有没有办法检查外部数据是否通过管道传输到程序或程序是否独立运行？

Question

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 ?

Answer 1

POSIX具有isatty() ，而Visual C ++具有_isatty() ，如果文件描述符是终端或命令行，则两者都将返回true，例如isatty(fileno(stdin)) 。

Answer 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.