CGO return VM data

cgovm.go

package main

//#include <stdio.h>
//#include <strings.h>
//#include <stdlib.h>
/*
typedef struct {
    unsigned char *data;
    int data_len;
} Result;

Result *foo() {
    Result *r = malloc(sizeof(Result));

    r->data = (unsigned char *)malloc(10);
    r->data_len = 10;

    memset(r->data, 0, 10);

    r->data = (unsigned char *)strdup("xxx123");
    r->data_len = 6;

    return r;
}
*/
import "C"

import (
	"fmt"
	"unsafe"
)

func main() {
	result := C.foo()

	str := (*C.char)(unsafe.Pointer(result.data))
	fmt.Println("As string:", C.GoString(str))

	byts := C.GoBytes(unsafe.Pointer(result.data), result.data_len)
	fmt.Println("As bytes:", byts)

	// Free r->data
	C.free(unsafe.Pointer(result.data))
	// Free Result *r
	C.free(unsafe.Pointer(result))
}