Dcef3 How to use filters,The following code and some can and some can not be opened

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procedure TChromiumPage.ChromiumGetResourceHandler(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest;
out Result: ICefResourceHandler);
var
  CefRH: ICefResourceHandler;
begin
  if frame.IsMain and GetPostFileNameOk(request.url) then
  begin
    CefRH := TMyPowerScheme.Create(browser, frame, '', request);
    Result := CefRH;
 end;
end;








//{UnitMyFileScheme begin}----------------------------------------------
{$IFDEF FPC}
{$MODE DELPHI}{$H+}
{$ENDIF}
unit UnitMyFileScheme;

{$WARN SYMBOL_PLATFORM OFF}

interface

uses ceflib, Classes, Vcl.Dialogs;

type
  TMyPowerScheme = class;

  TMyCefUrlrequestClientOwn = class(TCefUrlrequestClientOwn)
  private

  protected
    procedure OnRequestComplete(const request: ICefUrlRequest); override;
    procedure OnUploadProgress(const request: ICefUrlRequest;
      current, total: UInt64); override;
    procedure OnDownloadProgress(const request: ICefUrlRequest;
      current, total: UInt64); override;
    procedure OnDownloadData(const request: ICefUrlRequest; data: Pointer;
      dataLength: NativeUInt); override;
  public
    statusText: ustring;
    _resourceHandler: TMyPowerScheme;
    _response: ICefResponse;
    _dataLength: UInt64;
    m_url: ustring;
    constructor Create; override;
(a_uploadTotal,a_downloadTotal:UInt64;a_frame:ICefFrame;a_url:ustring);
    destructor Destroy; override;
  end;

  TMyPowerScheme = class(TCefResourceHandlerOwn)
  private
    FPath: string;
    FStatus: Integer;
    FStatusText: string;
    FMimeType: string;

    Fbrowser: ICefBrowser;
    Fframe: ICefFrame;
    FschemeName: ustring;
    Frequest: ICefRequest;

    // CefUrlrequest: ICefUrlRequest; // TCefUrlRequestRef
    // CefRequest: ICefRequest;
    // CefurlrequestClient: ICefUrlrequestClient; // TCefUrlrequestClientOwn
    _responseHeadersReadyCallback: ICefCallback;
    _webRequestClient: TMyCefUrlrequestClientOwn;
    _webRequest: ICefUrlRequest;
    // _offsetRead: UInt64;
  protected
    function ProcessRequest(const request: ICefRequest;
      const callback: ICefCallback): Boolean; override;
    procedure GetResponseHeaders(const response: ICefResponse;
      out responseLength: Int64; out redirectUrl: ustring); override;
    function ReadResponse(const dataOut: Pointer; bytesToRead: Integer;
      var bytesRead: Integer; const callback: ICefCallback): Boolean; override;
    function CanGetCookie(const cookie: PCefCookie): Boolean; override;
    function CanSetCookie(const cookie: PCefCookie): Boolean; override;
    procedure Cancel; override;
  public
    FDataStream: TMemoryStream;
    constructor Create(const browser: ICefBrowser; const frame: ICefFrame;
      const schemeName: ustring; const request: ICefRequest); override;
    destructor Destroy; override;
  end;

implementation

uses Windows, SysUtils, Registry, Contnrs, UnitMain, UnitChromiumTools;

function HTTPDecode(const AStr: ustring): rbstring;
var
  Sp, Rp, Cp: PAnsiChar;
  src: rbstring;
begin
  src := rbstring(AStr);
  SetLength(Result, Length(src));
  Sp := PAnsiChar(src);
  Rp := PAnsiChar(Result);
  while Sp^ <> #0 do
  begin
    case Sp^ of
      '+':
        Rp^ := ' ';
      '%':
        begin
          Inc(Sp);
          if Sp^ = '%' then
            Rp^ := '%'
          else
          begin
            Cp := Sp;
            Inc(Sp);
            if (Cp^ <> #0) and (Sp^ <> #0) then
              Rp^ := AnsiChar(StrToInt('$' + Char(Cp^) + Char(Sp^)))
            else
            begin
              Result := '';
              Exit;
            end;
          end;
        end;
    else
      Rp^ := Sp^;
    end;
    Inc(Rp);
    Inc(Sp);
  end;
  SetLength(Result, Rp - PAnsiChar(Result));
end;

function ParseFileUrl(const url: ustring): ustring;
label
  error;
var
  p, s: PWideChar;
  state: Integer;
begin
  p := PWideChar(url);
  s := nil;
  state := 0;
  while True do
  begin
    case state of
      0:
        case p^ of
          ':':
            state := 1;
          #0:
            goto error;
        end;
      1:
        if p^ = '/' then
          state := 2
        else
          goto error;
      2:
        if p^ = '/' then
        begin
          state := 3;
          s := p;
        end
        else
          goto error;
      3:
        case p^ of
          '/':
            begin
              p[-1] := ':';
              p^ := '\';
              state := 4;
            end;
          #0:
            goto error;
        else
          p[-1] := p^;
        end;
      4:
        begin
          case p^ of
            '/':
              p^ := '\';
            #0:
{$IFDEF UNICODE}
              Exit(ustring(HTTPDecode(string(UTF8String(s)))));
{$ELSE}
              begin
                Result := UTF8Decode(HTTPDecode(s));
                Exit;
              end;
{$ENDIF}
          end;
        end;
    end;
    Inc(p);
  end;
error:
  Result := '';
end;

