我可以在iOS上的C / Objective-C中创建内存映射的FILE *吗？

Question

I have a library which consumes a FILE * and outputs data to another FILE * .

I want to handle both the input to this library and the output from this library in memory without reading/writing to/from a file on the disk.

We're doing this in iOS - so running the library as a separate app and using stdin / stdout isn't (as far as I know) a viable option.

Answer 1

Because ObjC is a superset of C, all you have to do is #import/#include <stdio.h> to gain access to the funopen() which in itself contains the functions readfn , writefn , seekfn , and closefn . And fwopen which has an example showing how to write to two streams at this other SO question .

Mac OSX and iOS don't include fmemopen and open_memstream because they are apparently unportable linux functions

As of macos 10.13, ios 11.0, tvos 11.0, and watchos 4.0, fmemopen and open_memstream along with a few other helpful POSIX.1-2008 standard functions are available in stdio.

Answer 2

Have a look at https://github.com/shyuep/pyhull/tree/master/src/fmemopen , I've tested it myself on a Mac OSX 10.8.2 and it is working ok.

Author states it should also work on iOS.