Passing C++ character array to Fortran -


i have been trying pass character array c++ fortran subroutine seems fortran not receive characters properly. have been searching web find solution proposed ideas seem complicated. interesting (and concise) solution proposed steve @ intel fortran forum cannot work in code. so, appreciate suggestion me out resolve issue.

the following function c++ routine makes call fortran subroutines:

extern "c" void __stdcall f_validate_xml(const char* buffer, int len); void cudmeditordoc::onvalidatexml() {     cstring filename = "test.udm";     const char* buffer = filename.getbuffer();     int len = filename.getlength();     f_validate_xml(buffer, len); }

and here fortran subroutine supposed receive character array:

subroutine validate_xml(file_name, len) !dec$ attributes decorate, stdcall, alias:"f_validate_xml" :: validate_xml  use xml_reader_structure use, intrinsic :: iso_c_binding  integer(c_int), value, intent(in) :: len character(len, kind=c_char), intent(in) :: file_name  integer  :: i = 1 end subroutine validate_xml

in debug mode , when program has stopped @ line (i = 1), hover mouse on file_name see contents watch window says cannot find file_name symbol (although len correctly passed). also, if watch file_name(1:8) in watch window, still don't original character arrays. believe there wrong way pass parameters fortran chances watch window not correct.

i appreciate shed lights here. thanks

you fell trap caused saying (even on stack overflow in heavily upvoted answers) should use iso c binding construct interoperable subroutines.

that wrong, using iso_c_binding module not make procedure interoperable , not change calling conventions.

the other, separate , equally important, feature in fortran 2003 c interoperability bind(c) attribute.

notice, steve lionel has in linked example. should have

   subroutine validate_xml(file_name, len) bind(c, name="f_validate_xml")

the bind(c) changes calling conventions in several subtle ways , largest difference character strings, pass length in hidden argument, not in interoperable procedures.


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