{ TMyFileScheme }

procedure TMyPowerScheme.Cancel;
begin
  inherited;

end;

function TMyPowerScheme.CanGetCookie(const cookie: PCefCookie): Boolean;
begin
  // TCefCookie(cookie^).name
  Result := True;
end;

function TMyPowerScheme.CanSetCookie(const cookie: PCefCookie): Boolean;
begin
  Result := True;
end;

constructor TMyPowerScheme.Create(const browser: ICefBrowser;
  const frame: ICefFrame; const schemeName: ustring;
  const request: ICefRequest);
begin
  inherited;
  FDataStream := TMemoryStream.Create;
  Fbrowser := browser;
  Fframe := frame;
  FschemeName := schemeName;
  Frequest := request;
end;

destructor TMyPowerScheme.Destroy;
begin
  if FDataStream <> nil then
    FDataStream.Free;
  inherited;
end;

procedure TMyPowerScheme.GetResponseHeaders(const response: ICefResponse;
  out responseLength: Int64; out redirectUrl: ustring);
var
  wrcResponse: ICefResponse;
  headerMap: ICefStringMultimap;
begin
  // inherited;
  // response.Status := FStatus;
  // response.StatusText := FStatusText;
  // response.MimeType := FMimeType;
  // responseLength := FDataStream.Size;
  {
    response.Status := CefUrlrequest.GetResponse.Status;
    response.StatusText := CefUrlrequest.GetResponse.StatusText;
    response.MimeType := CefUrlrequest.GetResponse.MimeType;
  }
  // showmessage(CefUrlrequest.GetResponse.StatusText);
  // sleep(9000);
  // response.Status := 200;
  // response.StatusText := 'OK';
  // response.MimeType := 'text/html';
  // responseLength := FDataStream.Size;
  // responseLength := 1985;

  wrcResponse := self._webRequestClient._response;
  if not assigned(wrcResponse) then
    Exit;
  response.Status := wrcResponse.Status;
  response.statusText := wrcResponse.statusText;
  response.MimeType := wrcResponse.MimeType;

  headerMap := TCefStringMultimapOwn.Create;
  wrcResponse.GetHeaderMap(headerMap);
  response.SetHeaderMap(headerMap);
  //headerMap := nil;

  // ----------------------------------------------------------------------------
  { headerMap := TCefStringMultimapOwn.Create;
    if assigned(headerMap.Handle) then
    begin
    wrcResponse.GetHeaderMap(headerMap); // ??????????
    response.SetHeaderMap(headerMap);    // ??????????
    end;
  }
  // ----------------------------------------------------------------------------

  responseLength := self._webRequestClient._dataLength;
  // responseLength := self._webRequestClient.FDataStream.Size;
  responseLength := self.FDataStream.Size;
  self._webRequestClient._dataLength := 0;
  (*
  MainForm.Memo1.Lines.Add('GetResponseHeaders->responseLength=' +
    IntToStr(responseLength));
  MainForm.Memo1.Lines.Add('GetResponseHeaders->response=' +
    response.statusText);
  MainForm.Memo1.Lines.Add('GetResponseHeaders->GetHeader=' +
    response.GetHeader('Content-Type'));
  MainForm.Memo1.Lines.Add('GetResponseHeaders->GetHeader=' +
    response.GetHeader('Content-Length'));
    *)

end;

function TMyPowerScheme.ProcessRequest(const request: ICefRequest;
  const callback: ICefCallback): Boolean;
var
  RequestHead: ICefStringMultimap;
begin
  RequestHead := TCefStringMultimapOwn.Create;
  request.GetHeaderMap(RequestHead);
  RequestHead.Append('Accept-LanguageX', 'zh-CN,zh;q=0.8');
  // RequestHead.Value[RequestHead.FindCount('')] := '';
  request.SetHeaderMap(RequestHead);
  RequestHead := nil;

  //FDataStream := TMemoryStream.Create;
  self._responseHeadersReadyCallback := callback;
  self._webRequestClient := TMyCefUrlrequestClientOwn.Create;
  self._webRequestClient._resourceHandler := self;
  self._webRequestClient.m_url := request.url;
  _webRequest := TCefUrlRequestRef.New(request, self._webRequestClient);
  // MainForm.Memo1.Lines.Add('TMyPowerScheme_ProcessRequest:' + request.url);
  // MainForm.Memo1.Lines.Add('ProcessRequest->' + ParseFileUrl(request.url));
  Result := True;
  // callback.Cont;
end;

function TMyPowerScheme.ReadResponse(const dataOut: Pointer;
  bytesToRead: Integer; var bytesRead: Integer;
  const callback: ICefCallback): Boolean;
begin
  // FDataStream.Position := 0;
  // MainForm.Memo1.Lines.Add('ReadResponse:bytesRead'+IntToStr(bytesRead));
  // bytesRead := FDataStream.Read(dataOut^, bytesToRead);
  // TMemoryStream(FDataStream).Clear;
  // Result := True;
  // callback.Cont;
  // inherited;
  // if self._offsetRead < self._webRequestClient._dataLength then

  //不能这样写，不能访问self._webRequestClient._dataLength
  //if  self._webRequestClient._dataLength > 0  then
  if   bytesToRead > 0  then
  begin
    // self._webRequestClient.FDataStream.Position := 0;
    // bytesRead := self._webRequestClient.FDataStream.Read(dataOut^, bytesToRead);
    // self._webRequestClient.FDataStream.Clear;
    self.FDataStream.Position := 0;
    //bytesRead := self.FDataStream.Read(dataOut^, bytesToRead);
    bytesRead := self.FDataStream.Read(dataOut^, self.FDataStream.Size);
    self.FDataStream.Position := 0;
    self.FDataStream.SaveToFile(ExtractFilePath(ParamStr(0)) +'download\' +GetPostFileName(Frequest.Url));
    self.FDataStream.Position := 0;
    self.FDataStream.Clear;
    //self._webRequestClient._dataLength := 0;
    self._webRequestClient := nil;
    Result := True;
  end  else
  begin
    // self._clientHandler._ReleaseStrongReference(self);
    self._webRequestClient := nil;
    //self._webRequestClient._dataLength := 0;
    Result := False;
  end;
  callback.Cont;
end;






{ TMyCefUrlrequestClientOwn }

constructor TMyCefUrlrequestClientOwn.Create;
begin
  inherited;
  self._dataLength := 0;
end;

destructor TMyCefUrlrequestClientOwn.Destroy;
begin
  inherited;
end;

procedure TMyCefUrlrequestClientOwn.OnDownloadData(const request
  : ICefUrlRequest; data: Pointer; dataLength: NativeUInt);
begin
  // inherited;
  // self._data := self._data + string(data);
  // self.FDataStream.Write(data, dataLength);
  // self.FDataStream.Write(data, dataLength);
  // self._dataLength := self._dataLength + dataLength;
  self._resourceHandler.FDataStream.Write(data, dataLength);
  self._dataLength := self._dataLength + dataLength;
  // m_downloadData := copy(data,0,dataLength);
  // MainForm.Memo1.Lines.Add('OnDownloadData' + IntToStr(dataLength));
end;

procedure TMyCefUrlrequestClientOwn.OnDownloadProgress(const request
  : ICefUrlRequest; current, total: UInt64);
begin
  // inherited;
  //MainForm.Memo1.Lines.Add('OnDownloadProgress' + IntToStr(current) + ':' + IntToStr(total));
end;

const
  RequestStatusText: array [0 .. 4] of string = ('Unknown', 'Success',
    'Pending', 'Canceled', 'Failed');

procedure TMyCefUrlrequestClientOwn.OnRequestComplete(const request
  : ICefUrlRequest);
begin
  // FDataStream.Position := 0;
  // TMemoryStream(FDataStream).SaveToFile('aaa.html');
  // TMemoryStream(FDataStream).Clear;
  // MainForm.Memo1.Lines.Add('OnRequestComplete');
  // m_frame.LoadString(m_downloadData, '');
  // inherited;
  // if (request.GetRequestStatus() is TCefUrlRequestStatus) then
  self._response := request.GetResponse;
  // self._resourceHandler.
  {
    self._data := self._resourceHandler._clientHandler._OnResourceResponse(
    self._resourceHandler._browser,
    self._resourceHandler._frame,
    request.GetRequest(),
    request.GetRequestStatus(),
    request.GetRequestError(),
    request.GetResponse(),
    self._data);
  }
  // self._dataLength := length(self._data);
  // self._dataLength := FDataStream.Size;
  // FDataStream.Position := 0;
  // FDataStream.SaveToFile(ExtractFilePath(ParamStr(0)) + GetPostFileName(m_url));
  // FDataStream.Position := 0;
  self._resourceHandler.FDataStream.Position := 0;
  //self._resourceHandler.FDataStream.SaveToFile(ExtractFilePath(ParamStr(0)) +'download\' +GetPostFileName(m_url));
  self._resourceHandler.FDataStream.Position := 0;
  self._resourceHandler._responseHeadersReadyCallback.Cont;
end;

procedure TMyCefUrlrequestClientOwn.OnUploadProgress(const request
  : ICefUrlRequest; current, total: UInt64);
begin
  //inherited;
  //MainForm.Memo1.Lines.Add('OnUploadProgress' + IntToStr(current) + ':' + IntToStr(total));
end;

initialization

CefUserAgent :=
  'Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1788.0 Safari/537.36';


end.
//{UnitMyFileScheme end}----------------------------------------------

Original issue reported on code.google.com by scnclis...@163.com on 22 May 2014 at 7:43

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[deleted comment]

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Original comment by hgourv...@gmail.com on 1 Mar 2015 at 11:21

• Changed state: Invalid