一 MFC中定時器的使用

1.1、使用場景

定時讀寫數(shù)據(jù)，或者定時刷新界面，更新數(shù)據(jù)和狀態(tài)。

1.2、使用

（1）編寫OnTimer函數(shù)

void CMultipleCameraDlg::OnTimer(UINT_PTR nIDEvent)  //定時讀取數(shù)據(jù)
{
    if(nIDEvent == WM_TIMER_GRAB_INFO)
    {
        int nRet = 0;
        CString pos;
        int nPos = 0;
        pos.Format(_T("%d"), nPos);

        unsigned int nLostFrame = 0;
        unsigned int nFrameCount = 0;
        MV_MATCH_INFO_NET_DETECT stMatchInfoNetDetect = {0};
        MV_MATCH_INFO_USB_DETECT stMatchInfoUSBDetect = {0};

        for (int i = 0; i < m_nSelectDeviceNum; i++)
        {
            MV_CC_DEVICE_INFO stDevInfo = {0};
            m_pcMyCamera[i]->GetDeviceInfo(&stDevInfo);

            if (stDevInfo.nTLayerType == MV_GIGE_DEVICE)
            {
                nRet = m_pcMyCamera[i]->GetGevAllMatchInfo(&stMatchInfoNetDetect);
                nLostFrame = stMatchInfoNetDetect.nLostFrameCount;
                nFrameCount = stMatchInfoNetDetect.nNetRecvFrameCount;
            }
            else if (stDevInfo.nTLayerType == MV_USB_DEVICE)
            {
                nRet = m_pcMyCamera[i]->GetU3VAllMatchInfo(&stMatchInfoUSBDetect);
                nLostFrame = stMatchInfoUSBDetect.nErrorFrameCount;
                nFrameCount = stMatchInfoUSBDetect.nReceivedFrameCount;
            }
            else
            {
                return;
            }

            if (MV_OK == nRet)
            {
                switch(i)
                {
                case 0:
                    {
                        m_nFrameCount1Edit = nFrameCount;
                        m_nLostFrame1Edit = nLostFrame;
                    }
                    break;
                case 1:
                    {
                        m_nFrameCount2Edit = nFrameCount;
                        m_nLostFrame2Edit = nLostFrame;
                    }
                    break;
                case 2:
                    {
                        m_nFrameCount3Edit = nFrameCount;
                        m_nLostFrame3Edit = nLostFrame;
                    }
                    break;
                case 3:
                    {
                        m_nFrameCount4Edit = nFrameCount;
                        m_nLostFrame4Edit = nLostFrame;
                    }
                    break;
                default:
                    break;
                }
                UpdateData(FALSE);   //界面數(shù)據(jù)和自定義變量進行同步
            }
        }
    }

    CDialog::OnTimer(nIDEvent);
}

（2）啟動定時器

SetTimer(1,1000,NULL);      //參數(shù)：定時器標(biāo)號，定時時間（ms）。啟動定時器1，每隔1s刷新一次

（3）關(guān)閉定時器

 KillTimer(1);                               //關(guān)定時器1

二 QT中定時器使用

2.1 簡述

QTimer類提供了重復(fù)和單次觸發(fā)信號的定時器。

2.2 使用

（1）定義

QTimer *timer; // 定義的定時器

（2）使用

timer = new QTimer(this);
connect(timer,SIGNAL(timeout()),this,SLOT(function()));

// 調(diào)用自定義的槽函數(shù)
    timer->start(100);

（3）結(jié)束采集

timer->stop();