getch();

This is a discussion on getch(); within the A Brief History of Cprogramming.com forums, part of the Community Boards category; What will getch() return for these keys: Left Arrow Right Arrow Up Arrow Down Arrow ESC F1-12 Tab Enter Shift ...

  1. #1
    Banned frenchfry164's Avatar
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    getch();

    What will getch() return for these keys:

    Left Arrow
    Right Arrow
    Up Arrow
    Down Arrow
    ESC
    F1-12
    Tab
    Enter
    Shift
    CTRL
    ALT
    Backspace

    like in this

    switch (getch())
    {
    case LEFT ARROW:
    blah blah
    break;
    }

  2. #2
    Disagreeably Disagreeable
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    Why don't you enter this in the compiler and check it for yourself:

    Code:
    #include <iostream.h>
    #include <conio.h>
    
    int main()
    {
       char ch = getch();
    
       cout << ch << endl;
       return 0;
    }
    Most if not all of those keys will cause the program to not display anything. This is because they do not have corresponding ASCII codes.

    Of course, ya never know. A few might bring some unexpected results...

  3. #3
    A Banana Yoshi's Avatar
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    Red face

    Up, down, left, and right arrow shows 0 in my ASCII codes...
    Yoshi

  4. #4
    Disagreeably Disagreeable
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    Well, there ya have it.

  5. #5
    Flash Animator, OF DOOOOM bluehead's Avatar
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    up is 72,
    down is 80,
    right is 77,
    left is 75

    If this is what you're looking for, no thanx needed. if not, Then i don't know
    Code:
    #if _emo
      #define stereo_type_i_dislike
    #endif

  6. #6
    Banned frenchfry164's Avatar
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    Okay, I got it to do letters. K = left H = up P = down M = right

    Now when I press an arrow it returns zero the first time I press it, then it returns the letter. WTF? Why does it do this, and can I override it doing that? Or do I need to just tell the user to press left twice or down twice to move.

  7. #7
    Confused Magos's Avatar
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    I think it has something to do with upper and lower bytes... Well, I don't know so I should probably just shut up .
    MagosX.com

    Give a man a fish and you feed him for a day.
    Teach a man to fish and you feed him for a lifetime.

  8. #8
    Unregistered
    Guest
    hi

    simply use this code:

    x=getch();
    if(x==0) // is special key else is normal key (a, b, RETURN, ESC ....)
    y=getch(); // number of y is the key pressed (up, down, F1, F2...)

    i hope this helps.

    bye


    PLEASE HELP ME WITH MY MOUSE IN 800x600 24 BIT MODE!!!

  9. #9
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    You can try this out if you like. A sort of in the works project.

    #include <stdio.h>
    #include <conio.h>

    #define KEYBOARD 0x60
    #define KCONTROL 0x61
    #define KINTCONTROL 0x20

    #define LARROW 75
    #define RARROW 77

    // continue from there

    #define F_1 59
    #define F_2 60

    // continue from there

    int key;

    int getKey(void);

    int main()
    {

    getKey();

    switch(key)
    {
    case LARROW: printf("\nleft arrow key pressed.");
    break;
    case F_1: printf("\nF1 key pressed.");
    break;
    // and so on

    }

    return 0;
    } // end main

    int getKey(void)
    {
    printf("\nPress a key: ");
    key = getch();

    _asm
    {
    sti
    in al,KEYBOARD
    xor ah,ah
    mov key,ax
    in al,KCONTROL
    or al,82h
    out KCONTROL,al
    and al,7fh
    out KCONTROL,al
    mov al,20h
    out KINTCONTROL,al
    }
    return key;
    }

    I hope there are no typoes as this was rushed.
    I haven't used a compiler in ages, so please be gentle as I try to reacclimate myself. :P

  10. #10
    Banned frenchfry164's Avatar
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    thats okay, I'm just going to make it loop the getch() again if it's zero. That way it don't flash, because the character and the HP/MP flash everytime you take a step for some reason.

  11. #11
    Casual Visitor
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    Ah, A RPG hound then? A 3D game?
    I haven't used a compiler in ages, so please be gentle as I try to reacclimate myself. :P

  12. #12
    mov.w #$1337,D0 Jeremy G's Avatar
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    for any one who cares.

    did this, it gets the arrow keys and does *something* depending on which arrow key. Pretty simple, should be easy to modify for your use.

    //code:
    void cursor()
    {
    // getch();

    int c = 1;
    int ch = 0;

    while (ch != c)
    {
    ch = getch();

    // cout << ch << endl;
    if(ch == 72) // if UP
    cout << "^" << endl;
    if(ch == 80) // if Down
    cout << "d" << endl;
    if(ch == 75) // if left
    cout << "<" << endl;
    if(ch == 77) // if right;
    cout << ">" << endl;
    }

    }
    // ^^ end code!
    c++->visualc++->directx->opengl->c++;
    (it should be realized my posts are all in a light hearted manner. And should not be taken offense to.)

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