B4J Question B4J non-ui app and bitmaps

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GraemeW

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I have a VPS-hosted B4J non-ui server app connected to a MySQL database and wish to create a series of xChart images from the db for use with 24/7 YouTube live (via FFmpeg).

However I have found that the B4J non-ui app cannot produce bitmaps from xChart snapshots. Am I missing something? If true, is another approach possible, such as B4J -> Python -> FFmpeg?
 
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aeric

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Have you checked this tutorial?

[server] Using UI app to create a QR code as part of a server solution

Online example: https://b4x.com:51041/qrgenerator/index.html A question was posted about generation of QR codes in a server solution (https://www.b4x.com/android/forum/threads/solved-jserver-html-js.123679/). I thought that I can quickly create a nice and simple...
www.b4x.com
 
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GraemeW

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Thanks for that. I'll check it out.

However my observation about non-ui and bitmaps may not be correct - things seem to be ok if I change bitmap to B4XBitmap.
 
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aeric

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I am not familiar with FFMpeg but I think it is working with jShell.
 
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aeric

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Maybe you can use these libraries too:

non-ui - resize image in byte array without javafx

I get a image as byte on my server, i want to create a smaller image of it to use it as thumbnail. I want to avoid having to use javafx. Is that possible?
www.b4x.com

[Source code] ImageScaler

Introduction: I don't know if there is any library exist to resize image in B4J non-UI app. I thought such library will be useful to process images for web server in building REST API for e-commerce or e-learning web apps. I found an example on web and chose the third method, from an old project...
www.b4x.com
 
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GraemeW

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aeric said:
I am not familiar with FFMpeg but I think it is working with jShell.
Click to expand...
Yes the tutorial uses jShell to get a ui app on the server to produce the graphic, using text output from the non-ui app. I suspect this might get very complicated for the production of chart images, which is why I was thinking of using the non-ui server to output text arrays as input to python for graph image production.

I'll also check out your other suggestions in case plan A does not actually work - thank you .
 
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aeric

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You can also use Chart.js

EndsMeet ChartJs HTMX

Update Chart.js using HTMX and B4J GitHub: https://github.com/pyhoon/EndsMeet-Htmx-ChartJs-B4J Code modified from DeepSeek's answer.
www.b4x.com
 
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GraemeW

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Thanks again . A dynamic graphic website with data from my B4J server is another approach - essentially a real-time web dashboard. Interesting, I'll think a bit more about what I'm trying to solve..
 
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