Efficient way to send files across processes

How to effectively send a file from my own process to a program such as Photoshop, Word, Paint. I do not want to save the whole file to disk and then open the program from the startup parameters using CreateProcess, ShellExecute, etc. Maybe t开发者_StackOverflow中文版he only way out is Memory Maped Files? Maybe I should look to COM, IPC, Pipes?

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You cannot tell these programs that your file data is actually a memory mapped file. That really doesn't matter, files are already memory mapped by default. Much more efficiently than a MMF, file data is stored in RAM and doesn't take any space in the paging file.

The file system cache takes care of that. Think of it as a large RAM disk without actually having to pay for the RAM. This works so well that there never was a need for these programs to do something else than accept their input from a file.