CFtpConnection.SetCurrentDirectory(path)怎么不能转换ftp路径

大家好！
我做了个简单的ftp上传，上传到AIX ftp server上，我一开始用的是test:test帐号不能转换当前目录，、
后来用了root帐号就可以，但是我用FLASHFXP可以直接用test帐号，访问到指定目录如“/app/bc”,麻烦大家帮忙解决！


代码：
CInternetSession* pSession;
CFtpConnection* pConnection=NULL;
pSession = new CInternetSession;
pConnection = pSession->GetFtpConnection(sServerIP,sUserName,sUserPass);//建立FTP连接，host,username,password都是CString类型

if (pConnection) //当连接上时开始处理
{
CString path;
path = ".//app//bc//input//";
if (pConnection->SetCurrentDirectory(path) == 0)//转换FTP到指定目录
{
这时用test转换不了
pConnection->Close();
delete pConnection;
return FALSE;

}

// pConnection->Command("dsd",CmdRespNone,FTP_TRANSFER_TYPE_BINARY,2,1);
if (pConnection->PutFile(sDirc,sFull,FTP_TRANSFER_TYPE_BINARY,1) == 0 )
{
m_Error = GetLastError();
pConnection->Close();
delete pConnection;
return FALSE;

}
// pConnection->PutFile(
if (pConnection != NULL)
{
pConnection->Close();
delete pConnection;
}

return TRUE;
}
等待中啊