Question

我有两个类：HoodPlanner和DrawRoad。这两个类都继承自QWidget和UI，因此我可以访问这两个类中的所有UI元素。

这是两个类的剪辑：

HoodPlanner：

#ifndef HOODPLANNER_H
#define HOODPLANNER_H

#include <ui_hoodplanner.h>
#include "drawroad.h"
#include <QtWidgets>

class HoodPlanner : public QWidget, private Ui::HoodPlanner
{
  Q_OBJECT
  private:
    // (...)

  public:
    explicit HoodPlanner(QWidget * = 0);
    // (...)

  private slots:
    // (...)
};

#endif // HOODPLANNER_H

DrawRoad：

#ifndef DRAWROAD_H
#define DRAWROAD_H

#include <ui_hoodplanner.h>
#include <QtWidgets>

class DrawRoad : public QWidget, private Ui::HoodPlanner
{
  Q_OBJECT
  private:
    // (...)

  public:
    explicit DrawRoad(QWidget *parent = 0);

  public slots:
    void drawSC4Street();
};

#endif // DRAWROAD_H

在HoodPlanner中，每当itemSelection在table_ts2中发生更改时，我都会发出一个连接。我将插槽存储在DrawRoad中，但是在第三个位置插入DrawRoad对象的引用会带来错误。

HoodPlanner::HoodPlanner(QWidget *parent) : QWidget(parent)
{
  setupUi(this);
  // (...)
  DrawRoad *drawRoad = new DrawRoad;
  connect(table_ts2, SIGNAL(itemSelectionChanged()), &drawRoad, SLOT(drawSC4Street()));
}

从DrawRoad.cpp剪掉：

#include "drawroad.h"

DrawRoad::DrawRoad(QWidget *parent) : QWidget(parent)
{
}

void DrawRoad::drawSC4Street()
{
  if(!table_ts2->selectionModel()->hasSelection()) return;
  // (...)
}

每当我运行应用程序时都会出现以下错误：

hoodplanner.cpp:12: Fehler: no matching function for call to 'HoodPlanner::connect(QTableWidget*&, const char [24], DrawRoad**, const char [17])'
mingw492_32\include\QtCore\qobject.h:213: Fehler: no type named 'Object' in 'struct QtPrivate::FunctionPointer<const char*>'

（和很多笔记）

错误根本没有帮助我，我在几个主题中搜索了一个解决方案，但没有一个问题。

Answer 1

你试过吗

HoodPlanner::HoodPlanner(QWidget *parent) : QWidget(parent)
{
  setupUi(this);
  // (...)
  DrawRoad *drawRoad = new DrawRoad;
  connect(table_ts2, SIGNAL(itemSelectionChanged()), drawRoad, SLOT(drawSC4Street()));
}

你将declrared drawRoad作为指针：

DrawRoad *drawRoad = new DrawRoad;

然后将其地址传递给connect（）和＆amp; drawRoad。在这种情况下，您将指针传递给指针地址。尝试不使用&

Qt连接两个类不工作

1 个答案: