QT The inferior stopped because it received a signal from the operating system.
这个错误说明程序中有野指针。
遇到两次问题：
1.在MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent)函数中：
先运行了函数emit checkPorts();然后才定义Timer_Label = new QTimer(this);
解决：Timer_Label = new QTimer(this)
emit checkPorts();
先定义，后运行即可。
2.使用QMenu *m_menu = new QMenu();在mainwindow.h中未定义
mainwindow.h中增加class QMenu;
mainwindow.cpp中增加#include <QMenu>
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