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David FOXWELL wrote:
...
I just wrote my first program ever that passed a pointer from one
program to another. I used it to access a data structure in the
calling program that was alimented by the program being called. I
won't explain why I did not just pass the data structure as a
parameter. ...
Hi David, you said that you won't explain why you didn't just pass the
data structure as a parameter. But ... I have to ask anyway :) I think
it's an important question.
When you define your procedure to have a pointer parameter, you are
making it difficult to call the procedure correctly.
It's very easy to call your program correctly:
PGM2 (%addr(MyDs));
But with that prototype, it's also very easy to call it incorrectly:
PGM2 (%addr(*INLR));
PGM2 (%addr(MyDs(i).mySubfield));
If you want your program to be passed a data structure, then the best
idea is to code the prototype to say this, by defining the parameter
with LIKEDS. When the prototype says that your program wants to be
passed a pointer, you make it impossible for the compiler to ensure you
pass a correct parameter, and you make it difficult for other
programmers to know what to pass as a parameter.
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