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Problem using FC17 "INSERT" IEC function

Created by: Steve QM at: 7/7/2009 7:14 PM (1 Replies)

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7/7/2009 7:14 PM	Rate (0)
Steve QM Posts: 9 Rating: (0)	I am trying to use this function to insert some variable strings into an existing template string for sending to a barcode printer. IN1 and RET_VAL both point to a copy of my templatestring (the original template string never gets modified) and IN2 points to my variable string. The result is that the variable string is inserted a number of times and also overwrites part of the template string. I canwork around this by specifying separate strings for IN1 and RET_VAL and then copying the output string back to the input string using BLKMOVE, however this strikes me as inefficient use of time and memory. Is there a better alternative?
Steve QM Posts: 9 Rating: (0)	Last edited by: Steve QM at: 7/7/2009 7:17 PM
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7/8/2009 7:57 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 10/9/2024 Posts: 3024 Rating: (1054)	Hello Steve QM I'm afraid not (well, none thatI can think of anyhow apart from developing your own String insert Function). The is a reason why FC17 does what you observed and it has to do with the fact that STRINGS are so called complex data types and FC17 will use pointers internally to determine the data addresses of the Stringsand write directly to these addresses rather than buffering the Stringsinternally. Add to that the fact that FC17 uses the actual String lenght (the first two bytes of a Stringcontain the max lenght and actual lenght respectively) towork out where to insert IN2 String into IN1 String and then calculate the actual lenght of RETVAL String and it has no chance but to get confused when IN1 and RETVAL are in the same data location. Anyway, I hope this helps (or at least somewhat explains).
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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