【Qt-19】按Q退出应用程序

如何将Qt窗口应用程序改成控制台程序呢？

下面进入正文，如何控制控制台程序退出呢？

这里采用线程方式，通过单独线程监视用户输入来执行是否退出程序。

 监视线程头文件thread.h

#include 
#include "TDRServerDLL.h"
 
class CMyKeyEventThread : public QThread
{
	Q_OBJECT
public:
	explicit CMyKeyEventThread(QObject *parent = 0);
 
protected:
	void run();
};

监视线程源文件thread.cpp

//按"Q"键退出应用程序
 
#include "thread.h"
#include 
 
CMyKeyEventThread::CMyKeyEventThread(QObject *parent) : QThread(parent)
{
 
}
 
void CMyKeyEventThread::run()
{
	const char *pszTip = "Press 'Q' exit application.\n";
	printf("%s\n", pszTip);
 
	while (true)
	{
		printf("%s", pszTip);
		if (getchar() == 'Q')
		{
            //这里为程序退出前需执行的操作
			mwArray result;
			TDRSvrStopScan(1, result);
 
			printf("Done.");
			TDRSvrUninit();
 
			break;
		}
	}
 
	printf("Done.");
}

main.cpp

#include "mainwindow.h"
#include "thread.h"
#include 
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    //w.show();
 
	CMyKeyEventThread *exitEvent = new CMyKeyEventThread();
	QObject::connect(exitEvent, SIGNAL(finshed()), &a, SLOT(quit())); //连接信号
	exitEvent->start();//启动线程
 
    return a.exec();
}