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[BillJohnson]

I am having a very difficult time passing attributes from a Visual Studio C# function into a compile FORTRAN Subroutine. I can't seemed to figure out the attribute declarations.

Here's the main error message,

Error 4 The best overloaded method match for 'NIST_Fluid_Props.SETUP(int*, Salford.Fortran.Character*, Salford.Fortran.Character*, Salford.Fortran.Character*, int*, Salford.Fortran.Character*, int, int, int, int)' has some invalid arguments

It is telling me some invalid arguments....but not which ones.

Here are the remaining errors:

Error 5 Argument 1: cannot convert from 'int' to 'int*'
Error 7 Argument 3: cannot convert from 'string' to 'Salford.Fortran.Character*'
Error 8 Argument 4: cannot convert from 'char[]' to 'Salford.Fortran.Character*'

[PaulLaidler]

To start with you should read from ftn95.chm under

.NET platform->.NET Prograamming ->Calling Fortran from other .NET languages

[BillJohnson]

Hello Paul,

Thank you for the advice. I have gone thru the help doc and can't find any specific examples for support my problem. Mainly, I am dealing with two problems right now:


Cannot convert from 'string' to 'Salford.Fortran.Character*'

and

Cannot convert from 'char' to 'Salford.Fortran.Character*'

Neither one of these is accepting a variable dimensioned as a 'string' or as a 'char'


Please advice. Or maybe you could provide a simple example. The FORTRAN sub I am trying to execute is the following: SUBROUTINE SETUP (nc,hfiles,hfmix,hrf,ierr,herr) with the attributes dimensioned as follows:

c nc--number of components (1 for pure fluid) [integer]
c if called with nc=-1, the version number*100 will be returned in ierr
c hfiles--array of file names specifying fluid/mixture components
c [character*255 variable]
c hfmix--mixture coefficients [character*255]
c hrf--reference state for thermodynamic calculations [character*3]

[PaulLaidler]

My knowledge of the interaction between C# and FTN95 is a little rusty but if you can post a few lines of C# code together with the relevant Fortran then someone out there may be able to help you.

[BillJohnson]

Hello Paul,

Here's a snippet of the Fortran subroutine I am trying to call from Visual Studio C# below.

FORTRAN SUBROUTINE CALL - INSIDE FORTRAN:
subroutine SETUP (nc,hfiles,hfmix,hrf,ierr,herr)


FORTRAN VARIABLE DIMENSION STATEMENTS - INSIDE FORTRAN:
character*255 hfiles(ncmax),hfile(n0:nx),hfmix,hfmix2,rflnam
parameter (ncmax=20)
parameter (n0=-ncmax-nrefmx,nx=ncmax)


hfiles and hfmix is a string character specifying the location on ASCII text files to be read by the FORTRAN Subroutine.

For Example hfiles = "c:\program files\refprops\data\water.txt"

[PaulLaidler]

There is not enough information here. What is needed is a few lines of C# code together with a few lines of Fortran code which together would form a working program that illustrates the problem. At the moment we can only guess at what you are trying to do.

[Emanuele]

Dear Bill,

To pass strings, I adopted this strategy:
1) declare the argument as string;
2) declare a corresponding-length character variable;
3) convert explicitly the string into character.

For example: