如何检测时删除键是pssed键盘上$ P $？ [英] How to detect when the delete key is pressed on the keyboard?

问题描述

我想，当<大骨节病>删除键pressed一定的函数被调用。
我怎样才能做到这一点使用残培（）如果可能的话或其他一些嵌套的残培（）电话？

I want that when the Del key is pressed a certain function is called. How can I achieve that using getch() if possible or otherwise some nested getch() calls?

推荐答案

功能 _getch（）返回一个越狱的光标和页面控制键的值。对于键盘和功能键，也就是 0 其次是关键code，对于其他按键，它是 224 其次是关键code。

The function _getch() returns an "escaped" value for cursor and page control keys. For the keypad and the function keys, that is 0 followed by the key code, for other keys it is 224 followed by the key code.

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

#define ESC     27
#define ESC1    0
#define ESC2    224

int main()
{
    int d=-1, e=-1;
    printf("Press a key (Esc to quit)\n");
    do {
        d = _getch();  
        if (d == ESC1) {
            e = _getch();  
            printf("%d %d\n", d, e);
        } else if (d == ESC2) {
            e = _getch();  
            printf("%d %d\n", d, e);
        } else {
            printf("%d\n", d);
        }
    } while (d != ESC);
    return 0;
}

运行程序和pressing三个键删除，德尔（键盘），Esc键产生输出

Running the program and pressing three keys Delete, Del(keypad), Esc produces the output

Press a key (Esc to quit)
224 83
0 83
27

当然，数字锁定键必须关闭。

Of course, Numlock must be Off.

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