string read Get_Description write Set_Description;
    property Author: string read Get_Author write Set_Author;
    property Category: string read Get_Category write Set_Category;
    property Creator: WideString read Get_Creator write Set_Creator;
    property Comment: WideString read Get_Comment write Set_Comment;
    property CommentCount: integer read Get_CommentCount write Set_CommentCount;
    property CommentRss: WideString read Get_CommenTLocalRss write Set_CommenTLocalRss;

    property Readed:Boolean read Get_Readed write Set_Readed;
  end;

TLocalRssItems = class(TComponent)
private
  fItems : TList;
  fNode:IXMLDOMNode;
protected
  procedure Add(item : TObject);overload;

  function Get_Item(index : integer): TLocalRssItem;
  function Get_Count(): integer;

public
	constructor Create(AOnwer:TComponent;theNode:IXMLDOMNode);
  function IndexOfLink(ALink:WideString):integer;
  function IndexOfTitle(ATitle:String):integer;
  function Add:TLocalRssItem;overload;
  procedure Delete(Index:integer);overload;
  procedure Delete(Item:TLocalRssItem);overload;
  
  property Item[Index: Integer]: TLocalRssItem read Get_Item;
  property Count : integer read Get_Count;

end;

TLocalRSSImage = class(TComponent)
  private
    fNode:IXMLDOMNode;
    FTitle: WideString;
    FLink: WideString;
    FURL: WideString;
    FWidth: WideString;
    FHeight: WideString;
  protected
    { IRSSImageBase }
    function Get_Title: WideString;
    function Get_Link: WideString;
    function Get_URL: WideString;
    function Get_Width: WideString;
    function Get_Height: WideString;
    procedure Set_Title(Value:WideString);
    procedure Set_Link(Value:WideString);
    procedure Set_URL(Value:WideString);
    procedure Set_Width(Value:WideString);
    procedure Set_Height(Value:WideString);
  public
  	constructor Create(AOnwer:TComponent;theNode : IXMLDOMNode);
    property Title: WideString read Get_Title write Set_Title;
    property Link: WideString read Get_Link write Set_Link;
    property URL: WideString read Get_URL write Set_URL;
    property Width: WideString read Get_Width write Set_Width;
    property Height: WideString read Get_Height write Set_Height;
  end;

TLocalRssFeed = class(TComponent)
private
  FDoc:IXMLDOMDocument2;
  fNode:IXMLDOMNode;
	fItems : TLocalRssItems;
  FImage : TLocalRSSImage;
  FTitle, FDescription : string;
  FLastUpdate:TW3CDTF;
  FVersion, FLink, FCreator : WideString;
protected
  function Get_Version : WideString;
  function Get_Title : string;
  function Get_Link: WideString;
  function Get_Description: string;
  function Get_Creator: WideString;
  function Get_Items: TLocalRssItems;
  function Get_Image: TLocalRSSImage;
  function Get_LastUpdate:TW3CDTF;
  procedure Set_Title(Value:string);
  procedure Set_Version(Value:WideString);
  procedure Set_Link(Value:WideString);
  procedure Set_Description(Value:string);
  procedure Set_Creator(Value:WideString);
  procedure Set_LastUpdate(Value:TW3CDTF);
public
	constructor Create(AOnwer:TComponent;theDoc : IXMLDOMDocument2);
  procedure SaveXml(Destination: OleVariant);
  property Items:TLocalRssItems read fItems write fItems;
  property Image:TLocalRSSImage read FImage write FImage;
  property Version: WideString read Get_Version write Set_Version;
  property Title: string read Get_Title write Set_Title;
  property Link: Widestring read Get_Link write Set_Link;
  property Description: string read Get_Description write Set_Description;
  property Creator: WideString read Get_Creator write Set_Creator;
  property LastUpdate:TW3CDTF read Get_LastUpdate write Set_LastUpdate;
end;

function GetLocalRssFeed(AOnwer:TComponent;Doc: IXMLDOMDocument2): TLocalRssFeed;
function LoadRSSFeed(AOnwer:TComponent;FileName:WideString): TLocalRssFeed;

implementation

uses SysUtils, ComObj;

function GetLocalRssFeed(AOnwer:TComponent;Doc: IXMLDOMDocument2): TLocalRssFeed;
begin
  Result := TLocalRssFeed.Create(AOnwer,Doc);
end;

function LoadRSSFeed(AOnwer:TComponent;FileName:WideString): TLocalRssFeed;
var Doc:IXMLDOMDocument2;
begin
  if FileExists(FileName) then
  begin
    Doc:=CoDOMDocument.Create;
    Doc.load(FileName);
    Result := TLocalRssFeed.Create(AOnwer,Doc);
  end
  else Result:=nil;
end;

