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A list of the COMDLG32 classes is shown in the following table.

Class	Purpose
CColorDialog	Allows the user to select or create a color
CFileDialog	Allows the user to open or save a file
CFindReplaceDialog	Allows the user to substitute one string for another
CPageSetupDialog	Allows the user to input page measurement parameters
CFontDialog	Allows the user to select a font from a list of available fonts
CPrintDialog	Allows the user to set up the printer and print a document

Using the CFileDialog Class Directly

CFileDialog dlg(TRUE, "bmp", "*.bmp");
if (dlg.DoModal() == IDOK) {
    CFile file;
    VERIFY(file.Open(dlg.GetPathName(), CFile::modeRead));
}

The first constructor parameter (TRUE) specifies that this object is a "File Open" dialog instead of a "File Save" dialog. The default file extension is bmp, and *.bmp appears first in the filename edit box. The CFileDialog::GetPathName function returns a CString object that contains the full pathname of the selected file.

Nested Dialogs

Check your work by choosing Resource Symbols from the Visual C++ View menu. You should see a symbol list like the one shown in the graphic below.
在View菜单下面检查一下资源的ID是否正确。

3.Use ClassWizard to create the CSpecialFileDialog class. Fill in the New Class dialog, as shown here, and then click the Change button.
用向导生成类CSpecialFileDialog，Change the names to SpecFileDlg.h and SpecFileDlg.cpp.

Unfortunately, we cannot use the Base Class drop-down list to change the base class to CFileDialog, as that would decouple our class from the IDD_FILESPECIAL template. We have to change the base class by hand.

BOOL bRet = CFileDialog::OnInitDialog();
if (bRet == TRUE) {
    GetParent()->GetDlgItem(IDOK)->SetWindowText("Delete");
}
return bRet;

 void CSpecialFileDialog::OnDelete() 
{
    m_bDeleteAll = TRUE;
    // 0x480 is the child window ID of the File Name edit control
    //  (as determined by SPYXX)
    GetParent()->GetDlgItem(0x480)->GetWindowText(m_strFilename);
    GetParent()->SendMessage(WM_COMMAND, IDCANCEL);
}

2)Add the following two public data members:

CString m_strFilename;
BOOL m_bDeleteAll;

CSpecialFileDialog(BOOL bOpenFileDialog, 
    LPCTSTR lpszDefExt = NULL,
    LPCTSTR lpszFileName = NULL,
    DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
    LPCTSTR lpszFilter = NULL,
    CWnd* pParentWnd = NULL
);

7.Edit the CSpecialFileDialog constructor in SpecFileDlg.cpp. 

CSpecialFileDialog::CSpecialFileDialog(BOOL bOpenFileDialog,
        LPCTSTR lpszDefExt, LPCTSTR lpszFileName, DWORD dwFlags,
        LPCTSTR lpszFilter, CWnd* pParentWnd)
    : CFileDialog(bOpenFileDialog, lpszDefExt, lpszFileName,
        dwFlags, lpszFilter, pParentWnd)
{
    //{{AFX_DATA_INIT(CSpecialFileDialog)
        // NOTE: the ClassWizard will add member initialization here
    //}}AFX_DATA_INIT
    m_ofn.Flags |= OFN_ENABLETEMPLATE;
    m_ofn.lpTemplateName = MAKEINTRESOURCE(IDD_FILESPECIAL);
    m_ofn.lpstrTitle = "Delete File";
    m_bDeleteAll = FALSE;
}


In addition, it must set some members of the CFileDialog base class data 
member m_ofn, which is an instance of the Win32 OPENFILENAME 
structure. The Flags and lpTemplateName members control the 
coupling to your IDD_FILESPECIAL template, and the lpstrTitle 
member changes the main dialog box title.

8.Replace CDialog with CFileDialog in SpecFileDlg.h And SpecFileDlg.cpp

9.Add code to the virtual OnDraw function in file ex07bView.cpp. The 
CEx07bView OnDraw function (whose skeleton was generated by AppWizard) 
should be coded as follows to prompt the user to press the mouse button: 

10.Add the OnLButtonDown message handler to the CEx07bView class. Use ClassWizard to create the message handler for WM_LBUTTON-DOWN, and then edit the code as follows: 

void CEx07bView::OnLButtonDown(UINT nFlags, CPoint point) 
{
    CSpecialFileDialog dlgFile(TRUE, NULL, "*.obj");
    CString strMessage;
    int nModal = dlgFile.DoModal();
    if ((nModal == IDCANCEL) && (dlgFile.m_bDeleteAll)) {
        strMessage.Format(
            "Are you sure you want to delete all %s files?",
            dlgFile.m_strFilename);
        if (AfxMessageBox(strMessage, MB_YESNO) == IDYES) {
            HANDLE h;
            WIN32_FIND_DATA fData;
            while((h = ::FindFirstFile(dlgFile.m_strFilename, &fData))
                    != (HANDLE) 0xFFFFFFFF) { // no MFC equivalent
                if (::DeleteFile(fData.cFileName) == FALSE) {
                    strMessage.Format("Unable to delete file %s\n",
                        fData.cFileName);
                    AfxMessageBox(strMessage);
                    break;
                }
            }
        }
    }
    else if (nModal == IDOK) {
        CString strSingleFilename = dlgFile.GetPathName();
        strMessage.Format(
            "Are you sure you want to delete %s?", strSingleFilename);
        if (AfxMessageBox(strMessage, MB_YESNO) == IDYES) {
            CFile::Remove(strSingleFilename);
        }
    }
}

11.Of course, you'll need to include the statement