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Try/Except structure really slowing down my code execution

Posted on 2014-04-04
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Last Modified: 2014-04-05
Hi Experts...
   In a tight While loop (reading records of a data file), I call during each iteration another procedure that does some checks on the data I read in, and performs a StrToFloat operation embedded within a Try/Except block. Running a code profiler showed me that this procedure with the StrToFloat is taking most of the processing time. Googling around I found this page:

http://www.drbob42.com/delphi/perform.htm

(just do a search for StrToFloat on that page). There it says how exception handling in a tight loop really slows things down. My question is, how can I efficiently execute my StrToFloat statement and check whether it returns a valid numeric value or not... without being in the confines of a Try/Except structure?

Thanks!
    Shawn
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Question by:shawn857
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3 Comments
 
LVL 27

Accepted Solution

by:
Sinisa Vuk earned 500 total points
ID: 39977723
you can check this way:
var
  f: double;
...
  if TryStrToFloat(s, f) then
  begin
    //f is float ....

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LVL 38

Expert Comment

by:Geert Gruwez
ID: 39979962
bring the exception to a higher level
in the inner loop you could keep track of where you are
and then when you get the exception start again at the point where the error occured

or prevent the error by happening by checking if the string is a float before converting it

or use TextToFloat which returns a boolean false if the text is not a float
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Author Closing Comment

by:shawn857
ID: 39980816
That did the trick nicely Sinisa, thank you!

Cheers
   Shawn
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