Download with progressbar
lazarus / 38-Networking and Web Programming

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lazzaro2023 · 2023-02-07 17:56

Hi everyone!!!
I have a problem.
Is it possible to implement a procedure that shows me a progress bar
while I download a file from the internet?
Can someone help me?

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Handoko · 2023-02-07 18:23

Hello lazzaro2023,
Welcome to the forum.

In the link below, you can find "File download" demo in the Networking
category:
https://wiki.freepascal.org/Portal:HowTo_Demos

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dje · 2023-02-07 18:43

I posted a threaded progressbar downloader here:
https://forum.lazarus.freepascal.org/index.php/topic,60314.msg450770.h
tml#msg450770
The actual downloading code is maybe ~150 lines. I couldn't think of a
smaller way of writing one.
I've also attached a project to this post. It should get you started

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lazzaro2023 · 2023-02-09 09:19

Thanks for the posts!!
I need to do the same thing for uploading files.
Can you help me?

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KodeZwerg · 2023-02-09 10:09

Quote from: lazzaro2023 on February 09, 2023, 10:19:25 amCan you help
me?We can try.
Quote from: lazzaro2023 on February 09, 2023, 10:19:25 amI need to do
the same thing for uploading files.Upload to where?
Basics are the same, just easier since a download with a progressbar
can be wrong when the source not tell the real size (for such my
download switch to a marquee and still tells in how fast it is)
So have your progressbar updated after each chunk you uploaded.

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lazzaro2023 · 2023-02-09 11:02

Quote from: KodeZwerg on February 09, 2023, 11:09:49 amUpload to
where?
Internet
Quote from: KodeZwerg on February 09, 2023, 11:09:49 amBasics are the
same, just easier since a download with a progressbar can be wrong
when the source not tell the real size (for such my download switch to
a marquee and still tells in how fast it is)
So have your progressbar updated after each chunk you uploaded.
You have an example?

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KodeZwerg · 2023-02-09 11:12

Quote from: lazzaro2023 on February 09, 2023, 12:02:44 pmYou have an
example?I just did a quick search on this forum, here is my first hit:
https://forum.lazarus.freepascal.org/index.php/topic,14889.msg79354.ht
ml#msg79354

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KodeZwerg · 2023-02-09 11:16

Quote from: lazzaro2023 on February 09, 2023, 12:02:44 pmQuote from:
KodeZwerg on February 09, 2023, 11:09:49 amUpload to
where?InternetSince "Internet" is no protocol but for transfers you
need a protocol your answer is just .....
So what I showed you in my last post is for the FTP (File Transfer
Protocol)
If that is not what you need, be more specific.

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lazzaro2023 · 2023-02-09 12:20

Quote from: KodeZwerg on February 09, 2023, 12:16:19 pmSince
"Internet" is no protocol but for transfers you need a protocol your
answer is just .....
So what I showed you in my last post is for the FTP (File Transfer
Protocol)
If that is not what you need, be more specific.

I apologize!!!
The protocol is http.

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balazsszekely · 2023-02-09 12:23

Quote from: lazzaro2023 on February 09, 2023, 01:20:41 pmQuote from:
KodeZwerg on February 09, 2023, 12:16:19 pmSince "Internet" is no
protocol but for transfers you need a protocol your answer is just
.....
So what I showed you in my last post is for the FTP (File Transfer
Protocol)
If that is not what you need, be more specific.

I apologize!!!
The protocol is http.
Here you go:
https://forum.lazarus.freepascal.org/index.php/topic,44795.0.html

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lazzaro2023 · 2023-02-09 16:15

Quote from: GetMem on February 09, 2023, 01:23:17 pmHere you go:
https://forum.lazarus.freepascal.org/index.php/topic,44795.0.html
Ok!
Thanks!
But there is no possibility to monitor with a progressbar the upload
of the file ...

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balazsszekely · 2023-02-09 16:56

Quote from: lazzaro2023 on February 09, 2023, 05:15:48 pmQuote from:
GetMem on February 09, 2023, 01:23:17 pmHere you go:
https://forum.lazarus.freepascal.org/index.php/topic,44795.0.html
Ok!
Thanks!
But there is no possibility to monitor with a progressbar the upload
of the file ...
Did you download the attachment from Reply #2? I see a big juicy
progressbar on the main form.

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lazzaro2023 · 2023-02-26 14:22

Thank you for the report. I saw the progress bar in the foreground,
but it indicates the bytes read from the read stream buffer, not the
bytes actually uploaded to the server. Do you have a solution for this
on the client-side program?