JavaScript calls C++ code with pointer to struct

[lilianglaoding]

hello, everyone, I want to call C++ code in JavasSript. After I called the initialize funtion, the callback funtion is a parameter of the initilialize funtion, the callback fution will be registered, and after some operations, the C++ code will call the callback funtion the definition is below:
C++ Struct definition:
`#define MAX_EXTRA_MESSAGE_LEN 1024

struct Message {
unsigned int verison;
int sessionId;
unsigned int messageId;
unsigned int errorCode;
char extraMessage[MAX_EXTRA_MESSAGE_LEN];
union {
DistributedBundle bundle;
struct {
unsigned int dataSize;
void data;
};
};
};
int Honor_Distributed_Initialize(int appId, const char* processName, int nameLen, DISTRIBUTED_PROC lpfnProc)
int Honor_Distributed_Initialize(int appId,const char* processName,int nameLen,DISTRIBUTED_PROC lpfnProc)
`

callback definition:
typedef void (* DISTRIBUTED_PROC)(const Message* msg);

my code is below:
`
const distributedBundle = ref.types.void
const distributedBundlePtr = ref.refType(distributedBundle)

const distributedMessage = Struct({
'version': ref.types.uint,
'sessionId': ref.types.int,
'messageId': ref.types.uint,
'errorCode': ref.types.uint,
'extraMesssage': refArray(ref.types.char, 1024),
// 'bundleData': messageUnion,
'bundle': distributedBundlePtr,
})
const distributedMessagePtr = ref.refType(distributedMessage)
distributedServiceLibrary = ffi.Library(resolvePath('build-win/dll/DistributedKit.dll'), {
'Honor_Distributed_Initialize': ['int', ['int', 'string', 'int', 'pointer']],
......

const callback = ffi.Callback('void', [distributedMessagePtr], function(messageInfo: any) {
Logger.info('[distributed service]: ffi.Callback called')
messageInfo.type = distributedMessagePtr
// const msg = ref.alloc(distributedMessagePtr, messageInfo)
Logger.info([distributed service]: version ${messageInfo.deref().version})
Logger.info([distributed service]: sessionID ${messageInfo.deref().sessionId})
Logger.info([distributed service]: messageId ${messageInfo.deref().messageId})
I registered the callback below:const initServiceResult = distributedServiceLibrary.Honor_Distributed_Initialize(appid, packageName, packageLen, callback)`

The Question is: when the callback is called, I can not get data from messageInfo, and the logger is "version undefined, sessionID undefine...", so how to code the callback funtion? thanks.