Go语言中捕获方向键输入：使用termbox-go实现跨平台终端交互

package main

import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    fmt.Println("Press a key...")
    in := bufio.NewReader(os.Stdin)
    b, err := in.ReadByte()
    if err != nil {
        fmt.Println("Error reading byte:", err)
        return
    }
    fmt.Println("Key code:", b, "Error:", err)
}

go get github.com/nsf/termbox-go

package main

import (
    "fmt"
    "log"
    "os"
    "time"

    "github.com/nsf/termbox-go/termbox"
)

func main() {
    // 1. 初始化 termbox
    // 这会将终端切换到原始模式，并准备接收事件
    err := termbox.Init()
    if err != nil {
        log.Fatalf("Failed to initialize termbox: %v", err)
    }
    // 2. 确保程序退出时恢复终端状态
    defer termbox.Close()

    // 3. 清空终端并显示初始信息
    termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
    printString(0, 0, "Press Up/Down arrow keys or 'q' to quit.", termbox.ColorDefault, termbox.ColorDefault)
    termbox.Flush()

    // 4. 事件循环：持续监听键盘事件
    eventQueue := make(chan termbox.Event)
    go func() {
        for {
            eventQueue <- termbox.PollEvent()
        }
    }()

    for {
        select {
        case ev := <-eventQueue:
            if ev.Type == termbox.EventKey {
                switch ev.Key {
                case termbox.KeyArrowUp:
                    termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
                    printString(0, 0, "Up arrow pressed!", termbox.ColorGreen, termbox.ColorDefault)
                    termbox.Flush()
                case termbox.KeyArrowDown:
                    termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
                    printString(0, 0, "Down arrow pressed!", termbox.ColorBlue, termbox.ColorDefault)
                    termbox.Flush()
                case termbox.KeyCtrlC, termbox.KeyEsc: // Ctrl+C or Esc
                    fmt.Println("\nExiting...")
                    return
                case termbox.KeyChar:
                    if ev.Ch == 'q' || ev.Ch == 'Q' {
                        fmt.Println("\nExiting...")
                        return
                    }
                    // 打印其他普通字符
                    termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
                    printString(0, 0, fmt.Sprintf("Key pressed: %c (code: %d)", ev.Ch, ev.Ch), termbox.ColorWhite, termbox.ColorDefault)
                    termbox.Flush()
                }
            }
        case <-time.After(time.Second):
            // 可以添加一些周期性任务或超时处理
        }
    }
}

// 辅助函数：在指定位置打印字符串
func printString(x, y int, s string, fg, bg termbox.Attribute) {
    for i, r := range s {
        termbox.SetCell(x+i, y, r, fg, bg)
    }
}