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C ++: the most common way to talk with one application from another

In simple loops, I have an application that looks at directories at startup and creates an index of special files - after that it works like a daemon. Another application creates such “special” files and places them in some directory. What method of informing the first application about a new file (for indexing) is the most common, simple (the first of them is runtime, so it should not be too slow) and cross-platform, if possible

I looked at RPC and IPC, but they are too heavy (also not cross-platform and slow (I need a lot of functions to work - I need a simple easy way to work), maybe).

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Pipes would be one option: see Network programming using pipes and remote procedure calls (Windows) or Creating pipes in C (Unix).

I have not done this for some time, but from my experience with RPC, DCOM, COM, .NET Remoting and sockets, I think pipes are the easiest and most efficient option.

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For Windows (NTFS), you may receive a notification from the OS that the directory has been changed. But this is not crosspl. not about two applications.

“IPC, but they are too heavy” - no, they are not at all heavy. You should look at named pipes - this IPC is the fastest, and it is both in Win / Unix, and with slight differences. Or sockets!

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Source: https://habr.com/ru/post/1737372/

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