How do I clear the cache and cookies for an embedded Chromium browser?
Solution 1
DCEF1:
To delete cookies in DCEF1 wrapper there's the DeleteCookies
function in ICefCookieManager
manager interface. However, I've tried the following code to delete all cookies, but it always failed to me:
procedure TForm1.Button1Click(Sender: TObject);
var
CookieManager: ICefCookieManager;
begin
CookieManager := TCefCookieManagerRef.GetGlobalManager;
if not CookieManager.DeleteCookies('', '') then
ShowMessage('DeleteCookies failed!');
end;
Fortunately, there is another option to delete cookies using this cookie manager. Visit all of them and in the visitor function assign True to the deleteCookie
output parameter. Be careful with getting cookie manager, it's created the first time you navigate somewhere (the GetGlobalManager
class function is unsafe, it's not properly handled for unexpected result), so be sure you'll use this code after navigation:
procedure TForm1.Button1Click(Sender: TObject);
var
CookieManager: ICefCookieManager;
begin
CookieManager := TCefCookieManagerRef.GetGlobalManager;
CookieManager.VisitAllCookiesProc(
function(const name, value, domain, path: ustring; secure, httponly,
hasExpires: Boolean; const creation, lastAccess, expires: TDateTime;
count, total: Integer; out deleteCookie: Boolean): Boolean
begin
deleteCookie := True;
ShowMessage('A cookie from domain ' + domain + ' will be unmercifully ' +
'deleted!');
end
);
end;
DCEF3:
In DCEF3 wrapper you can use the following. Credit goes to Eric Santos:
type
CefTask = class(TCefTaskOwn)
procedure Execute; override;
end;
procedure CefTask.Execute;
var
CookieManager: ICefCookieManager;
begin
CookieManager := TCefCookieManagerRef.Global;
CookieManager.DeleteCookies('', '');
end;
procedure ClearCookies;
var
Task: CefTask;
begin
Task := CefTask.Create;
CefPostTask(TID_IO, Task);
end;
Solution 2
TLama your help was decisive for my project. I am grateful for sharing your experience.
Solved my problem with this code:
procedure TForm1.Button1Click(Sender: TObject);
var
CookieManager: ICefCookieManager;
begin
CookieManager := TCefCookieManagerRef.GetGlobalManager;
CookieManager.VisitAllCookiesProc(
function(const name, value, domain, path: ustring; secure, httponly,
hasExpires: Boolean; const creation, lastAccess, expires: TDateTime;
count, total: Integer; out deleteCookie: Boolean): Boolean
begin
deleteCookie := True;
ShowMessage('A cookie from domain ' + domain + ' will be unmercifully ' +
'deleted!');
end
);
end;
hug
Junior Miguel Vieira
Updated on June 05, 2022Comments
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Junior Miguel Vieira over 1 year
I created a browser with TChromium. The TChromium is created dynamically. Facebook access (login) At the end of the process, the component is destroyed. The problem occurs when the component is created again He continues with the previous session (login). I need to clean all cache and cookies. (Force Log out)
Below the code I create the component by:
var Chromium: TChromium; begin try Chromium := TChromium.Create(nil); Chromium.SetParentComponent(Form1); Chromium.Align := alClient; chromium.Browser.MainFrame.LoadUrl('www.facebook.com');
I destroy it and release memory like this:
FreeAndNil(Chromium)
What should I do?
-
Junior Miguel Vieira about 11 yearsHello @TLama! You use what version of dcef?
-
TLama about 11 yearsHi, I'm using one of the most recent ones from SVN, revision 147.
-
TLama about 11 yearsYou can get it from the URL
mentioned here
but you will need to use some of the SVN clients to get it, likeTortoiseSVN
or similar (e.g.some portable
SVN client). Otherwise you would have to download all the files from thesource trunk tree
. -
Junior Miguel Vieira about 11 yearsOkay and you? I downloaded the source with SVN and not yet tested. When you inform test. Grateful for help
-
TLama about 11 yearsI'm curious if won't be needed to clear the cache as well (except cookies), but something tells me that it should be enough. I've tested this with StackOverflow and it worked fine. Let me know after when you test it, please. Thanks!
-
TLama about 11 years@Christian, add
ceflib
to your uses clause. If you already have it, then update Chromium to a recent version (what I would suggest in any case). Anyway, there's a brandnew version
of Chromium, but I haven't time to check what's new there. -
Christian about 11 yearsI just checked again, this class only exists in DCEF3, not r306. I'm switching to DCEF3...
-
Admin about 10 years@TLama Can you update answer for how to use DeleteCookies() in DCEF3?
-
TLama about 10 years@Eric, if I'd know how, I would post an answer to
your question
, but unfortunately I don't, and I'm busy right now to study this topic deeper. Sorry. -
TLama about 10 years@Eric, thanks! I've kept the original
DeleteCookies
option, because there was originally a bug in DCEF1 wrapper.ICefCookieManager::DeleteCookies
should work, and maybe already works in recent DCEF1 version (I don't know, but I hope :-). Just a small hint, you don't need to implement methods where you just callinherited
because they do effectively nothing but calling it's ancestor's methods. -
Admin about 10 years@TLama Actually I don't need this now. Because I use Indy. I've perfected it now. Each thread syncs with global cookiemanager. :)