delphi 如何解析网址？

演示：

unit Unit3;

interface

uses

Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,

Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type

TForm3 = class(TForm)

Memo1: TMemo;

procedure FormCreate(Sender: TObject);

private

{ Private declarations }

public

{ Public declarations }

end;

var

Form3: TForm3;

implementation

{$R *.dfm}

uses

IdURI;

procedure TForm3.FormCreate(Sender: TObject);

var

URI: TIdURI;

begin

URI := TIdURI.Create('http://login:password@somehost.somedomain.com:8080/some_path/something_else.html?param1=val¶m2=val');

try

// Protocol = URI.Protocol

// Username = URI.Username

// Password = URI.Password

// Host = URI.Host

// Port = URI.Port

// Path = URI.Path

// Query = URI.Params

Memo1.Lines.Add(URI.Protocol);

Memo1.Lines.Add(URI.Username);

Memo1.Lines.Add(URI.Password);

Memo1.Lines.Add(URI.Host);

Memo1.Lines.Add(URI.Port);

Memo1.Lines.Add(URI.Path);

Memo1.Lines.Add(URI.Params);

finally

URI.Free;

end;

end.

另外一个方案：

{$APPTYPE CONSOLE}

uses
  Windows,
  SysUtils,
  WinInet;

procedure ParseURL(const lpszUrl: string);
var
  lpszScheme      : array[0..INTERNET_MAX_SCHEME_LENGTH - 1] of Char;
  lpszHostName    : array[0..INTERNET_MAX_HOST_NAME_LENGTH - 1] of Char;
  lpszUserName    : array[0..INTERNET_MAX_USER_NAME_LENGTH - 1] of Char;
  lpszPassword    : array[0..INTERNET_MAX_PASSWORD_LENGTH - 1] of Char;
  lpszUrlPath     : array[0..INTERNET_MAX_PATH_LENGTH - 1] of Char;
  lpszExtraInfo   : array[0..1024 - 1] of Char;
  lpUrlComponents : TURLComponents;
begin
  ZeroMemory(@lpszScheme, SizeOf(lpszScheme));
  ZeroMemory(@lpszHostName, SizeOf(lpszHostName));
  ZeroMemory(@lpszUserName, SizeOf(lpszUserName));
  ZeroMemory(@lpszPassword, SizeOf(lpszPassword));
  ZeroMemory(@lpszUrlPath, SizeOf(lpszUrlPath));
  ZeroMemory(@lpszExtraInfo, SizeOf(lpszExtraInfo));
  ZeroMemory(@lpUrlComponents, SizeOf(TURLComponents));

  lpUrlComponents.dwStructSize      := SizeOf(TURLComponents);
  lpUrlComponents.lpszScheme        := lpszScheme;
  lpUrlComponents.dwSchemeLength    := SizeOf(lpszScheme);
  lpUrlComponents.lpszHostName      := lpszHostName;
  lpUrlComponents.dwHostNameLength  := SizeOf(lpszHostName);
  lpUrlComponents.lpszUserName      := lpszUserName;
  lpUrlComponents.dwUserNameLength  := SizeOf(lpszUserName);
  lpUrlComponents.lpszPassword      := lpszPassword;
  lpUrlComponents.dwPasswordLength  := SizeOf(lpszPassword);
  lpUrlComponents.lpszUrlPath       := lpszUrlPath;
  lpUrlComponents.dwUrlPathLength   := SizeOf(lpszUrlPath);
  lpUrlComponents.lpszExtraInfo     := lpszExtraInfo;
  lpUrlComponents.dwExtraInfoLength := SizeOf(lpszExtraInfo);

  InternetCrackUrl(PChar(lpszUrl), Length(lpszUrl), ICU_DECODE or ICU_ESCAPE, lpUrlComponents);

  Writeln(Format('Protocol : %s',[lpszScheme]));
  Writeln(Format('Host     : %s',[lpszHostName]));
  Writeln(Format('User     : %s',[lpszUserName]));
  Writeln(Format('Password : %s',[lpszPassword]));
  Writeln(Format('Path     : %s',[lpszUrlPath]));
  Writeln(Format('ExtraInfo: %s',[lpszExtraInfo]));
end;

begin
  try
   ParseURL('http://login:password@somehost.somedomain.com/some_path/something_else.html?param1=val¶m2=val');
  except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;
  readln;
end.
这将返回
Protocol : http
Host     : somehost.somedomain.com
User     : login
Password : password
Path     : /some_path/something_else.html
ExtraInfo: ?param1=val¶m2=val

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