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delphi 通过TNetHTTPClient解析抖音无水印高清视频原理及解决X-Bogus签名验证2023-5-1_抖音x-bogus

作者：知新_RL | 2024-04-29 23:00:07

踩

抖音x-bogus

一、杂谈
最近有很多热心网友反馈抖音去水印又不行了，之前是时不时被blocked，现在直接连内容都没有了，返回直接就是空了，我们今天简要给大家分析一下请求过程，附上delphi 源码，及生成签名验证，成功请求到json数据的解决方法。

二、请求过程分析
我们还是先获取一个抖音链接

https://v.douyin.com/A2VSVxc/
通过访问重定向

https://www.douyin.com/video/7065264218437717285
然后提取到其中的视频ID

7065264218437717285
如果是之前，我们会直接GET请求

https://www.douyin.com/aweme/v1/web/aweme/detail/?aweme_id=7065264218437717285
然后就能得到响应内容了。

但是这种方法已经失效了，今天我们会讲解如何在增加一些请求头参数以及X-Bogus后，可以仍然获取到JSON格式的数据。如：
{"aweme_detail":{"anchors":null,"authentication_token":"......
.........}
可以看到，获取到的aweme_detail json数据和以前一样。

三、URL参数X-Bogus
X-Bogus你可以理解为是一个根据视频ID及user-agent通过JS生成的用户信息参数，它可以用于校验。
详细的一篇分析可以参考Freebuf上的《【JS 逆向百例】某音 X-Bogus 逆向分析，JSVMP 纯算法还原》。

下面是完整的delphi 源码解析类，主要流程如下：
1.传入抖音分享链接：
https://v.douyin.com/A2VSVxc/
重定向得到：
https://www.douyin.com/video/7065264218437717285

2.提取到其中的视频ID：
7065264218437717285

3.无水印视频接口不变：
https://www.douyin.com/aweme/v1/web/aweme/detail/?aweme_id=7065264218437717285

4.（增加步骤4）根据X-Bogus 算法，传入url链接及USER_AGENT数据，生成一个形如：
https://www.douyin.com/aweme/v1/web/aweme/detail/?aweme_id=7065264218437717285&X-Bogus=DFSzswSL2MtANHxFtG3DB09WcBjv

一个携带X-Bogus签名验证字段的请求链接。使用这个链接发送GET请求，就能得到aweme_detail 的json 数据了。不信大家可以试试。不过，这个链接是不能
在浏览器直接访问的，还必须加上cookie,refer等请求头数据，详情看下面的Tdouyin解析类。

5.关于高清无水印视频链接的获取方法

从"aweme_detail" json数据解析出视频的Uri项，带入高清视频接口：
https://aweme.snssdk.com/aweme/v1/play/?video_id=v0200fg10000c86doo3c77uai4m711qg&ratio=1080p&line=0

执行重定向getRedirectedUrl（）得到高清无水印链接：
https://v95-p-cold.douyinvod.com/9f8215c6204afafffee302e612317776/64201324/video/tos/cn/tos-cn-ve-15c001-alinc2/35721d123b6243cca42398b0c5243c32/?a=1128&ch=0&cr=0&dr=0&cd=0%7C0%7C0%7C0&cv=1&br=2209&bt=2209&cs=0&ds=4&ft=bvjWJkQQqUsmfd4ZFo0OW_EklpPiXnlFZMVJEEy8kdbPD-I&mime_type=video_mp4&qs=0&rc=NDU3Omc3aDY8ZGc7OTkzOUBpajQ6N2Q6ZnJnOzMzNGkzM0BiXjE0NTQvXmExNTVeNTU2YSNuLmpmcjQwbDNgLS1kLS9zcw%3D%3D&l=20230326163724C8959375177E24BE6CEE&btag=a8000

详细步骤看以下TDouyin解析类，关键代码处都有注解：

1.解析类：


unit uDouyin;
 
interface
uses
  windows,classes,System.Net.URLClient, System.Net.HttpClient, System.Net.HttpClientComponent,
  System.SysUtils,strutils,uLog,System.RegularExpressions,uFuncs,system.JSON,uConfig,
  uVideoInfo,uDownVideo;
const
  wm_user=$0400;
  wm_downfile=wm_user+100+1;  //消息参数；
 
  //USER_AGENT标识客户端的类型，这儿是电脑浏览器端。
  USER_AGENT:string='Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36';
 
  //USER_AGENT标识客户端的类型，这儿是手机APP端。
  USER_AGENT_PHONE:string='Mozilla/5.0 (iPhone; CPU iPhone OS 15_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6 Mobile/15E148 Safari/604.1';
  USER_AGENT_PHONE_2:string='TikTok 26.2.0 rv:262018 (iPhone; iOS 14.4.2; en_US) Cronet';
 
  //无水印视频接口，跟以前一样。
  DOUYIN_API_URL:string='https://www.douyin.com/aweme/v1/web/aweme/detail/?aweme_id=' ;
  DOUYIN_API_URL_2:string='https://www.douyin.com/aweme/v1/web/aweme/detail/?aweme_id=%s&aid=1128&version_name=23.5.0&device_platform=android&os_version=2333' ;
 
  //高清无水印视频接口：
  DOUYIN_API_URL_1080 = 'https://aweme.snssdk.com/aweme/v1/play/?video_id=%s&ratio=1080p&line=0';
  type
  TDouyin=class(TThread)                //支持多线程下载；
   private
     FId:cardinal;   //线程标识；
     Furl:string;    //分享的链接；;
     FRedirectedUrl:string;    //重定向后的链接；
     Fvideourl:string;         //解析后得到的无水印视频链接；
     FvideoId:string;          //视频id    如：7065264218437717285
     FvideoTitle:string;       //视频标题
     Fnickname:string;         //作者昵称
     FcoverUrl:string;         //视频封面链接
     Fmsg:string;              //线程消息
     Fsavedir:string;          //保存视频文件及封面图片的目录
     Furl_1080:string;         //高清视频链接
     Furi_1080:string;         //高清视频uri参数 不懂的+v:metabycf
     Fphotos:string;
     class var Fcookie: string;   //cookie参数 ，可从浏览器获取  静态类成员
     class var Fform: HWND;       //接收消息的窗体句柄  类成员
     procedure SetId(id:cardinal);       //设置线程id
     procedure SetSaveDir(dir:string);    //设置保存目录
     class procedure SetForm(const hForm: HWND); static;    //设置窗体句柄 静态方法
     class procedure SetCookie(const cookie: string); static; //设置cookie 静态方法
 
   protected
     procedure Execute; override;
   public
     constructor Create(id:cardinal;url:string);
     destructor Destroy;
     property id:cardinal read FId write SetId;      //id属性
     property url:string read Furl;                  //分享链接 属性
     property msg:string read Fmsg;                  //线程消息 属性
     property videourl:string read Fvideourl;         //无水印视频链接 属性
     property videoTitle:string read FvideoTitle;     //视频标题  属性
     property nickname:string read Fnickname;         //用户昵称
     property RedirectedUrl:string read FRedirectedUrl;  //重定向链接  属性
     property videoId:string read FvideoId;              //视频id   属性  如：7065264218437717285
     property coverUrl:string read FcoverUrl;            //封面链接  属性
     property url_1080:string read Furl_1080;            //高清视频链接   属性
     property photos:string read Fphotos;
     property savedir:string read Fsavedir write setSaveDir;  //保存目录 属性
     function getRedirectedUrl(url:string):string;overload;   //获取重定向链接
     function getRedirectedUrl(url,refer,user_agent:string):string;overload;  //获取重定向链接
     function getVideoId(txt:string):string; //解析出视频id  如：7065264218437717285
     function getVideoUrl():string;          //解析无水印视频地址，封面链接，视频标题    工作流程方法在这儿：
     function parseJson(jo:string):string;   //解析aweme_detail json数据
     class property form: HWND read Fform write SetForm;  //窗体句柄 类属性
     class property cookie: string read Fcookie write SetCookie; //cookie 类属性
     function getPostResult(data:string):string;  //post 请求
     function getRequestResult2(apiurl:string;Cookie:string):string; //GET 请求
     function getBogusUrl(url:string):string; X-Bogus 算法 不明白的+v:metabycf
  end;
implementation
 
//解析无水印视频地址，封面链接，视频标题    工作流程方法在这儿：
function TDouyin.getVideoUrl():string;
var
  apiurl,apiurl2,jo:string;
  i:integer;
  video:TvideoInfo;
  down:TdownVideo;
begin
  result:='';
  FcoverUrl:='';
  FvideoUrl:='';
  Fphotos:='';
try
  //第一步：执行重定向，从而获取到视频id
  //如：https://www.douyin.com/video/7065264218437717285
  FRedirectedUrl:=getRedirectedUrl(Furl,Furl,USER_AGENT);
  log('FRedirectedUrl='+FRedirectedUrl);  //日志记录
  if(FRedirectedUrl)='' then exit;
 
  //第二步：分析出视频id,如：7065264218437717285
  FvideoId:=getVideoId(FRedirectedUrl);
  log('FvideoId='+FvideoId);     //日志记录
  if(FvideoId)='' then exit;
 
  //apiurl:=DOUYIN_API_URL+FvideoId; //视频接口
  apiurl:=format(DOUYIN_API_URL_2,[FvideoId]); //视频接口
 
  //第三步：计算X-Bogus验证，加到视频接口上。得到新的请求链接  多了这一步骤。
  //如：https://www.douyin.com/aweme/v1/web/aweme/detail/?aweme_id=7065264218437717285&X-Bogus=DFSzswSL2MtANHxFtG3DB09WcBjv
  //不明白的+v:metabycf
  apiurl2:=getBogusUrl(apiurl);    //具有X-Bogus验证的视频接口  多了这一步骤。
  log(apiurl2);                    //日志记录
  if(apiurl2='')then begin log('apiurl2=k');exit;end;
 
  //第四步：发送GET请求，带上cookie,refer参数；到这一步，已经能拿到"aweme_detail"  json数据了。
  jo:=getRequestResult2(apiurl2,Fcookie);
  Fmsg:=jo;
  log(jo);  //日志记录
  if(pos('aweme_detail',jo)<=0)then begin
    log('aweme_detail=k');
    exit;
  end;
  if(pos('"aweme_detail":null',jo)>0)then exit;
 
  //第五步： 解析 "aweme_detail"  json数据
  parseJson(jo);
 
  //第六步： 1解析 图文
  if(Fphotos<>'')then
  begin
    video:=TvideoInfo.Create(Fvideotitle,coverUrl,'',Fphotos);
    down:=TdownVideo.Create(Fid,video,Fsavedir,false);
    //down.form:=Fform;
    //down.cookie:=Fcookie;
    //if(DEBUG=true)then downvideo.process else
    down.Start;
    exit;
  end;
 
  //第六步： 2解析 高清视频地址
  if(Furi_1080<>'')then  //Furi_1080为视频 uri
  begin
    Furl_1080:=format(DOUYIN_API_URL_1080,[Furi_1080]);
    log(Furl_1080); //日志记录
    Furl_1080:=getRedirectedUrl(Furl_1080,FRedirectedUrl, USER_AGENT_PHONE); //重定向
    log('Furl_1080='+Furl_1080);    //日志记录
  end;
 
  //第七步： 启动下载线程，下载视频文件和封面图片。
  if(Fvideotitle<>'')and(Furl_1080<>'')and(FcoverUrl<>'')then
  begin
    video:=TvideoInfo.Create(Fvideotitle,coverUrl,Furl_1080,'');
    down:=TdownVideo.Create(Fid,video,Fsavedir,false);
    //down.form:=Fform;
    //down.cookie:=Fcookie;
    down.Start;
  end;
finally
  //第八步： 发送解析完成消息。
  Fmsg:='complete';
  SendMessage(Fform,wm_downfile,2,integer(self));
end;
 
end;
 
//第四步：发送GET请求，带上cookie,refer参数；到这一步，已经能拿到"aweme_detail"  json数据了。
function TDouyin.getRequestResult2(apiurl:string;Cookie:string):string;
var
  client: TNetHTTPClient;
  ss: TStringStream;
  s,id:string;
  AResponse:IHTTPResponse;
  i:integer;
begin
try
  client := TNetHTTPClient.Create(nil);
  SS := TStringStream.Create('', TEncoding.UTF8);
  ss.Clear;
  with client do
  begin
    ConnectionTimeout := 10000; // 10秒
    ResponseTimeout := 10000; // 10秒
    AcceptCharSet := 'utf-8';
    UserAgent := USER_AGENT; //1   USER_AGENT      USER_AGENT_PHONE_2
    client.AllowCookies:=true;
    client.HandleRedirects:=true;
    Accept:='application/json'; //'*/*'
    client.ContentType:='application/json'; //2
    client.AcceptLanguage:='zh-CN';
 
    client.CustomHeaders['Cookie'] := cookie;
    client.CustomHeaders['Referer'] := Furl;
    try
        AResponse:=Get(apiurl, ss);
        result:=ss.DataString;
    except
      on E: Exception do
        Log(e.Message);
 
    end;
  end;
finally
  ss.Free;
  client.Free;
end;
 
end;
 
