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On 16/05/2009, at 5:23 AM, Dan Kimmel wrote:
MCH3601 is "Pointer not set for location referenced." It is a common
programming mistake. Trying to dereference a pointer that hasn't been
set. (In i, "not set" is different than null.)
Don't think so. A null pointer has not been set to an address. That's
all MCH3601 is complaining about. Perhaps you are thinking of an
"unresolved" system pointer (which is essentially also "not set" but
because the pointer type is known a different message can be sent)?
One might question why "Pointer not set for location referenced" is
used instead of a more obvious message. The code referenced a storage
location that was expected to contain a pointer but it didn't have a
valid address. Second-guessing the designers here but it seems to me
that you could have a pointer chain in which one of the pointers was
not set. How do you indicate a pointer buried in the chain is not set?
In this case the "location referenced" would refer to the last good
pointer and that it is pointing to an un-set pointer.
So probably the problem is in your code.
That is the most likely explanation for MCH3601 errors. We really need
to be told the "from program" and "to program" values from the
exception to know where to start looking.
QMHSNDM, as most system API's takes pointers for parameters. I'm not
sure if the command interpreter (invoked through "system") is going to
resolve all your constants into pointers.
Highly unlikely that 'system' is the program. The QMHSNDM API can be
called from the command line and via QCMDEXC. 'system' is simply
another interface to QCMDEXC. In all cases the real work is done by
the CALL command.
Also, I'd be interested to see if tht printf was actually producing
what you intend.
Yes, that's a useful diagnosis step: See if the final formatted
command looks like a properly formatted OS/400 command.
Regards,
Simon Coulter.
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