only one QPushButton with QWidget works

K-Str

Hello to all,
I got a lot of very helpfull information on thos forum. Thanks to all.
Now I have a problem creating a widget.
Here my settings:

lWidget size = 480x320
I removed the following items: QMenuBar, QToolBar, QStatusBar
I still have : QMainWindow and QWidget
Then I created two PushButtons Shutdown and MotorOnOf

When I execute the programm it catches only the PushButton Shutdown
When I have a button on this position on the raspbian GUI I can get it.
What could be the problem?
Here the program files:
MainWindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QPushButton>
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_ShutdownButton_clicked()
{
    qDebug() << "Shutown now";
}

void MainWindow::on_MotorOnOffButton_clicked()
{
    qDebug() << "engine on";
}

MainWindow.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:

    void on_ShutdownButton_clicked();

    void on_MotorOnOffButton_clicked();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

MainWindow.ui:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>480</width>
    <height>320</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralWidget">
   <widget class="QPushButton" name="MotorOnOffButton">
    <property name="geometry">
     <rect>
      <x>360</x>
      <y>270</y>
      <width>89</width>
      <height>25</height>
     </rect>
    </property>
    <property name="text">
     <string>Engine off</string>
    </property>
   </widget>
   <widget class="QPushButton" name="ShutdownButton">
    <property name="geometry">
     <rect>
      <x>70</x>
      <y>230</y>
      <width>89</width>
      <height>25</height>
     </rect>
    </property>
    <property name="text">
     <string>Shutdown</string>
    </property>
   </widget>
  </widget>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>

mrjj

Hi
Without code, its really hard to guess at anything.

You can paste the code here. just use the code tag from the editor.

K-Str

@mrjj yes!
I inserted the code now. See post above.

SGaist

Hi,

Do you have any runtime warning about slots not connected ?

K-Str

@SGaist thanks for your answer.
I'm in the hospital and will answer as soon as I'm at home.
Is this warning visible running it using the Qt debugger?

SGaist

There's no Qt debugger as there is no Qt compiler.

As for the runtime warning, they are printed on stdout.

K-Str

@SGaist
yes there are some warnings:

16:15:13: Checking available ports...
16:15:13: Found 101 free ports.
16:15:13: Starting gdbserver --multi :10000...
16:15:13: Debugging starts
SSH is enabled and the default password for the 'pi' user has not been changed.
This is a security risk - please login as the 'pi' user and type 'passwd' to set a new password.

1689
Listening on port 10000
Remote debugging from host 192.168.180.65
Process /opt/Teleskop/bin/Teleskop created; pid = 1707
Could not load shared library symbols for 3 libraries, e.g. /usr/local/qt5pi/lib/libQt5Widgets.so.5.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?Could not load shared library symbols for 3 libraries, e.g. /usr/local/qt5pi/plugins/platforms/libqeglfs.so.Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
Could not load shared library symbols for /usr/local/qt5pi/plugins/egldeviceintegrations/libqeglfs-brcm-integration.so.Do you need "set solib-search-path" or "set sysroot"?
Could not load shared library symbols for /usr/local/qt5pi/plugins/imageformats/libqgif.so.Do you need "set solib-search-path" or "set sysroot"?
Could not load shared library symbols for /usr/local/qt5pi/plugins/imageformats/libqico.so.Do you need "set solib-search-path" or "set sysroot"?
Could not load shared library symbols for /usr/local/qt5pi/plugins/imageformats/libqjpeg.so.Do you need "set solib-search-path" or "set sysroot"?
Unable to query physical screen size, defaulting to 100 dpi.To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).

Maybe there is a failure.

SGaist

Are you running this application on a remote device ?

If so, you should rather make it run first on your desktop machine and then run on the device.

K-Str

@SGaist
I added the Kit for Desktop Qt 5.12.3 GCC 64 Bit-
It doesn't work. This is the error:

17:06:03: Running steps for project Teleskop...
17:06:03: Configuration unchanged, skipping qmake step.
17:06:03: Starting: "/usr/bin/make" -j4
g++ -Wl,-rpath,/home/kurt/Qt/5.12.3/gcc_64/lib -o Teleskop main.o mainwindow.o moc_mainwindow.o   -L/home/kurt/Qt/5.12.3/gcc_64/lib -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread   
/usr/bin/ld: cannot find -lGL
Makefile:263: recipe for target 'Teleskop' failed
collect2: error: ld returned 1 exit status
make: *** [Teleskop] Error 1
17:06:03: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project Teleskop (kit: Desktop Qt 5.12.3 GCC 64bit)
When executing step "Make"
17:06:03: Elapsed time: 00:00.

I think I have to add the module GL. Is this correct? But where can I find this?

SGaist

The missing GL error has been asked about many times already, you have to install the OpenGL development package from your distribution.

K-Str

@SGaist ,
thanks for this hint I will add the kit for Ubuntu again tomorrow.

K-Str

@SGaist
Yes I try to run it remotely on a raspberry.
Now I have installed the kit for the host PC. Yes it works perfect on the host.
What can I do to make it working on a remote raspberry? I use /usr/bin/gdb-multiarch for debugging remotely on the raspberry. Is this ok

SGaist

Do you mean that your application is working fine on your desktop and still not on your target ?

K-Str

@SGaist yes
if the target is the linux host (ubuntu desktop) the application works fine.
If the target is the raspberry it does not work.
What about this info:

Could not load shared library symbols for 3 libraries, e.g. /usr/local/qt5pi/lib/libQt5Widgets.so.5.

Is there something missing?
Maybe somebody knows more about this problem.

SGaist

What do you get if you call ldd on that file ?

K-Str

@SGaist , where must I run ldd?
On the linux host PC or on the raspberry?

K-Str

@SGaist ;
I will check it tomorrow

SGaist

@k-str said in only one QPushButton with QWidget works:

Sorry, I made a mistake

What do you mean with that ?

K-Str

@SGaist ,
yesterday I had some trouble with my computer network and I couldn't write a post correcttly.
Here the output of lcc:

Do yoe need the output also when I run lcc on the on the Linux host?

SGaist

Looks good. What is the exact error message you're getting when starting your application ?

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Unsolved only one QPushButton with QWidget works