c++自定义消息完整例子

OnReceive为自定义消息实现的方法

因为线程中无法直接操作控件，以及其他原因，所以需要使用自定义消息来实现这个功能

 自定义消息 #define WM_ENABLEBUTTON WM_USER+100

然后在头文件中增加自定义消息的声明，完整代码如下MfcMultithreadingTcpClientDlg.h

// MfcMultithreadingTcpClientDlg.h : 头文件//#pragma once#include "afxwin.h"class CMfcMultithreadingTcpClientDlg : public CDialog{// 构造public:CMfcMultithreadingTcpClientDlg(CWnd* pParent = NULL);// 标准构造函数// 对话框数据enum { IDD = IDD_MFCMULTITHREADINGTCPCLIENT_DIALOG };protected:virtual void DoDataExchange(CDataExchange* pDX);// DDX/DDV 支持// 实现protected:HICON m_hIcon;// 生成的消息映射函数virtual BOOL OnInitDialog();afx_msg void OnSysCommand(UINT nID, LPARAM lParam);afx_msg void OnPaint();afx_msg HCURSOR OnQueryDragIcon();    //add    afx_msg LRESULT OnReceive(WPARAM wParam,LPARAM lParam);    //addDECLARE_MESSAGE_MAP()public:    afx_msg void OnBnClickedButton1();    // 具体内容框    CListBox m_ListWords;    afx_msg void OnBnClickedButton2();    CEdit m_ShuRuKuang;};

