# Access in-meeting user information

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> The code on this page works with either the **default UI** or the **custom UI**.

After joining a meeting, access information for each meeting participant through `IMeetingParticipantsController` and `IMeetingParticipantsCtrlEvent`.

Use one of several different IDs, each serving its own purpose, to access user information.

-   Customer key - A developer-supplied identifier that may be passed in through the `JoinParam`, specifically `JoinParam4NormalUser::customer_key` or `JoinParam4WithoutLogin::customer_key` to join a meeting.
-   User ID - A nonpersistent, unique per-user identifier assigned by Zoom for the current meeting. If a user leaves and rejoins the same meeting, they get a new user ID assigned each time they join. This is also reassigned when switching between the main meeting and breakout rooms.
-   Persistent ID - A per-user identifier assigned by Zoom for the current meeting and all submeetings, such as breakout rooms. This per-user identifier will not be reassigned in the same meeting or submeeting, but users in different meetings may have the same ID value.
-   Participant ID - A unique per-user identifier assigned by Zoom to a user's account. This persists across all meetings for an account. You can't access this ID through the macOS SDK, but can retrieve it through the REST API.

When a user joins a meeting, get their `IUserInfo` object.

```cpp
void ZMSDKWindow::InitParticipantEvents(ZOOM_SDK_NAMESPACE::IMeetingService* meetingService)
{
    if (!meetingService)
        return;
    m_participantsCtrl = meetingService->GetMeetingParticipantsController();
    if (!m_participantsCtrl)
        return;
    m_participantsCtrl->SetEvent(this);
}
void ZMSDKWindow::onUserJoin(ZOOM_SDK_NAMESPACE::IList<unsigned int>* lstUserID,
                             const zchar_t* /*strUserList*/)
{
    if (!lstUserID || !m_participantsCtrl)
        return;
    for (int i = 0; i < lstUserID->GetCount(); ++i)
    {
        unsigned int userID = lstUserID->GetItem(i);
        ZOOM_SDK_NAMESPACE::IUserInfo* userInfo =
            m_participantsCtrl->GetUserByUserID(userID);
        if (userInfo)
        {
            const zchar_t* userName = userInfo->GetUserName();
            unsigned int joinedUserID = userInfo->GetUserID();
        }
    }
}
```

Use the `IUserInfor` to access data specific to that user.

Get the customer key.

```cpp
userInfo->GetCustomerKey();
```

Get the user's avatar picture path, if available.

```cpp
userInfo->GetAvatarPath();
```

Get the user ID.

```cpp
userInfo->GetUserID();
```

Get the username.

```cpp
userInfo->GetUserName();
```

Get the persistent ID.

```cpp
userInfo->GetPersistentId();
```

Each user in a meeting or webinar has a role assigned to one of these values under `UserRole`.

-   `USERROLE_NONE` - No role has been assigned.
-   `USERROLE_HOST` - The host of the current meeting or webinar.
-   `USERROLE_COHOST` - A co-host of the current meeting or webinar.
-   `USERROLE_PANELIST` - A panelist in the current meeting or webinar.
-   `USERROLE_BREAKOUTROOM_MODERATOR` - The breakout room moderator.
-   `USERROLE_ATTENDEE` - An attendee of the current meeting or webinar.

Get the user’s role in the current meeting.

```cpp
userInfo->GetUserRole();
```

Determine whether a given user is the current user.

```cpp
userInfo->IsMySelf();
```

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