c++自定义计时器使用

背景：在非窗口类中需要使用定时器，来实现心跳检测功能。
参考：
http://blog.csdn.net/bookish_2010_prj/article/details/6631938
http://blog.sina.com.cn/s/blog_4dbcd2730100xc69.html


核心API：SetTimer。


vs2005创建对话框示例工程。

效果图如下。

自定义计时器，不依赖窗口类，封装计时器的生成和释放。
MyTimer.h如下。

/*
非窗口类实现定时器
参考：
http://blog.csdn.net/bookish_2010_prj/article/details/6631938
http://blog.sina.com.cn/s/blog_4dbcd2730100xc69.html
*/
#pragma once
#include <map>
using namespace std;

class CMyTimerUseDlg;
typedef map<UINT, CMyTimerUseDlg*> COwnerMap;

class CMyTimer 
{
public:
    CMyTimer();
    virtual ~CMyTimer();

    //设置定时器，nElapse表示时间间隔
    void SetMyTimer(UINT nElapse, CMyTimerUseDlg* pOwner);
    //销毁该实例的定时器
    void KillMyTimer();
    //获取定时器ID
    UINT GetTimerID();

private:
    //静态成员函数，用于处理定时器的消息
    static void CALLBACK MyTimerProc(HWND hwnd,UINT uMsg,UINT idEvent,DWORD dwTime);

private:
    //静态数据成员，映射表类，用于保存定时器拥有者
    static COwnerMap m_sTimeMap;

    //保存该实例的定时器标志值
    UINT m_nTimerID;
};

MyTimer.cpp如下。

#include "StdAfx.h"
#include "MyTimer.h"
#include "MyTimerUseDlg.h"

COwnerMap CMyTimer::m_sTimeMap;

CMyTimer::CMyTimer()
: m_nTimerID(-1)
{

}

CMyTimer::~CMyTimer()
{

}

void CALLBACK CMyTimer::MyTimerProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime)
{
    CMyTimerUseDlg* pOwner = m_sTimeMap[idEvent];
    if (pOwner != NULL)
    {
        pOwner->RefreshTime(idEvent);
    }
}

void CMyTimer::SetMyTimer(UINT nElapse, CMyTimerUseDlg* pOwner)
{
    if (m_nTimerID != -1)
    {
        //定时器已经设置则返回
        return;
    }

    m_nTimerID = (UINT)SetTimer(NULL,NULL,nElapse,MyTimerProc);

    m_sTimeMap[m_nTimerID] = pOwner;
}

void CMyTimer::KillMyTimer()
{
    KillTimer(NULL, m_nTimerID);

    COwnerMap::iterator mFindPos = m_sTimeMap.find(m_nTimerID);
    if (mFindPos != m_sTimeMap.end())
    {
        m_sTimeMap.erase(mFindPos);
    }

    m_nTimerID = -1;
}

UINT CMyTimer::GetTimerID()
{
    return m_nTimerID;
}

对话框类实现MyTimerUseDlg.h。

// MyTimerUseDlg.h : header file
//

#pragma once
#include "MyTimer.h"
#include "resource.h"

// CMyTimerUseDlg dialog
class CMyTimerUseDlg : public CDialog
{
// Construction
public:
	CMyTimerUseDlg(CWnd* pParent = NULL);	// standard constructor

// Dialog Data
	enum { IDD = IDD_MYTIMERUSE_DIALOG };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV support


// Implementation
public:
    void RefreshTime(UINT idEvent);

protected:
	HICON m_hIcon;

	// Generated message map functions
	virtual BOOL OnInitDialog();
	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
    afx_msg void OnBnClickedStart();
    afx_msg void OnBnClickedEnd();
	DECLARE_MESSAGE_MAP()

private:
    CMyTimer m_ChinaTimer;
    CMyTimer m_USATimer;
};

对话框类实现MyTimerUseDlg.cpp。

// MyTimerUseDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MyTimerUse.h"
#include "MyTimerUseDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

// CMyTimerUseDlg dialog

CMyTimerUseDlg::CMyTimerUseDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMyTimerUseDlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMyTimerUseDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CMyTimerUseDlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
    ON_BN_CLICKED(IDC_BTN_START, &CMyTimerUseDlg::OnBnClickedStart)
    ON_BN_CLICKED(IDC_BTN_END, &CMyTimerUseDlg::OnBnClickedEnd)
END_MESSAGE_MAP()


// CMyTimerUseDlg message handlers

BOOL CMyTimerUseDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

	// TODO: Add extra initialization here

	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CMyTimerUseDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{

	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CMyTimerUseDlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMyTimerUseDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}


void CMyTimerUseDlg::OnBnClickedStart()
{
    m_ChinaTimer.SetMyTimer(1000, this);
    m_USATimer.SetMyTimer(1000, this);
}

void CMyTimerUseDlg::OnBnClickedEnd()
{
    m_ChinaTimer.KillMyTimer();
    m_USATimer.KillMyTimer();
}

void CMyTimerUseDlg::RefreshTime(UINT idEvent)
{
    UINT nChinaID = m_ChinaTimer.GetTimerID();
    UINT nUSAID =  m_USATimer.GetTimerID();

    if (idEvent == nChinaID)
    {
        CTime sysTime = CTime::GetCurrentTime();
        SetDlgItemText(IDC_CHINA_TIME, sysTime.Format(_T("%Y-%m-%d %H:%M:%S")));
    }
    else if (idEvent == nUSAID)
    {
        //太平洋时间与北京时间，15个小时时差
        CTime sysTime = CTime::GetCurrentTime();
        CTimeSpan timeSpan = CTimeSpan(0, 15, 0, 0);
        sysTime -= timeSpan;

        SetDlgItemText(IDC_USA_TIME, sysTime.Format(_T("%Y-%m-%d %H:%M:%S")));
    }
}