通过线程传递消息

今天讲一下线程如何向对话框传递消息，步骤如下：

1. 创建消息数,在xxDlg.h: #define WM_RESPONSE WM_USER+1 
2. 声明消息函数成员函数xxDlg.h: afx_msg LRESULT winMessageFun(WPARAM wParam, LPARAM lParam); （注意返回值类型为LRESULT,在VC里可以是void 类，但在vs内会提示不兼容，只能用LRESULT）
3. 添加消息映像xxDlg.cpp: ON_MESSAGE(WM_RESPONSE,winMessageFun) 
4. 定义消息响应函数xxxDlg.cpp:

   LRESULT CMFCApplicationThresdDlg::winMessageFun(WPARAM wParam, LPARAM lParam)
   {
       UNREFERENCED_PARAMETER(wParam);
       UNREFERENCED_PARAMETER(lParam);
       WORD value = lParam;
       CString str;
       str.Format(_T("%d\r\n"), value);
       m_edit1 += str;
       UpdateData(FALSE);
       return 0;
   }

    

5. 定义线程传递参数结构体

   1 struct ThreadParam
   2 {
   3     HWND ThreadID;
   4     WORD ThreadVal;
   5 };

    

6. 创建线程，在点击按键后启动线程：

   1 void CMFCApplicationThresdDlg::Btn_Clicked_Start()
   2 {
   3     // TODO: Add your control notification handler code here
   4     ThreadParam *pRecvParam = new ThreadParam;
   5     pRecvParam->ThreadVal = 0;
   6     pRecvParam->ThreadID = m_hWnd;
   7     //create thread
   8     HANDLE hThread = CreateThread(NULL, 0, ThreadProc, (LPVOID)pRecvParam, 0, NULL);
   9 }

    

7. 声明线程函数xxDlg.h: 

   1 private:
   2     static DWORD WINAPI ThreadProc(LPVOID lpParameter);

8. 定义线程函数：

    1 DWORD CMFCApplicationThresdDlg::ThreadProc(LPVOID lpParameter)
    2 {
    3     WORD value = ((ThreadParam*)lpParameter)->ThreadVal;
    4     HWND hwnd = ((ThreadParam*)lpParameter)->ThreadID;
    5     while (1)
    6     {
    7         value++;
    8         ::PostMessage(hwnd, WM_RESPONSE, 0, (LPARAM)value);
    9         Sleep(1000);
   10     }
   11     return 0;
   12 }

    

