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The ResponseFilterBrowser demo now supports multiple data chunks
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Salvador Díaz Fau
267
demos/ResponseFilterBrowser/uResponseFilterBrowser.pas
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267
demos/ResponseFilterBrowser/uResponseFilterBrowser.pas
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// ************************************************************************
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// ***************************** CEF4Delphi *******************************
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// ************************************************************************
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//
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// CEF4Delphi is based on DCEF3 which uses CEF3 to embed a chromium-based
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// browser in Delphi applications.
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//
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// The original license of DCEF3 still applies to CEF4Delphi.
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//
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// For more information about CEF4Delphi visit :
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// https://www.briskbard.com/index.php?lang=en&pageid=cef
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//
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// Copyright � 2018 Salvador D�az Fau. All rights reserved.
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//
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// ************************************************************************
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// ************ vvvv Original license and comments below vvvv *************
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// ************************************************************************
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(*
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* Delphi Chromium Embedded 3
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*
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* Usage allowed under the restrictions of the Lesser GNU General Public License
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* or alternatively the restrictions of the Mozilla Public License 1.1
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
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* the specific language governing rights and limitations under the License.
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*
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* Unit owner : Henri Gourvest <hgourvest@gmail.com>
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* Web site : http://www.progdigy.com
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* Repository : http://code.google.com/p/delphichromiumembedded/
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* Group : http://groups.google.com/group/delphichromiumembedded
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*
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* Embarcadero Technologies, Inc is not permitted to use or redistribute
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* this source code without explicit permission.
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*
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*)
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unit uResponseFilterBrowser;
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{$I cef.inc}
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interface
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uses
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{$IFDEF DELPHI16_UP}
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Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
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Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls, System.SyncObjs,
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{$ELSE}
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Windows, Messages, SysUtils, Variants, Classes, Graphics,
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Controls, Forms, Dialogs, StdCtrls, ExtCtrls, SyncObjs,
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{$ENDIF}
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uCEFChromium, uCEFWindowParent, uCEFInterfaces, uCEFConstants, uCEFTypes, uCEFResponseFilter;
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const
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STREAM_COPY_COMPLETE = WM_APP + $B00;
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type
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TResponseFilterBrowserFrm = class(TForm)
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AddressPnl: TPanel;
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AddressEdt: TEdit;
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GoBtn: TButton;
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Timer1: TTimer;
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Chromium1: TChromium;
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CEFWindowParent1: TCEFWindowParent;
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Splitter1: TSplitter;
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Memo1: TMemo;
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procedure GoBtnClick(Sender: TObject);
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procedure FormShow(Sender: TObject);
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procedure Timer1Timer(Sender: TObject);
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procedure Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
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procedure Chromium1GetResourceResponseFilter(Sender: TObject;
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const browser: ICefBrowser; const frame: ICefFrame;
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const request: ICefRequest; const response: ICefResponse;
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out Result: ICefResponseFilter);
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procedure FormCreate(Sender: TObject);
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procedure FormDestroy(Sender: TObject);
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protected
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FFilter : ICefResponseFilter;
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FStream : TMemoryStream;
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FStreamCS : TCriticalSection;
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FRscName : string;
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procedure WMMove(var aMessage : TWMMove); message WM_MOVE;
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procedure WMMoving(var aMessage : TMessage); message WM_MOVING;
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procedure WMEnterMenuLoop(var aMessage: TMessage); message WM_ENTERMENULOOP;
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procedure WMExitMenuLoop(var aMessage: TMessage); message WM_EXITMENULOOP;
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procedure BrowserCreatedMsg(var aMessage : TMessage); message CEF_AFTERCREATED;
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procedure StreamCopyCompleteMsg(var aMessage : TMessage); message STREAM_COPY_COMPLETE;
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procedure Filter_OnFilter(Sender: TObject; data_in: Pointer; data_in_size: NativeUInt; var data_in_read: NativeUInt; data_out: Pointer; data_out_size : NativeUInt; var data_out_written: NativeUInt; var aResult : TCefResponseFilterStatus);
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public
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{ Public declarations }
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end;
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var
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ResponseFilterBrowserFrm: TResponseFilterBrowserFrm;
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implementation
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{$R *.dfm}
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uses
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{$IFDEF DELPHI16_UP}
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System.Math,
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{$ELSE}
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Math,
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{$ENDIF}
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uCEFApplication, uCEFMiscFunctions;
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// This demo uses a TCustomResponseFilter to read the contents from a JavaScript file in wikipedia.org into a TMemoryStream.
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// The stream is shown in the TMemo when it's finished.
