英文:
How Set a Variable in Go Depending on OS
问题
我知道我可以将特定的go文件命名为_windows.go、_linux.go等，这样它们只会为特定的操作系统进行编译。
在没有在文件名中指定go操作系统的文件中，是否有一种方法可以根据go操作系统设置变量和/或常量？也许可以在一个case语句中实现吗？
英文:
I'm aware that I can name particular go files _windows.go, _linux.go, etc and that this will make them only compile for that particular operating system.
Within a file that doesn't have the go os specified in the filename, is there a way I can set a variable and/or constant within a file depending on the go os? Maybe in a case statement?
答案1
得分: 7
runtime.GOOS 是你的朋友。然而，请记住你不能基于它设置常量（尽管你可以将其复制到自己的常量中）- 只能在运行时设置变量。你可以在模块中使用 init() 函数，在程序启动时自动运行检测。
package main
import "fmt"
import "runtime"
func main() {
fmt.Println("this is", runtime.GOOS)
foo := 1
switch runtime.GOOS {
case "linux":
foo = 2
case "darwin":
foo = 3
case "nacl": // 这是 playground 显示的内容！
foo = 4
default:
fmt.Println("What os is this?", runtime.GOOS)
}
fmt.Println(foo)
}
英文:
runtime.GOOS is your friend. However, keep in mind that you can't set constants based on it (although you can copy it to your own constant) - only variables, and only in runtime. You can use an init() function in a module to run the detection automatically when the program starts.
package main
import "fmt"
import "runtime"
func main() {
fmt.Println("this is", runtime.GOOS)
foo := 1
switch runtime.GOOS {
case "linux":
foo = 2
case "darwin":
foo = 3
case "nacl": //this is what the playground shows!
foo = 4
default:
fmt.Println("What os is this?", runtime.GOOS)
}
fmt.Println(foo)
}
答案2
得分: 3
请看一下runtime.GOOS。
> GOOS 是运行程序的操作系统目标之一：darwin、freebsd、linux等等。
switch runtime.GOOS {
case "linux":
fmt.Println("Linux")
default:
fmt.Println(runtime.GOOS)
}
英文:
Take a look at runtime.GOOS.
> GOOS is the running program's operating system target: one of darwin,
> freebsd, linux, and so on.
switch runtime.GOOS {
case "linux":
fmt.Println("Linux")
default:
fmt.Println(runtime.GOOS)
}
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