tencent cloud

[V2TIMManager.sharedInstance getConversation:@"conversationID" // ID of the conversation to be queried
                                        succ:^(V2TIMConversation *conv) {
    // The conversation obtained successfully. The `V2TIMConversation` object was returned.
} 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 conversationID = u8"conversationID";

auto callback = new ValueCallback<V2TIMConversation>{};
callback->SetCallback(
    [=](const V2TIMConversation& conversation) {
        // Obtained the conversation successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Failed to obtain the conversation
        delete callback;
    });

V2TIMManager::GetInstance()->GetConversationManager()->GetConversation(conversationID, callback);

[V2TIMManager.sharedInstance getConversationList:@[@"convID1", @"convID2"] // List of IDs of the conversations to be queried
                                            succ:^(NSArray<V2TIMConversation *> *list) {
    // Conversations obtained successfully. The `list` contains `V2TIMConversation` objects.
} 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_;
};

V2TIMStringVector conversationIDList;
conversationIDList.PushBack(u8"conversationID1");
conversationIDList.PushBack(u8"conversationID2");

auto callback = new ValueCallback<V2TIMConversationVector>{};
callback->SetCallback(
    [=](const V2TIMConversationVector& conversationList) {
        // Obtained multiple conversations successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Failed to obtain multiple conversations
        delete callback;
    });

V2TIMManager::GetInstance()->GetConversationManager()->GetConversationList(conversationIDList, callback);