MFC 定时器

定义定时器ID

#define TIMER_ID_CONTROL1    10000
#define TIMER_ID_CONTROL2    10001
#define TIMER_ID_CALLBACK    10002

 

 

设置定时器

    SetTimer(TIMER_ID_CONTROL1, 1*1000, NULL);//如果设置的等待时间比处理时间短，程序会出问题
    SetTimer(TIMER_ID_CONTROL2, 2*1000, NULL);
    SetTimer(TIMER_ID_CALLBACK, 3*1000, (TIMERPROC)TimerProc);

 

 

销毁定时器

    KillTimer(TIMER_ID_CONTROL1);
    KillTimer(TIMER_ID_CONTROL2);
    KillTimer(TIMER_ID_CALLBACK);

 

 

Ontimer

void CMFCTimerDlg::OnTimer(UINT_PTR nIDEvent)
{
    CString str;
    switch (nIDEvent)
    {
    case TIMER_ID_CONTROL1:
        {
            str.Format("CONTROL1 : %d", m_uiTimeClickControl1++);
            SetDlgItemText(IDC_EDIT1, str);
        }
        break;
    case TIMER_ID_CONTROL2:
        {
            str.Format("CONTROL2 : %d", m_uiTimeClickControl2++);
            SetDlgItemText(IDC_EDIT2, str);
        }
        break;
    }

    CDialog::OnTimer(nIDEvent);
}

 

回调例子

  static void CALLBACK TimerProc(HWND hwnd,UINT uMsg,UINT_PTR idEvent,DWORD dwTime);

#include <TlHelp32.h>
void CALLBACK CMFCTimerDlg::TimerProc( HWND hwnd,UINT uMsg,UINT_PTR idEvent,DWORD dwTime )
{
    switch (idEvent)
    {
    case TIMER_ID_CALLBACK:
        {        
            size_t uCount = 0;
            HANDLE hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
            if (INVALID_HANDLE_VALUE != hSnap)
            {
                PROCESSENTRY32 item;
                item.dwSize = sizeof(item);
                if (Process32First(hSnap, &item))
                {
                    CString str;                    
                    do 
                    {
                        str = item.szExeFile;
                        if (0 == str.CompareNoCase("notepad.exe"))
                        {
                            uCount++;
                        }
                    } while (Process32Next(hSnap, &item));
                }

                CloseHandle(hSnap);
                hSnap = INVALID_HANDLE_VALUE;
            } 
            if (uCount < 2)
            {
                STARTUPINFO si;
                PROCESS_INFORMATION pi;
                memset(&pi, 0, sizeof(pi));
                memset(&si, 0, sizeof(STARTUPINFO));
                si.cb = sizeof(STARTUPINFO);//设定结构的大小    
                si.dwFlags = STARTF_USESHOWWINDOW;//以最小化运行
                si.wShowWindow = SW_SHOWMINNOACTIVE;//以最小化运行
                CreateProcess(NULL,
                    "notepad.exe",
                    NULL,
                    NULL,
                    FALSE,
                    NORMAL_PRIORITY_CLASS,
                    NULL,
                    NULL,
                    &si,
                    &pi);                                            
            }
        }
        break;
    }
}