Hi everyone! I am writing Fortran code on Windows 7 32-bit with MinGW. I am using the Fortran 2003 feature that allows to access APIs contained in a third party .dll library (probably) written in C with some success as I have been able to call an initialization function and a function that returns the library version. The problems come when I try to call a function to create a new file that requires three arguments: a file ID, the path to the file including its name and the path to a folder to store the temporary files. The documentation defines the syntax of the function as follows: long NewFile(long fID, char* Filename, char* Path) In Fortran I have created an interface: INTERFACE FUNCTION NewFile(uID,FileName,Path) BIND(C, NAME='NewFile') USE, INTRINSIC :: ISO_C_BINDING, ONLY: C_CHAR, C_LONG IMPLICIT NONE INTEGER(C_LONG) :: NewFile INTEGER(C_LONG), VALUE :: fID CHARACTER(C_CHAR) :: Filename(*) CHARACTER(C_CHAR) :: Path(*) END FUNCTION END INTERFACE Then I call the function with: iErr = NewFile(10,C_CHAR_'C:\\Windows\\Temp\\File.ext'// C_NULL_CHAR, & C_CHAR_'C:\\Windows\\Temp'// C_NULL_CHAR) The compilation of the test program Demo.exe is made very simply with: gfortran -c APICall.f90 (containing the interfaces) gfortran -c APIConst.f90 (containing the definition of some constant values) gfortran -c APIDemo.f90 (containing the main demo program) and then I link everything with: gfortran -o APIDemo.exe APIDemo.o APIConst.o APICall.o API.a where the import library API.a was created from the .dll and a .def file with: dlltool -d API.def -l API.a Unfortunately, at runtime the program crashes with the message: Program received signal SIGSEGV: Segmentation fault - invalid memory reference. Backtrace for this error: #0 6f6a5456 #1 6f69321f #2 004011e9 I suspect that the problem regards the definition of the char arguments. Unfortunately, I am not very familiar with C language and, to be honest, I don't know the meaning of those "char*" in the syntax (I know that "char *Filename" would be a pointer, but "char* Filename" is beyond my knowledge). Thank in advance for any help on solving this! Pietro
