1-client.cpp

#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <netdb.h>
#include <string.h>

using namespace std;

#define ASSERT(err)                                                   \
    do                                                                \
    {                                                                 \
        if (err < 0)                                                  \
        {                                                             \
            printf("[%s][%d] error : %d\n", __FILE__, __LINE__, err); \
            fflush(stdout);                                           \
            exit(err);                                                \
        }                                                             \
    } while (0)

#define DEBUG printf("[%d]\n", __LINE__)

int main(int argc, char * argv[])
{
    struct hostent * server = gethostbyname("localhost");

    struct sockaddr_in clientAddr;
    clientAddr.sin_family = AF_INET;
    clientAddr.sin_port = htons(51717);
    memcpy(&clientAddr.sin_addr.s_addr, server->h_addr, server->h_length);

    int ret = 0;
    int fd = socket(AF_INET, SOCK_STREAM, 0);
    ASSERT(fd);
    ret = connect(fd, (struct sockaddr *) & clientAddr, sizeof(clientAddr));
    ASSERT(ret);
    socklen_t clientLenght = sizeof(clientAddr);
    bool exit = false;
    while(!exit)
    {
        DEBUG;
        char readBuffer[256] = {0};
        DEBUG;
        char writeBuffer[256] = {0};
        DEBUG;
        fgets(&writeBuffer[0], 256, stdin);
        printf("size of wb %d\n", strlen(&writeBuffer[0]));
        DEBUG;
        int writeLength = write(fd, &writeBuffer[0], strlen(&writeBuffer[0]));
        printf("%d : %s\n",writeLength, &writeBuffer[0]);
        DEBUG;
        int readLength = read(fd, &readBuffer[0], 256);
        DEBUG;
        printf("%d : %s\n",readLength, &readBuffer[0]);
        DEBUG;
        fflush(stdin);
    }
    close(fd);
    return 0;
}