//第五步： 解析 "aweme_detail"  json数据  :分为视频和图文两类
function TDouyin.parseJson(jo:string):string;
var
  json,jroot,jvideo,j1,j2: TJSONObject;
  arr,arr1:TJSONARRAY;
  uri,aweme_type,photo:string;
  i:integer;
begin
  result:='';
try
  json := TJSONObject.ParseJSONValue(jo) as TJSONObject;
  if json = nil then exit;
  jroot:=json.GetValue('aweme_detail') as TJSONObject;
  FvideoTitle:=trim(jroot.GetValue('desc').Value);
 
  aweme_type:=jroot.GetValue('aweme_type').Value;
 
  if(aweme_type='68')then       //图文
  begin
    arr:=jroot.GetValue('images') as TJSONARRAY;
    for I := 0 to arr.Size-1 do
    begin
      j1:=arr.Get(i) as TJSONObject;
      arr1:=j1.GetValue('url_list')  as TJSONARRAY;
 
      photo:=arr1.Items[0].Value;
      Fphotos:=Fphotos+photo+#13#10;
    end;
    result:='#100#'+Fphotos+'#'+FcoverUrl+'#'+FvideoTitle;
    exit;
  end;
 
  jvideo:=jroot.GetValue('video') as TJSONObject;
  j1:=jvideo.GetValue('cover') as TJSONObject;  //cover origin_cover
  arr:=j1.GetValue('url_list') as TJSONARRAY;
  FcoverUrl:=arr[0].Value;
 
  j1:=jvideo.GetValue('play_addr') as TJSONObject;
  arr:=j1.GetValue('url_list') as TJSONARRAY;
  FvideoUrl:=arr[0].Value;
  FvideoUrl:=stringreplace(FvideoUrl,'playwm','play',[rfReplaceAll]);
 
  Furi_1080:=j1.GetValue('uri').Value;
 
  result:='#100#'+FvideoUrl+'#'+FcoverUrl+'#'+FvideoTitle;
 
finally
  if json <> nil then json.Free;
end;
end;
 
//第二步：分析出视频id,如：7065264218437717285
function TDouyin.getVideoId(txt:string):string;
var
　m:TMatch;
  i:integer;
begin
  result:='';
  m := TRegEx.Match(txt,'/video/([^/?]+)/');
  if(m.Groups[1].Success=false) or (length(m.Groups[1].Value)<>19)then exit;
  result:=m.Groups[1].Value;
 
end;
  //X-Bogus 算法 不明白的+v:metabycf
function TDouyin.getBogusUrl(url:string):string;
var
  json:TJSONObject;
  data:string;
begin
  result:='';
try
  json:=TJSONObject.Create;
  json.AddPair('url',url);
  json.AddPair('user_agent',USER_AGENT);
  data:=json.ToString;
  log(data);
  data:=getPostResult(data);
  log(data);
  if(data='')then exit;
  json:=TJSONObject.ParseJSONValue(data) as TJSONObject;
  result:=json.GetValue('param').Value;
finally
  json.Free;
end;
end;
 
//第一步：执行重定向，从而获取到视频id
function TDouyin.getRedirectedUrl(url,refer,user_agent:string):string;
var
  client: TNetHTTPClient;
  ss: TStringStream;
  s,id:string;
  AResponse:IHTTPResponse;
  i:integer;
begin
try
  client := TNetHTTPClient.Create(nil);
  SS := TStringStream.Create('', TEncoding.UTF8);
  ss.Clear;
  with client do
  begin
    ConnectionTimeout := 2000; // 2秒
    ResponseTimeout := 2000; // 10秒
    AcceptCharSet := 'utf-8';
    UserAgent := user_agent;
    client.AllowCookies:=true;
    client.HandleRedirects:=false;
    Accept:='*/*';
    client.CustomHeaders['Referer'] := refer;
    try
        AResponse:=Get(url, ss);
        Log('getRedirectedUrl AResponse='+ss.DataString);
        s:=AResponse.HeaderValue['Location'];
        if(s='')then exit;
        result:=s;
    except
      on E: Exception do
        Log(e.Message);
 
    end;
  end;
finally
  ss.Free;
  client.Free;
end;
end;
 
constructor TDouyin.Create(id:cardinal;url:string);
begin
  //inherited;
  //FreeOnTerminate := True;
  inherited Create(True);
  FId:=id;
  Furl:=url;     //分享链接
  Furi_1080:='';   //视频uri
  Fphotos:='';
end;
destructor TDouyin.Destroy;
begin
  inherited Destroy;
end;
 
