Display image file from Web2Py in Py4Web

[Erich Meyer]

Hello

I have created an application test in Py4Web using scaffold. From a previous application from Web2Py (https://meyerich.pythonanywhere.com/Mathematik/default/snippet/15), I have saved the first image file image_data.b3e1102f4b87de27.646f64656b61656465725f342e706e67.png'  in the folder test/update. How can I access the image in test/index.html ?

Erich

[Jim Steil]

What have you tried?

Do you have a working example of it in web2py?

-Jim

[Erich Meyer]

see the link in my question

[Jim Steil]

I did - the link fails for me.

-Jim

[Erich Meyer]

and if you start with https://meyerich.pythonanywhere.com/Mathematik ?

[Alexander Beskopilny]

firefox
https://meyerich.pythonanywhere.com/Mathematik/default/snippet/15

Internal errorTicket issued: Mathematik/138.199.36.160.2022-09-15.13-33-58.80a9314c-c69e-4f0e-9d21-56e6217cbe6e

[Jim Steil]

If you take off the /default/snippet/15 then I get the app main page.

-Jim

[Erich Meyer]

in my case the link
https://meyerich.pythonanywhere.com/Mathematik

works, and then click on: Dodekaeder

Erich

[Jim Steil]

After going to the home page once, now the link above works.

But, that doesn't show me any code.  What have you tried in py4web?

-Jim

[Erich Meyer]

after the last update of my site, it no longer works completely; I can no longer log in; I get:
AttributeError: 'module' object has no attribute 'pbkdf2_hmac'.

[Jim Steil]

Just to confirm, it is running web2py, not py4web, correct?

-Jim

[Erich Meyer]

completely; I can no longer log in; I get:
AttributeError: 'module' object has no attribute 'pbkdf2_hmac'.

I don't know how to get to the previous version

Erich

[Erich Meyer]

jes, it is running web2py on pythonanywhre.com !

[Jim Steil]

I searched the web2py forum for pbkdf2_hmac and found this:

https://groups.google.com/g/web2py/c/s7vvulQo4nU/m/sgxK_Y5yBAAJ

There are others too.  I'd start there...

-Jim

[Erich Meyer]

Hello again!

In general:
when I create an application test using scaffold, I get the file test/index.html
--------------------------------------------
[[extend 'layout.html']]

<div class="section">
  <div class="vars">
      [[=message]]
  </div>
</div>
-----------------------------------------

What do I have to do to display an image file?

I think I should create a directory test/upload and save the image file in it. What do I have to add in  test/index.htm to display the image?

Greetings Erich

[Massimo]

Here https://github.com/web2py/py4web/blob/master/apps/_scaffold/common.py#L163 there is a download action.

You should be able to do

<img src="/yourapp/download/image_data.b3e1102f4b87de27.646f64656b61656465725f342e706e67.png"/>

or

<img src="[[=URL("download", filename_from_db)]]"/>

[Massimo]

Taking a second look. You filename is invalid. We are assuming here that a filename is generated by a py4web/web2py form upload and it is in the database table image field data. In this case the filename should start with "image.data." and not "image_data.". How did you generate that filename? Was it a cut and paste error somehow?

[Erich Meyer]

Hi Massimo,

the filename originally starts with "image.image_data."

Erich

[Massimo DiPierro]

then all good. right?

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[Erich Meyer]

Hi Massimo

What I did:
1. I create the app test with the help of scaffold
2. I save the image file in the static folder.
3. I add the index.html file:

-----------------------------
[[extend 'layout.html']]

<div class="section">
  <div class="vars">
      [[=message]]
  </div>

  <img src="image.image_data.b3e1102f4b87de27.646f64656b61656465725f342e706e67.png"/>  
</div>
----------------------------
4. I start the server and call:
127.0.0.1/test
!!!! the image is displayed !!!!
===============================
If I save the image file in the uploads folder and change the index.html to

------------------------------------------
[[extend 'layout.html']]

<div class="section">
  <div class="vars">
      [[=message]]
  </div>

  <img src="uploads/image.image_data.b3e1102f4b87de27.646f64656b61656465725f342e706e67.png"/>  
</div>
-----------------------------------------
then I get in the terminal:

"GET /test/static/uploads/image.image_data.b3e1102f4b87de27.646f64656b61656465725f342e706e67.png HTTP/1.1" - 404 447

only when I copy the uploads folder to the static folder, the image is displayed.

FACIT:
the uploads folder should not be created in scaffold parallel to the static folder.

Greetings Erich

[Massimo DiPierro]

did you try as i recommended before

  <img src="[[=URL('download','image.image_data.b3e1102f4b87de27.646f64656b61656465725f342e706e67.png')]]"/>

the download action is defined in common.py

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[Erich Meyer]

Hello Massimo

Your suggestion does not work, only a placeholder is shown. I have tried the two statements side by side:

  <img src="uploads/image.image_data.b3e1102f4b87de27.646f64656b61656465725f342e706e67.png"/>  

  <img src="[[=URL('download','image.image_data.b3e1102f4b87de27.646f64656b61656465725f342e706e67.png')]]"/>

the first shows the picture the second only the placeholder

Greetings Erich

[Massimo DiPierro]

i will post a complete example later tonight.

or if you post yours, i can help you debug the problem.

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[Massimo]

Here is an example that works for me.

https://www.dropbox.com/s/d7x5n7yrs6bkph6/demouploads.zip?dl=0

Compare the common.py, maybe yours is corrupted.

cd apps

unzip /path/to/demouploads.zip

start py4web

visit http://127.0.0.1:8000/demouploads/index

It will display any uploaded image.

[Erich Meyer]

Hello Massimo

Thank you very much for the example! It works for me and it shows me new things. (sessions are not needed)

Greetings Erich