Question

我需要将Qt遗留代码从4.7转换为5.8 ，我在Qt Creator 4.2.1 Clang 7.0（Apple）64bit中有编译错误。

查看.cpp文件

#include "mpiChartCurve.h"
#include <qwt_plot_curve.h>


mpiChartCurve::mpiChartCurve(QwtPlot *chart_):
    m_chart(chart_),
    m_curve(new QwtPlotCurve())
{
}

mpiChartCurve::~mpiChartCurve()
{
    // be default qwt will delete the curve when it is destroyed
    // only delete the curve when detach is called
}

void mpiChartCurve::detach()
{
    m_curve->detach();

    // hack for now?  qwt doesn't seem to redraw properly until a curve is attached after a detachment, so attach dummy
    QVector<double> x, y;
    m_curve->setRawData(x.constData(), y.constData(), 0); // JDL convert Qt4 to Qt5  BROKE
    m_curve->attach(m_chart);
    m_curve->detach();

    delete m_curve;
    m_curve = 0;
}


void mpiChartCurve::attach()
{
    if (!m_curve)
        return;

    m_curve->setRawData(m_xData.constData(),m_yData.constData(), count()); // JDL convert Qt4 to Qt5  BROKE
    m_curve->attach(m_chart);
}

.cpp中的2个错误

../ src / usercontrols / mpiChartCurve.cpp:23:14：错误：没有名为＆＃39; setRawData＆＃39;在＆＃39; QwtPlotCurve＆＃39; m_curve-＆gt; setRawData（x.constData（），y.constData（），0）; // JDL将Qt4转换为Qt5 BROKE ~~~~~~~ ^

../ src / usercontrols / mpiChartCurve.cpp:37:14：错误：没有名为＆＃39; setRawData＆＃39;在＆＃39; QwtPlotCurve＆＃39; m_curve-＆gt; setRawData（m_xData.constData（），m_yData.constData（），count（））; // JDL将Qt4转换为Qt5 BROKE ~~~~~~~ ^

生成2个错误 make：*** [mpiChartCurve.o]错误1 21:12:40：过程＆＃34; / usr / bin / make＆＃34;退出代码2。构建/部署项目mypersonalindex时出错（工具包：Desktop Qt 5.8.0 clang 64bit）执行步骤＆＃34;制作＆＃34;

Qt5文档提到了 setRawData

QByteArray &    setRawData(const char *data, uint size)

我在QByteArray的文档中注意到了这条评论

（废弃）运算符const char *（）const

我的C ++技能非常有限，您是否看到任何可以将其从Qt4转换为Qt5的小调整。 ......那么替代品是什么？

Answer 1

setRawData不是QwtPlotCurve的成员函数。它是QByteArray的成员函数，它只接受2个参数。将setRawData更改为setRawSamples，setRawSamples是QwtPlotCurve的成员函数，并接受您正在寻找的三个参数。

修正版

#include "mpiChartCurve.h"
#include <qwt_plot_curve.h>


mpiChartCurve::mpiChartCurve(QwtPlot *chart_):
    m_chart(chart_),
    m_curve(new QwtPlotCurve())
{
}

mpiChartCurve::~mpiChartCurve()
{
    // be default qwt will delete the curve when it is destroyed
    // only delete the curve when detach is called
}

void mpiChartCurve::detach()
{
    m_curve->detach();

    // hack for now?  qwt doesn't seem to redraw properly until a curve is attached after a detachment, so attach dummy
    QVector<double> x, y;
    m_curve->setRawSamples(x.constData(), y.constData(), 0); // JDL convert Qt4 to Qt5  BROKE
    m_curve->attach(m_chart);
    m_curve->detach();

    delete m_curve;
    m_curve = 0;
}


    void mpiChartCurve::attach()
{
    if (!m_curve)
        return;

    m_curve->setRawSamples(m_xData.constData(),m_yData.constData(), count()); // JDL convert Qt4 to Qt5  BROKE
    m_curve->attach(m_chart);
}

没有名为＆＃39; setRawData＆＃39;在＆＃39; QwtPlotCurve＆＃39; - 将Qt 4.7转换为Qt 5.8

1 个答案: