10，嵌套对话框（这些内容熔入EX07B事例中讲解了，不打算重复，强烈建议看看和跟着做做，页码：P135-141。下面只对其中重要的函数做些说明笔记。）
利用MFC，从通用
1）CFileDialog::m_ofn
//m_ofn is a structure of type OPENFILENAME. Use this structure to initialize the appearance of a File Open or File Save As dialog box after it is constructed but before it is displayed with the DoModal member function.
2）CFileDialog::CFileDialog
CFileDialog( BOOL bOpenFileDialog, LPCTSTR lpszDefExt = NULL, LPCTSTR lpszFileName = NULL, DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, LPCTSTR lpszFilter = NULL, CWnd* pParentWnd = NULL );
//bOpenFileDialog
Set to TRUE to construct a File Open dialog box or FALSE to construct a File Save As dialog box.
3）CFileDialog::DoModal
//Call this function to display the Windows common file dialog box and allow the user to browse files and directories and enter a filename.
//If you want to initialize the various file dialog-box options by setting members of the m_ofn structure, you should do this before calling DoModal, but after the dialog object is constructed.
//When the user clicks the dialog box’s OK or Cancel buttons, or selects the Close option from the dialog box’s control menu, control is returned to your application. You can then call other member functions to retrieve the settings or information the user inputs into the dialog box.
4）CFileDialog::GetPathName
//Call this function to retrieve the full path of the file entered in the dialog box. The path of the filename includes the file’s title plus the entire directory path.
5）事例中注意设置自己创建的子对话框上的组筐控件的ID为stc32。这样才保证文件通用对话框嵌入的位置在组筐所在的位置上，否则默认为自己创建的子对话框的同宽度。（stc32应该是与文件通用对话框相关联的，具体是如何关联的哦？）
6）事例中可见到这样的代码（GetParent()->GetDlgItem(IDOK)->SetWindowText("Delete");）来获取文件通用对话框上的控件指针，这里要理解为什么要用GetParent()函数来获得父窗口指针（因为事例中自己所创建的对话框被设置成Child Style。）（Child style,None border,Group box ID=stc32这些设置都是必不可少的，自己可以试着改变这些设置，看看效果印象也就深了）
7）事例中CSpecialFileDialog::OnDelete() 函数中代码（GetParent()->GetDlgItem(0x480)->GetWindowText(m_strFileName);）通过获取文件通用对话框上文件名对应的编辑框的指针调用CWnd::GetWindowText函数来获取编辑框中的文本保存在m_strFileName数据成员中。其中0x480应该是文件通用对话框上文件名对应的编辑框的ID。
8）事例中CSpecialFileDialog::OnDelete() 函数中代码（GetParent()->SendMessage(WM_COMMAND,IDCANCEL);）向文件通用对话框发送IDCANCEL消息，该操作引起OnCancel函数的调用终止当前模式对话框同时使得CFileDialog::DoModal函数返回IDCANCEL值。
MSDN：
CDialog::OnCancel （The default simply terminates a modal dialog box by calling EndDialog and causing DoModal to return IDCANCEL.）
9）SDK函数：FindFirstFile，DeleteFile
//FindFirstFile Searches a directory for a file whose name matches the specified file name on the destination site identified by this object. It examines subdirectory names as well as file names.
//DeleteFile Deletes the given file from the destination site.
10）CFile::Remove
A static function ，deletes the file specified by the path. It will not remove a directory. （注意：用这函数删除的文件是不经过回收站的哦。）
11，在对话框标题栏添加图标：在对话框类OnInitDialog函数中添加如下代码。
HICON hIcon =AfxGetApp()->LoadIcon(ID_MYICON);//ID_MYICON是用资源编辑器创建的图标ID。
this->SetIcon(hIcon,TRUE);
this->SetIcon(hIcon,FALSE);注：这里带上this指针目的是为了强调必须使用目的对话框类对象指针调用SetIcon设置图标。
比如在书EX07B事例中，由于CSpecialFileDialog类设置为子窗口类，而且所关联的资源窗口没有Tittle Bar，要在父窗口文件通用对话框Tittle Bar上添加图标，必须获取父窗口文件通用对话框对象指针来调用SetIcon设置图标。
如在书EX07B事例中：在CSpecialFileDialog::OnInitDialog函数中添加如下代码，可设置文件通用对话框标题图标：
HICON hIcon =AfxGetApp()->LoadIcon(ID_MYICON);
GetParent()->SetIcon(hIcon,TRUE);
GetParent()->SetIcon(hIcon,FALSE);
