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https://github.com/salvadordf/CEF4Delphi.git
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Added option to replace a resource in ResponseFilterBrowser
- Added more comments to ResponseFilterBrowser
This commit is contained in:
Salvador Díaz Fau
parent
a6d948a5c4
commit
17a3b8e61c
File diff suppressed because it is too large
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@ -45,9 +45,10 @@ uses
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{$IFDEF DELPHI16_UP}
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Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
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Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls, System.SyncObjs, Vcl.ComCtrls,
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Vcl.Imaging.pngimage,
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{$ELSE}
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Windows, Messages, SysUtils, Variants, Classes, Graphics,
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Controls, Forms, Dialogs, StdCtrls, ExtCtrls, SyncObjs, ComCtrls,
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Controls, Forms, Dialogs, StdCtrls, ExtCtrls, SyncObjs, ComCtrls, pngimage,
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{$ENDIF}
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uCEFChromium, uCEFWindowParent, uCEFInterfaces, uCEFConstants, uCEFTypes, uCEFResponseFilter;
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@ -64,31 +65,29 @@ type
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Splitter1: TSplitter;
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Panel1: TPanel;
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GoBtn: TButton;
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Label1: TLabel;
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RscNameEdt: TEdit;
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Panel2: TPanel;
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Memo1: TMemo;
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StatusBar1: TStatusBar;
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procedure GoBtnClick(Sender: TObject);
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procedure Timer1Timer(Sender: TObject);
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Image1: TImage;
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CopyScriptBtn: TRadioButton;
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ReplaceLogoBtn: TRadioButton;
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procedure Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
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procedure Chromium1GetResourceResponseFilter(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const response: ICefResponse; out Result: ICefResponseFilter);
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procedure Chromium1ResourceLoadComplete(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const response: ICefResponse; status: TCefUrlRequestStatus; receivedContentLength: Int64);
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procedure Chromium1BeforePopup(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; const targetUrl, targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean; const popupFeatures: TCefPopupFeatures; var windowInfo: TCefWindowInfo; var client: ICefClient; var settings: TCefBrowserSettings; var noJavascriptAccess: Boolean; var Result: Boolean);
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procedure Chromium1Close(Sender: TObject; const browser: ICefBrowser; out Result: Boolean);
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procedure Chromium1BeforeClose(Sender: TObject; const browser: ICefBrowser);
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procedure Chromium1LoadStart(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; transitionType: Cardinal);
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procedure FormShow(Sender: TObject);
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procedure FormCreate(Sender: TObject);
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procedure FormDestroy(Sender: TObject);
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procedure Chromium1BeforePopup(Sender: TObject;
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const browser: ICefBrowser; const frame: ICefFrame; const targetUrl,
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targetFrameName: ustring;
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targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean;
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const popupFeatures: TCefPopupFeatures; var windowInfo: TCefWindowInfo;
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var client: ICefClient; var settings: TCefBrowserSettings;
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var noJavascriptAccess: Boolean; var Result: Boolean);
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procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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procedure Chromium1Close(Sender: TObject; const browser: ICefBrowser;
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out Result: Boolean);
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procedure Chromium1BeforeClose(Sender: TObject;
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const browser: ICefBrowser);
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procedure GoBtnClick(Sender: TObject);
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procedure Timer1Timer(Sender: TObject);
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protected
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FFilter : ICefResponseFilter; // CEF Filter interface that receives the resource contents
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FStream : TMemoryStream; // TMemoryStream to hold the resource contents
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@ -98,6 +97,8 @@ type
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FRscEncoding : TEncoding; // The resource response Encoding. When encoding is unicode. The response data may be sent by multi chains, will cause encoding parsing problem.
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FRscMimeType : String;
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FFilterInit : boolean;
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FReload : boolean;
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// Variables to control when can we destroy the form safely
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FCanClose : boolean; // Set to True in TChromium.OnBeforeClose
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FClosing : boolean; // Set to True in the CloseQuery event.
