[TRNSYS-users] C++ API not working

[Yuichi Yasuda via TRNSYS-users]

Michael,

I assume you are using TRNSYS16 coding style in your component. I'm not 
sure that the getMaxLabelLength() function works with the coding 
style.However, the function works fine in my TRNSYS'17' coding style 
component.

The getDeckFileName() seems to me that the function does not care about 
C/C++ strings. I have got exactly same error.
Unless, you modified the function to cope with C/C++ style, I think that 
you can not avoid the access violation error.
For example, I have added the following new function in the 
TrnsysFunction.f90 to avoid the error.

-TrnsysFunction.f90

Function getDeckFileNameEx() bind(c,name="getDeckFileNameEx")
  !dec$ attributes dllexport :: getDeckFileNameEx
  Use TrnsysData
  Use, intrinsic :: iso_c_binding
  type(C_ptr) :: getDeckFileNameEx
  Character(len=maxPathLength) ret
  ret = trim(deckn1)//CHAR(0)
  getDeckFileNameEx = C_LOC(ret)
End Function getDeckFileNameEx

- C/C++ Component sourcecode
extern "C" __declspec(dllimport) char*    _cdecl getDeckFileNameEx(void);

       char *dckfilename;
       dckfilename = getDeckFileNameEx();

I do not like this idea because an expensive Fortran compiler is needed 
to build.
Does anyone know that how to call FORTRAN function returns characters?

Best regards,

Yuichi Yasuda
quattro corporate design co.,ltd
T2000 Bld. 4F, 1-11-29 Mita, Meguro-ku, Tokyo, 153-0062, Japan
Tel:+81 (0)3 5768 6744 Fax:+81 (0)3 5768 6745
Email: yasuda at qcd.co.jp
http://www.qcd.co.jp/






On 2016/05/21 0:22, Michael Holzhauser via TRNSYS-users wrote:
> Hello all,
>
> I managed to build a customized TRNSYS Type in C++ by extending the 
> Type202 example that is delivered with TRNSYS 17. I can access the 
> input values and return the corresponding output values without any 
> problems. However, the communication with the TRNSYS Core functions 
> somehow don’t work. Whenever I invoke some function that returns an 
> integer value (like getMaxLabelLength()), the result is NaN. Whenever 
> I try to invoke some function that returns characters (like 
> getDeckFileName()), TRNSYS crashes with something like „Access 
> violation at address XXXXX in module ‚TRNDLL.DLL‘. Write of address 
> XXXXX.“ or with „forttrl: severe (408): fort: (18): Dummy character 
> variable ‚GETLABEL at 0‘ has length 300 which is greater than actual 
> variable length 1“ (in case of getLabel).
>
> As I read in other topics like this one, there seemed to be several 
> issues in the TRNSYS.h header file and the library files long ago:
> https://www.mail-archive.com/trnsys-users@engr.wisc.edu/msg00005.html
>
> However, 11 years later, is there a workaround for this problem?
>
> Thanks in advance.
>
> --
>
> M.Sc. Michael Holzhauser
> AG Optimization
> University of Kaiserslautern
>
> Paul-Ehrlich-Str. 14 - 451
> 67663 Kaiserslautern, Germany
>
> Phone: +49 (631) 205-2511
> E-mail: holzhauser at mathematik.uni-kl.de 
> <mailto:holzhauser at mathematik.uni-kl.de>
>
> www.mathematik.uni-kl.de/~holzhauser 
> <http://www.mathematik.uni-kl.de/%7Eholzhauser>
>
>
>
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