QtonPi

Found it. For future viewers, on Debian-based systems the package one needs to install is waylandpp-dev. This will install all dev dependencies for Wayland.

Hi @jsulm, I'm not quite familiar with the build process since I'm quite new to this. I know this link is a Cross Compile tutorial for Raspberry pi 4B, what build configuration should I use instead for the Pi zero 2 w when calling configure? (with native build, considering the pi zero 2 is armv8, cortex-a53, and neon support)? thank you!

I encountered the same problem.

Wayland-scanner client-header < /home/lsqtpi/raspi/qtsrc/qt-everywhere-src-5.13.2/qtwayland/config.tests/wayland_scanner/scanner-test.xml > wayland-scanner-test-client-protocol.h
When I manually executed the above command from the console,
it displayed a message to install the following library.

sudo apt install libwayland-bin

@Marzonek

I already replied to your topic here

Non-static variable s caused incorrect accumulation of reversed characters. Overwriting value in the loop meant only the last reversed string was printed. Here is the corrected version reverses each string in the array in-place and prints the entire reversed array.

public class ReverseStringArray { public static void main(String[] args) { String[] array = {"ABCD", "EFGH", "IJKL", "MNOP"}; for (int i = 0; i < array.length / 2; i++) { String temp = array[i]; array[i] = array[array.length - 1 - i]; array[array.length - 1 - i] = temp; } for (String str : array) { System.out.print(str + " "); } } }

You can find the more details on this link where I shared.

Maybe completely unrelated, but I had the some similar problem, that my application is slowed down after a time. For me it was that I have debug messages with printf and with libfmt fmt::print and when I run my application without watching the output in ssh or same way in a terminal the application slowed down. I had to start my application with redirection of the outputs to /dev/null and the slow down went away. So for me worked the 2&>1 >/dev/null added in the at the startup shell script.

There was a wrong path set up in the environment config
feb6b6ab-206d-43be-9db9-ac3593a75135-image.png

Hi and welcome to devnet,

Please take the time to reduce your code to the minimal amount required to trigger your situation. Posting your whole project like that without any explanation about it does not really motivate to go through it.

That said, your back and forth logic looks wrong, you re-create new widgets all the time rather than rally switching between them. That could be one of the issue as you might be hogging your device memory and then it has to start using swap which is way slower than RAM.

On a side note, please use proper casing for your class names. Having class all lower case makes your code way harder understand and reason about. Python has style guidelines that you really should follow to make your life and the life of the people checking your code easier.

@zy2nii said in E: Unable to find a source package for qt4-x11:

plz I have the same problem

With Qt4?! Why you want to use Qt4?

Well, that's your main issue: you just installed the tools but none of the Qt development packages.

I also have the same error when using a re-terminal device. But I'm still able to deploy my app with no issues. You should be able to deploy your app on your rpi board with base64 missing. If your app fails to launch, ssh to your board and launch the app manually from CLI. You will get the error messages.

I compile app without
Window {
width: 640
height: 480
visible: true
}