Question

所以我一直试图制作一个插件告诉另一端在FTP服务器上的文本文件中下载链接，我能够在服务器上接收当前版本并修改它，但是当我尝试重新上传它，文本文件显示为空白。我尝试过使用FTP.storline和FTP.storbinary两个都给我相同的结果。我已经将print函数放在回调中，以查看它是否发生了什么事情。无论如何，任何关于为什么我无法发送附有所有数据的文件的帮助都会很棒：D！

-Clement

CODE：

def upload(link,ip,username,passwd):
    present = False
    connection = ftplib.FTP(ip)
    connection.login(user=username,passwd=passwd)
    items = connection.nlst()
    for x in items:
        if x == "list.txt":
            present = True
            break
    if present == True:
        username = os.getlogin()
        print("Got login!")
        locallist_dir = "/Users/" + username
        locallist = locallist_dir + "/list.txt"

        opened_llist_r = open(locallist, "rb")
        opened_llist = open(locallist, "wt")
        print("Opened file in", locallist)

        connection.retrlines("RETR %s" % "list.txt", opened_llist.write)
        print("Added lines from FTP")

        opened_llist.write(link + " ")
        print("Link:","'",link,"'","written!")
        print(opened_llist," | ",opened_llist_r)

        connection.storbinary("STOR %s" % "list.txt", opened_llist_r, 8192, print)
        print("Re-uploaded!")



        opened_llist.close()
        opened_llist_r.close()
    else:
        print("Your current Connection does not have the list.txt file.")

    connection.close()
    print("Connection Closed.")

ANSWERED：

抱歉这个愚蠢的问题，因为Vaughn Cato指出我不应该同时打开两个。在我调用下一个文件之前，我修复了我的代码关闭第一个文件。最终代码如下所示：

def upload(link,ip,username,passwd):
    present = False
    connection = ftplib.FTP(ip)
    connection.login(user=username,passwd=passwd)
    items = connection.nlst()
    for x in items:
        if x == "list.txt":
            present = True
            break
    if present == True:
        username = os.getlogin()
        print("Got login!")
        locallist_dir = "/Users/" + username
        locallist = locallist_dir + "/list.txt"

        opened_llist = open(locallist, "wt")
        print("Opened file in", locallist)

        connection.retrlines("RETR %s" % "list.txt", opened_llist.write)
        print("Added lines from FTP")

        opened_llist.write(link + " ")
        print("Link:","'",link,"'","written!")
        print(opened_llist)
        opened_llist.close()

        opened_llist_r = open(locallist, "rb")
        connection.storbinary("STOR %s" % "list.txt", opened_llist_r, 8192, print)
        print("Re-uploaded!")



        opened_llist_r.close()
    else:
        print("Your current Connection does not have the list.txt file.")

    connection.close()
    print("Connection Closed.")

Answer 1

将同一个文件打开两次是危险的，可能会导致意外行为。这样的事情更好：

opened_llist = open(locallist, "wt")
connection.retrlines("RETR %s" % "list.txt", opened_llist.write)
opened_llist.write(link + " ")
opened_llist.close()
opened_llist_r = open(locallist, "rb")
connection.storbinary("STOR %s" % "list.txt", opened_llist_r, 8192, print)
opened_llist_r.close()

通过二进制或ASCII上传文本文件都将其留空？

1 个答案: