fstream -> FILE*

[barcaroller]

Is it possible to somehow get a FILE* file pointer from an fstream object?
The reason I'm asking is that I have C++ code that now needs to link to a C
library which requires FILE* file pointers.

[Zjargands]

I don't believe you can. As a class, fstream has no reason to use a
FILE* internally, it can use whatever it wants. It should be trivial to
extract the open file name however, and then reopen the file using the c
library. Make suer you set your put and get pointers for the file to the
same place they are in the fstream.

[Hendrik Schober]

No. To portably do this, you'll have to write your own file
stream buffer which is implemented in terms of 'FILE*' and
provides a means to get at the underlying 'FILE*'. It's not
trivial to do this, but it isn't all that hard either.
If non-portable is enough for you you can search for an std
lib implementation for your platform that does this. There
might be one.

Schobi