cgo中内置函数

  1. 1. 概述
  2. 2. 示例

cgo中内置函数

1. 概述

cgo中有以下内置函数

// Go string to C string
// The C string is allocated in the C heap using malloc.
// It is the caller's responsibility to arrange for it to be
// freed, such as by calling C.free (be sure to include stdlib.h
// if C.free is needed).
func C.CString(string) *C.char

// Go []byte slice to C array
// The C array is allocated in the C heap using malloc.
// It is the caller's responsibility to arrange for it to be
// freed, such as by calling C.free (be sure to include stdlib.h
// if C.free is needed).
func C.CBytes([]byte) unsafe.Pointer

// C string to Go string
func C.GoString(*C.char) string

// C data with explicit length to Go string
func C.GoStringN(*C.char, C.int) string

// C data with explicit length to Go []byte
func C.GoBytes(unsafe.Pointer, C.int) []byte

2. 示例

CString
注意:必须释放内存
由于使用了free函数,所以需要#include <stdlib.h>头文件。

sDVRIP := C.CString(ip)
defer C.free(unsafe.Pointer(sDVRIP))

CBytes
注意:必须释放内存
由于使用了free函数,所以需要#include <stdlib.h>头文件。

sAddress := C.CBytes(address)
defer C.free(sAddress)

GoString
指针时

// char* ip = "192.168.1.168"
sAddress := C.GoString(ip)

数组时

// char ip[20] = "192.168.1.168"
sAddress := C.GoString(&ip[0])

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文章标题:cgo中内置函数

本文作者:kaisawind

发布时间:2020-10-24, 11:31:12

最后更新:2020-12-04, 10:18:58

原始链接:https://kaisawind.gitee.io/2020/10/24/2020-10-24-cgo-internal-func/

版权声明: "署名-非商用-相同方式共享 4.0" 转载请保留原文链接及作者。

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