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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. Anyway, it seems to work. I was a little surprised and found it good fun. However, having rather stumbled upon the solution when it didn't work, I ask the experts out there for confirmation :
Code simplified.
D PGM2 PR EXTPGM ( 'PGM2' )
D OutParm *
D MyDS DS LIKEDS ( gMyOtherDS ) DIM ( 100 )
D BASED ( MyPtr )
D MyPtr S *
/free
PGM2 ( MyPtr );
/end-free
This crashed because I understand I need to allocate storage for MyPtr before the call.
So I inserted this and it worked :
wLen = %LEN ( wMrsAdh ( 1 ));
MyPtr = %ALLOC ( wLen * 100 );
Is this the right way to initialize the pointer?
Thanks.
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