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How to process RAM data as if it were a real file?

So, I have temporary data in my program (in RAM). I want to somehow show that this is a file (for example, to send it to another program that takes a file link as an argument)?

Is it possible?

How to do it?

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5 answers

You can do this in C using the popen() function:

 FILE *f = popen("program args", "w"); // write your output to f here using stdio pclose(f);

This is possible if your external program reads its input from stdin .

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Why not just burn the file to disk? If writing to disk is too slow, you can pass the FILE_ATTRIBUTE_TEMPORARY flag to CreateFile to save the data in the cache (and not write it to the physical device).

Sometimes obvious solutions are the best ...

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If you support your operating system (Unixoid and Windows systems), you can try to use memory mapped files .

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You can use pipe ()

  The pipe () function shall create a pipe and place two file descriptors,
 one each into the arguments fildes [0] and fildes [1], that refer to the
 open file descriptions for the read and write ends of the pipe.  Their
 integer values ​​shall be the two lowest available at the time of the
 pipe () call.  The O_NONBLOCK and FD_CLOEXEC flags shall be clear on both
 file descriptors.  (The fcntl () function can be used to set both these
 flags.)
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Yes it is possible. You can transfer your data to another application through the interprocess communication mechanism:

  • Depending on your OS, you have different options. You could create a channel, as other posters mentioned here, as many operating systems have channels.
  • You can also use shared memory.
  • You can simply write it to a file and then open that file in your other application.
  • Many operating systems have other methods that you can use.

EDIT: MSDN lists all the IPC mechanisms available for Windows here .

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