步驟：
1）給Edit控件添加變量: m_FilePath;
2) 給Button的Click添加相應函數：
void CInDlgDlg::OnButton2()
{
char szFilters[]=
"MyType Files (*.my)|*.my|All Files (*.*)|*.*||";
// Create an Open dialog; the default file name extension is ".my".
CFileDialog fileDlg (TRUE, "my", "*.my",
OFN_FILEMUSTEXIST| OFN_HIDEREADONLY, szFilters, this);
// Display the file dialog. When user clicks OK, fileDlg.DoModal()
// returns IDOK.
if( fileDlg.DoModal()==IDOK )
{
CString pathName = fileDlg.GetPathName();
m_FilePath = pathName;
UpdateData(FALSE);
}
}