socket以C语音实现linux服务端和windows客户端文件传输

要实现文件传输，需要在服务端和客户端之间建立一个TCP连接，可以使用socket来实现。下面是一个基本的示例代码：

服务端代码（Linux）：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#define PORT 8888
#define MAXLINE 1024

int main() {
    int sockfd, connfd;
    struct sockaddr_in servaddr, cliaddr;
    char buff[MAXLINE];
    int n;

    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1) {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }

    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = INADDR_ANY;
    servaddr.sin_port = htons(PORT);

    if (bind(sockfd, (const struct sockaddr*)&servaddr, sizeof(servaddr)) != 0) {
        perror("socket bind failed");
        exit(EXIT_FAILURE);
    }

    if (listen(sockfd, 5) != 0) {
        perror("listen failed");
        exit(EXIT_FAILURE);
    }

    while (1) {
        printf("waiting for client connection...\n");
        socklen_t clilen = sizeof(cliaddr);
        connfd = accept(sockfd, (struct sockaddr*)&cliaddr, &clilen);
        if (connfd < 0) {
            perror("accept failed");
            exit(EXIT_FAILURE);
        }
        printf("client connected: %s:%d\n", inet_ntoa(cliaddr.sin_addr), cliaddr.sin_port);

        FILE *fp = fopen("test.txt", "wb");
        if (fp == NULL) {
            perror("file creation failed");
            exit(EXIT_FAILURE);
        }

        while ((n = read(connfd, buff, MAXLINE)) > 0) {
            fwrite(buff, sizeof(char), n, fp);
        }

        if (n < 0) {
            perror("error reading from socket");
            exit(EXIT_FAILURE);
        }

        fclose(fp);
        printf("file received successfully\n");
        close(connfd);
    }
    close(sockfd);
    return 0;
}

客户端代码（Windows）：

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

#define PORT 8888
#define MAXLINE 1024

int main() {
    WSADATA wsaData;
    int sockfd;
    struct sockaddr_in servaddr;
    char buff[MAXLINE];
    int n;

    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        perror("WSAStartup failed");
        exit(EXIT_FAILURE);
    }

    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1) {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }

    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    servaddr.sin_port = htons(PORT);

    if (connect(sockfd, (SOCKADDR*)&servaddr, sizeof(servaddr)) < 0) {
        perror("connection failed");
        exit(EXIT_FAILURE);
    }

    FILE *fp = fopen("test.txt", "rb");
    if (fp == NULL) {
        perror("file open failed");
        exit(EXIT_FAILURE);
    }

    while ((n = fread(buff, sizeof(char), MAXLINE, fp)) > 0) {
        if (send(sockfd, buff, n, 0) < 0) {
            perror("error sending file");
            exit(EXIT_FAILURE);
        }
    }

    fclose(fp);
    printf("file sent successfully\n");
    closesocket(sockfd);
    WSACleanup();
    return 0;
}

这两份代码分别在Linux和Windows系统上编译运行即可实现文件传输。