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@ -112,6 +113,8 @@ type
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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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procedure CopyScript(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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procedure ReplaceLogo(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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procedure UpdateRscEncoding(const aMimeType, aContentType : string);
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function IsMyResource(const aRequest : ICefRequest) : boolean;
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procedure GetResponseEncoding(const aContentType: string);
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@ -134,32 +137,43 @@ uses
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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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// This demo uses a TCustomResponseFilter to read the contents from a
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// JavaScript file in briskbard.com into a TMemoryStream. The stream
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// 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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// Destruction steps
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// =================
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// 1. FormCloseQuery sets CanClose to FALSE calls TChromium.CloseBrowser which triggers the TChromium.OnClose event.
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// 2. TChromium.OnClose sends a CEFBROWSER_DESTROY message to destroy CEFWindowParent1 in the main thread, which triggers the TChromium.OnBeforeClose event.
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// 3. TChromium.OnBeforeClose sets FCanClose := True and sends WM_CLOSE to the form.
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// 1. FormCloseQuery sets CanClose to FALSE calls TChromium.CloseBrowser
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// which triggers the TChromium.OnClose event.
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// 2. TChromium.OnClose sends a CEFBROWSER_DESTROY message to destroy
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// CEFWindowParent1 in the main thread, which triggers the
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// TChromium.OnBeforeClose event.
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// 3. TChromium.OnBeforeClose sets FCanClose := True and sends WM_CLOSE
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// to the form.
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// TCustomResponseFilter.OnFilter event might be called multiple times when the resource is too big. In that case the resource will be split into
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// TCustomResponseFilter.OnFilter event might be called multiple times
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// when the resource is too big. In that case the resource will be split into
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// "chunks of data" and each chunk will be passed in the "data_in" parameter.
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// For example, if the original resource is 95 Kb long you could see that the TCustomResponseFilter.OnFilter event is triggered 10 times with
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// different "data_in_size" values.
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// For example, if the original resource is 95 Kb long you could see that the
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// TCustomResponseFilter.OnFilter event is triggered 10 times with different
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// "data_in_size" values.
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// If you replace the original resource with a shorter resource then you might need less chucks to send the data. In that case you would just set
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// "aResult" to RESPONSE_FILTER_DONE when you write the last chunk of the new resource.
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// If you replace the original resource with a shorter resource then you might
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// need less chunks to send the data. In that case you would just set
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// "aResult" to RESPONSE_FILTER_DONE when you write the last chunk of the new
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// resource.
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// If you replace the original resource with a larger resource then you might need more chunks to send all the data. In that case you would set
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// "aResult" to RESPONSE_FILTER_NEED_MORE_DATA in the last chunk of the original resource. This will trigger the TCustomResponseFilter.OnFilter event
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// again and you will be able to send another chunk.
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// If you replace the original resource with a larger resource then you might
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// need more chunks to send all the data. In that case you would set "aResult"
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// to RESPONSE_FILTER_NEED_MORE_DATA in the last chunk of the original resource.
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// This will trigger the TCustomResponseFilter.OnFilter event again and you
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// will be able to send another chunk.
