UDP的使用示例

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1.Server.cpp

#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
//    if(argc <= 2)
//    {
//        cout<<"please enter more args"<<endl;
//        return 0;
//    }
//    int port = atoi(argv[1]);
//    char* ip = argv[2];
    int port = 5566;
    int sock = socket(AF_INET, SOCK_DGRAM, 0);
    assert(sock >= 0);

    struct sockaddr_in addr;
    bzero(&addr, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    addr.sin_addr.s_addr = htonl( INADDR_ANY );
    //inet_pton(AF_INET, ip, &addr.sin_addr); //if do you can use telnet

    int ret = bind(sock, (struct sockaddr*)&addr, sizeof(addr));
    assert(ret == 0);

    struct sockaddr_in acceptaddr;
    unsigned int len = sizeof(acceptaddr);
    char recvbuf[128] = {'\0'};
    while(true)
    {
        ret = recvfrom(sock, recvbuf, 128, 0, (struct sockaddr*)&acceptaddr, &len);
        cout<<"buf is: "<<recvbuf<<endl;
        assert(ret > 0);
        ret = sendto(sock, recvbuf, 128, 0, (struct sockaddr*)&acceptaddr, len);
        assert(ret > 0);
    }
    close(sock);
    return 1;
}

2.client.cpp

#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
    if(argc <= 2)
    {
        cout<<"please enter more args"<<endl;
        return 0;
    }

    char* ip = argv[1];
    int port = atoi(argv[2]);

    int sock = socket(AF_INET, SOCK_DGRAM, 0);
    assert(sock >= 0);

    struct sockaddr_in addr;
    bzero(&addr, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    inet_pton(AF_INET, ip, &addr.sin_addr);

    const char *buf = "This is a test from jack";

    int ret = sendto(sock, buf, strlen(buf), 0, (struct sockaddr*)&addr, sizeof(addr));
    assert(ret > 0);

    struct sockaddr_in acceptaddr;
    unsigned int len = sizeof(acceptaddr);

    char recvbuf[128] = { '\0' };
    ret = recvfrom(sock, recvbuf, 128, 0, (struct sockaddr*)&acceptaddr, &len);
    assert(ret > 0);

    cout<<"recv "<<ret<<" bytes, buf is: "<<recvbuf<<endl;

    close(sock);
    return 1;
}

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