BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Access violation when downloading from IdFTPServer          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Hans Frandsen Guest Posted: Mon Oct 27, 2003 10:43 pm    Post subject: Access violation when downloading from IdFTPServer Hello I have experienced an accessviolation in IdFTPServer when downloading a 800 mb test file over internet. Since the file transfer was going the problem can't be in my code (!?!?) since all I do is open the file in a stream. Does anyone have any idea about what I can check/look for? Thanks, Hans Back to top Hans Frandsen Guest Posted: Tue Oct 28, 2003 8:41 pm    Post subject: Re: Access violation when downloading from IdFTPServer Actually it seems to happen when transfer is cancelled or interrupted... Hans Back to top Remy Lebeau (TeamB) Guest Posted: Tue Oct 28, 2003 8:46 pm    Post subject: Re: Access violation when downloading from IdFTPServer "Hans Frandsen" <nospam (AT) nospam (DOT) com> wrote Quote: Actually it seems to happen when transfer is cancelled or interrupted... That is a possibility. TIdFTP does have known problems with abort operations. Gambit Back to top Hans Frandsen Guest Posted: Tue Oct 28, 2003 10:29 pm    Post subject: Re: Access violation when downloading from IdFTPServer And no one is working on fix? Is there something I can do to stop them (access vio) from happening when aborting download? I'm using latest Indy 9 Thanks, Hans "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote Quote: "Hans Frandsen" <nospam (AT) nospam (DOT) com> wrote in message news:3f9ed48b$1 (AT) newsgroups (DOT) borland.com... Actually it seems to happen when transfer is cancelled or interrupted... That is a possibility. TIdFTP does have known problems with abort operations. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Tue Oct 28, 2003 10:42 pm    Post subject: Re: Access violation when downloading from IdFTPServer "Hans Frandsen" <nospam (AT) nospam (DOT) com> wrote Quote: And no one is working on fix? Its hard to fix something when the problem is not known yet. In any case, the abort code is not implemented correctly to begin with, so it needs to be re-written to handle aborts better anyway. Quote: Is there something I can do to stop them (access vio) from happening when aborting download? Doubtful, without knowing where the AV is coming from to being with. There isn't a whole lot going on during a transfer to be a potential source of an AV to begin with. Socket errors, maybe, but not AVs. It would help if you could track down the problem and provide more specific details. Just saying "there is an AV" doesn't really say very much. At least show your actual code that is reproducing the problem in the first place. Gambit Back to top Hans Frandsen Guest Posted: Wed Oct 29, 2003 10:51 am    Post subject: Re: Access violation when downloading from IdFTPServer Ok I will install an exception catcher and try to find out which line of code it happens in then.. Thanks for the reply! Hans "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote Quote: "Hans Frandsen" <nospam (AT) nospam (DOT) com> wrote in message news:3f9eedd9$1 (AT) newsgroups (DOT) borland.com... And no one is working on fix? Its hard to fix something when the problem is not known yet. In any case, the abort code is not implemented correctly to begin with, so it needs to be re-written to handle aborts better anyway. Is there something I can do to stop them (access vio) from happening when aborting download? Doubtful, without knowing where the AV is coming from to being with. There isn't a whole lot going on during a transfer to be a potential source of an AV to begin with. Socket errors, maybe, but not AVs. It would help if you could track down the problem and provide more specific details. Just saying "there is an AV" doesn't really say very much. At least show your actual code that is reproducing the problem in the first place. Gambit Back to top Andrew Fiddian-Green Guest Posted: Wed Oct 29, 2003 1:13 pm    Post subject: Re: Access violation when downloading from IdFTPServer Quote: I will install an exception catcher ---- 1) You should always do that anyway -- see below. 2) Please note that by design, Indy components raise Indy defined exceptions when -- well when exceptions occur. I don't know the FTP component, but from experience with the HTTP components, I would expect Indy to raise an Indy defined exception when the Abort method is called. And your AV is probably a fall through because you are not trapping the Indy exception properly... With Indy you should ALWAYS use the following code template: IndyThing := TIdThing.Create(nil); try try IndyThing.SomeParameter := something; ... IndyThing.DoSomeMethod(...); ... except // handle "normal" exceptions on EIdYourAbortException do; // nothing ?? on EIdSomeOtherException do WarnUser; // generic fall through to handle all other exceptions on exception do Panic; end; finally IndyThing.free; end; Regards, AndrewFG "Hans Frandsen" <nospam (AT) nospam (DOT) com> wrote Quote: Ok I will install an exception catcher and try to find out which line of code it happens in then.. Thanks for the reply! Hans "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote in message news:3f9ef017$1 (AT) newsgroups (DOT) borland.com... "Hans Frandsen" <nospam (AT) nospam (DOT) com> wrote in message news:3f9eedd9$1 (AT) newsgroups (DOT) borland.com... And no one is working on fix? Its hard to fix something when the problem is not known yet. In any case, the abort code is not implemented correctly to begin with, so it needs to be re-written to handle aborts better anyway. Is there something I can do to stop them (access vio) from happening when aborting download? Doubtful, without knowing where the AV is coming from to being with. There isn't a whole lot going on during a transfer to be a potential source of an AV to begin with. Socket errors, maybe, but not AVs. It would help if you could track down the problem and provide more specific details. Just saying "there is an AV" doesn't really say very much. At least show your actual code that is reproducing the problem in the first place. Gambit Back to top Hans Frandsen Guest Posted: Wed Oct 29, 2003 10:12 pm    Post subject: Re: Access violation when downloading from IdFTPServer Well since it isn't in any of my code it happens, I cannot do anything about it. Indy handles all this and the ABORT works most of the time. I think the exception handler is the way to go to uncover where it fails Thanks Hans "Andrew Fiddian-Green" <andrewfg at zugernet dot ch> wrote Quote: I will install an exception catcher ---- 1) You should always do that anyway -- see below. 2) Please note that by design, Indy components raise Indy defined exceptions when -- well when exceptions occur. I don't know the FTP component, but from experience with the HTTP components, I would expect Indy to raise an Indy defined exception when the Abort method is called. And your AV is probably a fall through because you are not trapping the Indy exception properly... With Indy you should ALWAYS use the following code template: IndyThing := TIdThing.Create(nil); try try IndyThing.SomeParameter := something; ... IndyThing.DoSomeMethod(...); ... except // handle "normal" exceptions on EIdYourAbortException do; // nothing ?? on EIdSomeOtherException do WarnUser; // generic fall through to handle all other exceptions on exception do Panic; end; finally IndyThing.free; end; Regards, AndrewFG "Hans Frandsen" <nospam (AT) nospam (DOT) com> wrote in message news:3f9f9bb5$1 (AT) newsgroups (DOT) borland.com... Ok I will install an exception catcher and try to find out which line of code it happens in then.. Thanks for the reply! Hans "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote in message news:3f9ef017$1 (AT) newsgroups (DOT) borland.com... "Hans Frandsen" <nospam (AT) nospam (DOT) com> wrote in message news:3f9eedd9$1 (AT) newsgroups (DOT) borland.com... And no one is working on fix? Its hard to fix something when the problem is not known yet. In any case, the abort code is not implemented correctly to begin with, so it needs to be re-written to handle aborts better anyway. Is there something I can do to stop them (access vio) from happening when aborting download? Doubtful, without knowing where the AV is coming from to being with. There isn't a whole lot going on during a transfer to be a potential source of an AV to begin with. Socket errors, maybe, but not AVs. It would help if you could track down the problem and provide more specific details. Just saying "there is an AV" doesn't really say very much. At least show your actual code that is reproducing the problem in the first place. 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