9. 源码：
   

     1 // MFCApplicationThresdDlg.cpp : implementation file
     2 //
     3 
     4 #include "stdafx.h"
     5 #include "MFCApplicationThresd.h"
     6 #include "MFCApplicationThresdDlg.h"
     7 #include "afxdialogex.h"
     8 
     9 #ifdef _DEBUG
    10 #define new DEBUG_NEW
    11 #endif
    12 
    13 
    14 // CAboutDlg dialog used for App About
    15 
    16 class CAboutDlg : public CDialogEx
    17 {
    18 public:
    19     CAboutDlg();
    20 
    21 // Dialog Data
    22     enum { IDD = IDD_ABOUTBOX };
    23 
    24     protected:
    25     virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
    26 
    27 // Implementation
    28 protected:
    29     DECLARE_MESSAGE_MAP()
    30 };
    31 
    32 CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
    33 {
    34 }
    35 
    36 void CAboutDlg::DoDataExchange(CDataExchange* pDX)
    37 {
    38     CDialogEx::DoDataExchange(pDX);
    39 }
    40 
    41 BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
    42 END_MESSAGE_MAP()
    43 
    44 
    45 // CMFCApplicationThresdDlg dialog
    46 
    47 
    48 
    49 CMFCApplicationThresdDlg::CMFCApplicationThresdDlg(CWnd* pParent /*=NULL*/)
    50     : CDialogEx(CMFCApplicationThresdDlg::IDD, pParent)
    51     , m_edit1(_T(""))
    52 {
    53     m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
    54 }
    55 
    56 void CMFCApplicationThresdDlg::DoDataExchange(CDataExchange* pDX)
    57 {
    58     CDialogEx::DoDataExchange(pDX);
    59     DDX_Text(pDX, IDC_EDIT1, m_edit1);
    60 }
    61 
    62 BEGIN_MESSAGE_MAP(CMFCApplicationThresdDlg, CDialogEx)
    63     ON_WM_SYSCOMMAND()
    64     ON_WM_PAINT()
    65     ON_WM_QUERYDRAGICON()
    66     ON_BN_CLICKED(IDC_BUTTON1, &CMFCApplicationThresdDlg::Btn_Clicked_Start)
    67     ON_MESSAGE(WM_RESPONSE,winMessageFun)
    68 END_MESSAGE_MAP()
    69 
    70 
    71 // CMFCApplicationThresdDlg message handlers
    72 
    73 BOOL CMFCApplicationThresdDlg::OnInitDialog()
    74 {
    75     CDialogEx::OnInitDialog();
    76 
    77     // Add "About..." menu item to system menu.
    78 
    79     // IDM_ABOUTBOX must be in the system command range.
    80     ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
    81     ASSERT(IDM_ABOUTBOX < 0xF000);
    82 
    83     CMenu* pSysMenu = GetSystemMenu(FALSE);
    84     if (pSysMenu != NULL)
    85     {
    86         BOOL bNameValid;
    87         CString strAboutMenu;
    88         bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
    89         ASSERT(bNameValid);
    90         if (!strAboutMenu.IsEmpty())
    91         {
    92             pSysMenu->AppendMenu(MF_SEPARATOR);
    93             pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
    94         }
    95     }
    96 
    97     // Set the icon for this dialog.  The framework does this automatically
    98     //  when the application's main window is not a dialog
    99     SetIcon(m_hIcon, TRUE);            // Set big icon
   100     SetIcon(m_hIcon, FALSE);        // Set small icon
   101 
   102     // TODO: Add extra initialization here
   103 
   104     return TRUE;  // return TRUE  unless you set the focus to a control
   105 }
   106 
   107 void CMFCApplicationThresdDlg::OnSysCommand(UINT nID, LPARAM lParam)
   108 {
   109     if ((nID & 0xFFF0) == IDM_ABOUTBOX)
   110     {
   111         CAboutDlg dlgAbout;
   112         dlgAbout.DoModal();
   113     }
   114     else
   115     {
   116         CDialogEx::OnSysCommand(nID, lParam);
   117     }
   118 }
   119 
   120 // If you add a minimize button to your dialog, you will need the code below
   121 //  to draw the icon.  For MFC applications using the document/view model,
   122 //  this is automatically done for you by the framework.
   123 
   124 void CMFCApplicationThresdDlg::OnPaint()
   125 {
   126     if (IsIconic())
   127     {
   128         CPaintDC dc(this); // device context for painting
   129 
   130         SendMessage(WM_ICONERASEBKGND, reinterpret_cast(dc.GetSafeHdc()), 0);
   131 
   132         // Center icon in client rectangle
   133         int cxIcon = GetSystemMetrics(SM_CXICON);
   134         int cyIcon = GetSystemMetrics(SM_CYICON);
   135         CRect rect;
   136         GetClientRect(&rect);
   137         int x = (rect.Width() - cxIcon + 1) / 2;
   138         int y = (rect.Height() - cyIcon + 1) / 2;
   139 
   140         // Draw the icon
   141         dc.DrawIcon(x, y, m_hIcon);
   142     }
   143     else
   144     {
   145         CDialogEx::OnPaint();
   146     }
   147 }
   148 
   149 // The system calls this function to obtain the cursor to display while the user drags
   150 //  the minimized window.
   151 HCURSOR CMFCApplicationThresdDlg::OnQueryDragIcon()
   152 {
   153     return static_cast(m_hIcon);
   154 }
   155 
   156 
   157 
   158 void CMFCApplicationThresdDlg::Btn_Clicked_Start()
   159 {
   160     // TODO: Add your control notification handler code here
   161     ThreadParam *pRecvParam = new ThreadParam;
   162     pRecvParam->ThreadVal = 0;
   163     pRecvParam->ThreadID = m_hWnd;
   164     //create thread
   165     HANDLE hThread = CreateThread(NULL, 0, ThreadProc, (LPVOID)pRecvParam, 0, NULL);
   166 }
   167 DWORD CMFCApplicationThresdDlg::ThreadProc(LPVOID lpParameter)
   168 {
   169     WORD value = ((ThreadParam*)lpParameter)->ThreadVal;
   170     HWND hwnd = ((ThreadParam*)lpParameter)->ThreadID;
   171     while (1)
   172     {
   173         value++;
   174         ::PostMessage(hwnd, WM_RESPONSE, 0, (LPARAM)value);
   175         Sleep(1000);
   176     }
   177     return 0;
   178 }
   179 LRESULT CMFCApplicationThresdDlg::winMessageFun(WPARAM wParam, LPARAM lParam)
   180 {
   181     UNREFERENCED_PARAMETER(wParam);
   182     UNREFERENCED_PARAMETER(lParam);
   183     WORD value = lParam;
   184     CString str;
   185     str.Format(_T("%d\r\n"), value);
   186     m_edit1 += str;
   187     UpdateData(FALSE);
   188     return 0;
   189 }

   CMFCApplicationThresdDlg.cpp
   

    1 // MFCApplicationThresdDlg.h : header file
    2 //
    3 
    4 #pragma once
    5 
    6 
    7 // CMFCApplicationThresdDlg dialog
    8 #define WM_RESPONSE    WM_USER+1
    9 struct ThreadParam
   10 {
   11     HWND ThreadID;
   12     WORD ThreadVal;
   13 };
   14 class CMFCApplicationThresdDlg : public CDialogEx
   15 {
   16 // Construction
   17 public:
   18     CMFCApplicationThresdDlg(CWnd* pParent = NULL);    // standard constructor
   19 
   20 // Dialog Data
   21     enum { IDD = IDD_MFCAPPLICATIONTHRESD_DIALOG };
   22 private:
   23     static DWORD WINAPI ThreadProc(LPVOID lpParameter);
   24 
   25     protected:
   26     virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
   27 
   28 
   29 // Implementation
   30 protected:
   31     HICON m_hIcon;
   32 
   33     // Generated message map functions
   34     virtual BOOL OnInitDialog();
   35     afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
   36     afx_msg void OnPaint();
   37     afx_msg HCURSOR OnQueryDragIcon();
   38     afx_msg LRESULT winMessageFun(WPARAM wParam, LPARAM lParam);
   39     DECLARE_MESSAGE_MAP()
   40 public:
   41     CString m_edit1;
   42     afx_msg void Btn_Clicked_Start();
   43 };

   CMFCApplicationThresdDlg.h

    

谢谢！

End.