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使用 IntraWeb (39) - THttpRequest、THttpReply

2024-07-09 23:04:36   223人阅读


在其它服务器脚本语言中熟悉的 Request、Response(THttpRequest、THttpReply) 在 IntraWeb 中算是幕后英雄了, 用户基本不需要直接操作它们了.

IW 默认 Post 传值(WebApplication.Request.HttpMethod = hmPost, 只读), 但像表单字段之类, 在 IW 中直接根据控件名称读取就是了, 用不着麻烦 Request.
但如果需要, 可以使用 WebApplication.Request.QueryFields.Values[‘控件名‘] 读取.

要读出以 Get 方式传输的 Url 变量, 发现在很多时候 WebApplication.Request.QueryFields.Values[‘变量名‘] 并不好用; 经过尝试, 也不是没有办法:
1、笨办法: 自己解析 WebApplication.Request.Referer;
2、Request 以参数方式出现时往往可以, 譬如 TIWAppForm.OnURLRequest 事件:
{Unit1 中的关键代码}procedure TIWForm1.IWButton1Click(Sender: TObject);begin  WebApplication.GoToURL(‘Page2.html?AAA=111&BBB=222‘);end;{Unit2 中的关键代码}procedure TIWForm2.IWAppFormURLRequest(aSender: TIWAppForm; aRequest: THttpRequest); //需 uses IW.HTTP.Requestbegin  IWMemo1.Lines.Add(WebApplication.Request.QueryFields.Values[‘bbb‘]);end;initialization  TIWForm2.SetURL(‘‘, ‘Page2.html‘);

我想, 按照 IW 的理念, 网页间互相传递的参数应该是用 Session(下篇博客测试下).

有时还要用到运行参数, 输入运行参数有两种方法:
1.从代码(如: WebApplication.RunParams.CommaText := ‘AAA=111,BBB=222‘);
2.从 Server 控制台(如下图);


读取运行参数, 如: MyStr := WebApplication.RunParams.Values[‘AAA‘];

THttpRequest 所在单元及继承链:
IW.HTTP.Request.THttpRequest < TObject

主要成员(根据测试结果判断吧):
property UserAgent: string       //测试结果: Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Geckoproperty Referer: string         //测试结果: http://127.0.0.1:8888/$/?aaa=111&bbb=222; 测试时添加了两个运行参数property ScriptName: string      //property Host: string            //测试结果: 127.0.0.1property URL: string             //property PathInfo: string        //测试结果: /$/callbackproperty RemoteAddr: string      //测试结果: 127.0.0.1property ServerPort: integer     //测试结果: 8888property Query: string           //测试结果: callback=...property HttpMethod: THttpMethod //测试结果: hmPost(其它: hmNone, hmGet, hmPut, hmPost, hmHead)property IfModifiedSince: string //property ForwardedFor: string    //property HttpClientIP: string    //property AcceptLanguage: string  //测试结果: zh-CNproperty HttpsHeader: string     //property Authorization: string   //property AuthorizationHeader: string //property AuthUser: string        //property AuthPass: string        //property ServerVariables: TStrings //property HasContent: Boolean       //测试结果: Trueproperty Files: THttpFileList      //property QueryString: string       //测试结果: callback=...function GetCookieValue(const aName: string): string;function GetRawHeaderValue(const aName: string): string;function GetServerVariableValue(const aVariableName: string): string;function GetContentFieldValue( const aContentFieldName: string): string;procedure SetRewriteURL(const aUrl: string);property RawHeaders: TStrings //测试结果:                               //Accept: */*                              //Content-Type: application/x-www-form-urlencoded                              //Referer: http://127.0.0.1:8888/$/                              //Accept-Language: zh-CN                              //Accept-Encoding: gzip, deflate                              //User-Agent: Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko                              //Host: 127.0.0.1:8888                              //Content-Length: 205                              //DNT: 1                              //Connection: Keep-Alive                              //Cache-Control: no-cache                              //Cookie: IW_MyApp=rtDemtDbmuncnJHgndGWqueWrKmWodK1otaXrue4mdu_2property ContentFields: TStrings //测试结果:                                 //IWBUTTON2=                                 //IW_Action=IWBUTTON2                                 //IW_ActionParam=                                 //IW_FormName=IWForm1                                 //IW_FormClass=TIWForm1                                 //IW_LocationHash=                                 //IW_TrackID_=2                                 //IW_width=1920                                 //IW_height=985                                 //IW_SessionID_=mKrbmdjendG0mZLgndGXoefbn0yWoefbmti2rJngode                                 //callback=IWBUTTON2.DoOnAsyncClick                                 //x=48                                 //y=10                                 //which=0                                 //modifiers=property CookieFields: TStrings  //测试结果: IW_MyApp=ourdmeffmdHgmtK1ndiWodGZoungnKvfmtG5nKiXmue_2property QueryFields: TStrings //测试结果:                               //IWBUTTON2=                               //IW_Action=IWBUTTON2                               //IW_ActionParam=                               //IW_FormName=IWForm1                               //IW_FormClass=TIWForm1                               //IW_LocationHash=                               //IW_TrackID_=2                               //IW_width=1920                               //IW_height=985                               //IW_SessionID_=nZKXqtvcrJvbmtiZndjfrKe1nZm3numYmta3ruiXnZG                               //callback=IWBUTTON2.DoOnAsyncClick                               //x=52                               //y=18                               //which=0                               //modifiers=function GetParams: TStrings; //测试结果:                              //IWBUTTON2=                              //IW_Action=IWBUTTON2                              //IW_ActionParam=                              //IW_FormName=IWForm1                              //IW_FormClass=TIWForm1                              //IW_LocationHash=                              //IW_TrackID_=2                              //IW_width=1920                              //IW_height=985                              //IW_SessionID_=nJDbrdvcrdaZnZiZndm0mJG0mem1ndnerdC1nJaWree                              //callback=IWBUTTON2.DoOnAsyncClick                              //x=56                              //y=15                              //which=0                              //modifiers=                              //IWBUTTON2=                              //IW_Action=IWBUTTON2                              //IW_ActionParam=                              //IW_FormName=IWForm1                              //IW_FormClass=TIWForm1                              //IW_LocationHash=                              //IW_TrackID_=2                              //IW_width=1920                              //IW_height=985                              //IW_SessionID_=nJDbrdvcrdaZnZiZndm0mJG0mem1ndnerdC1nJaWree                              //callback=IWBUTTON2.DoOnAsyncClick                              //x=56                              //y=15                              //which=0                              //modifiers=


