Article #15834: RETURNING ERROR LEVELS TO BATCH FILES

 Technical Notes Database

TN834D.txt   RETURNING ERROR LEVELS TO BATCH FILES
Category   :Pascal
Platform    :All
Product    :Turbo Pascal  4.0+

Description:
Q. How do I set the error level within a Turbo Pascal program and
   test for the error level inside a batch (.BAT) file?
A. The DOS error level can only be checked in a .BAT file and
   only a line immediately following the application that is
   returning the DOS error level.  For example, suppose in the
   program TEST we set the error level to 5.

     Begin
       HALT(5);
     End.

   Then in a .BAT file we could have

     TEST
     IF ERROR LEVEL
        go do something ...

   The IF ERROR LEVEL 4 will evaluate to true because 5 is
   greater than 4 and the "go do something..." part will be
   executed.  Note that you must always check the highest
   possible error level first. The expression IF ERROR LEVEL 0
   will ALWAYS evaluate to true.


Reference:


7/16/98 4:35:36 PM
 

Last Modified: 01-SEP-99