Qt 在与 QTableWidget 进行迭代时崩溃

分类：编程问答

如何解决Qt 在与 QTableWidget 进行迭代时崩溃

我有一个简单的 Qt 应用程序，它主要基于 QTableWidget，在那里我必须显示我从服务器获取的数据，并且用户必须能够修改和保存数据。

我仍在设置我的应用程序，问题是如果我完全与 QTableWidget 交互，我会得到一个 SEGFAULT。

错误：

error message

我已经尽可能地减少了代码

cila.cpp

#include "cila.h"
#include "ui_cila.h"

#include <QFile>
#include <QIODevice>
#include <QMessageBox>
#include <QInputDialog>


// ---  CORE  --- //
CILA::CILA(QWidget *parent) : QMainWindow(parent),ui(new Ui::CILA) {
    ui->setupUi(this);

    // --- LINKS --- //
    //QAction* salvaLayout = CILA::findChild<QAction*>("actionSalva_Layout");
    QTableWidget* tableLavori = CILA::findChild<QTableWidget*>("tableWidget");

    // --- CONNECTIONS --- //
    //connect(salvaLayout,&QAction::triggered,this,&CILA::saveDimCol);
    connect(tableLavori->horizontalHeader(),&QHeaderView::sectionResized,[this](int i,int od,int nd) {if (i != 4) dimColonne[i] = nd;});

    // --- INITIALIZATION --- //
    numeroColonne = tableLavori->columnCount()-1;

    convertDimCol(getDimCol());
    setDimCol();

}

CILA::~CILA() {
    delete ui;
}
// ---  END CORE  --- //


// ---  COLONNE  --- //
void CILA::saveDimCol() {
    qDebug() << "---== CILA::saveDimCol() ==---";
    QFile file("dimensioni.col");
    if (!file.open(QIODevice::WriteOnly)) {
        QMessageBox::information(0,"Error",file.errorString());
        return;
    }

    QTextStream out(&file);
    QString dimensioni = "";

    for (unsigned int i = 0; i < numeroColonne; i++) {
        dimensioni += QString(std::to_string(tableLavori->columnWidth(i)).c_str());
        if (i != 3) dimensioni += ";";
    }

    qDebug() << "ABOUT TO WRITE: " << dimensioni;
    out << dimensioni;
    qDebug() << "---== return CILA::saveDimCol() ==---";
}

void CILA::setDimCol() {
    qDebug() << "---== CILA::setDimCol() ==---";

    qDebug() << "TEST";
    qDebug() << tableLavori->columnCount(); // Now it crashes here,these lines where introduced to test what was wrong with QTableWidget
    for (unsigned int i = 0; i < numeroColonne; i++)
        qDebug() << "WIDTH OF COLUMN" << i << "IS" << tableLavori->columnWidth(i);
    qDebug() << "END OF TEST";

    for (unsigned int i = 0; i < numeroColonne; i++){
        qDebug() << "i =" << i << ";" << i << "<" << numeroColonne << "| dimColonne[i] =" << dimColonne[i];
        tableLavori->setColumnWidth(i,dimColonne[i]); // Original crash point was here
        qDebug() << "Succesfully set column" << i << "to width" << dimColonne[i];
    }
    qDebug() << "---== return CILA::setDimCol() ==---";
}

QList<int> CILA::getDimCol() {
    qDebug() << "---== CILA::getDimCol() ==---";
    QList<int> dimensioniColonne;
    QFile file("dimensioni.col");  // The content of this file is "200;200;200;200"
    if (!file.exists()) {
        for (unsigned int i = 0; i < numeroColonne; i++)
            dimensioniColonne.append(tableLavori->columnWidth(i));
        qDebug() << "ERROR; FILE DOES NOT EXIST";
        return dimensioniColonne;
    }

    if (!file.open(QIODevice::ReadOnly)) {
        QMessageBox::information(0,file.errorString());
        qDebug() << "ERROR; FILE IS READONLY";
        return dimensioniColonne;
    }