THttpReply 所在单元及继承链:
IW.HTTP.Reply.THttpReply < TObject

主要成员:
property AllowCaching: Boolean //property AuthRealm: string     //property CacheTTL: Integer     //property Code: Word	       //property CodeText: string      //property ContentType: string   //property Cookies: TCookieList //property LastModified: TDateTime      //property Headers: TStrings	      //property Expires: TDateTime	      //property DataType: THttpReplyType     //property ServerPort: Integer	      //property SendingFile: Boolean	      //property CacheControlEnabled: Boolean //If FALSE, completely disable cache control header fields ("Expires", "Last-Modified", "Pragma: no-cache" and "Cache-Control: no-cache"). Default = TRUEconstructor Create(aBuffer: PByte; const aSize: Integer)procedure Commitprocedure WriteString(const aValue: string)procedure SendRenderStream(aStream: TIWRenderStream)procedure SendStream(aStream: TStream; const aDisableCacheControl: Boolean)procedure SendHsmStream(aStream: THsmStream)procedure SendFile(const aPathname: string; aDelete: Boolean; const aDisableCacheControl: Boolean)procedure SendCacheFile(const aPathname: string)procedure SendRedirect(const aURL: string)procedure ResetReplyType

学其他服务器脚本, 都快习惯了先用 Response 输出点什么, 下面测试了在 IW 中通过 Response 做简单的输出:
{新建 MyIndex 单元, 从 TContentBase 继承实现一个 TMyIndex 类}unit MyIndex;interfaceuses Classes, IW.Content.Base, HTTPApp, IWApplication, IW.HTTP.Request, IW.HTTP.Reply, IWMimeTypes;type  TMyIndex = class(TContentBase)  protected    function Execute(aRequest: THttpRequest; aReply: THttpReply; const aPathname: string; aSession: TIWApplication; aParams: TStrings): Boolean; override;  public    constructor Create; override;  end;implementation{ TMyIndex }constructor TMyIndex.Create;begin  inherited;  mFileMustExist := False;end;function TMyIndex.Execute(aRequest: THttpRequest; aReply: THttpReply; const aPathname: string; aSession: TIWApplication; aParams: TStrings): Boolean;begin  aReply.ContentType := MIME_HTML;  aReply.WriteString(‘<a href="http://www.cnblogs.com/del//del.cnblogs.com">万一的 Delphi 博客</a>‘);  Result := True;end;end. //MyIndex.pas End{在 IWServerControllerBase.OnConfig 中指定为首页, 并命名为 Index.htm}uses  IWInit, IWGlobal, IW.Content.Handlers, MyIndex;procedure TIWServerController.IWServerControllerBaseConfig(Sender: TObject);begin  THandlers.AddStartHandler(‘‘, ‘Index.htm‘, TMyIndex.Create);end;


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