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分段錯誤錯誤(信號名稱:SIGSEGV)的原因是什么,如何找到/修復它?

[英]What is the cause of a segmentation fault error (signal name: SIGSEGV), and how would I find/fix it?

我一直在開發Qt Creator應用程序,最近才遇到運行時錯誤,我不知道如何查找和修復。 該程序一旦啟動就意外完成,而當我運行調試時,它給了我錯誤:

下等停止,因為它從操作系統接收到信號。

信號名稱:SIGSEGV

信號含義:分段故障

現在,我知道此錯誤是由於嘗試訪問無效的內存位置引起的,但是我完全不知道觸發該錯誤的方法。 調試器似乎將我指向特定的代碼行:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QString>
#include "ui_mainwindow.h"
#include "foamdata.h"
#include "domaingeneration.h"


namespace Ui {
    class MainWindow;
}


class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    int getXDim() const { return ui->xDim->value(); } // THIS is where it points to!!
    int getYDim() const { return ui->yDim->value(); }


private slots:
    void on_findDir_clicked();

    void on_create_clicked();

    void on_generateDomain_clicked();

private:
    Ui::MainWindow *ui;
    DomainGeneration dg;    //declaring second window as a member of main window
};

#endif // MAINWINDOW_H

該函數用於:

#include "domaingeneration.h"
#include "ui_domaingeneration.h"
#include <QCheckBox>
#include "mainwindow.h"

DomainGeneration::DomainGeneration(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::DomainGeneration)
{
    ui->setupUi(this);

    // Generating checkboxes for domain generation
    MainWindow* main;
    int x_dim = main->getXDim();
    int y_dim = main->getYDim();
    QVector<QCheckBox*> checkBoxVector;
    for(int i = 0; i < x_dim; ++i){
        for(int j = 0; j < y_dim; ++j){
            checkBoxVector.append(new QCheckBox(this));
            checkBoxVector.last()->setGeometry(i * 20, j * 20, 20, 20);
        }
    }
}


DomainGeneration::~DomainGeneration()
{
    delete ui;
}

這是主窗口源代碼:

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "functions.h"
#include "main.cpp"
#include <QtGui/QApplication>
#include <QFileDialog>
#include <fstream>
#include "foamdata.h"
#include "domaingeneration.h"


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}




// This is the function that handles the directory search when the 'browse' button is pressed
void MainWindow::on_findDir_clicked()
{
    QString path;   //declaring the path to the base directory

    path = QFileDialog::getExistingDirectory(   //gathering the directory from QFileDialog class
        this, tr("Choose the project directory"),
        "/home",
        QFileDialog::ShowDirsOnly
        | QFileDialog::DontResolveSymlinks );

    ui->baseDir->setText( path );   //setting the retrieved path into the line edit box
}



// This function makes the project by creating a new directory with name 'project_name'
// in the base directory, and collects the OpenFOAM version number and simulation type
void MainWindow::on_create_clicked()
{

    QString project_name, foam_version, full_dir, slash, base_dir;
    base_dir = ui->baseDir->text();
    project_name = ui->projectName->text();     //getting the text from the 'projectName' field
    foam_version = ui->version->currentText();  //getting the selection from the 'version' drop-down box

    project_info.save_version(foam_version);        //saving data in a global project variable
    project_info.save_projName(project_name);
    project_info.save_simType(ui->simType->currentText());

    //first checking if the fields have input in them:
    QString blank = "";
    QString no_text0 = "Please enter project name";
    if( project_name==no_text0 || (project_name==blank) ) {
        ui->projectName->setText( no_text0 );
        return;
    }


    QString no_text1 = "Please enter a valid directory";
    if( base_dir==no_text1 || base_dir==blank || !QDir( base_dir ).exists() ) {
        ui->baseDir->setText( no_text1 );
        return;
    }


    slash = "/";        // needed to separate folders in the directory (can't use a literal)
    full_dir = base_dir.append(slash.append(project_name));
    project_info.save_directory(full_dir);

    if( !QDir(full_dir).exists() )  //check if directory already exists
        QDir().mkdir(full_dir);     //creating directory

    QString blockmesh_filename, suffix;
    suffix = "_blockMeshDict";
    slash = "/";    //must re-define
    blockmesh_filename = full_dir.append( slash.append( project_name.append(suffix) ) );
    std::ofstream create_file( blockmesh_filename.toStdString().c_str() );  //creating empty blockmesh file

}


void MainWindow::on_generateDomain_clicked()    //opening the new window for domain generation
{
    dg.show();
}

誰能幫助我找到到底發生了什么?

很明顯,您沒有初始化MainWindow * main;

MainWindow* main; // right here
int x_dim = main->getXDim();
int y_dim = main->getYDim();

但是,可能還有其他未初始化的值,所提供的代碼並沒有說太多。

或在這里:

// Generating checkboxes for domain generation
MainWindow* main;
int x_dim = main->getXDim();
int y_dim = main->getYDim();

main絕對不會指向任何地方!

您在類MainWindow中有一個私有數據成員ui ,它為NULL。 永遠不會設置該變量。 實際上,沒有辦法設置它。 (二傳手在哪里?)

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