Question

我无法通过C中的TCP套接字传输文件。我将8192字节的小块文件从服务器发送到客户端。问题是客户端不完整地接收到最后一个，而根本没有接收到最后一个。

这是代码的两个相关部分。服务器：

fd = open(filename,O_RDONLY);
    if (fd == -1)
    {
            fprintf(stderr, "Error opening file --> %s", strerror(errno));

            exit(EXIT_FAILURE);
    }

    /* Get file stats */
    if (fstat(fd, &file_stat) < 0)
    {
            fprintf(stderr, "Error fstat --> %s", strerror(errno));

            exit(EXIT_FAILURE);
    }

    fprintf(stdout, "File Size: \n%d bytes\n", file_stat.st_size);
    sprintf(file_size, "%d", file_stat.st_size);

    /* Sending file size */
    len = send(peer_socket, file_size, sizeof(file_size), 0);
    if (len < 0)
    {
          fprintf(stderr, "Error on sending greetings --> %s", strerror(errno));

          exit(EXIT_FAILURE);
    }

    fprintf(stdout, "Server sent %d bytes for the size\n", len);

    offset = 0;
    remain_data = file_stat.st_size;
    /* Sending file data */

        while(((sent_bytes = sendfile(peer_socket, fd,&offset, BUFSIZ))>0)&&(remain_data > 0))
        {
          remain_data -= sent_bytes;
          fprintf(stdout, "2. Server sent %d bytes from file's data, offset is now : %d and remaining data = %d\n", sent_bytes, offset, remain_data);
    }

和客户端：

ecv(client_socket, buffer, BUFSIZ, 0);
    file_size = atoi(buffer);
    fprintf(stdout, "\nFile size : %d\n", file_size);

    //received_file = fclose(fopen(FILENAME, "w"));
    received_file = fopen(FILENAME, "w");
    if (received_file == NULL)
    {
            fprintf(stderr, "Failed to open file --> %s\n", strerror(errno));

            exit(EXIT_FAILURE);
    }
    remain_data = file_size;

    while ((remain_data > 0)&&((len = recv(client_socket, buffer, BUFSIZ, 0)) > 0))
    {
            fwrite(buffer, sizeof(char), len, received_file);
            remain_data -= len;
            //if (remain_data < BUFSIZ)
            //  buffsize = remain_data;
            //bzero(buffer,BUFSIZ);
            //if (len == 0 || len != BUFSIZ)
            //  break;
            fprintf(stdout, "Received %d bytes , %d bytes remaining\n", len, remain_data);
    }
    //code for accelerator here

    fclose(received_file);

服务器端的输出如下所示（似乎正确）：

但是在客户端，这是我得到的：

从那里开始，双方的应用程序永远卡住。知道什么会引起麻烦吗？感谢您的回答

C：通过TCP服务器和客户端套接字的文件传输不完整

0 个答案: