Delphi - 我的代码之简单封装WinHttpRequest

技术交流,DH讲解.

前段时间,和群里面的朋友讨论提交包的时候,结果发现Indy被大家狂批,哈哈,后来有人推荐用WinHttp,查看了下MSDN,WinHttp主要是靠system32目录下面的WinHttp.dll这个文件,而它又有2种用法,一个是直接API,复杂些,但是功能强大,另外一个就是直接使用WinHttpRequest这个ActiveX.

为了使用方便,对WinHttpRequest进行了简单封装,但是感觉不完善,有空补足.还有好多方法没有封装进来,但是留了一个属性property Http:OleVariant read FHttp write FHttp; 这样大家可以直接调用WinHttpRequest.来看看代码:(直接下载)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 unit  utWinHttp;   interface uses    SysUtils,Classes,Windows;   const    request_headers: array [ 0..14 ] of  string  = (      'Accept' , 'Accept-Encoding' , 'Accept-Language' , 'Cache-Control' ,      'CharSet' , 'Connection' , 'Content-Encoding' , 'Content-Language' ,      'Content-Type' , 'Date' , 'Expires' , 'From' ,      'Referer' , 'UserAgent' , 'Cookie'    );   const    WinHttpRequestOption_UserAgentString = $00000000 ;    WinHttpRequestOption_URL = $00000001 ;    WinHttpRequestOption_URLCodePage = $00000002 ;    WinHttpRequestOption_EscapePercentInURL = $00000003 ;    WinHttpRequestOption_SslErrorIgnoreFlags = $00000004 ;    WinHttpRequestOption_SelectCertificate = $00000005 ;    WinHttpRequestOption_EnableRedirects = $00000006 ;    WinHttpRequestOption_UrlEscapeDisable = $00000007 ;    WinHttpRequestOption_UrlEscapeDisableQuery = $00000008 ;    WinHttpRequestOption_SecureProtocols = $00000009 ;    WinHttpRequestOption_EnableTracing = $0000000A ;    WinHttpRequestOption_RevertImpersonationOverSsl = $0000000B ;    WinHttpRequestOption_EnableHttpsToHttpRedirects = $0000000C ;    WinHttpRequestOption_EnablePassportAuthentication = $0000000D ;    WinHttpRequestOption_MaxAutomaticRedirects = $0000000E ;    WinHttpRequestOption_MaxResponseHeaderSize = $0000000F ;    WinHttpRequestOption_MaxResponseDrainSize = $00000010 ;    WinHttpRequestOption_EnableHttp1_1 = $00000011 ;    WinHttpRequestOption_EnableCertificateRevocationCheck = $00000012 ;      AutoLogonPolicy_Always = $00000000 ;    AutoLogonPolicy_OnlyIfBypassProxy = $00000001 ;    AutoLogonPolicy_Never = $00000002 ;      SslErrorFlag_UnknownCA = $00000100 ;    SslErrorFlag_CertWrongUsage = $00000200 ;    SslErrorFlag_CertCNInvalid = $00001000 ;    SslErrorFlag_CertDateInvalid = $00002000 ;    SslErrorFlag_Ignore_All = $00003300 ;      SecureProtocol_SSL2 = $00000008 ;    SecureProtocol_SSL3 = $00000020 ;    SecureProtocol_TLS1 = $00000080 ;    SecureProtocol_ALL = $000000A8 ;   const    IStream_GUID:TGUID = '{0000000C-0000-0000-C000-000000000046}' ;   type    TCustomWinHttp = class ;    //请求信息类    TRequest = class (TPersistent)    private      FAccept,FAcceptEncoding,FAcceptLanguage: string ;      FCacheControl,FCharSet,FConnection: string ;      FContentEncoding,FContentLanguage,FContentType: string ;      FDate,FExpires,FFrom: string ;      FReferer,FUserAgent: string ;      FCookie: string ;      FCustomHeader:TStringList;    public      constructor  Create;      destructor  Destroy; override;    published      property  Accept: string   read FAccept write  FAccept;      property  AcceptEncoding: string  read FAcceptEncoding write  FAcceptEncoding;      property  AcceptLanguage: string  read FAcceptLanguage write  FAcceptLanguage;      property  CacheControl: string  read FCacheControl write  FCacheControl;      property  CharSet: string  read FCharSet write  FCharSet;      property  Connection: string  read FConnection write  FConnection;      property  ContentEncoding: string  read FContentEncoding write  FContentEncoding;      property  ContentLanguage: string  read FContentLanguage write  FContentLanguage;      property  ContentType: string  read FContentType write  FContentType;      property  Date: string  read FDate write  FDate;      property  Expires: string  read FExpires write  FExpires;      property  From: string  read FFrom write  FFrom;      property  Referer: string  read FReferer write  FReferer;      property  UserAgent: string  read FUserAgent write  FUserAgent;      property  Cookie: string  read FCookie write  FCookie;      property  CustomHeader:TStringList  read FCustomHeader write  FCustomHeader;    end ;    //返回信息类    TResponse = class (TPersistent)    private      FOwner:TCustomWinHttp;      FHeaderList:TStringList;      procedure  Check;      function  Get_Header( const  header_name: string ): string ;      function  Get_Status: Integer ;      function  Get_StatusText: string ;      function  Get_ResponseBody: string ;      function  Get_HeadersText: string ;    public      constructor  Create(http:TCustomWinHttp);      destructor  Destroy; override;      property  Header[ const  Name: string ]: string   read Get_Header;      property  Status: Integer   read Get_Status;      property  StatusText: string   read Get_StatusText;      property  ResponseBody: string   read Get_ResponseBody;      property  HeadersText: string  read Get_HeadersText;    end ;      TCustomWinHttp = class (TComponent)    private      FCreated: Boolean ;      FHttp:OleVariant;      FRequest:TRequest;      FResponse:TResponse;      FRequestTime: Integer ;      FOnRequestTimeOut:TNotifyEvent;        procedure  SetRequestHeaders;      procedure  Set_Option(idx: Integer ;value:OleVariant);      function  Get_Option(idx: Integer ):OleVariant;        procedure  Set_Redirects(B: Boolean );      function  Get_Redirects: Boolean ;        procedure  Set_MaxRedirects(N: Integer );      function  Get_MaxRedirects: Integer ;    public      procedure  Abort;      procedure  ClearRequestHeaders;      function  Get( const  URL: string ): string ;overload;      procedure  Get( Const  URL: string ;res:TStream);overload;      function  Post( const  URL: string ;Req:TStream): string ;overload;      function  Post( const  URL,Req: string ): string ;overload;      procedure  Post( const  URL: string ;Req,Res:TStream);overload;      procedure  Post( const  URL,Req: string ;Res:TStream);overload;      constructor  Create(AOwner: TComponent); override;      destructor  Destroy; override;        property  Http:OleVariant  read FHttp write  FHttp;      property  EnableRedirects: Boolean   read Get_Redirects write  Set_Redirects;      property  MaxRedirects: Integer   read Get_MaxRedirects write  Set_MaxRedirects;      property  Request:TRequest  read FRequest write  FRequest;      property  RequestTime: Integer   read FRequestTime write  FRequestTime;      property  OnRequestTimeOut:TNotifyEvent  read FOnRequestTimeOut write  FOnRequestTimeOut;      property  Response:TResponse  read FResponse write  FResponse;      property  Options[idx: Integer ]:OleVariant  read Get_Option write  Set_Option;    end ;      TWinHttp = class (TCustomWinHttp)    published      property  MaxRedirects;      property  EnableRedirects;      property  Request;      property  Response;      property  RequestTime;      property  OnRequestTimeOut;    end ;   implementation uses    ComObj,AxCtrls,ActiveX,Variants;   { TResponse }   procedure  TResponse . Check; begin    if  FHeaderList . Count = 0  then      FHeaderList . Text:=FOwner . FHttp . GetAllResponseHeaders; end ;   constructor  TResponse . Create(http:TCustomWinHttp); begin    FOwner:=http;    FHeaderList:=TStringList . Create;    FHeaderList . NameValueSeparator:= ':' ; end ;   destructor  TResponse . Destroy; begin    FHeaderList . Free;    inherited ; end ;   function  TResponse . Get_Header( const  header_name: string ): string ; begin    Check;    Result:=FHeaderList . Values[header_name]; end ;   function  TResponse . Get_HeadersText: string ; begin    Check;    Result:=FHeaderList . Text; end ;   function  TResponse . Get_ResponseBody: string ; begin    Result:=FOwner . Http . ResponseBody; end ;   function  TResponse . Get_Status: Integer ; begin    Result:=FOwner . Http . Status; end ;   function  TResponse . Get_StatusText: string ; begin    Result:=FOwner . Http . StatusText; end ;   { TRequest }   constructor  TRequest . Create; begin    inherited ;    FCustomHeader:=TStringList . Create; end ;   destructor  TRequest . Destroy; begin    FCustomHeader . Free;    inherited ; end ;   { TCustomWinHttp }   procedure  TCustomWinHttp . Abort; begin    if  FCreated then      FHttp . Abort(); end ;   procedure  TCustomWinHttp . ClearRequestHeaders; var    I,base: Integer ; begin    base := Integer (FRequest);    for  I := 0  to  14  do      PDWORD(base + 4  * (I+ 1 ))^:= 0 ;    FRequest . CustomHeader . Clear; end ;   constructor  TCustomWinHttp . Create(AOwner: TComponent); begin    inherited ;    FRequest:=TRequest . Create;    FRequest . FCustomHeader . NameValueSeparator:= ':' ;    FResponse:=TResponse . Create(Self);    try      FCreated:= False ;      FHttp:=CreateOleObject( 'WinHttp.WinHttpRequest.5.1' );      FCreated:= True ;    except      raise  Exception . Create( '创建WinHttp失败' );    end ;      FRequestTime:= 4000 ; end ;   destructor  TCustomWinHttp . Destroy; begin    Abort;    FHttp:= 0 ;    FResponse . Free;    FRequest . Free;    inherited ; end ;   function  TCustomWinHttp . Get( const  URL: string ): string ; var    ss:TStringStream; begin    Result:= '' ;    ss:=TStringStream . Create;    try      Get(URL,SS);      Result:=ss . DataString;    finally      ss . Free;    end ; end ;   procedure  TCustomWinHttp . Get( const  URL: string ; res: TStream); var    iu:IUnknown;    os:TOlestream;    s:IStream;    p:OleVariant;    w: Word ; begin    Assert(res<> Nil );    if  Not  FCreated then      Exit;    //清除已经有的header    FResponse . FHeaderList . Clear;    //请求    try      FHttp . Open( 'GET' ,URL, False );      SetRequestHeaders;      FHttp . Send(varEmpty);      if  Not  FHttp . WaitForResponse(FRequestTime) then      begin        FHttp . Abort;        if  Assigned(FOnRequestTimeOut) then          FOnRequestTimeOut(Self);        Exit;      end ;      P:=FHttp . ResponseStream ;      W:=VarType(P);      if  w = varUnknown then      begin        iu:=IUnknown(P);        iu . QueryInterface(IStream_GUID,s);      end ;      if  s= nil  then        Exit;      res . Position:= 0 ;      os:=TOleStream . Create(s);      try        os . Position:= 0 ;        res . CopyFrom(os,os . Size)      finally        os . Free      end ;    except    end ; end ;   function  TCustomWinHttp . Get_MaxRedirects: Integer ; begin    Result:=Get_Option(WinHttpRequestOption_MaxAutomaticRedirects) ; end ;   function  TCustomWinHttp . Get_Option(idx: Integer ): OleVariant; begin    Result:=FHttp . Option[idx]; end ;   function  TCustomWinHttp . Get_Redirects: Boolean ; begin    Result:=FHttp . Option[WinHttpRequestOption_EnableRedirects]; end ;   function  TCustomWinHttp . Post( const  URL, Req: string ): string ; var    ss:TStringStream; begin    Result:= '' ;    SS:=TStringStream . Create;    try      Post(URL,Req,SS);      Result:=ss . DataString;    finally      ss . Free;    end ; end ;   function  TCustomWinHttp . Post( const  URL: string ; Req: TStream): string ; var    ss:TStringStream;    S: string ; begin    Assert(Req<> nil );    ss:=TStringStream . Create;    try      Req . Position:= 0 ;      ss . CopyFrom(Req,Req . Size);      S:=ss . DataString;      ss . Clear;      Post(URL,S,ss);      Result:=ss . DataString;    finally      ss . Free;    end ; end ;   procedure  TCustomWinHttp . Post( const  URL: string ; Req, Res: TStream); var    ss:TStringStream;    S: string ;   begin    Assert(Req<> nil );    ss:=TStringStream . Create;    try      Req . Position:= 0 ;      ss . CopyFrom(Req,Req . Size);      S:=ss . DataString;      Post(URL,s,Res)    finally      ss . Free;    end ;   end ;   procedure  TCustomWinHttp . SetRequestHeaders; var    I,dx,base: Integer ;    S: string ; begin    base:= Integer (FRequest);    for  I := 0  to  14  do    begin      dx:=base + 4  * (I + 1 );      s:= PString (dx)^;      if  s<> ''  then        FHttp . SetRequestHeader(request_headers[I],S);    end ;    for  I := 0  to  FRequest . CustomHeader . Count - 1  do      FHttp . SetRequestHeader(FRequest . CustomHeader . Names[I],              FRequest . CustomHeader . ValueFromIndex[I]      );   end ;   procedure  TCustomWinHttp . Set_MaxRedirects(N: Integer ); begin    Set_Option(WinHttpRequestOption_MaxAutomaticRedirects,N); end ;   procedure  TCustomWinHttp . Set_Option(idx: Integer ; value: OleVariant); begin    FHttp . Option[idx]:=value; end ;   procedure  TCustomWinHttp . Set_Redirects(B: Boolean ); begin    Set_Option(WinHttpRequestOption_EnableRedirects,B); end ;   procedure  TCustomWinHttp . Post( const  URL, Req: string ; Res: TStream); var    s:IStream;    os:TOleStream;    p:OleVariant; begin    Assert(Res<> Nil );    if  Not  FCreated then      Exit;    FResponse . FHeaderList . Clear;    try      FHttp . Open( 'POST' ,URL, False );      SetRequestHeaders;      FHttp . SetRequestHeader( 'Content-Length' ,IntToStr(Length(Req)));      FHttp . Send(Req);      if  Not  FHttp . WaitForResponse(FRequestTime) then      begin        FHttp . Abort;        if  Assigned(FOnRequestTimeOut) then          FOnRequestTimeOut(Self);        Exit;      end ;      P:=FHttp . ResponseStream;      if  VarType(P) = varUnknown then        IUnknown(P).QueryInterface(IStream_GUID,S);      if  s= nil  then        Exit;      os:=TOleStream . Create(s);      try        Res . Position:= 0 ;        os . Position:= 0 ;        Res . CopyFrom(os,os . Size);      finally        os . Free;      end ;    except    end ; end ;   end .

