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You have a choice, declared in the called procedure:
Pass by reference
Pass by value
Pass by read-only reference
Gary
Dave Wall wrote:
>
> Sorry it took so long to get back to you. I don't know this level of
> detail concerting RPG so I asked around trying to find out if character
> parameters in RPG are passed on the stack or if a pointer is passed. No
> one answered my question but I would think they would be passed by
> reference. I would think it would work better if it was pass by reference.
> Anyone else on the forum know how character parameters are passed in RPG?
>
> David Wall
> AS/400 Toolbox for Java
>
>
> "Price, Chris"
> <chris_price@nsb.c To:
>"'JAVA400-L@midrange.com'" <JAVA400-L@midrange.com>
> o.uk> cc:
> Sent by: Subject: RE: AS400 Toolbox
>problems - ServiceProgramCall
> owner-java400-l@mi
> drange.com
>
>
> 08/14/2001 10:18
> AM
> Please respond to
> JAVA400-L
>
>
>
> Thanks for your example.
>
> Unfortunately it didn't work on my system as we don't seem to have a
> QTOCNETSTS service program.
>
> I'm trying to call my own service program, written in RPG IV.
> The Java class sets the String input parameter to a test value, and calls
> the procedure. The procedure compares the passed in string to a value, and
> if the same returns 99, otherwise returns -1. If written as a service
> program, the return value is always -1. Yet if I convert the service
> program
> into a program, making the nessesscary changes to the class, the return
> value is 99.
>
> Here's a sample of my Java & RPG code:
>
> public class Temp
> {
> public static void main(String[] parameters) {
>
> AS400 as400 = new AS400();
>
> QSYSObjectPathName sprogramName =
> new QSYSObjectPathName("R1005DVOBJ", "CJPTEST", "SRVPGM");
>
> ServiceProgramCall spgm = new ServiceProgramCall(as400);
>
> //Service Program Call
> try {
> // One Parameter - String in. Returns short
>
> ProgramParameter[] parmlist = new ProgramParameter[1];
>
> AS400Text text1 = new AS400Text(10, as400);
> byte[] text = text1.toBytes("CHRISPRICE");
> // parmlist[0] = new ProgramParameter(text);
> parmlist[0] = new ProgramParameter();
> parmlist[0].setInputData(text);
> parmlist[0].setParameterType(ProgramParameter.PASS_BY_VALUE);
>
> //run the serivce program
> spgm.setProgram(sprogramName.getPath(), parmlist);
> spgm.setProcedureName("CJPTEST_PROC");
> if (spgm.run() != true) {
> AS400Message[] msgList = spgm.getMessageList();
> System.out.println("The program did not run. AS/400
> messages:");
> for (int i = 0; i < msgList.length; i++) {
> System.out.println(msgList[i].getText());
> }
> } else {
> AS400Bin2 as400Int = new AS400Bin2();
> byte[] as400Data = spgm.getReturnValue();
> short result = as400Int.toShort(as400Data, 0);
> System.out.println("Service Program Call Result is : " +
> result);
>
> }
>
> } catch (Exception e) {
> System.out.println("Service Program call failed");
> System.out.println(e);
> }
>
> System.exit(0);
> }
> }
>
> The very simple RPG module:
> D CJPTEST_PROC PR 5I 0
> D String 10 Value
>
> P CJPTEST_PROC B Export
> D PI 5I 0
> D String 10 Value
> C If String = 'CHRISPRICE'
> C Return 99
> C Else
> C Return -1
> C Endif
>
> -----Original Message-----
> From: Dave Wall [mailto:dawall@us.ibm.com]
> Sent: 14 August 2001 15:45
> To: JAVA400-L@midrange.com
> Subject: Re: AS400 Toolbox problems - ServiceProgramCall
>
> Here is code to call entry point QtocLstNetIfc in service program
> QTOCNETSTS. The entry point takes three parameters -- two strings (passed
> by reference) and the error code. The strings are converted from Unicode
> to EBCDIC before being sent to the server. When calling programs or
> service programs, pay particular attention to lengths. The Toolbox client
> passes data to the program call server who dumps the data in one big
> buffer. It then passes pointers to that buffer or pulls data out of the
> buffer when calling the service program. If a length is off the wrong data
> will be passed, but since all data comes out of one big buffer you may not
> get a addressing errors (trying to get to memory you don't own). You will
> just get bad data.
