About Integration of a external C++ code in MIT App inventor

[Taifun]

this is unfortunately not possible

you could convert the C++ code into JavaScript and use the Webviewer component and its WebViewString block, see this example

Javascript, not working

(edit finished, linked to from FAQs on Javascript and Webview. - ABG...) WebView Javascript Processor for App Inventor This tutorial was originally written by Rich Interdonato, MIT Master Trainer and posted to https://appinventor.mit.edu/explore/ai2/webview-javascript This revision uses the newer WebViewer.WebViewStringChange event and new (November 2020) Media file addressing for the webViewer component for simplicity. - ABG App Inventor allows users to write powerful programs using blocks i…

or you could convert it into Java and write your own Extension

more information about how to create an extension see the App Inventor Extensions document
however that will be more advanced and will require some Java skills...

Taifun

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Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.