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Update ch2-03-cgo-types.md

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Alex Nguyen 2019-06-26 18:45:19 +07:00 committed by GitHub
parent 418c517845
commit f4a576cb46
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1 changed files with 16 additions and 19 deletions
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ch2-cgo/ch2-03-cgo-types.md
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@ -328,30 +328,27 @@ char *s = "Hello";
*/ */
import "C" import "C"
import ( import (
"reflect" "reflect"
"unsafe" "unsafe"
"fmt"
) )
func main() { func main() {
// chuyển đổi bằng reflect.SliceHeader // 通过 reflect.SliceHeader 转换
var arr0 []byte var arr0 []byte
var arr0Hdr = (*reflect.SliceHeader)(unsafe.Pointer(&arr0)) var arr0Hdr = (*reflect.SliceHeader)(unsafe.Pointer(&arr0))
arr0Hdr.Data = uintptr(unsafe.Pointer(&C.arr[0])) arr0Hdr.Data = uintptr(unsafe.Pointer(&C.arr[0]))
arr0Hdr.Len = 10 arr0Hdr.Len = 10
arr0Hdr.Cap = 10 arr0Hdr.Cap = 10
// chuyển đổi slice // 通过切片语法转换
arr1 := (*[31]byte)(unsafe.Pointer(&C.arr[0]))[:10:10] arr1 := (*[31]byte)(unsafe.Pointer(&C.arr[0]))[:10:10]
var s0 string
var s0Hdr = (*reflect.StringHeader)(unsafe.Pointer(&s0))
s0Hdr.Data = uintptr(unsafe.Pointer(C.s))
s0Hdr.Len = int(C.strlen(C.s))
var s0 string sLen := int(C.strlen(C.s))
var s0Hdr = (*reflect.StringHeader)(unsafe.Pointer(&s0)) s1 := string((*[31]byte)(unsafe.Pointer(C.s))[:sLen:sLen])
s0Hdr.Data = uintptr(unsafe.Pointer(C.s))
s0Hdr.Len = int(C.strlen(C.s))
sLen := int(C.strlen(C.s))
s1 := string((*[31]byte)(unsafe.Pointer(C.s))[:sLen:sLen])
} }
``` ```