关于#c语言#的问题：如何将com1接收到的数据发送给com2还请指导一下

Question

VS C语言中如何将com1接收到的数据发送给com2还请指导一下

Answer 1

com1和com2是什么，能不能说详细一点
网络编程可以实现

服务器端

#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <winsock2.h> 

#define PORT 8888
#define  BUFFER_SIZE 4196

const char* kExitFlag = "exit";

int main() {
    WORD winsock_version = MAKEWORD(2,2);
    WSADATA wsa_data;
    if (WSAStartup(winsock_version, &wsa_data) != 0) {
        printf("Failed to init socket dll!\n");
        return 1;
    }
    
    SOCKET server_socket= socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (server_socket == INVALID_SOCKET) {
        printf("Failed to create server socket!\n");
        return 2;
    }
    
    struct sockaddr_in server_addr;
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.S_un.S_addr = INADDR_ANY;
    
    if (bind(server_socket, (LPSOCKADDR)&server_addr, sizeof(server_addr)) == SOCKET_ERROR) {
        printf("Failed to bind port!\n");
        return 3;
    }
    
    if (listen(server_socket, 10)) {
        printf("Failed to listen!\n");
        return 4;
    }
    
    struct sockaddr_in client_addr;
    int client_addr_len = sizeof(client_addr);
    printf("Wait for connecting...\n");
    
    SOCKET client_socket = accept(server_socket, (SOCKADDR*)&client_addr, &client_addr_len);
    if (client_socket == INVALID_SOCKET) {
        printf("Failed to accept!\n");
        return 5;
    }
    
    printf("Succeed to receive a connection: %s\n" , inet_ntoa(client_addr.sin_addr));
    
    char recv_buf[BUFFER_SIZE+1];
    while (true) {
        int ret = recv(client_socket, recv_buf, BUFFER_SIZE, 0);
        if (ret < 0) {
            printf("Failed to receive data!\n");
            break;
        }
        recv_buf[ret]=0; // correctly ends received string
        
        printf("Receive from Client: \"%s\" \n", recv_buf);
        if (strcmp(kExitFlag,recv_buf)==0) {        
            printf("Exit!\n");
        }
        
        const char* send_data = "Hello, Tcp Client!";
        send(client_socket, send_data, strlen(send_data), 0);
    }
    
    closesocket(client_socket);
    closesocket(server_socket);
    
    WSACleanup();
    
    return 0;
}

客户端

#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <winsock2.h>  
#define PORT 8888
char SERVER_IP[];
#define  BUFFER_SIZE 4196

const char* kExitFlag = "exit";

int main() {
    // 初始化socket dll。
    WORD winsock_version = MAKEWORD(2,2);
    WSADATA wsa_data;
    if (WSAStartup(winsock_version, &wsa_data) != 0) {
        printf("Failed to init socket!\n");
        return 1;
    }
    
    SOCKET client_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (client_socket == INVALID_SOCKET) {
        printf("Failed to create server socket!\n");
        return 2;
    }
    
    printf("please scanf the server IP PORT");
    scanf("%s",&SERVER_IP);
    printf("%s",SERVER_IP);
    
    struct sockaddr_in server_addr;
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.S_un.S_addr = inet_addr(SERVER_IP);
    if (connect(client_socket, (LPSOCKADDR)&server_addr, sizeof(server_addr)) == SOCKET_ERROR) {
        printf("Failed to connect server: %ld !\n", GetLastError());
        return 3;
    }
    
    char recv_data[BUFFER_SIZE+1];
    
    while (true) {
        char data[BUFFER_SIZE+1];
        printf("Input data: ");
        scanf("%s",data);
        if (send(client_socket, data, strlen(data), 0) < 0) {
            printf("Failed to send data!\n");
            break;
        }
        
        int ret = recv(client_socket, recv_data, BUFFER_SIZE, 0);
        if (ret < 0) {
            printf("Failed to receive data!\n");
            break;
        }
        recv_data[ret]=0; // correctly ends received string
        
        printf("Receive data from server: \"%s\"\n",recv_data);
        
        if (strcmp(data,kExitFlag)==0) {
            printf("Exit!\n");
            break;
        }
    }
    
    closesocket(client_socket);
    WSACleanup();
    
    return 0;
}

效果如图：