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[[V2TIMManager sharedInstance] getGroupMembersInfo:@"groupA" memberList:@[@"user1"] succ:^(NSArray<V2TIMGroupMemberFullInfo *> *memberList) {
    // Obtained successfully
} fail:^(int code, NSString *desc) {
    // Failed to obtain
}];

template <class T>
class ValueCallback final : public V2TIMValueCallback<T> {
public:
    using SuccessCallback = std::function<void(const T&)>;
    using ErrorCallback = std::function<void(int, const V2TIMString&)>;

    ValueCallback() = default;
    ~ValueCallback() override = default;

    void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
        success_callback_ = std::move(success_callback);
        error_callback_ = std::move(error_callback);
    }

    void OnSuccess(const T& value) override {
        if (success_callback_) {
            success_callback_(value);
        }
    }
    void OnError(int error_code, const V2TIMString& error_message) override {
        if (error_callback_) {
            error_callback_(error_code, error_message);
        }
    }

private:
    SuccessCallback success_callback_;
    ErrorCallback error_callback_;
};

V2TIMString groupID = "groupA";
V2TIMStringVector memberList;
memberList.PushBack("userA");
memberList.PushBack("userB");

auto callback = new ValueCallback<V2TIMGroupInfoVector>{};
callback->SetCallback(
    [=](const V2TIMGroupMemberFullInfoVector& groupMemberFullInfoList) {
        // Obtained successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Failed to obtain
        delete callback;
    });

V2TIMManager::GetInstance()->GetGroupManager()->GetGroupMembersInfo(groupID, memberList, callback);

V2TIMGroupMemberFullInfo *memberFullInfo = [[V2TIMGroupMemberFullInfo alloc] init];
// Specify a group member
memberFullInfo.userID = @"user1";
// Set the `nameCard` value to be modified
memberFullInfo.nameCard = @"user1_namecard";
// Set a group member custom field
memberFullInfo.customInfo = @{@"member_key1" : [@"value1" dataUsingEncoding:NSUTF8StringEncoding]};
[[V2TIMManager sharedInstance] setGroupMemberInfo:@"groupA" info:memberFullInfo succ:^{
    // Modified successfully
} fail:^(int code, NSString *desc) {
    // Failed to modify
}];

class Callback final : public V2TIMCallback {
public:
    using SuccessCallback = std::function<void()>;
    using ErrorCallback = std::function<void(int, const V2TIMString&)>;

    Callback() = default;
    ~Callback() override = default;

    void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
        success_callback_ = std::move(success_callback);
        error_callback_ = std::move(error_callback);
    }

    void OnSuccess() override {
        if (success_callback_) {
            success_callback_();
        }
    }
    void OnError(int error_code, const V2TIMString& error_message) override {
        if (error_callback_) {
            error_callback_(error_code, error_message);
        }
    }

private:
    SuccessCallback success_callback_;
    ErrorCallback error_callback_;
};

// Specify a group member
V2TIMGroupMemberFullInfo info;
info.userID = "userA";
// Set the `nameCard` value to be modified
info.nameCard = "userA_namecard";
info.modifyFlag = V2TIMGroupMemberInfoModifyFlag::V2TIM_GROUP_MEMBER_INFO_MODIFY_FLAG_NAME_CARD;
// Set a group member custom field
V2TIMCustomInfo customInfo;
std::string str{u8"value1"};
customInfo.Insert("member_key1", {reinterpret_cast<const uint8_t*>(str.data()), str.size()});
info.customInfo = customInfo;
info.modifyFlag |= V2TIMGroupMemberInfoModifyFlag::V2TIM_GROUP_MEMBER_INFO_MODIFY_FLAG_CUSTOM_INFO;

auto callback = new Callback;
callback->SetCallback(
    [=]() {
        // Modified successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Failed to modify
        delete callback;
    });

V2TIMManager::GetInstance()->GetGroupManager()->SetGroupMemberInfo("userA", info, callback);