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The Question is:
Hello
I want to use FTP from a program, so I built a Fortran program that calls a
C-subroutine that uses SYSTEM-call to run a .com file that does the job.
This does not work, but if I make a program of the C-subroutine and run i,
all is well.
Why?
The Answer is :
"Does not work" is a classic though rather inexact description of a
program, the particular problem(s), and/or the error message(s) that
might have resulted... The OpenVMS Wizard will thus (have to) guess...
In this case, the OpenVMS Wizard would suggest using lib$spawn directly
from Fortran, not a call to a C routine.
C has a run-time environment initialization step required when C
subroutines are used when a C main is not present -- if you choose
to continue the current approach, remember to call VAXC$CRTL_INIT
to initialize the C run-time library at the appropriate point...
C also has differing string expectations than Fortran, and this problem
could simply be case of an argument-passing error -- compatible passing
is available and mixed-language calling is supported, but the string
argument passing defaults do differ between these two languages...
As for the command used, COPY/FTP is also a typical approach for the
desired operation. This (V6.2 and later) syntax permits the use of
a single command for the FTP operation...
Also be aware that system and lib$spawn do not operate when there is
no CLI environment present -- the oft-discussed SS$_NOCLI error will
arise when a CLI (such as DCL) is not available and a CLI callback
(such as lib$spawn or system) is made... (See the SS$_NOCLI details
in the FAQ for a related discussion.)
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