用udp和tcp知识写一个文件传输用c语言

下面是一个使用UDP和TCP协议传输文件的示例程序：

使用UDP协议传输文件：

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

#define BUF_SIZE 1024

void error_handling(char *message);

int main(int argc, char *argv[]) {
    int sock;
    struct sockaddr_in serv_addr;
    FILE *fp;
    char buf[BUF_SIZE];
    int read_cnt;
    
    if (argc != 3) {
        printf("Usage: %s <IP> <port>\n", argv[0]);
        exit(1);
    }
    
    fp = fopen("file.txt", "rb");
    sock = socket(PF_INET, SOCK_DGRAM, 0);
    if (sock == -1)
        error_handling("socket() error");
    
    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = inet_addr(argv[1]);
    serv_addr.sin_port = htons(atoi(argv[2]));
    
    while (1) {
        read_cnt = fread((void *)buf, 1, BUF_SIZE, fp);
        if (read_cnt < BUF_SIZE) {
            sendto(sock, buf, read_cnt, 0, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
            break;
        }
        sendto(sock, buf, BUF_SIZE, 0, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
    }
    
    fclose(fp);
    close(sock);
    
    return 0;
}

void error_handling(char *message) {
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}

使用TCP协议传输文件：

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

#define BUF_SIZE 1024

void error_handling(char *message);

int main(int argc, char *argv[]) {
    int serv_sock, clnt_sock;
    FILE *fp;
    char buf[BUF_SIZE];
    int read_cnt;
    struct sockaddr_in serv_addr, clnt_addr;
    socklen_t clnt_addr_size;
    
    if (argc != 2) {
        printf("Usage: %s <port>\n", argv[0]);
        exit(1);
    }
    
    fp = fopen("file.txt", "rb");
    serv_sock = socket(PF_INET, SOCK_STREAM, 0);
    if (serv_sock == -1)
        error_handling("socket() error");
    
    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(atoi(argv[1]));
    
    if (bind(serv_sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1)
        error_handling("bind() error");
    
    if (listen(serv_sock, 5) == -1)
        error_handling("listen() error");
    
    clnt_addr_size = sizeof(clnt_addr);
    clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_addr, &clnt_addr_size);
    
    while (1) {
        read_cnt = fread((void *)buf, 1, BUF_SIZE, fp);
        if (read_cnt < BUF_SIZE) {
            write(clnt_sock, buf, read_cnt);
            break;
        }
        write(clnt_sock, buf, BUF_SIZE);
    }
    
    fclose(fp);
    close(clnt_sock);
    close(serv_sock);
    
    return 0;
}

void error_handling(char *message) {
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}

这两个程序分别实现了使用UDP和TCP协议传输文件。其中，UDP版本使用sendto函数发送文件内容，TCP版本使用write函数发送文件内容，接收方可以使用相应的接收函数来接收文件内容。在这个示例中，文件名为file.txt，需要和发送方一致