tencent cloud

[[V2TIMManager sharedInstance] getTotalUnreadMessageCount:^(UInt64 totalCount) {
    // Obtained successfully. `totalCount` is the total unread message count of all conversations.
    // Update the unread count on the UI
} 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_;
};

auto callback = new ValueCallback<uint64_t>{};
callback->SetCallback(
    [=](const uint64_t& count) {
        // Got the total unread count of all conversations successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Failed to get the total unread count of all conversations
        delete callback;
    });

V2TIMManager::GetInstance()->GetConversationManager()->GetTotalUnreadMessageCount(callback);

// Add a conversation listener
[[V2TIMManager sharedInstance] addConversationListener:self];

// Received a notification of a change in the total unread count of all conversations
- (void)onTotalUnreadMessageCountChanged:(UInt64)totalUnreadCount {
    // `totalUnreadCount` is the total unread count.
}

class ConversationListener final : public V2TIMConversationListener {
public:
    /**
     * Notification of the change of the total unread message count of all conversations (supported by 5.3.425 or later)
     *
     * @note
     *  - The total unread message count excludes the unread message count of Do-Not-Disturb conversations (conversations whose message receiving option is
     *  V2TIM_NOT_RECEIVE_MESSAGE or V2TIM_RECEIVE_NOT_NOTIFY_MESSAGE).
     */
    void OnTotalUnreadMessageCountChanged(uint64_t totalUnreadCount) override {
        // Received a notification of a change in the total unread count of all conversations
    }
    // Other member functions...
};

// Add a conversation event listener. Keep `conversationListener` valid before the listener is removed to ensure event callbacks are received.
ConversationListener conversationListener;
V2TIMManager::GetInstance()->GetConversationManager()->AddConversationListener(&conversationListener);

V2TIMConversationListFilter *filter = [[V2TIMConversationListFilter alloc] init];
filter.type = V2TIM_GROUP;
filter.conversationGroup = @"conversation_group";
filter.markType = V2TIM_CONVERSATION_MARK_TYPE_STAR;

[[V2TIMManager sharedInstance] getUnreadMessageCountByFilter:filter succ:^(UInt64 totalUnreadCount) {
    [self appendString:[NSString stringWithFormat:@"getUnreadMessageCountByFilter success totalUnreadCount:%llu", totalUnreadCount]];
} fail:^(int code, NSString *desc) {
    [self appendString:[NSString stringWithFormat:@"getUnreadMessageCountByFilter failed"]];
}];

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_;
};

auto callback = new ValueCallback<uint64_t>{};
callback->SetCallback(
    [=](const uint64_t& count) {
        // Got the total unread count successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Failed to get the total unread count
        delete callback;
    });

V2TIMConversationListFilter filter;
filter.type = V2TIM_GROUP;
filter.conversationGroup = "conversation_group";
filter.markType = V2TIM_CONVERSATION_MARK_TYPE_STAR;

V2TIMManager::GetInstance()->GetConversationManager()->GetUnreadMessageCountByFilter(filter, callback);

// Add a conversation listener
[[V2TIMManager sharedInstance] addConversationListener:self];

// Register the listening for the changes of the total unread message count under specified filters
V2TIMConversationListFilter *filter = [[V2TIMConversationListFilter alloc] init];
filter.type = V2TIM_GROUP;
filter.conversationGroup = @"conversation_group";
filter.markType = V2TIM_CONVERSATION_MARK_TYPE_STAR;
[[V2TIMManager sharedInstance] subscribeUnreadMessageCountByFilter:filter];

// Notification on the change of the total unread message count under specified filters
- (void)onUnreadMessageCountChangedByFilter:(V2TIMConversationListFilter *)filter totalUnreadCount:(UInt64)totalUnreadCount {
    // `filter` indicates the filter conditions. `totalUnreadCount` indicates the total unread message count.
}