tencent cloud

[[V2TIMManager sharedInstance] getTotalUnreadMessageCount:^(UInt64 totalCount) {
    // 获取成功，totalCount 为所有会话的未读消息总数
    // 更新 UI 上的未读数
} fail:^(int code, NSString *desc) {
    // 获取失败
}];

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) {
        // 获取所有会话的未读总数成功
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // 获取所有会话的未读总数失败
        delete callback;
    });

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

// 添加会话监听器
[[V2TIMManager sharedInstance] addConversationListener:self];

// 收到所有会话的未读总数变更通知
- (void)onTotalUnreadMessageCountChanged:(UInt64)totalUnreadCount {
    // totalUnreadCount 为未读消息总数
}

class ConversationListener final : public V2TIMConversationListener {
public:
    /**
     * 会话所有会话的未读总数变更通知（5.3.425 及以上版本支持）
     *
     * @note
     *  - 未读总数会减去设置为免打扰的会话的未读数，即消息接收选项设置为
     *  V2TIM_NOT_RECEIVE_MESSAGE  or V2TIM_RECEIVE_NOT_NOTIFY_MESSAGE 的会话。
     */
    void OnTotalUnreadMessageCountChanged(uint64_t totalUnreadCount) override {
        // 收到所有会话的未读总数变更通知
    }
    // 其他成员函数 ...
};

// 添加会话事件监听器，注意在移除监听器之前需要保持 conversationListener 的生命期，以免接收不到事件回调
ConversationListener conversationListener;
V2TIMManager::GetInstance()->GetConversationManager()->AddConversationListener(&conversationListener);

V2TIMConversationListFilter *filter = [[V2TIMConversationListFilter alloc] init];
filter.type = V2TIM_C2C; //拉取单聊会话
// filter.type = V2TIM_GROUP; //拉取群聊会话

[[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_;
};

V2TIMConversationListFilter filter;
filter.type = V2TIM_C2C;  // 拉取单聊会话
// filter.type = V2TIM_GROUP;  // 拉取群聊会话
auto callback = new ValueCallback<uint64_t>{};
callback->SetCallback(
    [=](const uint64_t& count) {
        // 获取部分会话的未读总数成功
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // 获取部分会话的未读总数失败
        delete callback;
    });
V2TIMManager::GetInstance()->GetConversationManager()->GetUnreadMessageCountByFilter(filter, callback);