c - 读取c中的删除按键

Question

我遇到了一些我不太清楚的事情。我无法从 MacBook Air 读取删除输入。我正在用 c 编写一个程序来读取输入，并使用了以下转义序列字符:

c='127'

我可以将变量 c 设置为十进制值 8，根据我的理解，这是退格转义序列。另外，在“终端”>“首选项”>“高级”中，我选中了启用删除以发送 Control-H 的复选框。

完成上述操作后，我可以读取输入设置 c 变量，如下所示:

c = '8'

<小时/>

这是我尝试从 MacBook 读取删除键的代码空气:

#include <stdio.h>

main() {
    /*  Copy program input to program output,
        replacing each tab by \t,
        each backspace by \b,
        and each backslas by \\.
        This makes tabs and backspaces visible in an unambiguous way.
    */

    int c;  // a variable for a character

    while((c = getchar()) != EOF) {
        if (c == '\t')
            printf("\\t");
        // check box found in:
        // Terminal>Preferences>Advanced>Delete sends Control-H
        // default setting DOES NOT send Control-H
        // The Delete key does not appear to work with the ascii decimal character value 127.
        if (c == '\127')
            printf("Print to the screen if Delete key is detected.");
        if (c == '\\')
            printf("\\\\");
        if (c != '\t')
            if (c != '\b')
                if (c != '\\')
                    putchar(c);             
    }
}

Answer 1

尝试以下代码，看看会发生什么:

#include <stdio.h>
#include <stdlib.h>

int
main() {
    int c;
    system("stty raw -echo");
    while (1) {
        c = getchar();
        if (c == 3) break;  // exits when Ctrl-C is pressed
        printf("pressed code: %d\r\n", c);
    }
    system("stty -raw echo");
    return 0;
}

希望这有帮助。