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  2. RPG400-L
  3. June 2003

RE: parameters - const, value, reference

Joe,

At 6/20/03 05:55 PM, you wrote: 
The nice thing about CONST as opposed to VALUE is that CONST can be used
with EXTPGM calls.  One good example is for QCMDEXC; if you specify the
length as CONST, you can pass in an expression such as %LEN(CmdString).  In
the following example, assume command, lib and file are all VARYING strings:

DQcmdexc          PR                  EXTPGM('QCMDEXC')
D Cmd                          128    const
D CmdLen                        15  5 const

C                   eval      command = 'CRTPF ' + lib + '/' + file
C                   callp     Qcmdexc(command:%len(command))

I think that this code will give you an error. You need OPTIONS( *VARSIZE ) on the Cmd definition. Otherwise you will get the leading 2 characters (binary length of varying variable) being passed to QCMDEXC.

-mark


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