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How to define one callback function in one struct? #14

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@lonelywolf4git

I have one struct definition like this :

const LoginResultCallBack = FFI.Callback(REF.types.void, [REF.types.int, REF.types.uint, REF.refType(NET_DVR_DEVICEINFO_V30), REF.refType(REF.types.int)],
  (lUserID, dwResult, lpDeviceInfo, pUser) => {
    console.log('call back execute result is :' + lUserID)
  })
const NET_DVR_USER_LOGIN_INFO = StrucType(
  {
    sDeviceAddress: ArrayType(REF.types.byte, Constants.NET_DVR_DEV_ADDRESS_MAX_LEN),
    byUseTransport: REF.types.byte,
    wPort: REF.types.ushort,
    sUserName: ArrayType(REF.types.char, Constants.NET_DVR_LOGIN_USERNAME_MAX_LEN),
    sPassword: ArrayType(REF.types.char, Constants.NET_DVR_LOGIN_PASSWD_MAX_LEN),
    cbLoginResult: REF.refType('void')
  }
)

The param "cbLoginResult" type is callback function and I want to set it's value is LoginResultCallBack, how to set it value? thanks!

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