tencent cloud

// `selectedMsg` is the selected message to be deleted.
[[V2TIMManager sharedInstance] deleteMessageFromLocalStorage:selectedMessage
                                                        succ:^{
    NSLog(@"Local message deleted successfully");
} fail:^(int code, NSString *msg) {
    NSLog(@"Failed to delete the local message, code: %d, desc: %@", code, msg);
}];

// `selectedMessageList` is the list of selected messages to be deleted.
NSArray *selectedMessageList = @[selectedMessage1, selectedMessage2];
[[V2TIMManager sharedInstance] deleteMessages:selectedMessageList
                                        succ:^{
    NSLog(@"Messages deleted from the cloud successfully");
} fail:^(int code, NSString *desc) {
    NSLog(@"Failed to delete the messages from the cloud, code: %d, desc: %@", code, desc);
}];

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_;
};

// `messageList` is the list of selected messages to be deleted.
auto callback = new Callback;
callback->SetCallback(
    [=]() {
        // Messages deleted from the cloud successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Failed to delete the messages from the cloud
        delete callback;
    });

V2TIMManager::GetInstance()->GetMessageManager()->DeleteMessages(messageList, callback);