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MFC工控项目实例二十五多媒体定时计时器

article 2024/10/21 9:38:49

承接专栏《MFC工控项目实例二十四模拟量校正值输入》
用多媒体定时器实现0.1秒计时器
1、在SEAL_PRESSUREDlg.h文件中添加代码

#include<MMSystem.h>
#pragma comment(lib,"winmm.lib")

class CSEAL_PRESSUREDlg : public CDialog
{
public:
	CSEAL_PRESSUREDlg(CWnd* pParent = NULL);	// standard constructor
	
...
    bool m_isStart,m_isStop;
	UINT timerID;//自己添加的定时器ID变量	
	void DestroyTimer();//自己声明的销毁定时器函数
	UINT CreateTimer();//自己声明的创建定时器函数
	void OnTimer(UINT nIDEvent);
    static void CALLBACK TimeProc(UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2);//定时器回调函数
    int t_time;
    }

2 、在SEAL_PRESSUREDlg.cpp文件中添加代码

void CSEAL_PRESSUREDlg::OnTesStart() 
{
	if (m_isStop)
		{
			m_TES_START.SetIcon(IDI_TES_START); 
        m_TES_START.SetAlign(CButtonST::ST_ALIGN_VERT);
		((CButton *)GetDlgItem(IDC_TES_START))->SetWindowText(m_isStop ? "结束测试" : "开始测试");	
		 DestroyTimer();
         m_isStop=0;
		}
		else
		{ 
			 
       	t_time=0;
		m_TES_START.SetIcon(IDI_TES_STOP); 
        m_TES_START.SetAlign(CButtonST::ST_ALIGN_VERT);
		((CButton *)GetDlgItem(IDC_TES_START))->SetWindowText(m_isStop ? "结束测试" : "开始测试");	
			CreateTimer();		 
	    m_isStop=1;
		}
   

}


UINT CSEAL_PRESSUREDlg::CreateTimer()
{
	timeBeginPeriod(1);//设置定时器设备的最小时间分辨率
	timerID = timeSetEvent(100, 1, TimeProc, (DWORD)this, TIME_PERIODIC);
	return timerID;//返回定时器ID

}


void CSEAL_PRESSUREDlg::DestroyTimer()
{
	timeKillEvent(timerID);//销毁定时器
	timeEndPeriod(1);//清除上次调用 timeBeginPeriod 函数时指定的最小计时器分辨率
}



void CALLBACK CSEAL_PRESSUREDlg::TimeProc(UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2)
{
	CSEAL_PRESSUREDlg* time_dlg = (CSEAL_PRESSUREDlg*)dwUser;
	time_dlg->OnTimer(uID );
 }





void CSEAL_PRESSUREDlg::OnTimer(UINT nIDEvent)
{

           t_time++;
           CString str_t2_6,str_t2_5,str_t2_4,str_t2_3,str_t2_2,str_t2_1;
		   int	 t2=t_time;		   	   
		   str_t2_5.Format("%d",t2%10);
		   str_t2_4.Format("%d",(t2/10)%10);
		   str_t2_3.Format("%d",(t2/100)%10);
		   str_t2_2.Format("%d",(t2/1000)%10);
		   str_t2_1.Format("%d",(t2/10000)%10);		  
           SetDlgItemText(IDC_STATIC4,str_t2_5);
           SetDlgItemText(IDC_STATIC3,".");
		   SetDlgItemText(IDC_STATIC2,str_t2_4);		 
		   SetDlgItemText(IDC_STATIC1,str_t2_3);
		   SetDlgItemText(IDC_STATIC0,str_t2_2);
		 
}