Executing Code for as long as

This is a discussion on Executing Code for as long as within the C++ Programming forums, part of the General Programming Boards category; Hi I was wondering how I could make a program that executes a piece of code for as long as ...

  1. #1
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    Smile Executing Code for as long as

    Hi

    I was wondering how I could make a program that executes a piece of code for as long as a key is being touched?

    So for example:

    Code:
    while A is pressed down
    cout<<"You are typing A"<<endl;
    With the input of A, the output would be "you are typing A".

    I can't use
    Code:
    std::string key;
    while(1){
    cin >> key;
    if (key == "a"){
    cout<<"You are typing A"<<endl;
    }
    since the "cin" would require I press Enter/Return.


    When I type text on my computer, the keyboard will output the letter "a" as I type it.
    I need something similar to that - which doesn't require Enter/Return.

    Thanks in advance

  2. #2
    Registered User NeonBlack's Avatar
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    There is no portable way to do this, so it depends which OS you want to run it on. The easiest ways to do it on Windows and Linux are probably conio.h and curses, respectively.
    I copied it from the last program in which I passed a parameter, which would have been pre-1989 I guess. - esbo

  3. #3
    Super Moderator VirtualAce's Avatar
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    The OP never mentioned portable code was one of his requirements. What OS are you using?

  4. #4
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    Hello, thanks for your answers!

    I am currently using Windows 6, Vista.
    I checked my Include folder, and did see conio.h

    How can I use it to do this?
    Thanks

  5. #5
    Registered User NeonBlack's Avatar
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    With a loop using kbhit() and getch(). Look up the documentation for these 2 functions.

    Also I should mention that there is a curses library for Windows called pdcurses, so if you ever might want to port to Linux or Apple, you might want to go that route.
    I copied it from the last program in which I passed a parameter, which would have been pre-1989 I guess. - esbo

  6. #6
    Registered User jeffcobb's Avatar
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    Or you can trap the keydown event and continue doing what you are doing until you get a keyup event (and it is your 'A' char or whatever). Different way to skin the cat, so so speak.
    C/C++ Environment: GNU CC/Emacs
    Make system: CMake
    Debuggers: Valgrind/GDB

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