How to use SVG
-
One question, I have done everything to the best of my abilities but I still get the error:
"undefined reference to _imp_ZN10QSvgWidgetC1EP7QWidget"
"undefined reference to _imp_ZN10QSvgWidget4loadERK7QString"Here is my code:
qmake .pro:
QT += core gui QT += sql greaterThan(QT_MAJOR_VERSION, 4): QT += widgets svg CONFIG += c++11 # You can make your code fail to compile if it uses deprecated APIs. # In order to do so, uncomment the following line. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 SOURCES += \ main.cpp \ mainwindow.cpp HEADERS += \ mainwindow.h FORMS += \ mainwindow.ui # Default rules for deployment. qnx: target.path = /tmp/$${TARGET}/bin else: unix:!android: target.path = /opt/$${TARGET}/bin !isEmpty(target.path): INSTALLS += target RESOURCES += \ Resources.qrcmainwindow.cpp:
#include "mainwindow.h" #include "ui_mainwindow.h" #include <QtSvgWidgets/QSvgWidget> #include <QtSvg> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); QSvgWidget* svg = new QSvgWidget(this); svg->load(QString(":/images/images/Dollar.svg")); ui->verticalLayout_3->addWidget(svg); } MainWindow::~MainWindow() { delete ui; }mainwindow.h:
#ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> QT_BEGIN_NAMESPACE namespace Ui { class MainWindow; } QT_END_NAMESPACE class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget *parent = nullptr); ~MainWindow(); private: Ui::MainWindow *ui; }; #endifmain.cpp:
#include "mainwindow.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); return a.exec(); }(PS: I tried to add [include<QtSvgWidget>] but it doesn't exist by it's own. It is rather inside the "QtSvgWidgtes/QtSvgWidget")
@Saviz Where is "QT += svg" in your pro file?
-
-
Which version of Qt are you currently using ?
Interested in AI ? www.idiap.ch
Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct -
-
Qt version 4.14.2 (That is what it says in the "About")
I don't understand something, I just recently downloaded Qt. When I downloaded Qt I selected the Qt 6 version but now as you told me to look at the version it says 4.14,2. What is going on I am very confused. Did I make a mistake in the download process?
-
No that's the Qt Creator version. There's no Qt 4.14.
You have to take a look at the kit you are using.
Interested in AI ? www.idiap.ch
Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct -
No that's the Qt Creator version. There's no Qt 4.14.
You have to take a look at the kit you are using.
-
It was introduced from 4.1.
https://doc.qt.io/qt-5/qsvgwidget.html
QT += core gui widgets svg <=== you need widgets as well for qsvgwidgetIf you simply need a QPixmap from a svg source for other widgets, use QSvgRenderer to paint one.
-
Hi
it should work unless really old Qt.Could you try in build menu to use Clean all, run qmake and then press the run ?
-
I tried doing what you suggested. Unfortunately it didn't work.
I first cleaned the project and then ran qmake but I still get the same errors.
Maybe I am doing something else wrong? (Like not including something?) -
Drop the C++ CONFIG, you do not need that currently.
You should also consider updating to the latest Qt 6.1.
-
@Saviz CONFIG += c++17 you also need 17 for Qt 6.
Show this line of your Makefile:
LIBS = $(SUBLIBS)
it should have -lQt5Svg -
@Saviz Another possibility is svg is not installed. Run MaintenaceTool to add it. I just installed Qt 6.1.2 in which svg is included. If you can find it in the Qt lib dir, check the path settings for Qt.
-
@JoeCFD said in How to use SVG:
MaintenaceTool
If I want to only install the SVG components, then what component do I have to select in the MaintenaceTool to install?
Hi
It should be included in any of the installer options. Its not a standalone option.
I don't have Qt6 to test with.
So the project I linked cannot run under Qt6 ?
complains about svg ?
Try install the Qt 6.1.2 as @JoeCFD suggests
-
-
I will give it a try. But my speed is not the best. It may take a while to download the new version. But I will report back how it went. Thank you all for your help
Hi
Else a sure bet is installing Qt5.15.
While v6 does offer new things
https://wiki.qt.io/New_Features_in_Qt_6.0
Its mostly if you are using QML and it still has lots of features missing planned
for some later releases. -
Hi
Else a sure bet is installing Qt5.15.
While v6 does offer new things
https://wiki.qt.io/New_Features_in_Qt_6.0
Its mostly if you are using QML and it still has lots of features missing planned
for some later releases. -
Okay, I will try it. By the way I have one last question. Why isn't there a widget for SVG in QT Designer by default?
- Why isn't there a widget for SVG in QT Designer by default?
Too much work I would guess. To allow a Widget to be used in design time, a plugin must be made and maintained across many Designers.
And QSvgWidget doesn't have any properties to set at Design time. (besides the svg file) so I gues sit was
not worth the effort.You can use the Producer Promote feature to allow a Qwidget as a place holder in Designer and then app is run its
the SVG one. -
- Why isn't there a widget for SVG in QT Designer by default?
Too much work I would guess. To allow a Widget to be used in design time, a plugin must be made and maintained across many Designers.
And QSvgWidget doesn't have any properties to set at Design time. (besides the svg file) so I gues sit was
not worth the effort.You can use the Producer Promote feature to allow a Qwidget as a place holder in Designer and then app is run its
the SVG one.
