Re: Calling a Procedure from Another Program

Hi Mike,

<snip>
Anyway, back to original post. I just wanted to know if I can call a
subprocedure within a main program, apparently I can't so I broke it out to
a new module and I have it working.
</snip>

If you REALLY need to you CAN call a sub-procedure in one program from another program. To do this you simply require a procedure pointer which contains the address of the sub-proc you want to call. You can get this by adding an extra parm to the main procedure of the callee program and make this parm a procedure pointer. Call the program using a prototype and pass the procedure pointer to it. Then get the callee program to populate this parm with the address of ANY sub-procedure within it. In this scenario there is NO need for the use of EXPORT on the sub-proc. This is because the procedure address is known and this is all you need. You can then call the sub-proc using a prototype based on your procedure pointer. (of course, your prototypes should match or you may be in trouble)

If we couldn't do this then system call-back functions like CEEHDLR would not work. For this you pass the address of one of your sub-procs to "register" it and the system uses the procedure pointer you passed to call your nominated sub-proc when required. That is, the system calls one of the sub-procedures within your program object.

Probably not helpful, but this option should be noted for the archives. :-)

Cheers

Larry Ducie