ex090105dlg.cpp

来自「深入浅出Visual C++入门进阶与应用实例 随书光盘 作者 何志丹」· C++ 代码 · 共 420 行

// Ex090105Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "Ex090105.h"
#include "Ex090105Dlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEx090105Dlg dialog

CEx090105Dlg::CEx090105Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CEx090105Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CEx090105Dlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CEx090105Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CEx090105Dlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CEx090105Dlg, CDialog)
	//{{AFX_MSG_MAP(CEx090105Dlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_TEST, OnTest)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEx090105Dlg message handlers

BOOL CEx090105Dlg::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 CEx090105Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	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 CEx090105Dlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (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 to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CEx090105Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

class CNode //节点类
{
public :
	CNode(){ m_pNextNode = NULL ;};
	//数据部分略
	CNode*	m_pNextNode ;
} ;

CNode g_Root ;//节点的根

UINT GetRandNum0To100()
{
	//调用若干次随机数,避免每次使用时,随机数都相同.
	CTime t = CTime::GetCurrentTime();
	for(int i = 0 ; i < t.GetSecond() ; i++ )
		rand();
	
	return rand() % 100  ;
}

UINT GetCount()
{
	UINT iCount = 1 ;//计算节点的个数,包括根节点
	for(CNode * pNode = &g_Root  ; NULL != pNode->m_pNextNode ; pNode = pNode->m_pNextNode)
		iCount++ ;	
	return iCount ;
}

/* 不处理同步
void Init()
{
}

void Release()//释放所以节点的内存
{
	CNode * pNode = g_Root.m_pNextNode ;
	while(NULL != pNode)
	{
		CNode * pDeleteNode = pNode ;
		pNode = pNode->m_pNextNode ;
		delete pDeleteNode ;
	}
	g_Root.m_pNextNode = NULL ;
}

ULONG WINAPI AddTail(LPVOID pParam)
{
	//找到最后一个节点
	for(CNode * pNode = &g_Root ; NULL != pNode->m_pNextNode ; pNode = pNode->m_pNextNode);	
	
	//让线程体眠一会.用这个操作来模拟一个费用操作,并假定这个费用操作花的时间可能不同
	int nRand = GetRandNum0To100() ;
	Sleep(nRand);//休息nRand豪秒
	
	pNode->m_pNextNode = new CNode ;
	
	return 1 ;
}
*/

/* 使用临界区
CRITICAL_SECTION g_CritSec ;

void Init()
{
	InitializeCriticalSection(&g_CritSec);
}

void Release()//释放所以节点的内存
{
	CNode * pNode = g_Root.m_pNextNode ;
	while(NULL != pNode)
	{
		CNode * pDeleteNode = pNode ;
		pNode = pNode->m_pNextNode ;
		delete pDeleteNode ;
	}
	g_Root.m_pNextNode = NULL ;

	DeleteCriticalSection(&g_CritSec);
}

ULONG WINAPI AddTail(LPVOID pParam)
{
	EnterCriticalSection(&g_CritSec);

	//找到最后一个节点
	for(CNode * pNode = &g_Root ; NULL != pNode->m_pNextNode ; pNode = pNode->m_pNextNode);	
	
	//让线程体眠一会.用这个操作来模拟一个费用操作,并假定这个费用操作花的时间可能不同
	int nRand = GetRandNum0To100() ;
	Sleep(nRand);//休息nRand豪秒
	
	pNode->m_pNextNode = new CNode ;

	LeaveCriticalSection(&g_CritSec);	
	return 1 ;
}
*/

/* 互斥量
HANDLE g_hMutex ;

void Init()
{
	g_hMutex = CreateMutex(NULL,FALSE,"Ex090105");
}

void Release()//释放所以节点的内存
{
	CNode * pNode = g_Root.m_pNextNode ;
	while(NULL != pNode)
	{
		CNode * pDeleteNode = pNode ;
		pNode = pNode->m_pNextNode ;
		delete pDeleteNode ;
	}
	g_Root.m_pNextNode = NULL ;

