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Passive Keyboard Input

This is a discussion on Passive Keyboard Input within the C++ Programming forums, part of the General Programming Boards category; I have used cin to get keyboard input for variables, getch() for getting single keypress information, but all of those ...

  1. #1
    Registered User
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    Sep 2003
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    Passive Keyboard Input

    I have used cin to get keyboard input for variables, getch() for getting single keypress information, but all of those cause the computer to wait for a keypress. I would like to have some kind of getch() like function that not "pause" the program. I would find this very useful for real-time DOS games.

    -Zagaberoo

  2. #2
    Registered User hk_mp5kpdw's Avatar
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    If your compiler supports it, you may be able to use the kbhit function.
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
    -Christopher Hitchens

  3. #3
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    kbhit?

    what is kbhit? what header does it require? how is it used?

  4. #4
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    kbhit() question

    kbhit() is a nifty little function, but can you make it useful, like getch()? I would really like to make a real-time game and need some kind of passive keyboard input that does not "pause" my program. kbhit() is cool, but can you have it input to a char or string? If not, what function or other helpful thingy can I use?

    ***PROGRAM IS IN DOS***

    -Zagaberoo
    I am the Uber Noob

  5. #5
    and the hat of int overfl Salem's Avatar
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    Pointless poll closed, and threads merged
    Try to be more careful when posting

    It goes like this
    Code:
    // key pressed?
    if ( kbhit() ) {
      ch = getch();  // yes, read it
      msg[n++] = ch;
      msg[n] = '\0';  // add to line so far
      if ( ch == '\r' ) {  // end of line?
        process(msg);  // yes, figure out what it means
        n = 0;
      }
    }
    // do stuff which can't wait
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  6. #6
    Guest Sebastiani's Avatar
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    There is no portable way to do it. You have to rely on compiler-specific code. What compiler are you using?
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

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