然后在BEGIN_MESSAGE_MAP中添加自定义消息，最后写明调用与实现就好了MfcMultithreadingTcpClientDlg.cpp

// MfcMultithreadingTcpClientDlg.cpp : 实现文件//#include "stdafx.h"#include "MfcMultithreadingTcpClient.h"#include "MfcMultithreadingTcpClientDlg.h"#ifdef _DEBUG#define new DEBUG_NEW#endif#define WM_ENABLEBUTTON WM_USER+100// 用于应用程序“关于”菜单项的 CAboutDlg 对话框class CAboutDlg : public CDialog{public:CAboutDlg();// 对话框数据enum { IDD = IDD_ABOUTBOX };protected:virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持// 实现protected:DECLARE_MESSAGE_MAP()};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD){}void CAboutDlg::DoDataExchange(CDataExchange* pDX){CDialog::DoDataExchange(pDX);}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)END_MESSAGE_MAP()// CMfcMultithreadingTcpClientDlg 对话框CMfcMultithreadingTcpClientDlg::CMfcMultithreadingTcpClientDlg(CWnd* pParent /*=NULL*/): CDialog(CMfcMultithreadingTcpClientDlg::IDD, pParent){m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);}void CMfcMultithreadingTcpClientDlg::DoDataExchange(CDataExchange* pDX){    CDialog::DoDataExchange(pDX);    DDX_Control(pDX, IDC_LIST1, m_ListWords);    DDX_Control(pDX, ShuRuKuang, m_ShuRuKuang);}BEGIN_MESSAGE_MAP(CMfcMultithreadingTcpClientDlg, CDialog)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()//}}AFX_MSG_MAP    ON_MESSAGE(WM_ENABLEBUTTON,OnReceive)    ON_BN_CLICKED(IDC_BUTTON1, &CMfcMultithreadingTcpClientDlg::OnBnClickedButton1)    ON_BN_CLICKED(IDC_BUTTON2, &CMfcMultithreadingTcpClientDlg::OnBnClickedButton2)END_MESSAGE_MAP()LRESULT  CMfcMultithreadingTcpClientDlg::OnReceive (WPARAM wParam,LPARAM lParam){   char *p;          p=(char *)lParam;           CString s(p);  //if(wParam!=NULL)//{//GetDlgItem(btnTagMessage)->EnableWindow(TRUE);    AfxMessageBox("按钮已被启用");     m_ListWords.AddString(s);m_ListWords.SetTopIndex(m_ListWords.GetCount()-1);//}return true;}SOCKET conn;UINT  MTClientThread(LPVOID pParam);CString  GetWord(char *str);BOOL CMfcMultithreadingTcpClientDlg::OnInitDialog(){CDialog::OnInitDialog();// 将“关于...”菜单项添加到系统菜单中。// IDM_ABOUTBOX 必须在系统命令范围内。ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);ASSERT(IDM_ABOUTBOX < 0xF000);CMenu* pSysMenu = GetSystemMenu(FALSE);if (pSysMenu != NULL){BOOL bNameValid;CString strAboutMenu;bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);ASSERT(bNameValid);if (!strAboutMenu.IsEmpty()){pSysMenu->AppendMenu(MF_SEPARATOR);pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);}}// 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动//  执行此操作SetIcon(m_hIcon, TRUE);// 设置大图标SetIcon(m_hIcon, FALSE);// 设置小图标// TODO: 在此添加额外的初始化代码return TRUE;  // 除非将焦点设置到控件，否则返回 TRUE}void CMfcMultithreadingTcpClientDlg::OnSysCommand(UINT nID, LPARAM lParam){if ((nID & 0xFFF0) == IDM_ABOUTBOX){CAboutDlg dlgAbout;dlgAbout.DoModal();}else{CDialog::OnSysCommand(nID, lParam);}}// 如果向对话框添加最小化按钮，则需要下面的代码//  来绘制该图标。对于使用文档/视图模型的 MFC 应用程序，//  这将由框架自动完成。void CMfcMultithreadingTcpClientDlg::OnPaint(){if (IsIconic()){CPaintDC dc(this); // 用于绘制的设备上下文SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);// 使图标在工作区矩形中居中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;// 绘制图标dc.DrawIcon(x, y, m_hIcon);}else{CDialog::OnPaint();}}//当用户拖动最小化窗口时系统调用此函数取得光标//显示。HCURSOR CMfcMultithreadingTcpClientDlg::OnQueryDragIcon(){return static_cast<HCURSOR>(m_hIcon);}void CMfcMultithreadingTcpClientDlg::OnBnClickedButton1(){    // TODO: 在此添加控件通知处理程序代码     AfxBeginThread(MTClientThread,this);   /* while(_getch()!=27)    closesocket(conn);    WSACleanup();*/     m_ListWords.AddString("准备链接服务器，要解决线程中操作控件的问题!");m_ListWords.SetTopIndex(m_ListWords.GetCount()-1);}UINT MTClientThread(LPVOID pParam){const char* servername="127.0.0.1";WSADATA wsaData;struct hostent *hp;unsigned int addr;struct sockaddr_in server;int wsaret=WSAStartup(0x101,&wsaData);if(wsaret)return 0;conn=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);if(conn==INVALID_SOCKET)return 0;//inet_addr是将.分ip转换为十进制数字if(inet_addr(servername)==INADDR_NONE){    hp=gethostbyname(servername);}else{    addr=inet_addr(servername);    hp=gethostbyaddr((char*)&addr,sizeof(addr),AF_INET);}if(hp==NULL){    closesocket(conn);    return 0;}server.sin_addr.s_addr=*((unsigned long*)hp->h_addr);server.sin_family=AF_INET;server.sin_port=htons(20248);if(connect(conn,(struct sockaddr*)&server,sizeof(server))){closesocket(conn);return 0;}char buff[512];int z;z=recv(conn,buff,512,0);buff[z]=0;//CString a=GetWord(buff);//cout << "aaaa" << a;//wcout << LPCTSTR(a);//cout << tmp;//strcpy(buff,"bbbbbbb\r\n");//send(conn,buff,strlen(buff),0);while(true){z=recv(conn,buff,128,0);if(z==SOCKET_ERROR){//cout << "\r\n\r\nsocket error socket error socket error\r\n";break;}            buff[z]=0;::SendMessage (::AfxGetMainWnd()->m_hWnd,WM_ENABLEBUTTON,0,(LPARAM)buff);}   //在这里加自定义消息// ::SendMessage (::AfxGetMainWnd()->m_hWnd,WM_ENABLEBUTTON,0,(LPARAM)a);      // char *ch=NULL;     //  ch="蛋疼"; // ::SendMessage (::AfxGetMainWnd()->m_hWnd,WM_ENABLEBUTTON,0,(LPARAM)buff);    return 0;}CString GetWord(char *str){CString tmp(str); return tmp;}void CMfcMultithreadingTcpClientDlg::OnBnClickedButton2(){    // TODO: 在此添加控件通知处理程序代码、char buff[512];m_ShuRuKuang.GetWindowTextA(buff,512);//   strcpy(buff,"#啦啦啦aaaa\r\n");   send(conn,buff,strlen(buff),0);}