批量修改文件夹下的子文件夹名字不行,该怎么解决

void CCopyFileDlg::RenameFile()
{
    UpdateData();
    CTime dntm;
    dntm=CTime::GetCurrentTime();
    CString time = dntm.Format("%Y%m%d");

    CFileFind finder; 
    CString NewFileName,str,FileExtend,FileName,FileRoot="";
    BOOL bWorking = finder.FindFile(m_SourcePath+"\\*.*"); 
    EnablePathName(m_OldFileName);
    while(bWorking)     
    { 
        bWorking=finder.FindNextFile(); 
        if (finder.IsDots()) 
            continue; 
        m_OldFileName=finder.GetFilePath(); 
        FileName=finder.GetFileName();
        m_Num++;
        str.Format("%d%d%d",m_Num/100,m_Num/10,m_Num%10);
        for (int i=0;i<FileName.GetLength();i++)
        {
            if(FileName[i]=='.')break;
        }
        FileExtend=FileName.Right(FileName.GetLength()-i);
        m_NewFileName = FileName+time;
        CFile::Rename(m_OldFileName,m_NewFileName);
    } 
    UpdateData(FALSE);
}

void CCopyFileDlg::EnablePathName(CString &FileName)
{
    CString str1,str2;
    for (int i=0;i<FileName.GetLength();i++)
    {
        if (FileName[i]=='\\')
        {
            str1=FileName.Left(i);
            str2=FileName.Right(FileName.GetLength()-i);
            str1+="\\";
            FileName=str1+str2;
            i++;
        }
    }
    return;
}