tencent cloud

// V2TIMManager+Message.h
- (NSString *)sendMessage:(V2TIMMessage *)message
                 receiver:(NSString *)receiver
                  groupID:(NSString *)groupID
                 priority:(V2TIMMessagePriority)priority
           onlineUserOnly:(BOOL)onlineUserOnly
          offlinePushInfo:(V2TIMOfflinePushInfo *)offlinePushInfo
                 progress:(V2TIMProgress)progress
                     succ:(V2TIMSucc)succ
                     fail:(V2TIMFail)fail;

// V2TIMMessageManager
virtual V2TIMString SendMessage(
    V2TIMMessage& message,
    const V2TIMString& receiver,
    const V2TIMString& groupID,
    V2TIMMessagePriority priority,
    bool onlineUserOnly,
    const V2TIMOfflinePushInfo& offlinePushInfo,
    V2TIMSendCallback* callback);

// `msgID` returned by the API for on-demand use
NSString *msgID = [[V2TIMManager sharedInstance] sendC2CTextMessage:@"One-to-one text message" 
                                                                 to:@"receiver_userID"
                                                               succ:^{
    // The one-to-one text message sent successfully
} fail:^(int code, NSString *msg) {
    // Failed to send the one-to-one text message
}];

class SendCallback final : public V2TIMSendCallback {
public:
    using SuccessCallback = std::function<void(const V2TIMMessage&)>;
    using ErrorCallback = std::function<void(int, const V2TIMString&)>;
    using ProgressCallback = std::function<void(uint32_t)>;

    SendCallback() = default;
    ~SendCallback() override = default;

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

    void OnSuccess(const V2TIMMessage& message) override {
        if (success_callback_) {
            success_callback_(message);
        }
    }
    void OnError(int error_code, const V2TIMString& error_message) override {
        if (error_callback_) {
            error_callback_(error_code, error_message);
        }
    }
    void OnProgress(uint32_t progress) override {
        if (progress_callback_) {
            progress_callback_(progress);
        }
    }

private:
    SuccessCallback success_callback_;
    ErrorCallback error_callback_;
    ProgressCallback progress_callback_;
};

auto callback = new SendCallback{};
callback->SetCallback(
    [=](const V2TIMMessage& message) {
        // The one-to-one text message sent successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Failed to send the one-to-one text message
        delete callback;
    },
    [=](uint32_t progress) {
        // The progress is not called back for the text message.
    });
// `msgID` returned by the API for on-demand use
V2TIMString msgID =
    V2TIMManager::GetInstance()->SendC2CTextMessage("One-to-one text message", "receiver_userID", callback);