//工作线程
procedure TDouyin.Execute;
begin
try
  getVideoUrl();
finally
 
end;
end;
 
 
//------------------------------------------属性方法-------------------------------------
 procedure TDouyin.SetId(Id:cardinal);
 begin
   FId:=Id;
 end;
 class procedure TDouyin.SetForm(const hForm: HWND);
 begin
   Fform:=hForm;
 end;
 
 procedure TDouyin.SetSaveDir(dir:string);
 begin
   Fsavedir:=dir;
 end;
 class procedure TDouyin.SetCookie(const cookie: string);
 begin
   Fcookie:=cookie;
 end;
 
 
end.

2、视频信息


unit uVideoInfo;
 
interface
type
  TVideoInfo=class
    private
      Ftitle:string;       //标题
      FcoverUrl:string;   //封面地址
      FvideoUrl:string;   //视频地址
      Fphotos:string;     //图片地址
      procedure SetTitle(title:string);
    public
      property title:string read Ftitle write Settitle;
      property coverUrl:string read FcoverUrl;
      property videoUrl:string read FvideoUrl;
      property photos:string read Fphotos;
      constructor Create(title,coverUrl,videoUrl,photos:string);
  end;
implementation
constructor TVideoInfo.Create(title,coverUrl,videoUrl,photos:string);
begin
  Ftitle:=title;
  FcoverUrl:=coverUrl;
  FvideoUrl:=videoUrl;
  Fphotos:=photos;
end;
procedure TVideoInfo.Settitle(title:string);
begin
  Ftitle:=title;
end;
end.

3、下载


 
unit uDownVideo;
 
interface
uses
  windows,classes,System.Net.URLClient, System.Net.HttpClient, System.Net.HttpClientComponent,
  System.SysUtils,strutils,uLog,System.RegularExpressions,uFuncs,system.JSON,uConfig,
  uVideoInfo,WinInet,urlmon,shlobj,ioutils;
const
  wm_user=$0400;
  wm_downfile=wm_user+100+1;
  USER_AGENT:string='Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36';
type
  TDownVideo=class(TThread)
   private
     FId:cardinal;
     Fvideo:TvideoInfo;
     Fsavedir:string;
     FvideoFilename:string;
     FcoverFilename:string;
     FphotoFilename:string;    //图片文件名
     Fmsg:string;
     FSerial:boolean;         //是否在文件名前面加入序号；
     Fsuccess:boolean;
     Frefer:string;
     class var Fcookie: string;
 
     procedure SetId(id:cardinal);
     procedure SetSavedir(dir:string);
     procedure SetRefer(refer:string);
     class var Fform: HWND;
     class procedure SetForm(const hForm: HWND); static;
     class procedure SetCookie(const cookie: string); static;
     function DownloadFile(SourceFile, DestFile: string): Boolean;
 
   protected
     procedure Execute; override;
   public
     constructor Create(id:cardinal;video:TvideoInfo;savedir:string;bSerial:boolean);
     destructor Destroy;
     property id:cardinal read FId write SetId;
     property savedir:string read Fsavedir write SetSavedir;
     property video:TvideoInfo read Fvideo;
     property msg:string read Fmsg;
     property videoFilename:string read FvideoFilename;
     property coverFilename:string read FcoverFilename;
     property photoFilename:string read FphotoFilename;
     property serial:boolean read Fserial;
     property success:boolean read Fsuccess;
     property refer:string read Frefer write SetRefer;
     class property cookie: string read Fcookie write SetCookie;
     class property form: HWND read Fform write SetForm;
     function formatFilename(caption:string):string;
     function formatDir(dir:string):string;
     function GetValidName(s:string):string;
 
