forums.silverfrost.com

[steveDoyle]

HI Everyone

Does anybody have any experience of calling a 32 fortran dll from C#. I have no knowledge of C# and the client has no knowledge of Fortran

I can successful transfer integer and Double precision data to/from the DLL but character strings become corrupt

I can successful transfer data to the DLL but the data in the common block becomes corrupt when i try to read the data back.

F_stdcall Subroutine mov_data_str (imode, cbuff80)


integer imode
character *80 cbuff80


chactacter*80 string1
common/ saved_data\ string1

if(imode.eq.0) then
string1 = cbuff80
else
cbuff80 = string1
endif

end

im assuming that it has something to do with the way the C# call is defined (pass by reference using the 'out' qualifier) and/or how the actual character variable is define in the C#

All responses appreciated

steve

[Emanuele]

Maybe the problem is that Fortran character type has not an exact equivalent in C# (.NET strings are different).

If you can recompile your Fortran dll with .NET, you can then consider the use of .NET string type in FTN95, as explained here.

[steveDoyle]

Thanks for the feedback

after much experimentation we found that we needed add an extra argument to the C# call to specify the length of the character buffer

STR_LEN = 80

C# MOV_DATA_STR32(ref IMODE, ref CBUFF, ref STR_LEN)

steve