BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to make TIdHTTP::Get() show it's current progress-state?          BorlandTalk.com Forum Index -> C++ Builder (Internet Web) View previous topic :: View next topic   Author Message MR Guest Posted: Mon Feb 13, 2006 8:03 pm    Post subject: How to make TIdHTTP::Get() show it's current progress-state? Is there a way to make TIdHTTP::Get() show it's current progress-state, like it is displayed in IE when downloading a file? I tried to modify my current code TFileStream *stream=new TFileStream(dst_file, fmCreate|fmShareDenyRead); try { TIdHTTP->Get(_web_address, stream); } ... in the hope I can limit the stream's buffer to a certain number of bytes and recall Get() again until the whole file is donwloaded, but unfortunately without success. Naturally I'm not too fixed on TIdHTTP::Get. If there is another way with which this is possible, please let me know... Thanks a lot, Michael Back to top Remy Lebeau (TeamB) Guest Posted: Tue Feb 14, 2006 12:03 am    Post subject: Re: How to make TIdHTTP::Get() show it's current progress-st <MR> wrote in message news:rpl1v11s7qjgne4qgo2ihebrn2of6sg3iu (AT) 4ax (DOT) com... Quote: Is there a way to make TIdHTTP::Get() show it's current progress-state, like it is displayed in IE when downloading a file? Use the OnWork events to update your own progress UI. Quote: TFileStream *stream=new TFileStream(dst_file, fmCreate|fmShareDenyRead); You cannot specify any flags with fmCreate. They will be ignored, and the file will always be opened with exclusive access. Gambit Back to top MR Guest Posted: Tue Feb 14, 2006 8:03 am    Post subject: Re: How to make TIdHTTP::Get() show it's current progress-st "Remy Lebeau \(TeamB\)" <no.spam (AT) no (DOT) spam.com> schrieb: Quote: MR> wrote in message news:rpl1v11s7qjgne4qgo2ihebrn2of6sg3iu (AT) 4ax (DOT) com... Is there a way to make TIdHTTP::Get() show it's current progress-state, like it is displayed in IE when downloading a file? Use the OnWork events to update your own progress UI. Oh, thank you, that works fine. Is there a way to find out how many bytes to be read at all. This would allow to use a progress-bar, displaying the progress in percent. Thank you, Michael Back to top Remy Lebeau (TeamB) Guest Posted: Tue Feb 14, 2006 10:03 am    Post subject: Re: How to make TIdHTTP::Get() show it's current progress-st <MR> wrote in message news:uaq2v1pj3n56hemn0hjimm4cpacb8rnibg (AT) 4ax (DOT) com... Quote: Is there a way to find out how many bytes to be read at all. Yes, but not 100% reliably. There is the TIdHTTP.Response.ContentLength property, but it is only valid if the server reported the file's length ahead of time. Depending on how the file is being transferred internally (chunked, compressed, etc), the file's length is not always available. Gambit Back to top MR Guest Posted: Wed Feb 15, 2006 8:03 am    Post subject: Re: How to make TIdHTTP::Get() show it's current progress-st Quote: Yes, but not 100% reliably. There is the TIdHTTP.Response.ContentLength property, but it is only valid if the server reported the file's length ahead of time. Depending on how the file is being transferred internally (chunked, compressed, etc), the file's length is not always available. This works fine, thank you. Fortunately/Unfurtunately with my tries I get always(!) useful information in TIdHTTP.Response.ContentLength, I suppose TIdHTTP.Response.ContentLength has a value of 0, if the real size could not be find out in advance!? Is this assumption correct or is there another way? Thanks, Michael Back to top Remy Lebeau (TeamB) Guest Posted: Wed Feb 15, 2006 7:03 pm    Post subject: Re: How to make TIdHTTP::Get() show it's current progress-st <MR> wrote in message news:okj5v11entds8ea5fs7q8u8n1j2ve1sj33 (AT) 4ax (DOT) com... Quote: Fortunately/Unfurtunately with my tries I get always(!) useful information in TIdHTTP.Response.ContentLength That is not always guaranteed. Quote: I suppose TIdHTTP.Response.ContentLength has a value of 0 if the real size could not be find out in advance!? No. It will be -1 , not 0, if the 'Content-Length' header is not present. Also, the HasContentLength property will be False, in which case the value of the ContentLength property has to be ignored. Gambit Back to top MR Guest Posted: Wed Feb 15, 2006 8:03 pm    Post subject: Re: How to make TIdHTTP::Get() show it's current progress-st Thank you... Back to top MR Guest Posted: Sat Feb 18, 2006 2:03 pm    Post subject: Re: How to make TIdHTTP::Get() show it's current progress-st Sorry, I thought I now know all, but there is still one thing: is there a way to get the ContentLength without trying to get 'Get()' the whole file. I was looking for a kind of 'bool &Stop'-argument in the OnWorkBegin/OnWork()-methods of TIdHTTP, but did not found anything. Than I tried to raise/catch an exception from TIdHTTP::WorkStart, after I got the ContentLength from OnWorkBegin() to stop the downloading-process, but now get some strange Timeout-Exceptions (after a time >2min) and suppose this might be the reason. Probably that's a bad way and there is a much better one... Thanks a lot, Michael Back to top Remy Lebeau (TeamB) Guest Posted: Sat Feb 18, 2006 8:03 pm    Post subject: Re: How to make TIdHTTP::Get() show it's current progress-st <MR> wrote in message news:2h7ev1h8dng1re80ip1cmk1luibgrv7cfs (AT) 4ax (DOT) com... Quote: is there a way to get the ContentLength without trying to get 'Get()' the whole file. Use the Head() method. The HEAD command retreives just the headers, whereas the GET command retreives the headers and the content. Quote: I was looking for a kind of 'bool &Stop'-argument in the OnWorkBegin/OnWork()-methods of TIdHTTP, but did not found anything. There is nothing in Indy 9 for that. In Indy 10, there is a new OnHeadersAvailable event which has a VContinue parameter. Gambit Back to top MR Guest Posted: Sun Feb 19, 2006 1:03 am    Post subject: Re: How to make TIdHTTP::Get() show it's current progress-st All works now fine and it seems indeed that this strange delay when trying to get the the ContentLength-information came from my exception-construct in the OnWorkBegin(). As I've head in another thread Indy10 does not work with BDS2006's BCB-personality. Thanks a lot, Michael Back to top Remy Lebeau (TeamB) Guest Posted: Sun Feb 19, 2006 2:03 am    Post subject: Re: How to make TIdHTTP::Get() show it's current progress-st <MR> wrote in message news:necfv1lle4i8o7r2gavmm2jn3jlfr1ig0m (AT) 4ax (DOT) com... Quote: As I've head in another thread Indy10 does not work with BDS2006's BCB-personality. It will be shortly. 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