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procedure TResponseFilterBrowserFrm.Filter_OnFilter(Sender: TObject;
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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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@ -167,6 +181,20 @@ procedure TResponseFilterBrowserFrm.Filter_OnFilter(Sender: TObject;
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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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if CopyScriptBtn.Checked then
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CopyScript(data_in, data_in_size, data_in_read, data_out, data_out_size, data_out_written, aResult)
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else
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ReplaceLogo(data_in, data_in_size, data_in_read, data_out, data_out_size, data_out_written, aResult);
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end;
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procedure TResponseFilterBrowserFrm.CopyScript( 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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@ -179,7 +207,7 @@ begin
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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_in_read := 0; // data_in_size is 0 too in this situation
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data_out_written := 0;
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aResult := RESPONSE_FILTER_DONE;
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@ -199,25 +227,82 @@ begin
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Move(data_in^, data_out^, data_out_written);
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end;
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if (data_in_size > 0) then
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data_in_read := FStream.Write(data_in^, data_in_size);
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if (data_in_size > 0) then
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data_in_read := FStream.Write(data_in^, data_in_size);
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// Send the STREAM_COPY_COMPLETE message only if the server sent the data size in
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// a Content-Length header and we can compare it with the stream size
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if not(FRscCompleted) and (FRscSize <> -1) and (FRscSize = FStream.Size) then
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begin
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FRscCompleted := PostMessage(Handle, STREAM_COPY_COMPLETE, 0, 0);
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aResult := RESPONSE_FILTER_DONE;
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end
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// Send the STREAM_COPY_COMPLETE message only if the server sent the data size in
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// a Content-Length header and we can compare it with the stream size
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if not(FRscCompleted) and (FRscSize <> -1) and (FRscSize = FStream.Size) then
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begin
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FRscCompleted := PostMessage(Handle, STREAM_COPY_COMPLETE, 0, 0);
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aResult := RESPONSE_FILTER_DONE;
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end
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else
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aResult := RESPONSE_FILTER_NEED_MORE_DATA;
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end;
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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.CopyScript', 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.ReplaceLogo( 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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// The default return value is RESPONSE_FILTER_DONE to stop the filter
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aResult := RESPONSE_FILTER_DONE;
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try
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try
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FStreamCS.Acquire;
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// FStream has the new logo and it has a much larger size than the original so we'll have to
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// return RESPONSE_FILTER_NEED_MORE_DATA until we send all its contents.
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if FFilterInit and (FStream <> nil) and (FStream.Size > 0) then
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begin
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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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if (data_in = nil) and (FStream.Position >= FStream.Size) then
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begin
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// This is the last filter call
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data_in_read := 0; // data_in_size is 0 too in this situation
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data_out_written := 0;
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// Send the message only if this is the first time that this event has data_in = nil
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if not(FRscCompleted) then
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FRscCompleted := PostMessage(Handle, STREAM_COPY_COMPLETE, 0, 0);
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end
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else
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if (data_out <> nil) then
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begin
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data_in_read := data_in_size;
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data_out_written := FStream.Read(data_out^, data_out_size); // Write the next chunk with a data_out_size size at most.
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if not(FRscCompleted) and (FStream.Position >= FStream.Size) then
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FRscCompleted := PostMessage(Handle, STREAM_COPY_COMPLETE, 0, 0)
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else
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aResult := RESPONSE_FILTER_NEED_MORE_DATA;
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aResult := RESPONSE_FILTER_NEED_MORE_DATA; // We still need to send more stream data
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end;
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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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if CustomExceptionHandler('TResponseFilterBrowserFrm.ReplaceLogo', e) then raise;
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end;
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end;
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finally
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@ -229,12 +314,18 @@ function TResponseFilterBrowserFrm.IsMyResource(const aRequest : ICefRequest) :
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var
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TempName : string;
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begin
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TempName := trim(RscNameEdt.Text);
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Result := False;
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if (aRequest <> nil) and (length(TempName) > 0) then
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Result := (pos(TempName, aRequest.URL) > 0)
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if CopyScriptBtn.Checked then
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begin
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TempName := trim(RscNameEdt.Text);
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if (aRequest <> nil) and (length(TempName) > 0) then
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Result := (pos(TempName, aRequest.URL) > 0);
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end
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else
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Result := False;
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Result := (aRequest <> nil) and
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(CompareText(aRequest.URL, 'https://www.briskbard.com/images/logo.png') = 0);
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end;
