Question

我正在使用Qt5。在我正在编写的程序中，我有一个带有非常简单的构造函数的类。问题是，当我检查Valgrind的问题时，我会在每个作业中得到“无效的写入大小”。

这是标题：

#ifndef RS22812_H
#define RS22812_H

#include <QObject>

class RS22812 : public QObject
{
    Q_OBJECT
public:
    explicit RS22812(QObject *parent = 0);
    ~RS22812();
private:
    uint mode;
    Flags flags;
    QString byte2Digit(uchar byte);

signals:
    void modeChanged(uint newmode);

public slots:
    void newValue(const QByteArray &data);
};

#endif // RS22812_H

cpp文件中的构造函数定义：

RS22812::RS22812(QObject *parent) : QObject(parent)
{
    mode=0;
}

Valgrind在QObject（父级）和mode = 0：

时都给出了错误

Invalid write of size 4
  in RS22812::RS22812(QObject*) in /home/javi/ProgrammingProjects/multimeterGUI/rs22812.cpp:4
  1: RS22812::RS22812(QObject*) in /home/javi/ProgrammingProjects/multimeterGUI/rs22812.cpp:4
  2: MainWindow::MainWindow(QWidget*) in /home/javi/ProgrammingProjects/multimeterGUI/mainwindow.cpp:29
  3: main in /home/javi/ProgrammingProjects/multimeterGUI/main.cpp:7
Address 0x1c4ad500 is 0 bytes after a block of size 16 alloc'd  1: operator new(unsigned long) in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so
  2: MainWindow::MainWindow(QWidget*) in /home/javi/ProgrammingProjects/multimeterGUI/mainwindow.cpp:29
  3: main in /home/javi/ProgrammingProjects/multimeterGUI/main.cpp:7

Invalid write of size 4
  in RS22812::RS22812(QObject*) in /home/javi/ProgrammingProjects/multimeterGUI/rs22812.cpp:6
  1: RS22812::RS22812(QObject*) in /home/javi/ProgrammingProjects/multimeterGUI/rs22812.cpp:6
  2: MainWindow::MainWindow(QWidget*) in /home/javi/ProgrammingProjects/multimeterGUI/mainwindow.cpp:29
  3: main in /home/javi/ProgrammingProjects/multimeterGUI/main.cpp:7
Address 0x1c4ad500 is 0 bytes after a block of size 16 alloc'd  1: operator new(unsigned long) in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so
  2: MainWindow::MainWindow(QWidget*) in /home/javi/ProgrammingProjects/multimeterGUI/mainwindow.cpp:29
  3: main in /home/javi/ProgrammingProjects/multimeterGUI/main.cpp:7

我不明白这么简单的任务怎么会导致错误。谢谢你的建议。

Answer 1

尝试了几件事之后，似乎问题出现在QtCreator上。当我清理项目时，它编译没有问题。

在构造函数中写入大小为4无效

1 个答案: