圆形对话框

下面的代码是用来创建 圆形对话框。

在对话框初始化代码中添加或者其它启动阶段添加。

BOOL CTestRoundDialogDlg::OnInitDialog()
{
	CDialogEx::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)
	{
		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);
		}
	}

	// 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
	CRgn rgn;
	rgn.CreateRectRgn(0,0,400,400); //画出方框
	CRgn rox;
	rox.CreateEllipticRgn(0,0,400,400);//画出圆形
	rox.CombineRgn(&rgn,&rox,RGN_AND);//两个区域重叠，其中第三个参数是负责划分两个区域的合并关系。有RGn_Copy、Rgn_diff等。
	rgn.DeleteObject();//删除方框的object
	SetWindowRgn((HRGN)rox, TRUE);//设置窗口为这个rox。
	return TRUE;  // return TRUE  unless you set the focus to a control
}