关闭文件上的I/O操作(缩进问题) Python-Sockets

Question

我有一个非常基本的问题。客户端完全接收到了文件并关闭了连接。服务器端在关闭文件和这行read(1024)时遇到了问题。也许我把它放在错误的位置了。我想我把while循环搞糊涂了。请指导我完成这件事。下面粘贴了简单的代码

while True:
    conn, addr = s.accept()     # Establish connection with client.
    print 'Got connection from', addr
    input = raw_input("Enter 1 for accessing file and 2 for editting")

    print(repr(input)) # printing input 
    if (input == "1"):
        filename= conn.recv(1024)
        f = open(filename,'rb')
        l = f.read(1024)

    while (1): #Keep sending it until EOF id found
        conn.send(l) #Keep sending the opened file
        print(repr(l)) 
        l = f.read(1024)
        f.close()

Answer 1

在您的while循环中，您将关闭该文件，并在下一个循环周期中尝试读取该文件，因此您会得到错误I/O operation on closed file。除了放错位置的f.close()之外，您的循环还缺少一个中断条件。更好地替换

        l = f.read(1024)

    while (1): #Keep sending it until EOF id found
        conn.send(l) #Keep sending the opened file
        print(repr(l)) 
        l = f.read(1024)
        f.close()

使用

    for l in iter(lambda: f.read(1024), ''): #Keep sending it until EOF id found
        conn.send(l)                         #Keep sending the opened file
    conn.close()
    f.close()