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QLogin::QLogin(QWidget *parent /*= 0*/) : QDialog(parent){ m_sharedMen = new QSharedMemory("SWARTZ 1.0"); ...} bool QLogin::IsRunning(){ volatile int i = 2; while (i--) { if (m_sharedMen->attach(QSharedMemory::ReadOnly)) { m_sharedMen->detach(); } } if (!m_sharedMen->create(1)) { return true; } return false;} QLogin::~QLogin(){ delete(m_sharedMen);} QLogin login;if (login.IsRunning()){ QMessageBox::about(NULL, QObject::tr("warning"), QObject::tr("App has been started")); return 0;} 转载地址：http://zvqxi.baihongyu.com/