How to know if there is error when downloading files?

[coater]

Sometimes, for some reasons download error may happen. So how to know it, thank you!

------------------------------------
procedure TIinformSearchFrm.Chromium1DownloadUpdated(Sender: TObject;
const browser: ICefBrowser; const downloadItem: ICefDownloadItem;
const callback: ICefDownloadItemCallback);
begin
if downloadItem.IsComplete then
begin
IfNoDown:=true;
end;

end;
------------------------------------

[salvadordf]

Use these events :

• TChromium.OnResourceResponse : Check the HTTP status in response.Status
• TChromium.OnLoadError : Check if the "failedUrl" parameter is one of your downloads.

[coater]

Thank you very much!
Another problem got me there：

Is there another way to download PDF (or acquire PDF doc url to download) when open a web embedded with PDF document?
( not set GlobalCEFApp.DisablePDFExtension to false/not copy file from catch.)
----------------------
ResposeHeader(from web):
cache-control:max-age=3600, private, must-revalidate
content-disposition:inline; filename=jr211.pdf
content-type:application/pdf; charset=UTF-8
date:Thu, 11 Oct 2018 00:06:50 GMT
pragma:
server:AtyponWS/7.1
set-cookie:JSESSIONID=aaat-iAt43LJj-uucg6yw; domain=.onlinelibrary.wiley.com; path=/
set-cookie:cookiePolicy=iaccept; expires=Fri, 12-Oct-2018 00:06:50 GMT
status:200
strict-transport-security:max-age=16070400
x-content-type-options:nosniff
x-frame-options:SAMEORIGIN
x-webstats-respid:a237cd931a4d34739c13754a69b8f5cf
x-xss-protection:1; mode=block
---------------------

Mine:
----------------------
procedure TMiniBrowserFrm.Chromium1BeforeBrowse(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame;
const request: ICefRequest; user_gesture, isRedirect: Boolean;
out Result: Boolean);
begin

if ansipos('pdfKeyWord', Request.Url)<>0 then
begin
showmessage(Request.Url);
Chromium1.StopLoad;
Chromium1.StartDownload(Request.Url)
end;

end;
----------------------

[salvadordf]

Use the TChromium.OnResourceResponse event and check the content-type header in the response parameter.
If it contains "application/pdf" then you can copy the url from the request.

[coater]

Thank you very much!

[coater]

Use the TChromium.OnResourceResponse event and check the content-type header in the response parameter.
If it contains "application/pdf" then you can copy the url from the request.

----------------------------------
procedure TIinformSearchFrm.Chromium1ResourceResponse(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame;
const request: ICefRequest; const response: ICefResponse;
out Result: Boolean);

begin
if ansipos('application/pdf', response.GetHeader('content-type') ) > 0 then
begin
Chromium1.StopLoad;
Chromium1.StartDownload(request.Url) ;
end;
end;
---------------------------------
If I do that, Many same files will be download.
Is it because of the procedure of ChromiumResourceResponse also been tripped by download?
How to avoid this? (I try the following way and it works. Is there another better way? )
Thank you very much!



------------------------------------
procedure Chromium1BeforeBrowse(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame;
const request: ICefRequest; user_gesture, isRedirect: Boolean;
out Result: Boolean);
begin
// memo1.Lines.Add(request.Url) ;
if ansipos('.',DownPdfUrl)>0 then // or length(DownPdfUrl)>0
begin
Chromium1.StopLoad;
Chromium1.StartDownload(DownPdfUrl) ;
DownPdfUrl:='';
end;

end;

procedure Chromium1ResourceResponse(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame;
const request: ICefRequest; const response: ICefResponse;
out Result: Boolean);

begin
memo1.Lines.Add(response.GetHeader('content-type') ) ;
memo1.Lines.Add( browser.MainFrame.Url ) ;
memo1.Lines.Add(request.Url ) ;
memo1.Lines.Add(response.URL ) ;
if ansipos('application/pdf', response.GetHeader('content-type') )>0 then
begin
DownPdfUrl:=request.Url ;
end;
end;

-------------------------------------

[salvadordf]

Is it because of the procedure of ChromiumResourceResponse also been tripped by download?
How to avoid this? (I try the following way and it works. Is there another better way? )

Use a second TChromium component for the file downloads or keep a copy of the URLs that you are currently downloading to ignore that event if it has the same URL.

[coater]

Thank you very much for your kind help!

[coater]

Is this a bug?

visit:
epdf


there is no file was downloaded but 'ChromiumBeforeDownload' will be triggered.

[salvadordf]

That website seems to have an embedded PDF viewer.

I wouldn't be surprised if one of the scripts downloads the original PDF to show it and maybe this is what your app is detecting. Perhaps your app is starting a file download when a resource with a PDF content-type is detected.