how do you use RegisterFileLocation procedure from fpWebFile.pp?
lazarus / 38-Networking and Web Programming

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Awesome Programmer · 2013-07-22 19:42

After working through my threaded http webserver program, now I am
running into a different problem. I want to be able to point the http
server application to a virtual folder which points an actual path on
the hardrive.

From what I read RegisterFileLocation procedure should let you do
exactly that. So, after putting my code as follows, I try to access my
webpage, but I can't see the image that supposed to display in the
browser.

RegisterFileLocation('files','/home/reltek/fcl-web/threaded_http');

I try to access the image as follows;

http://192.168.1.117:8080/files/myscree.jpg

All it displays is a broken icon to indicate broken image link.

So, whats my problem? thanks for your help.

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Leledumbo · 2013-07-22 21:41

Probably wrong mimetype, which defaults to application/octet-stream.
Set MimeTypesFile to path to a file containing mimetypes definition at
the start of your program (or at unit initialization).

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Awesome Programmer · 2013-07-23 12:39

How is about the following code? Is that sufficient?

Code: [Select]Procedure TForm1.Create;
begin
     RegisterFileLocation('files','/home/reltek/fcl-
web/threaded_http');
     MimeTypesFile := '/etc/mime.types';
end;

Here is the HTML page Response from the HTTP server.

Code: [Select]procedure TForm1.DoHandleRequest(Sender: TObject;  var
ARequest: TFPHTTPConnectionRequest; var AResponse:
TFPHTTPConnectionResponse);
begin
         AResponse.Content:='<html><head><title>Oh Venus, Oh Venus, Oh
Venus</title></head><body>Testing'+ARequest.URL+
         '<br><img src="/files/myscreen.jpg"></body></html>';
end;
I still don't see the image but I do see the text.

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Leledumbo · 2013-07-23 15:41

And what happens if you view source and click the image link directly?

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Awesome Programmer · 2013-07-23 15:50

Here is what I see. Take a look at my attached image. I am using
FireFox.

As you can see, I can see everything except the image.

UPDATE: just as a test, I hot linked an image directly from our
company's website webserver and it worked. Only when I say,Code:
[Select] /files/myscreen.jpg orCode: [Select]
http://192.168.1.117:8080/files/myscreen.jpg from Lazarus' HTTP
webserver it doesn't work. So, what is the difference here?

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Leledumbo · 2013-07-23 21:29

QuoteI hot linked an image directly from our company's website
webserverDo you mean it points to image in an external server? It
would be totally different since the web browser will query the
external server instead of your application.

Try the attached project (don't forget to adjust the path in .lpr),
and ensure you get the same result (HTTP 200 OK) in your browser's
developer tools (screenshot attached). At the worst, your browser
should download the image instead of displaying it.

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Awesome Programmer · 2013-07-24 13:39

Thanks for the sample project. I got it debugging, but when I request
the page from your sample http server I get the following errors. See
the attached image.

Am I doing this right?

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Leledumbo · 2013-07-24 17:01

Ah, sorry. I forgot to mention the URL: http://<your
host>:8080/index/main

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Awesome Programmer · 2013-07-24 17:58

I am almost happy. I ran your program and send a request out just as
you said and I got an error on the server. See the image.

However, when I clicked on the "Continue" button and the error box
popped up again, but this time I noticed that HTTP server did send the
HTML page and the image. Your image was displayed on the browser.

Any idea?

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Leledumbo · 2013-07-25 05:05

Yes, the exception is intended and is part of fpweb flow. Don't worry,
it's internally handled and your actual code won't have any exception,
it's the debugger that currently still catches exception regardless
it's handled or not.

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Awesome Programmer · 2013-07-25 14:18

yea. I just ran your compiled program by itself outside of Lazarus IDE
and it ran without any error messages. Plus, it served the webpage
with your image.

Now, I have a working test program to learn and work from. Thanks. I
still can't get my GUI Application with http server to display an
image but it does respond with html texts.

So, What is the difference between your test program and mine? I see
that your program is a http application that uses modules to respond
to client request(s). My program is an GUI Application, which runs
HTTP server from within an inherited Thread Class and I am not using
modules to respond to client request.

Correct me if I am wrong.

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Leledumbo · 2013-07-25 15:05

QuoteMy program is an GUI Application, which runs HTTP server from
within an inherited Thread Class and I am not using modules to respond
to client request.In that case, I have no idea. Both utilizes the same
style of program initialization (Application.Initialize followed by
Application.Run) though http server app is not a LCL app.
Application.Run will run forever (until terminated actually) thus you
can't really execute Run method from 2 different Application instance.

RegisterFileLocation is designed to work with fpweb modules. Just open
the code and see yourself what the code really does.