Conversion of large Hypercard Stack to Revolution

Paul Looney support at
Sun Aug 15 13:54:13 CDT 2010

Yes, Mark,
"wait 0 secs with messages" is better.
The "NULL Hypothesis" is a bit strange but we have encountered many  
problems (data disappearing, sorts not working right, filters  
filtering too much) all of which were fixed by striping NULLs from  
the data before performing the action. Now it is always one of the  
first things we do.
I was suggesting removing the NULLs either from each record as it is  
imported to the text file - or removing the NULLs from the text file  
before using it with Rev. I agree that it would be a bad idea to  
removed NULLs from the HC stack directly. Sorry I didn't make that  
Paul Looney

On Aug 15, 2010, at 11:38 AM, Mark Schonewille wrote:

> Hi,
> "wait 0 secs" really should be "wait 0 secs with messages" to have  
> the effect you want.
> Stripping the NULLs is an interesting idea, but there is no way to  
> do this inside of HC as far as I know and removing _ALL_ NULLs  
> might break the stack.
> --
> Best regards,
> Mark Schonewille
> Economy-x-Talk Consulting and Software Engineering
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> On 15 aug 2010, at 17:16, Paul Looney wrote:
>> Richard,
>> We've done a lot of large HC to Rev conversions and have run into  
>> the same problem.
>> 1. Make sure the original HC stack has been compacted, several times
>> 2. Strip all NULLs before import. These can get into the data if a  
>> user has pasted text into the HC fields from Word or some other  
>> programs. It appears that Rev removes all data between the NULLs.
>> 3. Don't use Rev cards for a large number of records, it just  
>> won't handle the information in this format as well as HC did.  
>> Move to a database - or use a text file for the data.
>> 4. Put in some wait states ("wait 0 seconds") in your import  
>> routine to let the computer "catch up" and finish processing  
>> current information before continuing.
>> 5. Don't try to view the information in a Rev field. This will  
>> truncate any information beyond approx 64,000 characters in a  
>> line. If you view it in a field and then put the field back into  
>> the DB, all of the truncated info will be lost.
>> Paul Looney
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