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Added more comments to ResponseFilterBrowser and fixed a couple of bugs

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- Move unit in the "uses" section.
- Return RESPONSE_FILTER_DONE when all data has been written.
This commit is contained in:
Salvador Díaz Fau 2018-08-07 17:03:13 +02:00
parent 9d1c1ac052
commit a6d948a5c4
2 changed files with 24 additions and 9 deletions
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4
demos/ResponseFilterBrowser/uResponseFilterBrowser.dfm
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@ -50,7 +50,7 @@ object ResponseFilterBrowserFrm: TResponseFilterBrowserFrm
Margins.Right = 5
Align = alClient
TabOrder = 0
Text = 'https://www.wikipedia.org/'
Text = 'https://www.briskbard.com'
ExplicitHeight = 21
end
object Panel1: TPanel
@ -88,7 +88,7 @@ object ResponseFilterBrowserFrm: TResponseFilterBrowserFrm
Height = 20
Align = alRight
TabOrder = 1
Text = 'index-475f3bca23.js'
Text = 'script.js'
ExplicitHeight = 21
end
end

29
demos/ResponseFilterBrowser/uResponseFilterBrowser.pas
View File

@ -44,13 +44,12 @@ interface
uses
{$IFDEF DELPHI16_UP}
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls, System.SyncObjs,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls, System.SyncObjs, Vcl.ComCtrls,
{$ELSE}
Windows, Messages, SysUtils, Variants, Classes, Graphics,
Controls, Forms, Dialogs, StdCtrls, ExtCtrls, SyncObjs,
Controls, Forms, Dialogs, StdCtrls, ExtCtrls, SyncObjs, ComCtrls,
{$ENDIF}
uCEFChromium, uCEFWindowParent, uCEFInterfaces, uCEFConstants, uCEFTypes, uCEFResponseFilter,
Vcl.ComCtrls;
uCEFChromium, uCEFWindowParent, uCEFInterfaces, uCEFConstants, uCEFTypes, uCEFResponseFilter;
const
STREAM_COPY_COMPLETE = WM_APP + $B00;
@ -147,6 +146,19 @@ uses
// 2. TChromium.OnClose sends a CEFBROWSER_DESTROY message to destroy CEFWindowParent1 in the main thread, which triggers the TChromium.OnBeforeClose event.
// 3. TChromium.OnBeforeClose sets FCanClose := True and sends WM_CLOSE to the form.
// TCustomResponseFilter.OnFilter event might be called multiple times when the resource is too big. In that case the resource will be split into
// "chunks of data" and each chunk will be passed in the "data_in" parameter.
// For example, if the original resource is 95 Kb long you could see that the TCustomResponseFilter.OnFilter event is triggered 10 times with
// different "data_in_size" values.
// 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
// "aResult" to RESPONSE_FILTER_DONE when you write the last chunk of the new resource.
// 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
// "aResult" to RESPONSE_FILTER_NEED_MORE_DATA in the last chunk of the original resource. This will trigger the TCustomResponseFilter.OnFilter event
// again and you will be able to send another chunk.
procedure TResponseFilterBrowserFrm.Filter_OnFilter(Sender: TObject;
data_in : Pointer;
data_in_size : NativeUInt;
@ -193,9 +205,12 @@ begin
// Send the STREAM_COPY_COMPLETE message only if the server sent the data size in
// a Content-Length header and we can compare it with the stream size
if not(FRscCompleted) and (FRscSize <> -1) and (FRscSize = FStream.Size) then
FRscCompleted := PostMessage(Handle, STREAM_COPY_COMPLETE, 0, 0);
aResult := RESPONSE_FILTER_NEED_MORE_DATA;
begin
FRscCompleted := PostMessage(Handle, STREAM_COPY_COMPLETE, 0, 0);
aResult := RESPONSE_FILTER_DONE;
end
else
aResult := RESPONSE_FILTER_NEED_MORE_DATA;
end;
end;
except