c - C中的套接字程序无法编译

Question

大家好，我在读一本关于套接字编程的书，里面有两个代码客户端和服务器。

这是服务器代码

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
void error(char *msg)
{
    perror(msg);
    exit(1);
}
int main(int argc, char *argv[])
{
    int sockfd, newsockfd, portno, clilen;
    char buffer[256];
    struct sockaddr_in serv_addr, cli_addr;
    int n;
    if (argc < 2) {
        fprintf(stderr,"ERROR, no port provided/n");
        exit(1);
    }
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if(sockfd < 0)
        error("ERROR OPENING SOCKET");
    bzero((char *) &serv_addr, sizeof(serv_addr));
    portno = atoi(argv[1]);
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = INADDR_ANY;
    serv_addr.sin_port = htons(portno);
    if(bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) <0)
        error("ERROR on binding");
    listen(sockfd,5);
    clilen = sizeof(cli_addr);
    newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &client);
    if(newsockfd < 0)
        error("ERROR ON ACCEPT");
    bzero(buffer,256);
    n = read(newsockfd,buffer,255);
    if(n < 0)
        error("ERROR READING FROM SOCKET");
        printf("HERE IS THE MESSAGE: %s\n",buffer);
        n = write(newsockfd,"I GOT YOUR MESSAGE",18);
        if(n < 0)
            error("ERROR WRITING TO SOCKET");
        return 0;
}

这是客户端代码

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

void error(char *msg)
{
    perror(msg);
    exit(1);
}
int main(int argc, char *argv[])
{
    int sockfd, portno, n;
    struct sockaddr_in serv_addr;
    struct hostent *server;

    char buffer[256];
    if(argc < 3) {
        fprintf(stderr,"USAGE %s hostname port\n", argv[0]);
    }
    portno = atoi(argv[2]);
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if(sockfd < 0)
        error("ERROR OPENING SOCKET");
    server = gethostbyname(argv[1]);
    if(server == NULL) {
        fprintf(stderr,"ERROR no such host\n");
        exit(0);
    }
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr, (char *)&serv_addr.sin_addr.s_addr, server->h_length);
    serv_addr.sin_port = htons(portno);
    if(connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0)
        error("ERROR CONECTING");
    printf("Please Enter the message: ");
    bzero(buffer,256);
    fgets(buffer,255,stdin);
    n = write(sockfd,buffer,strlen(buffer));
    if(n < 0)
    error("ERROR READING THE SOCKET");
    printf("%s\n",buffer);
    return 0;
}

但是当我用 visual studio 或 turbo c++ 或 borland c++ 编译它时，他们给我错误，我已经下载了所有必需的头文件，但问题仍然存在。

Answer 1

问题是您正在阅读标准“BSD”套接字库的示例。 Windows 使用略有不同的套接字库。

对于更通用的方法，您可以将标准 BSD 套接字程序(您在书中阅读的内容)移植到 Winsock . Advice here .

或者，如果您想要 Windows 中的套接字兼容系统，您可以从 http://cygwin.com/ 下载 Cygwin。并从那里运行你的程序。 (一定要在setup.exe程序中下载GCC编译器等)