threadsampledlg.cpp

随着计算机信息技术的飞速发展

// ThreadSampleDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ThreadSample.h"
#include "ThreadSampleDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define MESSAGEFROMTHREAD	(WM_USER+1001)
#define STARTTHREAD			(WM_USER+1002)
#define STOPTHREAD			(WM_USER+1003)
UINT Thread_Fun(void* hWnd);

static	CRITICAL_SECTION	cs;
/////////////////////////////////////////////////////////////////////////////
// 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()

/////////////////////////////////////////////////////////////////////////////
// CThreadSampleDlg dialog

CThreadSampleDlg::CThreadSampleDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CThreadSampleDlg::IDD, pParent)
{
	m_ThreadID=0;
	//{{AFX_DATA_INIT(CThreadSampleDlg)
	m_sData1 = _T("String");
	m_iData2 = -1000;
	m_dData3 = -100.000;
	m_edit1 = _T("");
	m_edit2 = 0;
	m_edit3 = 0.0;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CThreadSampleDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CThreadSampleDlg)
	DDX_Text(pDX, IDC_EDIT1, m_sData1);
	DDX_Text(pDX, IDC_EDIT2, m_iData2);
	DDX_Text(pDX, IDC_EDIT3, m_dData3);
	DDX_Text(pDX, IDC_EDIT4, m_edit1);
	DDX_Text(pDX, IDC_EDIT5, m_edit2);
	DDX_Text(pDX, IDC_EDIT6, m_edit3);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CThreadSampleDlg, CDialog)
	//{{AFX_MSG_MAP(CThreadSampleDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_MESSAGE(MESSAGEFROMTHREAD,OnMessageFromThread)
	ON_WM_CLOSE()
	ON_BN_CLICKED(IDOK, OnStart)
	ON_BN_CLICKED(IDCANCEL, OnStop)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CThreadSampleDlg message handlers

void CThreadSampleDlg::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 CThreadSampleDlg::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();
	}
}

void CThreadSampleDlg::OnClose() 
{
	::PostThreadMessage(m_ThreadID, WM_QUIT, 0, 0);//退出线程
	::DeleteCriticalSection(&cs);//删除临界区
	EndDialog(IDCANCEL);//关闭对话框
}

HCURSOR CThreadSampleDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

BOOL CThreadSampleDlg::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);
		}
	}
	//创建从线程
	m_hThread  = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Thread_Fun, (LPVOID)this->m_hWnd, NULL, &m_ThreadID);
	if ((m_hThread == NULL))//无法创建从线程
	{   
		MessageBox("从线程创建失败！", NULL, NULL);
		exit(-1);
	}
	::InitializeCriticalSection(&cs);//
	// 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
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CThreadSampleDlg::OnMessageFromThread(WPARAM wParam, LPARAM lParam)
{
	//主线程从MESSAGEFROMTHREAD消息的参数中提取经过处理的数据
	m_edit1 = ( (THREADDATA*)wParam )->sData1;
	m_edit2 = ( (THREADDATA*)wParam )->iData2;
	m_edit3 = ( (THREADDATA*)wParam )->dData3;
	UpdateData(false);//实时更新显示经过处理的数据
}

void CThreadSampleDlg::OnStart()//给线程发启动消息，传送其需要的数据，并使其启动数据处理过程 
{
	UpdateData(true);
	GetDlgItem(IDCANCEL)->EnableWindow(true);
	GetDlgItem(IDOK)->EnableWindow(false);
	m_Data.sData1=m_sData1;
	m_Data.iData2=m_iData2;
	m_Data.dData3=m_dData3;
	::PostThreadMessage(m_ThreadID, STARTTHREAD,  (WPARAM) &m_Data,  0);
}

void CThreadSampleDlg::OnStop() //给线程发暂停消息，使其暂停数据处理过程
{
	GetDlgItem(IDCANCEL)->EnableWindow(false);
	GetDlgItem(IDOK)->EnableWindow(true);
	::PostThreadMessage(m_ThreadID, STOPTHREAD, 0, 0);
}

UINT Thread_Fun(void* hWnd)
{
	bool b_run_or_stop = false;//是否启动数据处理
	THREADDATA thread_data;//线程要处理的数据
	MSG msg;//线程的消息
	while(1)
	{
		if(b_run_or_stop)//如果启动数据处理
		{
			EnterCriticalSection(&cs);//进入临界区
			thread_data.sData1.MakeReverse();//处理数据
			thread_data.iData2++;//本例只是对数据进行简单处理
			thread_data.dData3+=0.2;//其原理同样适于复杂的数据处理过程
			LeaveCriticalSection(&cs);//离开临界区
			::PostMessage((HWND) hWnd, MESSAGEFROMTHREAD, (WPARAM) &thread_data, (LPARAM) 0 );//数据处理完毕，通知主线程
		}
		//消息控制线程
		if(::PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
		{
			switch(msg.message)
			{
			case WM_QUIT:
				ExitThread(10);
			case STARTTHREAD://启动数据处理,从线程从消息中提取其将要处理的数据
				thread_data.sData1 = ( (THREADDATA*) msg.wParam )->sData1;
				thread_data.iData2 = ( (THREADDATA*) msg.wParam )->iData2;
				thread_data.dData3 = ( (THREADDATA*) msg.wParam )->dData3;
				b_run_or_stop = true;
				break;
			case STOPTHREAD://暂停数据处理
				b_run_or_stop = false;
				break;
			default:
				break;
			}
		}
	}
	return 0;
}