在VC++中实现无标题栏对话框的拖动

　　二、编程步骤

　　1、 启动Visual C++6.0，生成一个基于对话框的应用程序，将该程序命名为"DragMovDlg"；

　　2、 将程序中对话框的Style设置为"PopUp"，Border设置为"None"；

　　3、 使用Class Wizard为对话框添加WM_NCHITTEST消息响应处理函数；

　　4、 添加代码，编译运行程序。
　三、程序代码

/////////////////////////////////////////////// DragMoveDlgDlg.h : header file #if !defined(AFX_DRAGMOVEDLGDLG_H__4E4722C8_DE78_4AEC_97BC_73CEB2B525B3__INCLUDED_) #define AFX_DRAGMOVEDLGDLG_H__4E4722C8_DE78_4AEC_97BC_73CEB2B525B3__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 class CMyDialog : public CDialog { 　// Construction 　public: 　　CMyDialog(CWnd* pParent = NULL); // standard constructor 　　// Dialog Data 　　//{{AFX_DATA(CMyDialog) 　　　enum { IDD = IDD_DRAGMOVEDLG_DIALOG }; 　　　// NOTE: the ClassWizard will add data members here 　　//}}AFX_DATA 　　// ClassWizard generated virtual function overrides 　　//{{AFX_VIRTUAL(CMyDialog) 　protected: 　　virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 　　//}}AFX_VIRTUAL 　　// Implementation 　protected: 　　HICON m_hIcon; 　　// Generated message map functions 　　//{{AFX_MSG(CMyDialog) 　　　virtual BOOL OnInitDialog(); 　　　afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 　　　afx_msg void OnPaint(); 　　　afx_msg HCURSOR OnQueryDragIcon(); 　　//}}AFX_MSG 　　afx_msg UINT OnNcHitTest(CPoint pt); 　　DECLARE_MESSAGE_MAP() }; //{{AFX_INSERT_LOCATION}} // Microsoft Visual C++ will insert additional declarations immediately before the previous line. #endif // !defined(AFX_DRAGMOVEDLGDLG_H__4E4722C8_DE78_4AEC_97BC_73CEB2B525B3__INCLUDED_) //////////////////////////////////////////////////////////////////////// DragMoveDlgDlg.cpp : implementation file #include "stdafx.h" #include "DragMoveDlg.h" #include "DragMoveDlgDlg.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif CMyDialog::CMyDialog(CWnd* pParent /*=NULL*/) : CDialog(CMyDialog::IDD, pParent) { 　//{{AFX_DATA_INIT(CMyDialog) 　　// 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 CMyDialog::DoDataExchange(CDataExchange* pDX) { 　CDialog::DoDataExchange(pDX); 　//{{AFX_DATA_MAP(CMyDialog) 　　// NOTE: the ClassWizard will add DDX and DDV calls here 　//}}AFX_DATA_MAP } BEGIN_MESSAGE_MAP(CMyDialog, CDialog) 　//{{AFX_MSG_MAP(CMyDialog) 　　　ON_WM_SYSCOMMAND() 　　　ON_BN_CLICKED(ID_APP_ABOUT,OnAbout) 　　　ON_WM_PAINT() 　　　ON_WM_QUERYDRAGICON() 　//}}AFX_MSG_MAP 　ON_WM_NCHITTEST() END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CMyDialog message handlers BOOL CMyDialog::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 CMyDialog::OnSysCommand(UINT nID, LPARAM lParam) { 　if ((nID & 0xFFF0) == IDM_ABOUTBOX) 　{} 　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 CMyDialog::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 CMyDialog::OnQueryDragIcon() { 　return (HCURSOR) m_hIcon; } void CMyDialog::OnAbout() { 　CAboutDlg().DoModal(); } ////////////////// // Non-client hit-test handler to move window by its client area. // If the user clicks anywhere on the client area, pretend it's the // caption. Windows does the rest! UINT CMyDialog::OnNcHitTest(CPoint pt) { 　CRect rc; 　GetClientRect(&rc); 　ClientToScreen(&rc); 　return rc.PtInRect(pt) ? HTCAPTION : CDialog::OnNcHitTest(pt); }

　　
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