udp帧组包和监测丢包

udp帧组包和监测丢包

#include 
#include 

const  int MaxSequenceNumber = 100; // 假设最大的序号不超过100

// 定义数据帧结构
struct DataFrame {
    int sequenceNumber;
    std::string data;
    DataFrame():sequenceNumber(-1),data(""){

    }
    DataFrame(int seq, const std::string& d) : sequenceNumber(seq), data(d) {

    }
};

int main() {
    // 使用数组来存储接收到的数据帧
    DataFrame receivedFrames[MaxSequenceNumber] ;

    // 初始化数组
    for (int i = 0; i < MaxSequenceNumber; ++i) {
        receivedFrames[i] = DataFrame(-1, ""); // -1表示该位置没有数据帧
    }

    // 模拟接收乱序数据包的过程
    // 这里假设数据包按照序号 9 4 1 5 的顺序到达
    receivedFrames[9] = DataFrame(9, "Data for sequence ");
    receivedFrames[4] = DataFrame(4, "Data for sequence ");
    receivedFrames[1] = DataFrame(1, "Data for sequence ");
    receivedFrames[5] = DataFrame(5, "Data for sequence ");

    // 检查丢包并输出丢失的序号
    int expectedSequenceNumber = 0;
    for (int i = 0; i < MaxSequenceNumber; ++i) {
        if (receivedFrames[i].sequenceNumber == -1) {
            std::cout << "Lost Frame with Sequence Number: " << expectedSequenceNumber << std::endl;
        } else {
            std::cout << "Sequence Number: " << receivedFrames[i].sequenceNumber << ", Data: " << receivedFrames[i].data << std::endl;
        }
        expectedSequenceNumber++;
    }

    return 0;
}