jvmultihttpgrabber.pas

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{-----------------------------------------------------------------------------
The contents of this file are subject to the Mozilla Public License
Version 1.1 (the "License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/MPL-1.1.html

Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either expressed or implied. See the License for
the specific language governing rights and limitations under the License.

The Original Code is: JvMultiHTTPGrabber.PAS, released on 2001-02-28.

The Initial Developer of the Original Code is S閎astien Buysse [sbuysse att buypin dott com]
Portions created by S閎astien Buysse are Copyright (C) 2001 S閎astien Buysse.
All Rights Reserved.

Contributor(s): Michael Beck [mbeck att bigfoot dott com].

Last Modified: 2000-02-28

You may retrieve the latest version of this file at the Project JEDI's JVCL home page,
located at http://jvcl.sourceforge.net

Known Issues:
-----------------------------------------------------------------------------}

{$I jvcl.inc}

{$HPPEMIT '#pragma link "wininet.lib"'}

unit JvMultiHTTPGrabber;

interface

uses
  Windows, SysUtils, Classes, WinInet,
  JvTypes, JvComponent;

type
  TUrlEvent = procedure(Sender: TObject; UserData: Integer; Url: string) of object;
  TUrlEventError = procedure(Sender: TObject; UserData: Integer;
    Url: string; Error: string) of object;
  TUrlResolved = procedure(Sender: TObject; UserData: Integer; Url: string; Name: string) of object;
  TUrlRedirect = procedure(Sender: TObject; UserData: Integer;
    Url: string; NewUrl: string) of object;
  TUrlSent = procedure(Sender: TObject; UserData: Integer;
    Url: string; DataSize: Integer) of object;
  TJvDoneFileEvent = procedure(Sender: TObject; UserData: Integer; FileName: string;
    FileSize: Integer; Url: string) of object;
  TJvDoneStreamEvent = procedure(Sender: TObject; UserData: Integer; Stream: TStream;
    StreamSize: Integer; Url: string) of object;
  TDateEvent = procedure(Sender: TObject; UserData: Integer; FileDate: TDateTime;
    Url: string) of object;

  TJvMultiHTTPGrabber = class(TJvComponent)
  private
    FAgent: string;
    FUrl: string;
    FReferer: string;
    FPassword: string;
    FUserName: string;
    FOutputMode: TJvOutputMode;
    FFileName: TFileName;
    FOnDoneFile: TJvDoneFileEvent;
    FOnDoneStream: TJvDoneStreamEvent;
    FOnProgress: TJvHTTPProgressEvent;
    FOnReceived: TUrlSent;
    FOnReceivingResponse: TUrlEvent;
    FOnClosed: TUrlEvent;
    FOnConnecting: TUrlEvent;
    FOnResolving: TUrlEvent;
    FOnRedirect: TUrlRedirect;
    FOnConnected: TUrlEvent;
    FOnResolved: TUrlResolved;
    FOnClosing: TUrlEvent;
    FOnRequestComplete: TUrlEvent;
    FOnRequestSent: TUrlSent;
    FOnSendingRequest: TUrlEvent;
    FOnError: TUrlEventError;
    FCount: Integer;
    FOnDateRetrieved: TDateEvent;
    function GetWorking: Boolean;
    procedure RaiseWebError(Infos: Pointer);
  protected
    procedure RaiseError(Value: Pointer);
    function StartConnection(UserData: Integer; IgnoreMessages: Boolean = False): Pointer;
    procedure StopConnection(Infos: Pointer);
    procedure ThreadTerminated(Sender: TObject);
    procedure ThreadDateTerminated(Sender: TObject);
  public
    constructor Create(AOwner: TComponent); override;
    procedure Download(UserData: Integer = 0);
    procedure GetFileAge(UserData: Integer = 0);
    property DownloadCount: Integer read FCount;
  published
    property Agent: string read FAgent write FAgent;
    property FileName: TFileName read FFileName write FFileName;
    property OutputMode: TJvOutputMode read FOutputMode write FOutputMode default omStream;
    property Password: string read FPassword write FPassword;
    property Referer: string read FReferer write FReferer;
    property Url: string read FUrl write FUrl;
    property UserName: string read FUserName write FUserName;
    property Working: Boolean read GetWorking;
    property OnClosingConnection: TUrlEvent read FOnClosing write FOnClosing;
    property OnClosedConnection: TUrlEvent read FOnClosed write FOnClosed;
    property OnConnectingToServer: TUrlEvent read FOnConnecting write FOnConnecting;
    property OnConnectedToServer: TUrlEvent read FOnConnected write FOnConnected;
    property OnDoneFile: TJvDoneFileEvent read FOnDoneFile write FOnDoneFile;
    property OnDoneStream: TJvDoneStreamEvent read FOnDoneStream write FOnDoneStream;
    property OnError: TUrlEventError read FOnError write FOnError;
    property OnProgress: TJvHTTPProgressEvent read FOnProgress write FOnProgress;
    property OnReceivingResponse: TUrlEvent read FOnReceivingResponse write FOnReceivingResponse;
    property OnReceivedResponse: TUrlSent read FOnReceived write FOnReceived;
    property OnRedirect: TUrlRedirect read FOnRedirect write FOnRedirect;
    property OnRequestComplete: TUrlEvent read FOnRequestComplete write FOnRequestComplete;
    property OnRequestSent: TUrlSent read FOnRequestSent write FOnRequestSent;
    property OnResolvingName: TUrlEvent read FOnResolving write FOnResolving;
    property OnResolvedName: TUrlResolved read FOnResolved write FOnResolved;
    property OnSendingRequest: TUrlEvent read FOnSendingRequest write FOnSendingRequest;
    property OnDateRetrieved: TDateEvent read FOnDateRetrieved write FOnDateRetrieved;
  end;

