DownloadFiles

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3 total messages Started by bar Tue, 04 Mar 2008 10:07

#478

Author: bar
Date: Tue, 04 Mar 2008 10:07

53 lines
2100 bytes

Hi Remy,

I am the following code to download files from the
HTTP server. (BCB 6 and Indy 9.? stable version)

TldHTTP is dropped at design time.
Properties set at design time

ConnectTimeout = 0
HandleRedirects = true

Request
    Connection = Keep-Alive

void TForm1::DownloadFile(String URL,AnsiString FileName)
{
    try
    {
        std::auto_ptr<TFileStream> strm(new TFileStream(FileName,fmCreate));

        HTTP->Request->Pragma = "no-cache";
        HTTP->HandleRedirects = true;
        Application->ProcessMessages();
        HTTP->Get(URL, strm.get());
    }
    catch(const Exception &E)
    {
        ShowMessage(E.Message);
    }
}

I call this function repeatedly with different parameter and its working 
fine.

I have some questions

1.I didn't see any Connect()/Disconnect() function in the code but still 
working. How?. Does it makes difference.
2.Is it good to add these statements when exception occurs.
    catch(const Exception &E)
    {
            if(HTTP->Connected())
                HTTP->Disconnect();
            ShowMessage(E.Message);
    }

Finally i want to use this function in a loop. So i want to know the best 
way to code.

All help greatly appreciated.

Thanks
SA

Re: DownloadFiles

#482

Author: Remy Lebeau (TeamB)
Date: Tue, 04 Mar 2008 17:37

15 lines
1262 bytes

"bar" <shaikakbar250281@yahoo.co.in> wrote in message 
news:47cd1f44@newsgroups.borland.com...

> I didn't see any Connect()/Disconnect() function in the code
> but still working. How?

Get() calls them internally for you.

> 2.Is it good to add these statements when exception occurs.

That is not needed.  Get will Disconnect() internally for you.


Gambit

Re: DownloadFiles

#286

Author: bar
Date: Tue, 18 Mar 2008 16:51

31 lines
1584 bytes

Hi Remy thanks for reply.
sorry for the delay

I want to download a file of 100 kb regularly at an interval of 1 minute.

As i see when repeatedly calling function, program is not responding.
I try to represent my code.

void TForm1::DownloadFile(String URL,AnsiString FileName)
{
    try
    {
        std::auto_ptr<TFileStream> strm(new TFileStream(FileName,fmCreate));

        HTTP->Request->Pragma = "no-cache";
        HTTP->HandleRedirects = true;
        HTTP->Get(URL, strm.get());
    }
    catch(const Exception &E)
    {
         return;
    }
}

void __fastcall TForm1::Timer1Timer(TObject *Sender)
{
    DownloadFile("http://url",abc)
}

Thanks
SA

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