f
fryn3Aug. 22, 2018, 4:10 a.m.

Собрать static QWT application

Qt, static, Qwt

Установил статический QT по видео . Установил QWT по видео .
В файле C:\qwt-6.1.3\qwtconfig.pri закоменчена строка:

######################################################################
# Build the static/shared libraries.
# If QwtDll is enabled, a shared library is built, otherwise
# it will be a static library.
######################################################################

#QWT_CONFIG           += QwtDll

Создаю маленький проект(код ниже). Динамически все собирается и запускается. Статически собирается, но вылетает ошибка:

QWidget: Must construct a QApplication before a QWidget

Ошибка при запуске статического приложения


Путь к статик Qt: C:\Qt\Static5111\5.11.1_Static Путь к Qwt: C:\qwt-6.1.3 Проект: qwtTemp.pro

QT       += core gui widgets

TARGET = qwtTemp
TEMPLATE = app

DEFINES += QT_DEPRECATED_WARNINGS


CONFIG += c++11

SOURCES += \
        main.cpp \
        widget.cpp

HEADERS += \
        widget.h


# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

CONFIG += qwt

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <qwt_plot.h>

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();

    QwtPlot *p;
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    p = new QwtPlot();
}

Widget::~Widget()
{
    delete p;
}

main.cpp

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    w.p->show();
    return a.exec();
}
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6
Evgenii Legotckoi
  • Aug. 27, 2018, 3:52 a.m.

Попробуйте так исправить

#include <QApplication>
#include "widget.h"

// Won't ever be a dangling pointer.
QPointer<Widget> w;

int main(int argc, char ** argv)
{
  QApplication app(argc, argv);
  Widget w_("Hello, world!");
  w.reset(&w_);
  w->show();
  return app.exec();
}
    f
    • Aug. 27, 2018, 4:03 a.m.
    • (edited)

    удалено

      f
      • Aug. 27, 2018, 4:03 a.m.

      у QPointer нет метода reset.

        Evgenii Legotckoi
        • Aug. 27, 2018, 4:10 a.m.

        Может тогда QScopedPointer?

          f
          • Aug. 27, 2018, 4:12 a.m.
          #include <QApplication>
          #include <QPointer>
          #include "widget.h"
          
          QPointer<Widget> w;
          
          int main(int argc, char *argv[])
          {
              QApplication a(argc, argv);
              Widget w_;
              w = (&w_);
              w.data()->show();
              return a.exec();
          }

          // так запустил, ничего не изменилось
            f
            • Aug. 27, 2018, 4:15 a.m.
            #include <QApplication>
            #include <QPointer>
            #include "widget.h"
            
            QScopedPointer<Widget> w;
            
            int main(int argc, char *argv[])
            {
                QApplication a(argc, argv);
                Widget w_;
                w.reset(&w_);
                w.data()->show();
                return a.exec();
            }
            // запустил так, тоже самое.
            // и везде предупреждение такое:
            // C:\Users\User_ggsk_1\Documents\qwtTemp\main.cpp:5: предупреждение: no previous extern declaration for non-static variable 'w'

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