implementation

uses
  JvResources;

type
  PRequestInfos = ^TRequestInfos;
  TRequestInfos = record
    Url: string;
    Filename:string;
    OutputMode: TJvOutputMode;
    hSession: HINTERNET;
    hHostConnect: HINTERNET;
    hRequest: HINTERNET;
    FileSize: Integer;
    IgnoreMsg: Boolean;
    Grabber: TJvMultiHTTPGrabber;
    UserData: Integer;
  end;

  TJvMultiHttpThread = class(TThread)
  private
    FInfos: Pointer;
    FPosition: Integer;
    FContinue: Boolean;
    FStream: TMemoryStream;
  protected
    procedure Execute; override;
    procedure Progress;
    procedure Error;
  public
    constructor Create(Value: Pointer);
    destructor Destroy; override;
  end;

  TJvMultiDateHttpThread = class(TThread)
  private
    FInfos: Pointer;
    FValue: TDateTime;
  protected
    procedure Execute; override;
    procedure Error;
  public
    constructor Create(Value: Pointer);
  end;

//=== TJvMultiHTTPGrabber ====================================================

constructor TJvMultiHTTPGrabber.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FOutputMode := omStream;
  FAgent := RsMultiAgent;
  FCount := 0;
end;

procedure StatusCallback(Handle: HInternet; Context: DWord;
  Status: DWord; Info: Pointer; StatLen: DWord); stdcall;
begin
  with PRequestInfos(Context)^ do
    if not IgnoreMsg then
      case Status of
        INTERNET_STATUS_CLOSING_CONNECTION:
          if Assigned(Grabber.FOnClosing) then
            Grabber.FOnClosing(Grabber, UserData, Url);
        INTERNET_STATUS_CONNECTED_TO_SERVER:
          if Assigned(Grabber.FOnConnected) then
            Grabber.FOnConnected(Grabber, UserData, Url);
        INTERNET_STATUS_CONNECTING_TO_SERVER:
          if Assigned(Grabber.FOnConnecting) then
            Grabber.FOnConnecting(Grabber, UserData, Url);
        INTERNET_STATUS_NAME_RESOLVED:
          if Assigned(Grabber.FOnResolved) then
            Grabber.FOnResolved(Grabber, UserData, Url, StrPas(PChar(Info)));
        INTERNET_STATUS_RECEIVING_RESPONSE:
          if Assigned(Grabber.FOnReceivingResponse) then
            Grabber.FOnReceivingResponse(Grabber, UserData, Url);
        INTERNET_STATUS_REDIRECT:
          if Assigned(Grabber.FOnRedirect) then
            Grabber.FOnRedirect(Grabber, UserData, Url, StrPas(PChar(Info)));
        INTERNET_STATUS_REQUEST_COMPLETE:
          if Assigned(Grabber.FOnRequestComplete) then
            Grabber.FOnRequestComplete(Grabber, UserData, Url);
        INTERNET_STATUS_REQUEST_SENT:
          if Assigned(Grabber.FOnRequestSent) then
            Grabber.FOnRequestSent(Grabber, UserData, Url, DWORD(Info^));
        INTERNET_STATUS_RESOLVING_NAME:
          if Assigned(Grabber.FOnResolving) then
            Grabber.FOnResolving(Grabber, UserData, Url);
        INTERNET_STATUS_RESPONSE_RECEIVED:
          if Assigned(Grabber.FOnReceived) then
            Grabber.FOnReceived(Grabber, UserData, Url, DWORD(Info^));
        INTERNET_STATUS_SENDING_REQUEST:
          if Assigned(Grabber.FOnSendingRequest) then
            Grabber.FOnSendingRequest(Grabber, UserData, Url);
      end;
end;

procedure TJvMultiHTTPGrabber.Download(UserData: Integer);
var
  Infos: PRequestInfos;
begin
  Infos := StartConnection(UserData, False);
  if Infos <> nil then
    with TJvMultiHttpThread.Create(Infos) do
    begin
      OnTerminate := ThreadTerminated;
      FreeOnTerminate := true;
      Resume;
      Inc(FCount);
    end;
end;

procedure TJvMultiHTTPGrabber.GetFileAge(UserData: Integer = 0);
var
  Infos: PrequestInfos;
begin
  Infos := StartConnection(UserData, True);
  if Infos <> nil then
    with TJvMultiDateHttpThread.Create(Infos) do
    begin
      OnTerminate := ThreadDateTerminated;
      FreeOnTerminate := true;
      Resume;
    end;
end;

function TJvMultiHTTPGrabber.GetWorking: Boolean;
begin
  Result := FCount > 0;
end;

procedure TJvMultiHTTPGrabber.RaiseError(Value: Pointer);
var
  Msg: array [0..256] of Char;
begin
  if Assigned(FOnError) then
    with PRequestInfos(Value)^ do
    begin
      FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nil, GetLastError, 0, Msg,
        SizeOf(Msg), nil);
      FOnError(Self, UserData, Url, Msg);
    end;
end;