c - 循环客户端到服务器

Question

我想用 ubuntu c 制作一个简单的服务器客户端。我想要实现的是服务器将成为“eshop”。如您所见，它有 4 种产品。客户端将自动生成随机数(0 到 3)，将它们发送到服务器和服务器，检查可用性并响应客户端。到目前为止一切顺利，但我想给客户打电话 5 次。每次客户订购 10 件产品。我该如何接近它？
服务器

#include <stdio.h>
#include <stdlib.h>

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


struct items{
        char *description;
        int price;
        int item_count;
    };



int main(){




    //items
    struct items catalog[20];
        catalog[0].item_count = 2;
        catalog[0].description = "psigio";
        catalog[0].price = 100;
        catalog[1].item_count = 2;
        catalog[1].description = "thleorash";
        catalog[1].price = 150;
        catalog[2].item_count = 2;
        catalog[2].description = "kinito";
        catalog[2].price = 120;
        catalog[3].item_count = 2;
        catalog[3].description = "pc";
        catalog[3].price = 300;
        
    char server_message[256] = "you have reached the server!";
    char item_name[256];
    
    // create the server socket
    int server_socket;
    server_socket = socket(AF_INET, SOCK_STREAM, 0);
    
    printf("pending connection...");
    
    //define the server address
    struct sockaddr_in server_address;
    server_address.sin_family = AF_INET;
    server_address.sin_port = htons(9002);
    server_address.sin_addr.s_addr = INADDR_ANY;
    
    //bind the socket to our specified IP and port
    bind(server_socket, (struct sockaddr*) &server_address, sizeof(server_address));
    
    listen(server_socket, 0);
    
    
    int client_socket;
    client_socket = accept(server_socket, NULL, NULL);
    printf("Connection accepted\n");
    printf("Listening...\n");
    
    //send message to client
    send(client_socket, server_message, sizeof(server_message), 0);
    
    //recieve item and check
    int ran, stock;
    recv(client_socket, &ran, sizeof(ran), 0);
    printf("Server random: %d\n", ran);
    if (catalog[ran].item_count>0){
        catalog[ran].item_count--;
        stock = 1;
    }else{
        stock =0;
    }
    send(client_socket, &stock, sizeof(stock), 0);
    send(client_socket, catalog[ran].description, sizeof(catalog[ran].description), 0);
    
    //close the socket
    close(server_socket);
    return 0;
}

客户

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <netinet/in.h>

int main(){

    //create a socket
    int network_socket;
    network_socket = socket(AF_INET, SOCK_STREAM, 0);
    
    //specify an address for the socket
    struct sockaddr_in server_address;
    server_address.sin_family = AF_INET;
    server_address.sin_port = htons(9002);
    server_address.sin_addr.s_addr = INADDR_ANY;
    
    int connection_status = connect(network_socket, (struct sockaddr *) &server_address, sizeof(server_address));
    //check for errors in connection
    if (connection_status == -1) {
        perror("Connection error: \n");
    }sleep(1);
    
    
    //recieve data from the server
    char server_response[256];
    recv(network_socket, &server_response, sizeof(server_response), 0);
    
    //print the server's response
    printf("the server send the data: %s\n", server_response);
    
    //generate random numbers
    int random,stock;
    char test[256];

    srand(time(NULL));
    random = rand() %4;
    printf("client random: %d\n", random);
    send(network_socket, &random, sizeof(random), 0);
    
    //recieve stock of item
    recv(network_socket, &stock, sizeof(stock), 0);
    recv(network_socket, &test, sizeof(test), 0);
    if (stock==1){
        printf("%s in stock\n", test);
    }else{
        printf("%s item out of stock\n", test);
    }
    
    //close the socket
    close(network_socket);
    
    return 0;



}

Answer 1

您可以将“生成随机数并发送到服务器并接收响应”放在 for 中。环形 !