topic Re: Calling ADA Functions with a C Program in Operating System - OpenVMS

Calling ADA Functions with a C Program

Jefferson Humber — Wed, 28 Jul 2004 22:43:27 GMT

Can anybody give me an example of how to call ADA functions within a C program ?

We have some old ADA functions which we would like to call in some new C code we are writing.

Can anybody give me any pointers on how to do code this, and ideally how to compile & link the two together.

Thanks in advance,

Jeff

Re: Calling ADA Functions with a C Program

Bojan Nemec — Thu, 29 Jul 2004 01:48:17 GMT

Hi,

Look at
http://h71000.www7.hp.com/commercial/ada/documentation.html

In the Run-Time Reference look at Appendix B and in the Developing Ada Products on OpenVMS look at 6.2 Linking Mixed-Language Programs.

http://h71000.www7.hp.com/commercial/c/docs/5492P.html
will help you for C users guide.

Bojan

Re: Calling ADA Functions with a C Program

Wim Van den Wyngaert — Thu, 29 Jul 2004 02:35:36 GMT

http://www.sysworks.com.au/disk$axpdocmar961/decw$book/d37aaa15.p93.decw$book#608

Explains it in short

Wim

Re: Calling ADA Functions with a C Program

Antoniov. — Thu, 29 Jul 2004 02:51:04 GMT

Hi Jeff,
differently from other platform, in VMS all passing parameter has managed by OS. This means it isn't important what language you are using but the corresponding of language type and VMS type.
For example I call C routine from COBOL program simply declaring the parameters.
Read carefully the Wim's link because it can help you very much.
I guess you could call ADA function by reference where in parameters point to a copy of value and out parameters point directlu to value.

Antonio Vigliotti

Re: Calling ADA Functions with a C Program

Jefferson Humber — Thu, 29 Jul 2004 11:27:17 GMT

Thank you all for you help.

That should do the trick I hope.

Cheers,

J