Deploying Qt and QML Applications on Linux and Windows

Переносимость приложений, переносимость qt, Qt, Run Linux Application, QML, windows, deployment, cqtdeployer, Развертывание, deploy, linux

Introduction

In this article we will look at how to properly collect all qt dependencies for your application, which was collected dynamically.

For a start, a little theory.

Why is this needed?

There are several ways to build applications, the main ones are:

  • Static build. Static assembly involves the creation of a binary, which will be all the necessary links to it. In other words, all that is needed for his work will lie in it. This approach is suitable for small console applications that have few dependencies, otherwise the size of the final binary will be extremely large.

  • Dynamic build. It differs from static in that only the source code of your application will be in the binary (the size of the binary will be minimal), but when you run such an application it will need third-party libraries that were used when writing it.

Now a little description.

Console-QtDeployer is a simple utility similar to windeployqt and macdeployqt . But unlike analogs, it has a much more flexible interface (launch flags) and higher speed, besides it supports 2 windows and linux platforms, which means that now we can build dependencies for windows on Linux and vice versa.

Let's take an example.

For example, I wrote a simple qt application using qml - MyApp.

MyApp (main.cpp)

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main (int argc, char * argv [])
{
    QCoreApplication :: setAttribute (Qt :: AA_EnableHighDpiScaling);

    QGuiApplication app (argc, argv);

    QQmlApplicationEngine engine;
    engine.load (QUrl (QStringLiteral ("qrc: /main.qml")));
    if (engine.rootObjects (). isEmpty ())
        return -1;

    return app.exec ();
}

MyApp (main.qml)

import QtQuick 2.9
import QtQuick.Controls 2.2

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr ("Scroll")

    ScrollView {
        anchors.fill: parent

        ListView {
            width: parent.width
            model: 20
            delegate: ItemDelegate {
                text: "Item" + (index + 1)
                width: parent.width
            }
        }
    }
}

MyApp is linked dynamically, that is, it needs qt libraries to work. If we try to start the application, right after the build we get an error:

~/build-MyApp-Desktop_Qt_5_11_1_GCC_64bit4-Release $ ./MyApp ./MyApp: /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5: version `Qt_5 'not found (required by ./MyApp)
./MyApp: /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5: version `Qt_5 'not found (required by ./MyApp)
./MyApp: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.11 'not found (required by ./MyApp)
./MyApp: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5 'not found (required by ./MyApp)

From similar texts, we see that the application depends on the GUI qt libraries and qml libraries. Search and build all resources (libraries and plugins) will take a lot of time. To save time and effort, we will use the CQtDeployer utility (you can download it here ) or install in Snap Store

Download from the Snap Store

cqtdeployer -bin myApp -qmake /media/D/Qt/5.12.3/gcc_64/bin/qmake -qmlDir ./

After executing this command, you will receive a fully ready application for work with a ready launcher, which will set up all the necessary environments for your application to work on all machines running Linux.

Total

After running the QtDeployer Console, the contents of the folder with your application should look like this:

drwxr-xr-x 7 andrei andrei 4096 May 24 12:22 ./
drwxrwxr-x 3 andrei andrei 4096 May 24 12:22 ../
drwxr-xr-x 2 andrei andrei 4096 May 24 12:22 bin/
drwxr-xr-x 2 andrei andrei 4096 May 24 12:22 lib/
-rwx---rwx 1 andrei andrei  433 May 24 12:22 myApp.sh*
drwxr-xr-x 6 andrei andrei 4096 May 24 12:22 plugins/
drwxr-xr-x 5 andrei andrei 4096 May 24 12:22 qml/
drwxr-xr-x 2 andrei andrei 4096 May 24 12:22 translations/

cqtdeployer result

  • myApp.sh - your application launch script
  • bin - folder with your binary
  • lib - a folder with all the necessary dependencies of your application.
  • plugins - qt plugins needed for the application to work
  • qml - qml dependencies.
  • translations - standard qt translations.

Thus, you can prepare your application for packaging in a deb or snap package, after which you can begin to distribute it. Note that after running cqtdeployer, your application must be launched using the sh script, which will set up the necessary environment for your application.

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TT
June 13, 2019, 7:01 p.m.
Taimoor Tanweer

C++ - Test 001. The first program and data types

  • Result:66points,
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TT
June 13, 2019, 6:51 p.m.
Taimoor Tanweer

C++ - Test 002. Constants

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ВМ
June 13, 2019, 12:30 p.m.
Ваня Мороз

C++ - Test 001. The first program and data types

  • Result:100points,
  • Rating points10
Last comments
i
June 17, 2019, 6:10 a.m.
ingenfly

Только по осям xAxis2, уAxis2 значения начинаются с 0. Почему-то xAxis2 и xAxis не синхронизированы по данным. Ну и QCustomPlot последний.
June 16, 2019, 8:21 p.m.
Евгений Легоцкой

Добрый день. Ну точно также добавляете ту же самую информацию на ось xAxis2, только добавляете другое форматирование customPlot->xAxis2->setDateTimeFormat("hh:mm"); если я ...
EF
June 14, 2019, 1:56 p.m.
Egor Fomin

Спасибо за ваш ответ, у меня получилось реализовать это. Тем не менее появилась другая проблема, поэтому опять надеюсь на вашу помощь. Скажем, я уже выставил точки и они соеденены. Когда я нач...
d
June 13, 2019, 2:47 p.m.
damix

Можно классу, который описывает точку, добавить сигнал, который подавать (emit), когда точка перемещается (переопределить mouseMoveEvent или mouseReleaseEvent). Так вот эти сигналы у каждой из...
i
June 13, 2019, 2:09 p.m.
ingenfly

Здравствайте! Подскажите, пожалуйста: customPlot->xAxis2->setTickLabels(true); //Здесь включается отображение данных на оси xAxis2. а можно как-то продублировать информацию cus...
Now discuss on the forum
I
June 19, 2019, 1:41 p.m.
Intruder

Всем добрый день. При разборе XML файла наткнулся на тег вот такого плана: <TagName attribute1="value1" attribute2="value2" /> При попытке проверить на наличие такого элеме...
June 19, 2019, 12:55 p.m.
Михаиллл

Скажите пожалуйста, как его в таком случае перемещать и удалять?
June 18, 2019, 7:50 p.m.
Дмитрий

Большое спасибо! SDK заработал.К сожалению удалось продвинутся только на один шаг. При сборке чистого проекта NDK выдаёт следующие ошибки C:\Android\ndk-bundle/toolchains/arm-linux-andr...
June 18, 2019, 4:59 p.m.
Михаиллл

Добрый день.В этом учебнике представлен код INSTALLED_APPS = ( ... 'rest_framework', 'snippets.apps.SnippetsConfig',) На строчке 'snippets.apps.SnippetsConf...
June 18, 2019, 2:24 p.m.
Михаиллл

Спасибо, работает.Послушаю вашего совета.
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