random.cpp

使非MFC窗口程序的窗口回调过程成为C++类的成员函数。

#include "stdafx.h"
#include "random.h"


unsigned long CRandom::m_lNext = 1;


CRandom::CRandom() : m_hThread(NULL), m_dwThread(0), m_uRandom(0)
{
}


CRandom::~CRandom()
{
	EndThread();
}


int CRandom::rand(void)
{
	m_lNext = m_lNext * 1103515245 + 12345;
	return (unsigned int)(m_lNext / (2 * (RAND_MAX+1L)) % (RAND_MAX+1L));
}


void CRandom::srand(unsigned int seed)
{
	m_lNext = seed;
}


unsigned long CRandom::GetRandom()
{
	return m_uRandom + rand();
}


bool CRandom::StartThread()
{
	if(m_hThread != NULL)
		return false;
	srand(time(NULL));
	m_hThread = (HANDLE)_beginthreadex
		(
		(void *)NULL,
		(unsigned)0,
		(PTHREAD_START)RandomThread,
		(void *)this,
		(unsigned)0,
		(unsigned *)&m_dwThread
		);
	if(m_hThread == NULL)
		return false;
	return true;
}


void CRandom::EndThread()
{
	if(m_hThread)
	{
		PostThreadMessage(m_dwThread, WM_USER+100, 0, 0);
		WaitForSingleObject(m_hThread, 500);
		CloseHandle(m_hThread);
		m_hThread = NULL;
	}
	m_dwThread = 0;
}


DWORD WINAPI CRandom::RandomThread(void *pvParam)
{
	MSG			msg;
	CRandom		*pRandom = (CRandom *)pvParam;
	DWORD		dwSleep;

	while(1)
	{
		if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
		{
			if(msg.message == WM_USER+100)
				break;
		}
		dwSleep = 10 + pRandom->rand() % 150;
		Sleep(dwSleep);
		pRandom->m_uRandom = (unsigned long)pRandom->rand();
	}
	return 0;
}