CHECK-SUM

[MBTra...@aol.com]

I use information given by the CHECK-SUM feature of Pick to determine
whether or not certain data items have changed.

Short of writing my own routine, can anyone suggest a similar tool [or
workaround] on QM?

Malcolm Bull

[Martin Phillips]

Hi Malcolm,

QM has the CHECKSUM() function in QMBasic. You could build an I-type
dictionary item and then use this (or an equivalent EVAL expression) in a
query.

Martin Phillips
Ladybridge Systems Ltd
17b Coldstream Lane, Hardingstone, Northampton, NN4 6DB
+44-(0)1604-709200

[MBTra...@aol.com]

Thanks, Martin, I thought that I had looked everywhere. CHECKSUM() is
just what I wanted.

Malcolm Bull

[CDMI - Steve Trimble]

Martin:

i'm trying to learn more about I type dictionary items.

could you show a working example of what you've suggested.

maybe if i see enough examples, the light bulb will eventually burn brighter.

 

thanks!
 

Steve Trimble

Computerized Data Mgmt Inc
PO Box 13403
Maumelle, AR 72113
(501) 803-0974 09:00am - 6:00pm CST

 

Home of self defense products: http://www.protecturself.com

[Martin Phillips]

Hi Steve,

 

An I-type is simply a QMBasic expression, just as you might write on the right of an assignment statement in a program. The names used in this expression are other items defined in the same dictionary.

 

In this particular example, the expression is simply use of the CHECKSUM() function.

 

1: I

2: CHECKSUM(fieldname)

3:

4: Checksum

5: 10R

6: S

 

I do not know how Malcolm has used this but, if all he wanted was a checksum over the entire record, line 2 could be

   CHECKSUM(@RECORD)

[CDMI - Steve Trimble]

thanks Martin - the CHECKSUM(@RECORD) actually makes sense to me.

i understand the syntax of the I type (which is well documented). i just need help seeing examples of real uses.

 

thanks again!
 

Steve Trimble

Computerized Data Mgmt Inc
PO Box 13403
Maumelle, AR 72113
(501) 803-0974 09:00am - 6:00pm CST

 

Home of self defense products: http://www.protecturself.com

----- Original Message ----
From: Martin Phillips <martinp...@ladybridge.com>
To: Ope...@googlegroups.com

[CDMI - Steve Trimble]

Martin:

i just visited the online docs and can't seem to find where CHECKSUM() is documented.

i looked in the index (where normally i find all syntax) and i performed a search on 'CHECKSUM' and 'CHECKSUM()' with no results.
 

[Martin Phillips]

Hi Steve,

> i just visited the online docs and can't seem to find where CHECKSUM()
> is documented.

We were recently told about this omission. It has been corrected for the
next release.