{ TLocalRssFeed }

constructor TLocalRssFeed.Create(AOnwer:TComponent;theDoc: IXMLDOMDocument2);
var
	i : integer;
  channelNodes : IXMLDOMNodeList;
  theNode: IXmlDomNode;
  sLastUpdate:string;
begin
  inherited Create(AOnwer);
  FDoc:=theDoc;
  theNode:= FDoc.documentElement;
	fNode := theNode.selectSingleNode('channel');
  fItems := TLocalRssItems.Create(Self,fnode);
  Fimage := TLocalRssImage.Create(Self,fnode.selectSingleNode('image'));

  FCreator := getNodeVal(fnode, 'creator');
 	FDescription := getNodeVal(fnode, 'description');
  FTitle := ExtractNonHTML(getNodeVal(fnode, 'title'));
  FLink := getNodeVal(fnode, 'link');
	FVersion := 'RSS ' + getNodeVal(thenode, '@version');

  sLastUpdate:=getNodeVal(fnode, 'lastUpdate');
  if sLastUpdate='' then
     FLastUpdate:=TW3CDTF.Create(DateTimeToStr(Now))
  else
    FLastUpdate:=TW3CDTF.Create(sLastUpdate);

  channelNodes := fnode.selectNodes('item');
  for i := 0 to channelNodes.Length - 1 do
    	fitems.Add( TLocalRssItem.Create(fItems,channelNodes.item[i]) );
end;

procedure TLocalRssFeed.SaveXml(Destination: OleVariant);
begin
  FDoc.save(Destination);
end;

function TLocalRssFeed.Get_Creator: WideString; begin Result := FCreator; end;
function TLocalRssFeed.Get_Description: string; begin Result := FDescription; end;
function TLocalRssFeed.Get_Image: TLocalRSSImage; begin Result := FImage; end;
function TLocalRssFeed.Get_Items: TLocalRssItems; begin Result := fItems; end;
function TLocalRssFeed.Get_Link: WideString; begin Result := FLink; end;
function TLocalRssFeed.Get_Title: string; begin Result := FTitle; end;
function TLocalRssFeed.Get_Version: WideString; begin Result := FVersion; end;
function TLocalRssFeed.Get_LastUpdate: TW3CDTF; begin Result := FLastUpdate; end;
procedure TLocalRssFeed.Set_Title(Value:string);
begin
  FTitle:=Value;
  SetNodeVal(fNode,'title',Value);
end;
procedure TLocalRssFeed.Set_Version(Value:WideString);
begin
  FVersion:=Value;
  SetNodeAttrVal(fNode.parentNode,'version',Value);
end;
procedure TLocalRssFeed.Set_Link(Value:WideString);
begin
  FLink:=Value;
  SetNodeVal(fNode,'link',Value);
end;
procedure TLocalRssFeed.Set_Description(Value:string);
begin
  FDescription:=Value;
  SetNodeVal(fNode,'description',Value);
end;
procedure TLocalRssFeed.Set_Creator(Value:WideString);
begin
  FCreator:=Value;
  SetNodeVal(fNode,'creator',Value);
end;
procedure TLocalRssFeed.Set_LastUpdate(Value:TW3CDTF);
begin
  FLastUpdate:=Value;
  SetNodeVal(fNode,'lastUpdate',FLastUpdate.ToRFC822String);
end;



{ TLocalRssItems }

constructor TLocalRssItems.Create(AOnwer:TComponent;theNode:IXMLDOMNode);
begin
  inherited Create(AOnwer);
  fNode:=theNode;
	fItems := TList.Create;
end;
function TLocalRssItems.IndexOfLink(ALink:WideString):integer;
var i:Integer;
begin
  Result:=-1;
  for  i:= 0 to fItems.Count - 1 do
  if TLocalRssItem(fItems[i]).FLink=ALink then