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procedure TResponseFilterBrowserFrm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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@ -251,6 +342,7 @@ end;
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procedure TResponseFilterBrowserFrm.FormCreate(Sender: TObject);
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begin
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FReload := False;
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FFilterInit := False;
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FRscCompleted := False;
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FRscSize := -1;
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@ -361,6 +453,26 @@ begin
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Result := nil;
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end;
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procedure TResponseFilterBrowserFrm.Chromium1LoadStart( Sender : TObject;
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const browser : ICefBrowser;
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const frame : ICefFrame;
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transitionType : Cardinal);
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begin
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if frame.IsMain then
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try
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FStreamCS.Acquire;
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FStream.Clear;
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if ReplaceLogoBtn.Checked then
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begin
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Image1.Picture.SavetoStream(FStream);
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FStream.Seek(0, soBeginning);
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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.UpdateRscEncoding(const aMimeType, aContentType : string);
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begin
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FRscMimeType := aMimeType;
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@ -386,7 +498,7 @@ begin
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// In case the server didn't send a Content-Length header
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// and CEF didn't send a data_in = nil in Filter_OnFilter
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// we still can use this event to know when the resource is complete
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if IsMyResource(request) then
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if IsMyResource(request) and CopyScriptBtn.Checked then
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begin
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UpdateRscEncoding(response.MimeType, response.GetHeader('Content-Type'));
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@ -420,42 +532,47 @@ begin
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try
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FStreamCS.Acquire;
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if (FStream.Size > 0) then
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if CopyScriptBtn.Checked then
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begin
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FStream.Seek(0, soBeginning);
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Memo1.Lines.Clear;
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if (FRscMimeType = 'application/json') or
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(FRscMimeType = 'text/json') or
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(FRscMimeType = 'text/javascript') or
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(FRscMimeType = 'application/javascript') then
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if (FStream.Size > 0) then
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begin
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StatusBar1.Panels[1].Text := 'Stream size : ' + inttostr(FStream.Size);
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FStream.Seek(0, soBeginning);
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SetLength(LAS, FStream.Size);
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FStream.Read(LAS[Low(LAS)], FStream.Size);
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Memo1.Lines.Clear;
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if (FRscEncoding = TEncoding.UTF8) then
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LS := UTF8Decode(LAS) // UTF8 Here
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if (FRscMimeType = 'application/json') or
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(FRscMimeType = 'text/json') or
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(FRscMimeType = 'text/javascript') or
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(FRscMimeType = 'application/javascript') then
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begin
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StatusBar1.Panels[1].Text := 'Stream size : ' + inttostr(FStream.Size);
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SetLength(LAS, FStream.Size);
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FStream.Read(LAS[Low(LAS)], FStream.Size);
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if (FRscEncoding = TEncoding.UTF8) then
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LS := UTF8Decode(LAS) // UTF8 Here
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else
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LS := string(LAS); // Others encoding text
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Memo1.Lines.Add(LS);
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StatusBar1.Panels[2].Text := 'Decoded size : ' + inttostr(length(LS));
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end
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else
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LS := string(LAS); // Others encoding text
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Memo1.Lines.LoadFromStream(FStream); // Image or others
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Memo1.Lines.Add(LS);
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StatusBar1.Panels[3].Text := 'Memo size : ' + inttostr(length(trim(Memo1.Lines.Text)));
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StatusBar1.Panels[2].Text := 'Decoded size : ' + inttostr(length(LS));
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// There might be a small difference in sizes because of the text decoding
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FStream.Clear;
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end
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else
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Memo1.Lines.LoadFromStream(FStream); // Image or others
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StatusBar1.Panels[3].Text := 'Memo size : ' + inttostr(length(trim(Memo1.Lines.Text)));
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// There might be a small difference in sizes because of the text decoding
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FStream.Clear;
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Memo1.Lines.Clear;
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end
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else
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Memo1.Lines.Clear;
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StatusBar1.Panels[1].Text := 'Stream size : ' + inttostr(FStream.Size);
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finally
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FStreamCS.Release;
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end;
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@ -479,7 +596,20 @@ begin
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FStreamCS.Release;
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end;
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Chromium1.LoadURL(AddressEdt.Text);
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||||
|
||||
// In this demo we just reload the same web page ignoring the cache because the filter only works
|
||||
// if the resources are downloaded, not if they are read from the cache.
|
||||
// If you need to add this code to your app set some custom HTTP headers to download all
|
||||
// resources in all cases.
|
||||
|
||||
if FReload then
|
||||
Chromium1.ReloadIgnoreCache
|
||||
else
|
||||
begin
|
||||
FReload := True;
|
||||
GoBtn.Caption := 'Reload';
|
||||
Chromium1.LoadURL(AddressEdt.Text);
|
||||
end;
|
||||
end;
|
||||
|
||||
procedure TResponseFilterBrowserFrm.Timer1Timer(Sender: TObject);
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user