    QTextStream in(&file);

    QString out = in.readLine();
    qDebug() << "Content read from file: " << out;

    for (const QString &_item : out.split(";")) {
        dimensioniColonne.append(_item.toInt());
        qDebug() << "_ITEM (=" << _item << ") has been appended to the returning list";
    }

    qDebug() << "RETURNING VALUE QLIST<INT> =" << dimensioniColonne;
    qDebug() << "---== return CILA::getDimCol() ==---";
    return dimensioniColonne;
}

void CILA::convertDimCol(QList<int> dimCol) {
    qDebug() << "---== CILA::convertDimCol() ==---";
    qDebug() << "PARAMS:  -1- QList<int> dimCol =" << dimCol;
    for (unsigned int i = 0; i < numeroColonne; i++) {
        qDebug() << "----------------------------------------";
        qDebug() << "i =" << i << ";" << i << "<" << numeroColonne;
        qDebug() << "dimColonne[" << i << "] = dimCol[" << i << "] (=" << dimCol[i] << ")";
        dimColonne[i] = dimCol[i];
    }
    qDebug() << "---== return CILA::convertDimCol() ==---";
}
// ---  END COLONNE  --- //

cila.h

#ifndef CILA_H
#define CILA_H

#include <QMainWindow>
#include <QTableWidget>

QT_BEGIN_NAMESPACE
namespace Ui { class CILA; }
QT_END_NAMESPACE

class CILA : public QMainWindow
{
    Q_OBJECT

public:
    CILA(QWidget *parent = nullptr);
    ~CILA();
    QTableWidget* tableLavori;
    unsigned int numeroColonne;
    int dimColonne[4];

private:
    Ui::CILA *ui;
    //---COLONNE---//
    void setDimCol();
    void saveDimCol();
    QList<int> getDimCol();
    void convertDimCol(QList<int> dimCol);
    //---END_COLONNE---//
};
#endif // CILA_H

dimensioni.col

200;200;200;200

您在这里看到的代码取自我编写的另一个应用程序，我只做了一些小改动，但即使我直接从我的另一个应用程序导入所有代码并且没有更改任何内容，它仍然会崩溃。

另一个应用程序运行良好，每天都在使用。

控制台输出：

15:08:11: Starting /home/davide/Qt-Projs/build-CILA-Desktop_Qt_6_1_1_GCC_64bit-Debug/CILA ...
---== CILA::getDimCol() ==---
Content read from file:  "200;200;200;200"
_ITEM (= "200" ) has been appended to the returning list
_ITEM (= "200" ) has been appended to the returning list
_ITEM (= "200" ) has been appended to the returning list
_ITEM (= "200" ) has been appended to the returning list
RETURNING VALUE QLIST<INT> = QList(200,200,200)
---== return CILA::getDimCol() ==---
---== CILA::convertDimCol() ==---
PARAMS:  -1- QList<int> dimCol = QList(200,200)
----------------------------------------
i = 0 ; 0 < 4
dimColonne[ 0 ] = dimCol[ 0 ] (= 200 )
----------------------------------------
i = 1 ; 1 < 4
dimColonne[ 1 ] = dimCol[ 1 ] (= 200 )
----------------------------------------
i = 2 ; 2 < 4
dimColonne[ 2 ] = dimCol[ 2 ] (= 200 )
----------------------------------------
i = 3 ; 3 < 4
dimColonne[ 3 ] = dimCol[ 3 ] (= 200 )
---== return CILA::convertDimCol() ==---
---== CILA::setDimCol() ==---
TEST
15:08:11: The program has unexpectedly finished.
15:08:11: The process was ended forcefully.
15:08:11: /home/davide/Qt-Projs/build-CILA-Desktop_Qt_6_1_1_GCC_64bit-Debug/CILA crashed.

我已经尝试清理项目，运行 qmake 并在网上搜索类似我的问题，但无济于事，根据我的经验，这意味着这是一个愚蠢的错误，但我仍然不知道为什么它在与我交互时崩溃QTableWidget。

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