>
> Are you trying to call an OS/400 service program or one of your own? Some
> Toolbox objects are implemented by calling OS/400 service programs via
> ServiceProgramCall so I know it can work.
>
> AS400 system = new AS400();
>
> // The first parm is 20 characters, 10 chars of user space followed
> by 10 chars of library.
> // Create a converter for 20 chars.
> AS400Text char20 = new AS400Text(20, system);
>
> // The second parm is the format name (8 chars). Create a
> converter.
> AS400Text char8 = new AS400Text(8, system);
>
> // Create program parameters
> ProgramParameter[] parms = new ProgramParameter[3];
>
> // First parm is qualified user space CHAR(20)
> // CHAR(0-9) is the user space name
> // CHAR(10-19) is the library name
> String qSpace = "DAW DAW ";
>
> // First parm is the library qualified UserSpace
> parms[0] = new ProgramParameter(char20.toBytes(qSpace));
> parms[0].setParameterType(ProgramParameter.PASS_BY_REFERENCE);
>
> // Second parm is the format
> parms[1] = new ProgramParameter(char8.toBytes("NIFC0100"));
> parms[1].setParameterType(ProgramParameter.PASS_BY_REFERENCE);
>
> // Last parm is the error code. We pass an array of 0x00s so
> messages are returned.
> byte[] bytes = new byte[32];
> parms[2] = new ProgramParameter(bytes, 32);
> parms[2].setParameterType(ProgramParameter.PASS_BY_REFERENCE);
>
> ServiceProgramCall sPGMCall = null;
>
> System.out.println("About to create the program");
> sPGMCall = new ServiceProgramCall(system,
> "/QSYS.LIB/QTOCNETSTS.SRVPGM",
> "QtocLstNetIfc",
>
> ServiceProgramCall.NO_RETURN_VALUE,
> parms);
>
> System.out.println(sPGMCall.run());
>
> AS400Message[] ml = sPGMCall.getMessageList();
>
> for (int i=0; i<ml.length; i++)
> System.out.println(ml[i].getID() + ": " + ml[i].getText());
>
> David Wall
> 553-5329
> AS/400 Toolbox for Java
>
> "Price, Chris"
>
> <chris_price@nsb.c To:
> "'java400-l@midrange.com'" <java400-l@midrange.com>
> o.uk> cc:
>
> Sent by: Subject: AS400 Toolbox
> problems - ServiceProgramCall
> owner-java400-l@mi
>
> drange.com
>
> 08/14/2001 05:31
>
> AM
>
> Please respond to
>
> JAVA400-L
>
> Has anyone successfully managed to call a procedure in a service program,
> using the ServiceProgramCall class?
>
> I'm having major problems getting this to work:
>
> Passing by reference doesn't work at all - get null pointer errors in the
> procedure.
>
> Passing by value works for integers, but Strings get garbled. I thought
> this
> might be a CCSID problem, but the same code works fine for a ProgramCall.
>
> Does anyone have any working examples using this class, there aren't any
> that I can find in the toolbox documentation.
>
> Confused,
> Chris.
>
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>
> =======DISCLAIMER=======
> This email transmission and any attachments may contain confidential
> information which is legally privileged. You are also notified that the
> contents of this email and any which you may send in reply, may be viewed
> by
> authorised personnel on behalf of NSB Retail Systems Plc or its
> subsidiaries
> (the Company) in accordance with the Company's Information Access Policy.
> The content of this email is always subject to contract. The information
> is
> intended only for the individual or entities to whom it is addressed. If
> you are not an intended recipient please contact me immediately and you are
> hereby notified that any disclosure, copying, distribution, storage on any
> medium or use of the information contained in this transmission is strictly
> prohibited.
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