Hi, I am encountering a problem that is far beyond my knowledge.
I am using the Bluetooth ESC/POS Printer Class
To print to a battery powered portable printer.
Everything works apparently fine, but if the printer is turned off, which can happen because it has an automatic timeout to save battery, or because the user decides to turn it off, then an error occurs and my program closes.
I have tried to find a solution by inserting "try cath..." in all the places where the "stream" (Private Stream As AsyncStreams) is used, but I have not been able to control the problem.
The message displayed by the log is:
So, what I need, at least, is to be able to control this error so that the program keeps working and does not close.
So I can keep retrying to connect to the printer until they reconnect it.
I wish you guys can help me, because I am totally lost with this topic.
Thank you very much.
I am using the Bluetooth ESC/POS Printer Class
To print to a battery powered portable printer.
Everything works apparently fine, but if the printer is turned off, which can happen because it has an automatic timeout to save battery, or because the user decides to turn it off, then an error occurs and my program closes.
I have tried to find a solution by inserting "try cath..." in all the places where the "stream" (Private Stream As AsyncStreams) is used, but I have not been able to control the problem.
The message displayed by the log is:
B4X:
"java.lang.NullPointerException: Attempt to write to field 'java.lang.Exception anywheresoftware.b4a.BA$SharedProcessBA.lastException' on a null object reference in method 'void anywheresoftware.b4a.BA.setLastException(java.lang.Exception)'
at anywheresoftware.b4a.BA.setLastException(BA.java:663)
at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AIN.run(AsyncStreams.java:292) at java.lang.Thread.run(Thread.java:1012)"So, what I need, at least, is to be able to control this error so that the program keeps working and does not close.
So I can keep retrying to connect to the printer until they reconnect it.
I wish you guys can help me, because I am totally lost with this topic.
Thank you very much.