ApsaraMQ for RocketMQ:Send and receive normal messages by using the C++ HTTP SDK

#include <vector>
#include <fstream>
#include "mq_http_sdk/mq_client.h"

#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#endif

using namespace std;
using namespace mq::http::sdk;

int main() {

    MQClient mqClient(
            // The HTTP endpoint, found in the HTTP Endpoint section
            // of the Instance Details page in the ApsaraMQ for RocketMQ console.
            "${HTTP_ENDPOINT}",
            // The AccessKey ID and AccessKey secret for authentication.
            // Read from environment variables to avoid hardcoding credentials.
            System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID"),
            System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET")
            );

    // The topic to consume messages from. Create the topic in the ApsaraMQ for RocketMQ console.
    string topic = "${TOPIC}";
    // The consumer group ID. Create the consumer group in the ApsaraMQ for RocketMQ console.
    string groupId = "${GROUP_ID}";
    // The instance ID. If the instance has no namespace, set this to an empty string.
    // Check the namespace on the Instance Details page in the console.
    string instanceId = "${INSTANCE_ID}";

    MQConsumerPtr consumer;
    if (instanceId == "") {
        consumer = mqClient.getConsumerRef(topic, groupId);
    } else {
        consumer = mqClient.getConsumerRef(instanceId, topic, groupId, "");
    }

    do {
        try {
            std::vector<Message> messages;
            // Consume messages in long polling mode.
            // If no messages are available, the broker holds the request for the specified
            // polling duration and responds immediately when a message arrives.
            consumer->consumeMessage(
                    3, // Batch size: max messages per request. Maximum allowed: 16.
                    3, // Polling duration in seconds. Maximum allowed: 30.
                    messages
            );
            cout << "Consume: " << messages.size() << " Messages!" << endl;

            // Process each message and collect receipt handles for acknowledgment.
            std::vector<std::string> receiptHandles;
            for (std::vector<Message>::iterator iter = messages.begin();
                    iter != messages.end(); ++iter)
            {
                cout << "MessageId: " << iter->getMessageId()
                    << " PublishTime: " << iter->getPublishTime()
                    << " Tag: " << iter->getMessageTag()
                    << " Body: " << iter->getMessageBody()
                    << " FirstConsumeTime: " << iter->getFirstConsumeTime()
                    << " NextConsumeTime: " << iter->getNextConsumeTime()
                    << " ConsumedTimes: " << iter->getConsumedTimes()
                    << " Properties: " << iter->getPropertiesAsString()
                    << " Key: " << iter->getMessageKey() << endl;
                receiptHandles.push_back(iter->getReceiptHandle());
            }

            // Send an ACK to the broker. If the broker does not receive an ACK before
            // NextConsumeTime, it redelivers the message. Each receipt handle carries
            // a unique timestamp that expires after the NextConsumeTime window.
            AckMessageResponse bdmResp;
            consumer->ackMessage(receiptHandles, bdmResp);
            if (!bdmResp.isSuccess()) {
                // Log failed ACK items. A handle that has expired causes ACK failure,
                // and the broker redelivers the corresponding message.
                const std::vector<AckMessageFailedItem>& failedItems =
                    bdmResp.getAckMessageFailedItem();
                for (std::vector<AckMessageFailedItem>::const_iterator iter = failedItems.begin();
                        iter != failedItems.end(); ++iter)
                {
                    cout << "AckFailedItem: " << iter->errorCode
                        << "  " << iter->receiptHandle << endl;
                }
            } else {
                cout << "Ack: " << messages.size() << " messages suc!" << endl;
            }
        } catch (MQServerException& me) {
            if (me.GetErrorCode() == "MessageNotExist") {
                cout << "No message to consume! RequestId: " + me.GetRequestId() << endl;
                continue;
            }
            cout << "Request Failed: " + me.GetErrorCode() + ".RequestId: " + me.GetRequestId() << endl;
#ifdef _WIN32
            Sleep(2000);
#else
            usleep(2000 * 1000);
#endif
        } catch (MQExceptionBase& mb) {
            cout << "Request Failed: " + mb.ToString() << endl;
#ifdef _WIN32
            Sleep(2000);
#else
            usleep(2000 * 1000);
#endif
        }

    } while(true);
}