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error trapping

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  • error trapping

    I am new to Alpha 4 and learning. I have a very simple (I hope) problem with trapping an error.

    for instance.. in my script I have the recorded the keystrokes

    I (index)
    E (erase)
    A (the last index created)

    if the index does not exist, I want the next lines of the script to continue on as if nothing happened.

    What can I add to this script to catch the error and continue?
    For example....

    {I} {Enter} {E} {Enter} (A} {Enter}

  • #2
    RE: error trapping

    Will,

    I haven't done much with A4 (V6) in a LONG time, but...

    You are going to have an index - either the default record number, or one you create.

    Take a look at the IF-THEN statement, or CASE SELECT statement. They are both 'standard' programming tools that are supported in just about every programming language. If you have any problem understanding how to use either of them, let me know.

    Dave
    Dave Jampole
    www.customalpha.com

    Women and cats will do whatever they want. The sooner men and dogs realize that, the happier they will be.

    Comment


    • #3
      RE: error trapping

      Thanks Dave,
      I know, I know ... I have a lot to learn about Alpha4.. .. all my past experience has been with Foxpro and I know how to handle error trapping there.

      Hate to look like a dummy but

      I tried to work already with the if-then statement with
      the simplest of scripts

      I (index)
      E (erase)
      b (select the b index)(or simply pass the enter key)

      the followint is not the syntax.. but shows what I am trying to accomplish.

      if(no index "b" exists,ignore and continue,else{delete the b index))

      Everything I have tried failed miserably.
      I cant find the appropiate statement that says if no b index exists, keep right on rolling to the next line of the script.

      Havent tried the case statements with this problem.

      Comment


      • #4
        RE: error trapping

        Will,

        I'll crank up my A4V6 when I get home this evening and I'll send you the syntax. If not this evening, then tomorrow afternoon when I get done with classes for sure.

        Dave
        Dave Jampole
        www.customalpha.com

        Women and cats will do whatever they want. The sooner men and dogs realize that, the happier they will be.

        Comment


        • #5
          RE: error trapping

          Will,

          Forget the Case statement, you situation doesn't require it.

          I had something almost written using an IF statement, but I think we can do it even simplier. Just write a script (let's call it "REMOVEB') with these keystrokes IEBY, the 'Y' confirms the erasure of Index B. Save it and then write a second script with {PLAY "REMOVEB"} on the Keys/Commands line. This second script will play the original script.

          Dave
          Dave Jampole
          www.customalpha.com

          Women and cats will do whatever they want. The sooner men and dogs realize that, the happier they will be.

          Comment


          • #6
            RE: error trapping

            {ALTF10:2}
            {SCREENFREEZE}
            ipaip
            {READ·%ROW24A,24,1,27}
            {DN}
            {READ·%ROW24B,24,1,27}
            {ESC}
            {IF·%ROW24A··%ROW24B,{IEAY}}
            {SCREENON}

            Comment


            • #7
              RE: error trapping

              Thanks for the reply Dave, however, your solution will not work if a b index doesnt even exist.

              I dont know if I am explaining mys problem clearly.

              I hope what Gary sent is more what I need. I wont be able to try it till Monday. Thanks Gary.

              Comment

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