reading fortran binary file in c++

Question

The problem of reading (with c++ program) binary file generated by fortran code has been asked many times and the satisfactory description of conventions in fortran records has

Answer 1

operator>> is the formatted input operator. It is used to read text files, converting the textual representation to binary.

You should be reading using unformatted input operations. Try this:

file.read(reinterpret_cast<char*>(&ival), sizeof ival);

Of course, after you read it, you may need to byte swap for correct endian representation.

Answer 2

Open it in a hex editor and dig out the structure. Is the header size 16, 32, 64 or 128 bits and which end up is it?

Hex editor..