简单用法,表单提交来登录人人网:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 type    TForm3 = class (TForm)      btn1: TButton;      procedure  FormCreate(Sender: TObject);      procedure  FormClose(Sender: TObject; var  Action: TCloseAction);      procedure  btn1Click(Sender: TObject);    private      { Private declarations }      Http:TWinHttp;    public      { Public declarations }    end ;   var    Form3: TForm3;   implementation   {$R *.dfm}   procedure  TForm3 . btn1Click(Sender: TObject); var    s: string ; begin    //清空之前的header    Http . ClearRequestHeaders;    //设置自己的header ,两种方法都可以    //POST时候这个必须设置成这样    Http . Request . ContentType:= 'application/x-www-form-urlencoded' ; //  Http.Request.CustomHeader.Add('Content-Type: application/x-www-form-urlencoded');    S:=Http . Post( 'http://www.renren.com/PLogin.do' ,    'email=huangjacky@163.com&password=密码&origURL=http://www.renren.com/Home.do&domain=renren.com' );    //html代码    ShowMessage(S);    //返回的header    ShowMessage(Http . Response . HeadersText);    //状态    ShowMessageFmt( 'Code:%D,Text:%S' ,        [Http . Response . Status,Http . Response . StatusText]      ); end ;   procedure  TForm3 . FormClose(Sender: TObject; var  Action: TCloseAction); begin    Http . Free; end ;   procedure  TForm3 . FormCreate(Sender: TObject); begin    Http:=TWinHttp . Create(Self);    //禁止转向    Http . EnableRedirects:= False ; end ;

再来个下载文件的例子:

1 2 3 4 5 6 7 8 procedure  TForm3 . btn2Click(Sender: TObject); var    S:TFileStream; begin    s:=TFileStream . Create( 'C:\11.rar' ,fmCreate);    Http . Get( 'http://files.cnblogs.com/huangjacky/Delphi.Distiller.v1.83.rar' ,s);    s . Free; end ;

我是DH.