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// For more information read the CEF3 code comments here :
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// https://github.com/chromiumembedded/cef/blob/master/include/capi/cef_response_filter_capi.h
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procedure TResponseFilterBrowserFrm.Filter_OnFilter(Sender: TObject;
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data_in : Pointer;
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data_in_size : NativeUInt;
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var data_in_read : NativeUInt;
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data_out : Pointer;
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data_out_size : NativeUInt;
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var data_out_written : NativeUInt;
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var aResult : TCefResponseFilterStatus);
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begin
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try
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try
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// This event will be called repeatedly until the input buffer has been fully read.
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// When there's no more data then data_in is nil and you can show the stream contents.
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FStreamCS.Acquire;
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if (data_in = nil) then
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begin
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data_in_read := 0;
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data_out_written := 0;
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aResult := RESPONSE_FILTER_DONE;
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PostMessage(Handle, STREAM_COPY_COMPLETE, 0, 0);
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end
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else
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begin
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if (data_out <> nil) then
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begin
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data_out_written := min(data_in_read, data_out_size);
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Move(data_in^, data_out^, data_out_written);
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end;
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data_in_read := FStream.Write(data_in^, data_in_size);
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aResult := RESPONSE_FILTER_NEED_MORE_DATA;
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end;
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except
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on e : exception do
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begin
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aResult := RESPONSE_FILTER_ERROR;
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if CustomExceptionHandler('TResponseFilterBrowserFrm.Filter_OnFilter', e) then raise;
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end;
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end;
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finally
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FStreamCS.Release;
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end;
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end;
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procedure TResponseFilterBrowserFrm.FormCreate(Sender: TObject);
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begin
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FRscName := 'index-47f5f07682.js'; // JS script used at wikipedia.org
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FStream := TMemoryStream.Create;
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FStreamCS := TCriticalSection.Create;
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FFilter := TCustomResponseFilter.Create;
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// This event will receive the data
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TCustomResponseFilter(FFilter).OnFilter := Filter_OnFilter;
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end;
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procedure TResponseFilterBrowserFrm.FormDestroy(Sender: TObject);
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begin
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FFilter := nil;
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FStream.Free;
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FStreamCS.Free;
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end;
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procedure TResponseFilterBrowserFrm.FormShow(Sender: TObject);
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begin
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// GlobalCEFApp.GlobalContextInitialized has to be TRUE before creating any browser
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// If it's not initialized yet, we use a simple timer to create the browser later.
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if not(Chromium1.CreateBrowser(CEFWindowParent1)) then Timer1.Enabled := True;
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end;
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procedure TResponseFilterBrowserFrm.Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
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begin
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// Now the browser is fully initialized we can send a message to the main form to load the initial web page.
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PostMessage(Handle, CEF_AFTERCREATED, 0, 0);
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end;
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procedure TResponseFilterBrowserFrm.Chromium1GetResourceResponseFilter(Sender : TObject;
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const browser : ICefBrowser;
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const frame : ICefFrame;
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const request : ICefRequest;
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const response : ICefResponse;
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out Result : ICefResponseFilter);
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begin
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if (request <> nil) and (pos(FRscName, request.URL) > 0) then
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Result := FFilter
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else
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Result := nil;
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end;
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procedure TResponseFilterBrowserFrm.BrowserCreatedMsg(var aMessage : TMessage);
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begin
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Caption := 'Response Filter Browser';
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AddressPnl.Enabled := True;
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GoBtn.Click;
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end;
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procedure TResponseFilterBrowserFrm.StreamCopyCompleteMsg(var aMessage : TMessage);
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begin
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try
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FStreamCS.Acquire;
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FStream.Seek(0, soBeginning);
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Memo1.Lines.Clear;
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Memo1.Lines.LoadFromStream(FStream);
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FStream.Clear;
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finally
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FStreamCS.Release;
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end;
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end;
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procedure TResponseFilterBrowserFrm.GoBtnClick(Sender: TObject);
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begin
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Chromium1.LoadURL(AddressEdt.Text);
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end;
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procedure TResponseFilterBrowserFrm.Timer1Timer(Sender: TObject);
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begin
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Timer1.Enabled := False;
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if not(Chromium1.CreateBrowser(CEFWindowParent1)) and not(Chromium1.Initialized) then
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Timer1.Enabled := True;
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end;
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procedure TResponseFilterBrowserFrm.WMMove(var aMessage : TWMMove);
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begin
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inherited;
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if (Chromium1 <> nil) then Chromium1.NotifyMoveOrResizeStarted;
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end;
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procedure TResponseFilterBrowserFrm.WMMoving(var aMessage : TMessage);
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begin
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inherited;
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if (Chromium1 <> nil) then Chromium1.NotifyMoveOrResizeStarted;
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end;
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procedure TResponseFilterBrowserFrm.WMEnterMenuLoop(var aMessage: TMessage);
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begin
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inherited;
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if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := True;
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end;
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procedure TResponseFilterBrowserFrm.WMExitMenuLoop(var aMessage: TMessage);
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begin
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inherited;
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if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := False;
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end;
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end.
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