This little webpage can generate your put-to and take-from operators for a C++ struct.

RESTRICTIONS:

The structs/classes must be plain old data. It does not know the difference between data members and methods.

You can have enums in the struct definition. They will be used correctly in the generated code, you can change the enum and you're good. The generated code should still work.

It is not possible to properly generate code for a pointer to an array without extra information. Pointers must point to a sole type. Arrays must be declared on the stack with a fixed length.

IN THE WORKS:

Generation of individual methods for each data member to write into the file just that data member.