[Android/Delphi10.4]An app that sometimes freezes during image capture

[Fabian1648 1]

Hi,

 

I had an Android app developed in Delphi 10.3 that scanned barcodes via the smartphone camera and the ZXing library.

 

After switching to Delphi 10.4, the project was able to compile without any problem but the picture taking frequently crashes: It works sometimes and often the app freezes and you have to wait for a timeout for Android to ask if you don't want to close the application (same behaviour on Android 9, 10, 11).

 

There must have been changes in Delphi 10.4 that cause this problem.

 

Does anyone have an idea of such a change in Delphi 10.4 that could be the cause of this problem?

 

Thanks for your help

Edited November 6, 2022 by Fabian1648

[Fabian1648 1]

I give myself the answer to my question so that it can be useful to others 🙂

 

I found in the code that handles image capture 2 problems related to the changes made by Delphi 10.4:

 

1. A unit of the ZXing library has an error following the change of the indexing of the characters of a string (mystring[0] in Delphi10.3 becomes mystring[1] in Delphi10.4)

 

2. The management of the .free (a .free in Delphi 10.3 which must be removed because in Delphi 10.4, the release of a parent object automatically releases its children objects