Remote Enable your RFC_HOST_TO_IP to return Host IP to JCo

[Former Member]

Remote Enable your RFC_HOST_TO_IP to return Host IP to JCo

Recently I found a quite of lot information sharing at SDN related to RFC's. I read the blogs My new best friend, Mr. RFC_VERIFY_DESTINATION by Craig and RFC_READ_TABLE - my old faithful - what has happened to you? by Piers and found them very useful. I was working on a JCo application and wanted to use RFC function module RFC_HOST_TO_IP to display the IP address of an RFC host using the Host name. The real problem was that this function module is not Remote Enabled.

Hence I was not able to access the Repository using JCo because of com.sap.mw.jco.JCO$Exception: (104) RFC_ERROR_SYSTEM_FAILURE: The function module "RFC_HOST_TO_IP" not released for 'remote' calls.

Then after a few modifications by copying the standard function module and I was able to get the required result. Here in this blog I am explaining the steps that I followed to get the host IP address.

First I copied the standard code to a new function module ZC1_RFC_HOST_TO_IP.

I set the Processing Type as Remote Enabled Module.



Then in the importing and exporting parameters tab make the Parameter Type as TYPE for RFCHOST and RFCIP.




And in the Include for Sub Programs keep only the following code, which is sufficient for the required purpose.

*----------------------------------------------------------------------**   INCLUDE LZC1_RFC_GROUPF01                                          **----------------------------------------------------------------------**---------------------------------------------------------------------**       FORM HOST_TO_IP                                               **---------------------------------------------------------------------*form host_to_ip using value(host) changing ip subrc.  data : host2(2).* data : l_ip(64). "No IP translation  ip = host.  subrc = 0.  if host = space. exit. endif.  host2 = host.  if host2 = '%%'. exit. endif.        "SAPGUI  if host2(1) = '/'. exit. endif.      "saprouter  call 'RFCControl' id 'CODE' field 'A'                    id 'IP' field ip   "l_ip                    id 'HOSTNAME' field host.  if sy-subrc <> 0.    message s000(zc1msg) with host.  endif.  subrc = sy-subrc.endform.                    "host_to_ip

And now just activate and execute the program the required IP Address will be displayed.



Then coming to the JCo part things are as usual and the following code fetched the IP address for a RFC Host.

/* * Created on Jul 26, 2005 * * To change the template for this generated file go to * Window>Preferences>Java>Code Generation>Code and Comments */package com.MyJCoPrograms;import com.sap.mw.jco.*; /** * @author kathirvel * * To change the template for this generated type comment go to * Window>Preferences>Java>Code Generation>Code and Comments */public class HostToIPConversion { public static void main(String[] args) {    // Necessary fields for Connection   JCO.Client myConnection = null;  JCO.Repository myRepository = null;  JCO.Function myFunction = null;  JCO.Field myHostName = null;    // Establishing a connection  try{   // Defining the connection parameters   myConnection = JCO.createClient("Client","User","Password","Lang","ServerIP","Sys Number");   myConnection.connect();   // Creating a repository    myRepository = new JCO.Repository("WIPRO",myConnection);   System.out.println("The Connection was established successfully");  }catch(Exception E1){   System.out.println(E1.toString());   System.exit(1);  }    // Getting the fuction module from the repository  try{   IFunctionTemplate myFunctionTemplate = myRepository.getFunctionTemplate("ZC1_RFC_HOST_TO_IP");   myFunction = myFunctionTemplate.getFunction();  }catch(Exception E2){   System.out.println(E2.toString());  }    // Setting the host name and fetching the IP address  try{   myHostName = myFunction.getImportParameterList().getField("RFCHOST");   myHostName.setValue("sappdc");      myConnection.execute(myFunction);   System.out.println("The IP Address for the Host ["+myHostName.getString()+"] is :"+myFunction.getExportParameterList().getString("RFCIP"));  }catch(Exception E3){   System.out.println(E3.toString());  }    // Finally closing the connection  finally{   myConnection.disconnect();  } }}

And the Java code returned the correct IP Address.

Apart from working similar to the standard function module this also helps me to the IP using the JCo. Thus I thought it was nice to share this every one so that we can customize some good function modules as Remote Enabled for our External Applications.