     procedure downloadFileLog(SourceFile, DestFile: string);
     procedure process();
  end;
implementation
//bSerial为是否给文件名加上序号
constructor TDownVideo.Create(id:cardinal;video:TvideoInfo;savedir:string;bSerial:boolean);
begin
  //inherited;
  //FreeOnTerminate := True;
  inherited Create(True);
  FId:=id;
  Fvideo:=video;
  Fsavedir:=formatdir(savedir);
  Fmsg:='';
  FvideoFilename:='';
  FcoverFilename:='';
  FphotoFilename:='';
  Fsuccess:=false;
  Fserial:=bSerial;
  if(not directoryexists(Fsavedir))then
    forcedirectories(Fsavedir);
end;
destructor TDownVideo.Destroy;
begin
  inherited Destroy;
end;
//下载流程
procedure TDownVideo.process();
var
  dir,title,photoUrl,photoname:string;
  b:boolean;
  photolist:tstrings;
  i:integer;
begin
  photolist:=nil;
try
  title:=formatfilename(trim(video.title));
  if(Fvideo.photos='')then  //下载视频
  begin
    if(Fserial=true)then
    begin
      FcoverFilename:=Fsavedir+'\'+inttostr(Fid)+'.'+title+'.webp';
      FvideoFilename:=Fsavedir+'\'+inttostr(Fid)+'.'+title+'.mp4';
    end else begin
      FcoverFilename:=Fsavedir+'\'+title+'.webp';
      FvideoFilename:=Fsavedir+'\'+title+'.mp4';
    end;
    if(video.coverUrl<>'')then downloadFileLog(Fvideo.coverUrl,FcoverFilename);
    if(video.videoUrl<>'')then downloadFileLog(Fvideo.videoUrl,FvideoFilename);
  end else begin      //下载图片
    photolist:=tstringlist.Create;
    photolist.Text:=video.photos;
 
    if(Fserial=true)then
      dir:=Fsavedir+'\'+inttostr(Fid)+'.'+title
    else
      dir:=Fsavedir+'\'+title;
    forcedirectories(dir);
    if(Fvideo.coverUrl<>'')then
    begin
      FcoverFilename:=dir+'\0.封面 '+title+'.webp';
      downloadFileLog(Fvideo.coverUrl,FcoverFilename);
    end;
    for I := 0 to photolist.Count-1 do
    begin
      photoUrl:=photolist[i];
      if(trim(photoUrl)='')then continue;
      photoname:=dir+'\'+inttostr(i+1)+'.'+title+'.webp';
      downloadFileLog(photoUrl,photoname);
      FphotoFilename:=FphotoFilename+photoname+#13#10;
    end;
  end;
 
finally
  Fmsg:='complete';
  if(photolist<>nil)then photolist.Free;
  SendMessage(Fform,wm_downfile,1,integer(self));
end;
end;
//线程中执行下载
procedure TDownVideo.Execute;
begin
  process();
end;
function TDownVideo.GetValidName(s:string):string;
var
  c:char;
  txt:string;
begin
  txt:=s;
  for c in TPath.GetInvalidFileNameChars() do
  begin
    txt:=stringreplace(txt,c,'',[rfReplaceAll]);
  end;
  result:=txt;
end;
//去除文件名中的非法字符
function TDownVideo.formatFilename(caption:string):string;
var
  s:string;
begin
  s:=caption;
  if(length(s)>72)then s:=leftstr(s,72);
  result:=GetValidName(s);
end;
//去除路径中的非法字符
function TDownVideo.formatDir(dir:string):string;
var
  caption:string;
begin
  caption:=trim(extractfilename(dir));
  if(length(caption)>72)then caption:=leftstr(caption,72);
  caption:=GetValidName(caption);
  result:=extractfilepath(dir)+caption;
end;
//下载文件
procedure TDownVideo.downloadFileLog(SourceFile, DestFile: string);
begin
  if(fileexists(DestFile))then deletefile(DestFile);
  if(Downloadfile(SourceFile,DestFile))then
  begin
    log('成功：'+DestFile);
    Fsuccess:=true;
  end else begin
    log('失败：'+DestFile+'  '+SourceFile);
    Fsuccess:=false;
  end;
end;
//下载文件
function TDownVideo.DownloadFile(SourceFile, DestFile: string): Boolean;
begin
try
  DeleteUrlCacheEntry(pchar(SourceFile));
  Result := UrlDownloadToFile(nil, PChar(SourceFile), PChar(DestFile), 0, nil) = 0;
except
  Result := False;
end;
end;
 
 
//------------------------------------------属性方法-------------------------------------
 procedure TDownVideo.SetSavedir(dir:string);
 begin
   Fsavedir:=dir;
 end;
 procedure TDownVideo.SetRefer(refer:string);
 begin
   Frefer:=refer;
 end;
 class procedure TDownVideo.SetCookie(const cookie: string);
 begin
   Fcookie:=cookie;
 end;
  procedure TDownVideo.SetId(Id:cardinal);
 begin
   FId:=Id;
 end;
 class procedure TDownVideo.SetForm(const hForm: HWND);
 begin
   Fform:=hForm;
 end;
 
end.

需要技术支持及成品的+v:metabycf

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