QT报错：The inferior stopped because it received a signal from the Operating System.

QT运行报错
Signal received

The inferior stopped because it received a signal from the Operating System.

Signal name : SIGSEGV

Signal meaning : Segmentation fault

这个错误说明程序中有野指针

.h文件中

class QErrorMessage;//错误信息对话框QErrorMessage前置声明
class MyWidget : public QWidget
{Q_OBJECT
private:Ui::MyWidget *ui;QErrorMessage *errordlg;
}

.cpp文件

#include "mywidget.h"
#include "ui_mywidget.h"
#include <QDebug>
#include <QColorDialog>//颜色对话框
#include <QFileDialog> //文件对话框
#include <QFontDialog> //文字对话框
#include <QInputDialog>//输入对话框
#include <QMessageBox> //消息对话框
#include <QProgressDialog>//进度对话框
#include <QErrorMessage> //错误信息对话框MyWidget::MyWidget(QWidget *parent): QWidget(parent), ui(new Ui::MyWidget)
{ui->setupUi(this);
}MyWidget::~MyWidget()
{delete ui;
}void MyWidget::on_pushButton_2_clicked()//文件对话框
{void MyWidget::on_pushButton_7_clicked()//错误信息对话框{errordlg->setWindowTitle(tr("错误信息对话框"));errordlg->showMessage(tr("这里是出错信息！"));}
}

errordlg为野指针，使用new重新分配内存

     void MyWidget::on_pushButton_7_clicked()//错误信息对话框{errordlg = new QErrorMessage(this);//新建QErrorMessage对话框errordlg->setWindowTitle(tr("错误信息对话框"));errordlg->showMessage(tr("这里是出错信息！"));}

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