CGO数组处理

Question

大佬们求助!
问题一：数组取值不全，只能取得第一条；
问题二：users.name转换成string。

package main

/*
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

typedef struct User{
   char name[64];
   int uid;
}User;

static struct User *
getUsers(){
   static struct User users[3] = {{"admin",1},{"kaha",2},{"dddd",3}};
   return users;
}
*/
import "C"
import (
    "fmt"
    "reflect"
)

func main() {
    users := C.getUsers()
    fmt.Println(reflect.TypeOf(users.name))

    fmt.Println(users.name)
}

Answer 1

package main

/*
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

typedef struct User{
   char *name;
   int     uid;
}User;

typedef struct Users{
    struct User items[3];
}Users;

static struct Users *
getUsers(){
        //static static User user1,user2,user3
           static struct Users *p;
           static struct Users users;
        users.items[0].name = "admin1";
        users.items[0].uid = 1;
        users.items[1].name = "admin2";
        users.items[1].uid = 2;
        users.items[2].name = "admin3";
        users.items[2].uid = 3;
        p = &users;

           return(p);
}
*/
import "C"
import (
    "fmt"
)

func main() {
    ptr := C.getUsers()
    for k, v := range ptr.items {
        fmt.Println(k, C.GoString((*C.char)((C.User)(v).name)))
    }
}

Answer 2

内存是相同的，强制转换内存就行，但是不够工程化

func main() {
    users := C.getUsers()
    fmt.Println(reflect.TypeOf(users.name))

    fmt.Println(users.name)

    // 转换成string，直接使用内存强制转换
    type Item struct {
        Name [64]byte
        Uid  int32
    }
    type Items [3]Item
    m := (*Items)(unsafe.Pointer(users))
    fmt.Println(m)

    for _, v := range m {
        fmt.Println(string(v.Name[:]), v.Uid)
    }
}