sap rfc调用时判断连接状态(找了1天,郁闷啊)

代码中出现了一个常数tloRfcConnected,在vb6.0中可用,可是在vb.net中不可用,到底这个是什么意思哪,如下是sap的解释:

Connection Property: IsConnected 

Purpose

Checks the current status of the Connection object and the R/3 connection.

Returns

type String.

Description

Use this property after the Logon method has returned FALSE. All valid values for the IsProperty property are given in the RfcConnectionStatus table:

RfcConnectionStatus values

 

Logon method has returned FALSE. All valid values for the IsProperty property are given in the RfcConnectionStatus table:

RfcConnectionStatus values

tloRfcNotConnected= 0	The R/3 connection is not established, Logon was not called, or Logoff has been called.
tloRfcConnected = 1	The R/3 connection is established.
TloRfcConnectCancel= 2	The R/3 connection is not established due to the fact that the user pressed the Cancel Button during Logon.
tloRfcConnectParameterMissing = 4	The R/3 connection could not be established, due to the fact that a silent logon was attempted with connection parameters.
TloRfcConnectFailed = 8	The R/3 connection failed. Call LastError to display additional information.

 

 代码示例如下：

            If m_cnnRFC.IsConnected <> 1 Then
                ConnectState = False
            Else
                ConnectState = True
            End If