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C++坐昼協扮匂

作者 佚名技术 来源 程序设计 浏览 发布时间 2012-05-23
                                  *
* All I ask is that if you use LRTimer in your project retain the               *
* copyright notice. If you have any comments and suggestions please email me    *
* max[at]remoteSOS[dot]com                                                      *
*                                                                               *
****************************************************************************** */

#ifndef LRTIMER_H__
#define LRTIMER_H__

#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0500
#endif

// compile with: /MT /D "_X86_" /c
// processor: x86

#include <windows.h>
#include <process.h> /* _beginthread, _endthread */
#include <stdio.h>
#include <assert.h>

// define a second in terms of 100ns - used with waitable timer API
#define _SECOND 10000

typedef VOID (*LRTCallbackEventProc)(VOID*);

class LRTimer 
{
public:
    // default constructor with 1 second interval
    LRTimer(DWORD dwInterval=1000);

    // default destructor
    ~LRTimer();

    // starts timer by creating new thread. interval must be set earlier
    VOID start();

    // starts timer with given interval in miliseconds
    VOID start(DWORD _interval_ms);

    // stops the timer
    VOID stop();

    // sets time interval in miliseconds
    VOID setInterval(DWORD _interval_ms);

    // returns time interval in ms
    DWORD getInterval();

    // sets function that will be called on time expiration
    VOID setCallbackProc( LRTCallbackEventProc pcbEventProc,  VOID* pcbParam );

    // returns true if LRtimer is currently running
    BOOL isRunning();

    // It should be used if the worker class will use CRT functions
    static HANDLE CrtCreateThread(LPSECURITY_ATTRIBUTES lpsa, DWORD dwStackSize, LPTHREAD_START_ROUTINE pfnThreadProc, void *pvParam, DWORD dwCreationFlags, DWORD *pdwThreadId) throw()
    {
        // sanity check for pdwThreadId
        assert(sizeof(DWORD) == sizeof(unsigned int)); 

        // _beginthreadex calls CreateThread which will set the last error value before it returns
        return (HANDLE) _beginthreadex(lpsa, dwStackSize, (unsigned int (__stdcall *)(void *)) pfnThreadProc, pvParam, dwCreationFlags, (unsigned int *) pdwThreadId);
    }

private:
    DWORD   m_dwInterval;  // interval between alarms

    LRTCallbackEventProc m_pCallback;  // pointer to user callback function
    VOID                *m_pcbParam; // pointer to user callback parameter

    BOOL    m_bRunning;  // timer running state
    HANDLE  m_hTimerThread;  // handle to timer thread
    DWORD   m_iID;  // timer thread id - added for compatibility with Win95/98

    // timer clock

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