问无法使用FFI将结构内部的字符串数组传递给C函数

EN

var ffi = require('ffi');
var ref=require('ref');
var ArrayType = require('ref-array');
var Struct = require('ref-struct');

var StringArray = ArrayType('string');
var myStructure=Struct({
'ulonglong' : ref.types.ulonglong,
'charptrptr' : StringArray,
'stringArr' : StringArray
});

var structObjNew=new myStructure();
structObjNew.ulonglong=123456;
structObjNew.charptrptr=["sample","ptrptr"]; 
structObjNew.stringArr=["sample1","ptrptr1"];

var libfactorial = ffi.Library('./stringArray', {
 'readArray': [ 'string', [ myStructurePtr]] //creating header definition 
});

var output=libfactorial.readArray(structObjNew.ref()); 

struct myStructure
 {
    unsigned long long ulonglong;
    char  **charptrptr;
    char stringArr[3][10];
 };
EXPORT char* readArray(struct myStructure *nameofstr) {
  printf("Value from first param from structure of type char**\n");
  printf("%s\n",nameofstr->charptrptr[0]);
  printf("%s\n",nameofstr->charptrptr[1]);

  printf("value form second param from structure of thype char[][]\n");
  printf("%s\n",nameofstr->stringArr[0]);
  printf("%s\n",nameofstr->stringArr[1]);
}