如何在套接字中傳遞和接收cmd行引數？

我正在使用 C 處理套接字，并且需要將命令列引數從客戶端傳遞到服務器。然后服務器需要切換 sting 的情況并將其發送回客戶端。我堅持將命令列引數傳遞給服務器，然后在切換案例后將其發送回。這是我到目前為止所擁有的：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#define PORT 10291
#define MAXLINE 9999
// Client side code
int main(int argc, char *argv[])
{
    int sockfd;
    char buffer[MAXLINE];
    char clientMsg;
    struct sockaddr_in servaddr;
    // Creating socket file descriptor
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
    {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }
    memset(&servaddr, 0, sizeof(servaddr));
    // Filling server information
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(PORT);
    servaddr.sin_addr.s_addr = INADDR_ANY;
    //Connect to the Server
    connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
    printf("Connected to the Server. \n");
    int n, len;
    // Getting Input From Client
    /*
    printf("Please Enter Your Message: ");
    scanf("%s", &clientMsg);
    */
    if (argc == 2)
    {
        for (int i = 0; argc; i  )
        {
            //                      send(sockfd, &argv[i], 10000, 0);
            sendto(sockfd, (const char *) &clientMsg, strlen(&clientMsg),
                MSG_CONFIRM, (const struct sockaddr *) &servaddr,
                sizeof(servaddr));
        }
        printf("Message sent to server. \n");
    }
    else
    {
        printf("Error: Please enter the correct number of arguement. \n");
        close(sockfd);
        printf("Disconneted from the Server. \n");
        exit(1);
    }
    /*
    // Sending message to server
    sendto(sockfd, (const char *) &clientMsg, strlen(&clientMsg),
                    MSG_CONFIRM, (const struct sockaddr *) &servaddr,
            sizeof(servaddr));
    printf("Message sent to server. \n");
    */
    // Receive message from server
    n = recvfrom(sockfd, (char*) buffer, MAXLINE,
        MSG_WAITALL, (struct sockaddr *) &servaddr, &len);
    buffer[n] = '\0';
    printf("Message Received From Server: %s\n", buffer);
    //Disconnet from the Server
    close(sockfd);
    printf("Disconneted from the Server. \n");
    return 0;
}

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#define PORT 10291
#define MAXLINE 9999
// Server Side code
int main(int argc, char *argv[])
{
    int sockfd;
    char buffer[MAXLINE];
    struct sockaddr_in servaddr, cliaddr;
    // Creating socket file descriptor
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
    {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }
    memset(&servaddr, 0, sizeof(servaddr));
    memset(&cliaddr, 0, sizeof(cliaddr));
    // Filling server information
    servaddr.sin_family = AF_INET;    // IPv4
    servaddr.sin_addr.s_addr = INADDR_ANY;
    servaddr.sin_port = htons(PORT);
    // Bind the socket with the server address
    if (bind(sockfd, (const struct sockaddr *) &servaddr, sizeof(servaddr)) < 0)
    {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    int len, n;
    len = sizeof(cliaddr);    //len is value/resuslt
    n = recvfrom(sockfd, (char*) buffer, MAXLINE,
        MSG_WAITALL, (struct sockaddr *) &cliaddr, &len);
    buffer[n] = '\0';
    char c;
    while (buffer[c] != '\0')
    {
        char ch = buffer[c];
        if (ch >= 'A' && ch <= 'Z')
            buffer[c] = buffer[c]   32;
        else if (ch >= 'a' && ch <= 'z')
            buffer[c] = buffer[c] - 32;
        c  ;
    }
    //Returning Encrypted String Received By Client
    sendto(sockfd, (const char *) buffer, strlen(buffer),
        MSG_CONFIRM, (const struct sockaddr *) &cliaddr, len);
    close(sockfd);
    return 0;
}

這是我的輸出：!( https://i.stack.imgur.com/uz7RY.png ) !( https://i.stack.imgur.com/nuSI0.png )

它應該是這樣的：!( https://i.stack.imgur.com/JnIFn.png )

服務器必須能夠回應多個連續的客戶端請求并執行直到明確退出 (^-C)。客戶端應處理單個請求，然后在完成后退出。

我應該如何做對？

uj5u.com熱心網友回復：

您應該從 開始argv[1]，因為argv[0]它是程式名稱，而不是引數。

for (int i = 1; i < argc; i  ) {
    sendto(sockfd, argv[i], strlen(argv[i]),
        MSG_CONFIRM, (const struct sockaddr *) &servaddr,
        sizeof(servaddr));
}

標籤：C 插座 客户端服务器

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