在运行时使用字符串/变量访问常量

Accessing constants using strings / variables during runtime

我正在开发跨平台打字/按键模拟器。在此,我试图实现如下功能。

package main

import "fmt"
import "strings"

const (
    VK_A = 5
    VK_S = 14
    VK_D = 25
)

func main() {
    // Suppose, I got user input "a", and based on this,
    // i want to print the value of VK_A
    var userInput string = "a"
    var constToSelect string = "VK_" + strings.ToUpper(userInput)
    fmt.Println(constToSelect) // This string is VK_A
    // But how can i get 5 which is the value of VK_A
}

我需要这种功能,因为根据平台的不同,VK_A 有不同的值。对于 windows,它是 30,对于 darwin 它是 0x00。

你可以用地图查一下 https://blog.golang.org/maps

m = make(map[string]int)
m["VK_A"] = 5
value := m[constToSelect]

地图不是常量