How to resolve this error ASSERT: “!”No style available without QApplication!“” in file kernel\qapplication.cpp, line 1054?
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When I start application to display a chart it presents me with this error:
QML debugging is enabled. Only use this in a safe environment. ASSERT: "!"No style available without QApplication!"" in file kernel\qapplication.cpp, line 1054 ASSERT: "!"No style available without QApplication!"" in file kernel\qapplication.cpp, line 1054
/file.pro
QT += quick CONFIG += c++11 # The following define makes your compiler emit warnings if you use # any feature of Qt which as been marked deprecated (the exact warnings # depend on your compiler). Please consult the documentation of the # deprecated API in order to know how to port your code away from it. DEFINES += QT_DEPRECATED_WARNINGS # You can also make your code fail to compile if you use deprecated APIs. # In order to do so, uncomment the following line. # You can also select to disable deprecated APIs only up to a certain version of Qt. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 SOURCES += \ main.cpp RESOURCES += qml.qrc # Additional import path used to resolve QML modules in Qt Creator's code model QML_IMPORT_PATH = # Additional import path used to resolve QML modules just for Qt Quick Designer QML_DESIGNER_IMPORT_PATH = # Default rules for deployment. qnx: target.path = /tmp/$${TARGET}/bin else: unix:!android: target.path = /opt/$${TARGET}/bin !isEmpty(target.path): INSTALLS += target/file.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(); }/file.qml
import QtQuick 2.9 import QtQuick.Window 2.2 import QtCharts 2.0 import QtQuick 2.0 Window { visible: true width: 640 height: 480 title: qsTr("Hello World") ChartView { width: 400 height: 300 theme: ChartView.ChartThemeBrownSand antialiasing: true PieSeries { id: pieSeries PieSlice { label: "eaten"; value: 94.9 } PieSlice { label: "not yet eaten"; value: 5.1 } } } } -
When I start application to display a chart it presents me with this error:
QML debugging is enabled. Only use this in a safe environment. ASSERT: "!"No style available without QApplication!"" in file kernel\qapplication.cpp, line 1054 ASSERT: "!"No style available without QApplication!"" in file kernel\qapplication.cpp, line 1054
/file.pro
QT += quick CONFIG += c++11 # The following define makes your compiler emit warnings if you use # any feature of Qt which as been marked deprecated (the exact warnings # depend on your compiler). Please consult the documentation of the # deprecated API in order to know how to port your code away from it. DEFINES += QT_DEPRECATED_WARNINGS # You can also make your code fail to compile if you use deprecated APIs. # In order to do so, uncomment the following line. # You can also select to disable deprecated APIs only up to a certain version of Qt. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 SOURCES += \ main.cpp RESOURCES += qml.qrc # Additional import path used to resolve QML modules in Qt Creator's code model QML_IMPORT_PATH = # Additional import path used to resolve QML modules just for Qt Quick Designer QML_DESIGNER_IMPORT_PATH = # Default rules for deployment. qnx: target.path = /tmp/$${TARGET}/bin else: unix:!android: target.path = /opt/$${TARGET}/bin !isEmpty(target.path): INSTALLS += target/file.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(); }/file.qml
import QtQuick 2.9 import QtQuick.Window 2.2 import QtCharts 2.0 import QtQuick 2.0 Window { visible: true width: 640 height: 480 title: qsTr("Hello World") ChartView { width: 400 height: 300 theme: ChartView.ChartThemeBrownSand antialiasing: true PieSeries { id: pieSeries PieSlice { label: "eaten"; value: 94.9 } PieSlice { label: "not yet eaten"; value: 5.1 } } } }@Janilson-Duarte
as the error says:
Instantiate a QApplication instead of a QGuiApplication in your main() -
When I start application to display a chart it presents me with this error:
QML debugging is enabled. Only use this in a safe environment. ASSERT: "!"No style available without QApplication!"" in file kernel\qapplication.cpp, line 1054 ASSERT: "!"No style available without QApplication!"" in file kernel\qapplication.cpp, line 1054
/file.pro
QT += quick CONFIG += c++11 # The following define makes your compiler emit warnings if you use # any feature of Qt which as been marked deprecated (the exact warnings # depend on your compiler). Please consult the documentation of the # deprecated API in order to know how to port your code away from it. DEFINES += QT_DEPRECATED_WARNINGS # You can also make your code fail to compile if you use deprecated APIs. # In order to do so, uncomment the following line. # You can also select to disable deprecated APIs only up to a certain version of Qt. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 SOURCES += \ main.cpp RESOURCES += qml.qrc # Additional import path used to resolve QML modules in Qt Creator's code model QML_IMPORT_PATH = # Additional import path used to resolve QML modules just for Qt Quick Designer QML_DESIGNER_IMPORT_PATH = # Default rules for deployment. qnx: target.path = /tmp/$${TARGET}/bin else: unix:!android: target.path = /opt/$${TARGET}/bin !isEmpty(target.path): INSTALLS += target/file.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(); }/file.qml
import QtQuick 2.9 import QtQuick.Window 2.2 import QtCharts 2.0 import QtQuick 2.0 Window { visible: true width: 640 height: 480 title: qsTr("Hello World") ChartView { width: 400 height: 300 theme: ChartView.ChartThemeBrownSand antialiasing: true PieSeries { id: pieSeries PieSlice { label: "eaten"; value: 94.9 } PieSlice { label: "not yet eaten"; value: 5.1 } } } }@Janilson-Duarte
@raven-worx is right, you have to replace GuiApplication with QApplication, the reason for this is your use of QChartstake a look at the docu
Note: Projects created with Qt Creator's Qt Quick Application wizard are based on the Qt Quick 2 template that uses QGuiApplication by default. All such QGuiApplication instances in the project must be replaced with QApplication as the module depends on Qt's Graphics View Framework for rendering.
Because QCharts is it's own modul, you'll prob also have to add
QT += chartsto your project file. -
Thank you very much guys, it worked.
