使用curses.h从键盘获取字符

我正在尝试使用curses.h 从键盘获取一个字符。 这是我的来源（get_char_example.c）：

#include <curses.h>
#include <stdio.h>

int main(void)
{
    char ch;

    printf("Enter a character: ");
    ch = getch();
    printf("\nIts ASCII code is %d\n", ch);

    return 0;
}

我使用以下命令进行编译：

gcc get_char_example.c -o get_char_example

我收到以下错误：

/tmp/ccjaXwRU.o：在函数“main”中：

get_char_example.c:(.text+0x1c): undefined reference to `stdscr'
get_char_example.c:(.text+0x24): undefined reference to `wgetch'
collect2: error: ld returned 1 exit status

使用：海湾合作委员会（GCC）7.2.0 Arch Linux 4.13.9-1-ARCH

提前致谢！

这是一个链接器错误（请参阅this https://stackoverflow.com/questions/1513417/why-is-curses-on-linux-giving-me-following-error，几乎是重复的）。ncurses众所周知pkg 配置 https://www.freedesktop.org/wiki/Software/pkg-config/（这会在需要时提供更多依赖项），因此尝试使用以下命令进行编译：

 gcc -Wall -Wextra -g \
    $(pkg-config --cflags ncurses) \
    get_char_example.c \
    $(pkg-config --libs ncurses)

^{You want to Invoke GCC https://gcc.gnu.org/onlinedocs/gcc/Invoking-GCC.html with all warnings and debug info; you would use GDB https://sourceware.org/gdb/current/onlinedocs/gdb/, perhaps under emacs or with ddd, for debugging.}

Even better, use some build automation https://en.wikipedia.org/wiki/Build_automation tool (like make https://www.gnu.org/software/make or ninja). With GNU make https://www.gnu.org/software/make/manual/html_node/index.html take inspiration from this https://stackoverflow.com/a/20146082/841108 to write your Makefile https://en.wikipedia.org/wiki/Makefile (where tab-s are significant).

在我的 Debian Sid 上，pkg-config --cflags ncurses gives -D_GNU_SOURCE -D_DEFAULT_SOURCE and pkg-config --libs ncurses gives -lncurses -ltinfo，所以只需链接-lncurses is not足够了（这就是为什么this https://stackoverflow.com/questions/1513417/why-is-curses-on-linux-giving-me-following-error与 2017 年 11 月的今天并不完全重复；几年前简单地链接-lncurses已经足够了，今天还不够）。

Use pkg-config --list-all查找所有已知的包和库pkg 配置 https://www.freedesktop.org/wiki/Software/pkg-config/;开发时your图书馆还考虑提供一些.pc为其归档。

顺便说一句，你的程序应该首先初始化initscr并使用printw; Read Ncurses 编程方法 http://www.tldp.org/HOWTO/NCURSES-Programming-HOWTO/即使它有点旧了。

Notice also that using ASCII in the 21^st century is obsolete. Programs and computers use UTF-8 everywhere http://utf8everywhere.org/, and this has profound consequences you should be aware of (since an UTF-8 https://en.wikipedia.org/wiki/UTF-8 character can span several bytes). My French keyboard has keys for ², §, € and é (even with American keyboards your could paste them) and none of these are in ASCII. Consider also using some UTF-8 library like libunistring https://www.gnu.org/software/libunistring/manual/libunistring.html.