在控制台应用程序中检测按键？

Question

I need to detect a keypress in a console application, without prompting the user. Basically, my app is normally a daemon that listens to a special input device, but i need to simulate it on a dev box using the keyboard in interactive mode. How can I do this? - Im on a Linux system.

Answer 1

如果在等待输入时不能阻塞，则可以使用例如select来检查STDIN_FILENO文件描述符是否已准备好读取，如果可以，则可以使用常规输入函数（ scanf ， fgets std::getline等） ）。

Answer 2

You check this answer which explains how to read from the input events ( usually /dev/input/event0 )

Or directly check the answer's source :

Credits do not go to me, this code is taken from the Ventriloctrl hack to get keystrokes. http://public.callutheran.edu/~abarker/ventriloctrl-0.4.tar.gz

Answer 3

This text explaines hw to do such a thing. http://thc.org/papers/writing-linux-kernel-keylogger.txt