您好 我正在QT 4.6.2中实现一个简单的线程GUI应用程序。我在没有继承它的情况下使用QThread。我在start()函数中调用了usleep()函数,但这会导致GUI冻结。我该如何解决这个问题。以下是代码
#ifndef ECGREADER_H
#define ECGREADER_H
#include<QObject>
class ecgreader : public QObject
{
Q_OBJECT
public:
ecgreader(QObject *parent=0);
~ecgreader();
public Q_SLOTS:
void start();
Q_SIGNALS:
void finished();
};
#endif // ECGREADER_H
下面是start()函数
void ecgreader::start()
{
int i= system("ls>output.txt");
SLEEP(10000);
if(i==0)
{
emit finished();
}
}
最后在这里开始调用
void Application::onbtnclicked()
{
QThread* thread=new QThread;
ecgreader* reader=new ecgreader;
reader->moveToThread(thread);
connect(thread,SIGNAL(started()),reader,SLOT(start()));
connect(reader,SIGNAL(finished()),thread,SLOT(quit()));
connect(reader,SIGNAL(finished()),reader,SLOT(deleteLater()));
connect(reader,SIGNAL(finished()),thread,SLOT(deleteLater()));
reader->start();
}
请帮忙
答案 0 :(得分:2)
你有两个问题:首先你创建了线程,但是你从未启动它。其次,你直接在阅读器上调用start()而不是发出信号。
我认为你的意思是调用thread-&gt; start()而不是reader-&gt; start():
void Application::onbtnclicked()
{
QThread* thread=new QThread;
ecgreader* reader=new ecgreader;
reader->moveToThread(thread);
connect(thread,SIGNAL(started()),reader,SLOT(start()));
connect(reader,SIGNAL(finished()),thread,SLOT(quit()));
connect(reader,SIGNAL(finished()),reader,SLOT(deleteLater()));
connect(reader,SIGNAL(finished()),thread,SLOT(deleteLater()));
thread->start();
}