启动线程失败怎么回事？

[牛牛牛牛牛牛牛牛88]

void CXxxDlg::OnStart()
{
pTest=::AfxBeginThread(ListenTcpThread,this);
// TODO: Add your control notification handler code here

}
error C2065: 'ListenTcpThread' : undeclared identifier
error C2373: 'ListenTcpThread' : redefinition; different type modifiers

但是在ListenTcpThread()里面正常啊，怎么回事？

UINT ListenTcpThread(LPVOID lparam)
{
CXxxDlg *pDlg=(CXxxDlg *)lparam;
pTest=::AfxBeginThread(ListenTcpThread,pDlg);
return 0;
}

[sys0007]

把UINT ListenTcpThread(LPVOID lparam){}放到void CXxxDlg::OnStart() 前面