is there a way to check if external data is piped to a program or if program runs on its own?

问题

That is the data is already provided by another program, or user must type it manually. I mean these two states:

dir /b /s *.* | myprogram

and

myprogram

In second case the program would be waiting for user input. Is there a way to prevent that ?

回答1:

POSIX has isatty(), whereas Visual C++ has _isatty(), both of which will return true if a file descriptor is a terminal or command line, e.g. isatty(fileno(stdin)).

回答2:

Yes. Use GetStdHandle to get the STD_INPUT_HANDLE and then check that the handle is of the type FILE_TYPE_PIPE in the first case or FILE_TYPE_CHAR in the second case by calling GetFileType on it.

来源：https://stackoverflow.com/questions/10574797/is-there-a-way-to-check-if-external-data-is-piped-to-a-program-or-if-program-run