Delphi完成斷定網址能否存在及能否可以翻開的辦法。本站提示廣大學習愛好者:(Delphi完成斷定網址能否存在及能否可以翻開的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是Delphi完成斷定網址能否存在及能否可以翻開的辦法正文
本例所述Delphi法式用於檢測網址能否為404,也就是檢測網址能否存在,或能否可以翻開,針對分歧的檢討辦法,會前往分歧的成果。
法式重要代碼以下:
unit address; interface uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, Psock, NMHttp, StdCtrls, ComCtrls; type TForm1 = class(TForm) Label1: TLabel; Edit1: TEdit; Button1: TButton; NMHTTP1: TNMHTTP; StatusBar1: TStatusBar; procedure Button1Click(Sender: TObject); procedure NMHTTP1Success(Cmd: CmdType); procedure NMHTTP1Failure(Cmd: CmdType); procedure NMHTTP1HostResolved(Sender: TComponent); procedure NMHTTP1InvalidHost(var Handled: Boolean); procedure NMHTTP1AuthenticationNeeded(Sender: TObject); procedure NMHTTP1Connect(Sender: TObject); procedure NMHTTP1ConnectionFailed(Sender: TObject); procedure FormActivate(Sender: TObject); procedure FormClose(Sender: TObject; var Action: TCloseAction); procedure NMHTTP1Redirect(var Handled: Boolean); procedure Edit1KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState); private { Private declarations } public { Public declarations } end; var Form1: TForm1; implementation {$R *.DFM} procedure TForm1.Button1Click(Sender: TObject); var url:string; begin url:=Edit1.Text; StatusBar1.simpletext:='正在磨練'; NMHTTP1.Head(url); end; procedure TForm1.NMHTTP1Success(Cmd: CmdType); begin case cmd of CmdHEAD: StatusBar1.SimpleText:='網址准確' end; end; procedure TForm1.NMHTTP1Failure(Cmd: CmdType); begin case cmd of CmdHEAD: StatusBar1.SimpleText:='網址不准確,沒有這個頁面' end; end; procedure TForm1.NMHTTP1HostResolved(Sender: TComponent); begin StatusBar1.SimpleText:='准確解析主機名'; end; procedure TForm1.NMHTTP1InvalidHost(var Handled: Boolean); begin StatusBar1.SimpleText:='不克不及解析主機名'; end; procedure TForm1.NMHTTP1AuthenticationNeeded(Sender: TObject); begin StatusBar1.SimpleText:='須要身份驗證'; end; procedure TForm1.NMHTTP1Connect(Sender: TObject); begin StatusBar1.SimpleText:='銜接到主機'; end; procedure TForm1.NMHTTP1ConnectionFailed(Sender: TObject); begin StatusBar1.SimpleText:='銜接主機掉敗'; end; procedure TForm1.FormActivate(Sender: TObject); begin Edit1.Text:='http://www.'; end; procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction); begin NMHTTP1.Destroy; end; procedure TForm1.NMHTTP1Redirect(var Handled: Boolean); begin StatusBar1.SimpleText:='重定向到其它頁面'; end; procedure TForm1.Edit1KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState); begin if Key=VK_RETURN then begin StatusBar1.simpletext:='正在磨練'; NMHTTP1.Head(Edit1.Text); end; end; end.