如何在 C++ 上制作全局键盘监听器？ (Mac OSX)

Question

I want to get global keyboard input for an application I am making which runs in the background.

Expected results include being able to print the character in the console when I press a keyboard key outside of the window that the application is running on (in this case, Terminal).

I have tries using ncurses.h and curses.h but they seem to have symbols which are not recognised by Xcode:

Undefined symbols for architecture x86_64:
  
  "_stdscr", referenced from:
      _main in main.o

  "_wgetch", referenced from:
      _main in main.o

ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Here's my code:

#include <ApplicationServices/ApplicationServices.h>
#include <CoreGraphics/CoreGraphics.h>
#include <CoreFoundation/CoreFoundation.h>
#include <stdio.h>
#include <ncurses.h>
#include <iostream>
#include <curses.h>

int main() {
    std::cout << getch();
    
}

Can anyone suggest a library contained in the OS X files that can help me? Or if possible, can anybody help me with figuring out how to get past the errors above?

edit

I am a second-time poster (my first one went wrong), please point out if I can improve this or if I should delete this question altogether.

Answer 1

You need to specifically link the library, ie:

c++ -oprogname progname.cpp -lcurses

However, this will only resolve the "Undefined symbols" errors; it won't get you a "global keyboard listener".