VC++6.0 访问SAP的接口代码，在调用函数进行链接的过程中出现问题

RFC_RC rc = RFC_OK;
RFC_CONNECTION_PARAMETER loginParams[5];
RFC_ERROR_INFO errorInfo;
RFC_CONNECTION_HANDLE connection;
RFC_FUNCTION_DESC_HANDLE z_perform_callback, stfc_connection;
RFC_FUNCTION_HANDLE functionContainer;
SAP_UC data[256];



loginParams[0].name = cU("ASHOST"); loginParams[0].value = cU("10.10.10.130");
loginParams[1].name = cU("client"); loginParams[1].value = cU("300");
loginParams[2].name = cU("user"); loginParams[2].value = cU("ac_fengjm");
loginParams[3].name = cU("PASSWD"); loginParams[3].value = cU("1234567");
    loginParams[4].name = cU("SYSNR"); loginParams[4].value = cU("00");
connection = RfcOpenConnection(loginParams, 5, &errorInfo);
if (connection == NULL)
{
printfU(cU("Error during logon: %s/n"), errorInfo.message);
printfU(cU("Please check that the sapnwrfc.ini file is in the current/nworking directory and the logon parameters are ok./n"));
AfxMessageBox("连接成功");
}
else
{
AfxMessageBox("连接成功");
}