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How do I detect a change to a blob datawindow column using the db ole in powerbuilder 10
Posted on 2009-07-08
I am trying to give the user a way to save multiple form types from a single source i.e. word doc, excel, powerpoint. I can open up the various applications and save and retrieve the information. My problem is how do I detect a change to the document so I don't have to prompt the user to save when nothing has changed. I used get changes, compared get full state blob legnths but none of this is effective.
Thanks
LW
Thanks
LW
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6 Comments
Easy. What you need is a checksum function. Exec checksum on all the bytes in the entire blob, this will produce one 32 bit value; do the checksum again at the end; compare the two checksums; if they are the same, the doc is unchanged.
I have not coded in PB for a few years, I do not recall if it has a checksum function. PB 10 was not around then, it may have. Otherwise you have to see if you can find a class object that someone has written and published. Or write your own (that's not too difficult, but it will take time; search the web and find out how it is done).
Cheers
I have not coded in PB for a few years, I do not recall if it has a checksum function. PB 10 was not around then, it may have. Otherwise you have to see if you can find a class object that someone has written and published. Or write your own (that's not too difficult, but it will take time; search the web and find out how it is done).
Cheers
Hi,
the below link can be of use to u,
http://www.experts-exchange.com/Programming/Editors_IDEs/PowerBuilder/Q_21573742.html
Cheers,
Rosh
the below link can be of use to u,
http://www.experts-exchange.com/Programming/Editors_IDEs/PowerBuilder/Q_21573742.html
Cheers,
Rosh
Storing both images in a db, and comparing them would be very slow and resource intensive, compared with calculating a checksum in pure memory.
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