_winreg.EnumKey(key, i) does not workng?

Question

Hy, I trying to reconstruate a script. And in python 3 I used _winreg and the script was working, but I need it in python 2 and now I get this erorr:

File "discoverNetworks.py", line 14, in printNets
guid = _winreg.EnumKey(key, i)
WindowsError: [Error 259] No more data is available

But of course in that folder is a lot of files.

This is the code:

import _winreg
def val2addr(val):
    addr = ''
    for ch in val:
        addr += '%02x '% ord(ch)
    addr = addr.strip(' ').replace(' ', ':')[0:17]
    return addr
def printNets():
    net = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkList\\Signatures\\Unmanaged"
    key = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,net)
    print '\n[*] Networks You have Joined.'
    for i in range(100):
        try:
            guid = _winreg.EnumKey(key, i)
            netKey = _winreg.OpenKey(key, str(guid))
            (n, addr, t) = _winreg.EnumValue(netKey, 5)
            (n, name, t) = EnumValue(netKey, 4)
            macAddr = val2addr(addr)
            netName = str(name)
            print '[+] ' + netName + ' ' + macAddr
            _winreg.CloseKey(guid)
        except WindowsError:
            break
def main():
    printNets()
if __name__ == "__main__":
    main()

Thanks!

You either need to use exception handling to deal with this error or use the answer I just posted to avoid it — Dan, Aug 18 '15 at 21:56
Also, if you found my answer helpful, don't forget to upvote and mark it as accepted if it solves your problem. If not, please clarify. — Dan, Aug 18 '15 at 22:14

score 0 · Answer 1 · edited Jun 20 '20 at 09:12

EnumKey() is designed to be called repeatedly until a WindowsError is thrown. From the documentation:

winreg.EnumKey(key, index)

. . .

The function retrieves the name of one subkey each time it is called. It is typically called repeatedly until a WindowsError exception is raised, indicating, no more values are available.

However, the reason you did not receive a WindowsError when you ran it in Python 3 is because the library changed in Python 3.3 to throw an OSError instead.

In fact, EnvironmentError, IOError, WindowsError, VMSError, socket.error, select.error and mmap.error have been merged into OSError in 3.3 (source).

You can handle the error via exception handling (except WindowsError) or avoid it altogether by determining the number of values ahead of time with QueryInfoKey as demonstrated in this answer.

_winreg.EnumKey(key, i) does not workng?

1 Answers1