Go - 访问C动态分配数组

Go - 访问C动态分配数组

使用 unsafe 结合类型转换 *(*[6]C.type) 可将C动态分配数组转换为go识别固定数组类型.

示例

*(*[6]C.uint64_t)(unsafe.Pointer(ptr)) 转换指针ptr 为固定数组类型:

package main

/*
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
void* alloc_int(void)
{
	uint64_t *p = (void *)malloc(sizeof(uint64_t) * 6);
	for (int i = 0; i < 6; i ++) {
		p[i] = i + 60;
	}
	return (void *)p;
}
*/
import "C"
import (
	"unsafe"
	"fmt"
)

func main() {
	ptr := C.alloc_int()
	v := *(*[6]C.uint64_t)(unsafe.Pointer(ptr))
	for _, a := range v {
		fmt.Printf("%v\n", a)
	}
	fmt.Printf("len: %v\n", len(v));
	fmt.Printf("0: %v\n", uint64(v[0]));
}

go build carray.go 输出结果:

# ./carray 
60
61
62
63
64
65
len: 6
0: 60