	CloseHandle(g_hMutex);
}

ULONG WINAPI AddTail(LPVOID pParam)
{
	WaitForSingleObject(g_hMutex,INFINITE);	

	//找到最后一个节点
	for(CNode * pNode = &g_Root ; NULL != pNode->m_pNextNode ; pNode = pNode->m_pNextNode);	
	
	//让线程体眠一会.用这个操作来模拟一个费用操作,并假定这个费用操作花的时间可能不同
	int nRand = GetRandNum0To100() ;
	Sleep(nRand);//休息nRand豪秒
	
	pNode->m_pNextNode = new CNode ;
	
	ReleaseMutex(g_hMutex);
	return 1 ;
}
*/

/* 使用 信号量
HANDLE g_hSemaphore ;

void Init()
{
	g_hSemaphore = CreateSemaphore(NULL,1,1,"Ex090105");
}

void Release()//释放所以节点的内存
{
	CNode * pNode = g_Root.m_pNextNode ;
	while(NULL != pNode)
	{
		CNode * pDeleteNode = pNode ;
		pNode = pNode->m_pNextNode ;
		delete pDeleteNode ;
	}
	g_Root.m_pNextNode = NULL ;

	CloseHandle(g_hSemaphore);
}

ULONG WINAPI AddTail(LPVOID pParam)
{
	WaitForSingleObject(g_hSemaphore,INFINITE);	

	//找到最后一个节点
	for(CNode * pNode = &g_Root ; NULL != pNode->m_pNextNode ; pNode = pNode->m_pNextNode);	
	
	//让线程体眠一会.用这个操作来模拟一个费用操作,并假定这个费用操作花的时间可能不同
	int nRand = GetRandNum0To100() ;
	Sleep(nRand);//休息nRand豪秒
	
	pNode->m_pNextNode = new CNode ;

	ReleaseSemaphore(g_hSemaphore,1,NULL);
	
	return 1 ;
}*/

HANDLE g_hEvent ;

void Init()
{
	g_hEvent = CreateEvent(NULL,FALSE,TRUE,"Ex090105");
}

void Release()//释放所以节点的内存
{
	CNode * pNode = g_Root.m_pNextNode ;
	while(NULL != pNode)
	{
		CNode * pDeleteNode = pNode ;
		pNode = pNode->m_pNextNode ;
		delete pDeleteNode ;
	}
	g_Root.m_pNextNode = NULL ;

	CloseHandle(g_hEvent);
}

ULONG WINAPI AddTail(LPVOID pParam)
{
	WaitForSingleObject(g_hEvent,INFINITE);	

	//找到最后一个节点
	for(CNode * pNode = &g_Root ; NULL != pNode->m_pNextNode ; pNode = pNode->m_pNextNode);	
	
	//让线程体眠一会.用这个操作来模拟一个费用操作,并假定这个费用操作花的时间可能不同
	int nRand = GetRandNum0To100() ;
	Sleep(nRand);//休息nRand豪秒
	
	pNode->m_pNextNode = new CNode ;

	SetEvent(g_hEvent);
	
	return 1 ;
}

void CEx090105Dlg::OnTest() 
{	
	Init() ;
	
	//建立uAddNodeCount个线程
	const UINT uAddNodeCount = 10 ;
	HANDLE hThread[uAddNodeCount] ;
	for(int i = 0 ; i < uAddNodeCount ; i++ )
	{
		DWORD dID ;
		hThread[i] = CreateThread(NULL,0,AddTail,NULL,0,&dID); 
	}	
	
	//确保其它线程执行完毕
	DWORD dRet = WaitForMultipleObjects(uAddNodeCount,hThread,TRUE,INFINITE);
	TRACE("等待结束,开始统计节点个数.\n");
	//关闭线程
	for(i = 0 ; i < uAddNodeCount ; i++ )
		CloseHandle(hThread[i]);
	//取得链表子数
	int iCount = GetCount();
	CString strMess ;
	strMess.Format("共有%d个结点\n",iCount);
	TRACE(strMess);
	
	//释放内存
	Release();
}