c++ mfc ON_MESSAGE使用实验

代码分析（源码）

代码摘要

//声明
1.
#define WM_MYMSG  WM_USER+200
2.
DECLARE_MESSAGE_MAP()
3.
RESULT OnMyMsgHandler(WPARAM w,LPARAM l);
//定义
1.
BEGIN_MESSAGE_MAP(CON_MESSAGE_testDlg, CDialog)
	//{{AFX_MSG_MAP(CON_MESSAGE_testDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	//}}AFX_MSG_MAP
ON_MESSAGE(WM_MYMSG,OnMyMsgHandler)
END_MESSAGE_MAP()
2.
LRESULT CON_MESSAGE_testDlg::OnMyMsgHandler(WPARAM w,LPARAM l)
{
	AfxMessageBox("Hello,World!");
	return 0;
}
3.
void CON_MESSAGE_testDlg::OnButton1() 
{
	// TODO: Add your control notification handler code here
	//::SendMessge(::AfxGetMainWnd()->m_hWnd,WM_MYMSG,0,0);
	::PostMessage(::AfxGetMainWnd()->m_hWnd,WM_MYMSG,0,0);
}

运行结果 

代码

// ON_MESSAGE_testDlg.h : header file
//

#if !defined(AFX_ON_MESSAGE_TESTDLG_H__B8379676_2F5B_48DD_9E95_41A4CD01E951__INCLUDED_)
#define AFX_ON_MESSAGE_TESTDLG_H__B8379676_2F5B_48DD_9E95_41A4CD01E951__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#define WM_MYMSG  WM_USER+200
//DECLARE_MESSAGE_MAP();
//afx_msg LRESULT MyMsgHandler(WPARAM,LPARAM);


/////////////////////////////////////////////////////////////////////////////
// CON_MESSAGE_testDlg dialog

class CON_MESSAGE_testDlg : public CDialog
{
// Construction
public:
	CON_MESSAGE_testDlg(CWnd* pParent = NULL);	// standard constructor
	LRESULT CON_MESSAGE_testDlg::OnMyMsgHandler(WPARAM w,LPARAM l);

// Dialog Data
	//{{AFX_DATA(CON_MESSAGE_testDlg)
	enum { IDD = IDD_ON_MESSAGE_TEST_DIALOG };
		// NOTE: the ClassWizard will add data members here
	//}}AFX_DATA

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

// Implementation
protected:
	HICON m_hIcon;

	// Generated message map functions
	//{{AFX_MSG(CON_MESSAGE_testDlg)
	virtual BOOL OnInitDialog();
	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	afx_msg void OnButton1();
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_ON_MESSAGE_TESTDLG_H__B8379676_2F5B_48DD_9E95_41A4CD01E951__INCLUDED_)

// ON_MESSAGE_testDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ON_MESSAGE_test.h"
#include "ON_MESSAGE_testDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CON_MESSAGE_testDlg dialog

CON_MESSAGE_testDlg::CON_MESSAGE_testDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CON_MESSAGE_testDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CON_MESSAGE_testDlg)
		// 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 CON_MESSAGE_testDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CON_MESSAGE_testDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CON_MESSAGE_testDlg, CDialog)
	//{{AFX_MSG_MAP(CON_MESSAGE_testDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	//}}AFX_MSG_MAP
ON_MESSAGE(WM_MYMSG,OnMyMsgHandler)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CON_MESSAGE_testDlg message handlers

BOOL CON_MESSAGE_testDlg::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 CON_MESSAGE_testDlg::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 CON_MESSAGE_testDlg::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 CON_MESSAGE_testDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CON_MESSAGE_testDlg::OnButton1() 
{
	// TODO: Add your control notification handler code here
	//::SendMessge(::AfxGetMainWnd()->m_hWnd,WM_MYMSG,0,0);
	::PostMessage(::AfxGetMainWnd()->m_hWnd,WM_MYMSG,0,0);
}


LRESULT CON_MESSAGE_testDlg::OnMyMsgHandler(WPARAM w,LPARAM l)

{
	AfxMessageBox("Hello,World!");
	return 0;
}