关于用jmail发送带附件的邮件时不能打开附件路径

Question

jmail::IMessagePtr pMessage("JMail.Message");
pMessage->MailServerUserName=(LPCTSTR)m_strUserName;
pMessage->MailServerPassWord=(LPCTSTR)m_strPassWord;
pMessage->From=(LPCTSTR)m_strUserName;
pMessage->FromName="yang";
for(int k=0;k<m_list2.GetItemCount();k++)
{
    pMessage->AddRecipient((LPCTSTR)m_list2.GetItemText(k,2),"","");
}
for(int i=0;i<m_list1.GetCount();i++)
{
CString str;
str=m_list1.GetText(i,str.GetBuffer(str.GetLength()));
    pMessage->AddAttachment((LPCTSTR)str,VARIANT_FALSE,"");
}//这个循坏用于从我的listbox中读取附件路径，编译没问题，发送时提示路径打不开，附件不能添加，望高手指教！多谢！
pMessage->Subject = (LPCTSTR)m_strSubject;
pMessage->Body = (LPCTSTR)m_strBody;
pMessage->Send((LPCTSTR)m_strMailServer, VARIANT_FALSE);
                pMessage->Release();
AfxMessageBox("发送成功!");