先上代码:
package main
import (
"fmt"
"reflect"
"unsafe"
)
func printAddr(format string, ptr interface{}) {
p := reflect.ValueOf(ptr).Pointer()
h := (*uintptr)(unsafe.Pointer(p))
fmt.Printf(format, *h)
}
func tostring(bs []byte) string {
return *(*string)(unsafe.Pointer(&bs))
}
func tobyte(s string) []byte {
return *(*[]byte)(unsafe.Pointer(&s))
}
func main() {
s := "hello,world!"
b := tobyte(s)
h := make([]byte, 30)
h = b[0:2]
d := tostring(h)
printAddr("字符串的地址:%x\n", &s)
printAddr("转换成[]byte的地址:%x\n", &b)
printAddr("修改后的[]byte地址:%x\n", &h)
printAddr("修改后[]byte转换成字符串的地址:%x\n", &d)
// 这样可以正常输出
fmt.Println(s, " b:", b, " h:", h, " d:", d)
// 这样就报错
//fmt.Println(s, " b:", b, " h:", h, " d:", d, s)
}
报错信息是:
panic: runtime error: slice bounds out of range
goroutine 1 [running]:
main.main()
D:/practice/src/studyGo/main.go:27 +0x47e