[tcljava-user] How to use Interp.setResult?

[Bret C. W. <bc...@ya...>]

Hello,

I have not found good documentation for some of Jacl - the API docs on
the tcljava.sourceforge.net site are not giving me a good enough
understanding to determine how to solve an exception.

I have a command-line java program.  In it's primary class constructor,
it creates a TCL Interp session with the name of an external script
file, and exits when the Interp session is complete.  In response to
various commands found in a script, various Java objects are created,
and methods called on those objects from the script.  I have a number of
working examples of this, including some that successfully return values
to the Interp session for further processing.

But I haven't figured out what Interp.setResult() does, and it looks as
if it might be useful.  Consider these two methods.  The first
(getColumnCount) works as expected, and I can access the return value in
my script.  The second (getEntry) always provokes the exception listed
below.  'myInterp' was set with a reference to the (one-and-only) Interp
session when the object these methods belong to was created and is valid
for the entire time.

Please don't tell me to read the docs, I have and have tried many
experiments and they don't tell me what circumstance to use the
Interp.setResult() method in or what might be the problem here.

Thanks in advance,
bcw

TCL:
$tableName getEntry $column $row

Java:
      /**
       * *@return* int - The number of columns in this result set.
       */
      *public* *int* getColumnCount()
            {
            log.debug( "getColumnCount - columnCount is " + columnCount );
            *return* columnCount;
            }
 
      *public* *void* getEntry( String columnName, *int* currentRow )
*throws* TclException
            {
            log.debug( "getEntry - column name is " + columnName );
            myInterp.setResult( "an Answer" );
            }
 
 
tcl.lang.ReflectException
            at tcl.lang.JavaInvoke.call(JavaInvoke.java:328)
            at tcl.lang.JavaInvoke.callMethod(JavaInvoke.java:161)
            at tcl.lang.ReflectObject.cmdProc(ReflectObject.java:916)
            at tcl.lang.Parser.evalObjv(Parser.java:826)
            at tcl.lang.Parser.eval2(Parser.java:1228)
            at tcl.lang.Parser.evalTokens(Parser.java:1008)
            at tcl.lang.Parser.eval2(Parser.java:1215)
            at tcl.lang.Procedure.cmdProc(Procedure.java:174)
            at tcl.lang.Parser.evalObjv(Parser.java:826)
            at tcl.lang.Parser.eval2(Parser.java:1228)
            at tcl.lang.Parser.evalTokens(Parser.java:1008)
            at tcl.lang.Parser.eval2(Parser.java:1215)
            at tcl.lang.Interp.eval(Interp.java:2679)
            at tcl.lang.Interp.eval(Interp.java:2747)
            at tcl.lang.IfCmd.cmdProc(IfCmd.java:64)
            at tcl.lang.Parser.evalObjv(Parser.java:826)
            at tcl.lang.Parser.eval2(Parser.java:1228)
            at tcl.lang.Interp.eval(Interp.java:2679)
            at tcl.lang.Interp.eval(Interp.java:2747)
            at tcl.lang.ForeachCmd.cmdProc(ForeachCmd.java:98)
            at tcl.lang.Parser.evalObjv(Parser.java:826)
            at tcl.lang.Parser.eval2(Parser.java:1228)
            at tcl.lang.Interp.eval(Interp.java:2679)
            at tcl.lang.Interp.eval(Interp.java:2747)
            at tcl.lang.WhileCmd.cmdProc(WhileCmd.java:43)
            at tcl.lang.AutoloadStub.cmdProc(Extension.java:119)
            at tcl.lang.Parser.evalObjv(Parser.java:826)
            at tcl.lang.Parser.eval2(Parser.java:1228)
            at tcl.lang.Procedure.cmdProc(Procedure.java:174)
            at tcl.lang.Parser.evalObjv(Parser.java:826)
            at tcl.lang.Parser.eval2(Parser.java:1228)
            at tcl.lang.Parser.evalTokens(Parser.java:1008)
            at tcl.lang.Parser.eval2(Parser.java:1215)
            at tcl.lang.Interp.eval(Interp.java:2679)
            at tcl.lang.Interp.evalFile(Interp.java:2940)
            at
com.ssg.dataconverter.DataConverter.<init>(DataConverter.java:76)
            at
com.ssg.dataconverter.DataConverter.main(DataConverter.java:159)