和此代码：
import ctypes
def get_display_name():
GetUserNameEx = ctypes.windll.secur32.GetUserNameExW
NameDisplay = 3
size = ctypes.pointer(ctypes.c_ulong(0))
GetUserNameEx(NameDisplay, None, size)
nameBuffer = ctypes.create_unicode_buffer(size.contents.value)
GetUserNameEx(NameDisplay, nameBuffer, size)
return nameBuffer.value
经过测试，可在Windows XP上运行
如OP在此处的注释中所述，pywin32将相同的API调用包装为一个更简单的函数：
win32api.GetUserName(3)
GetUserName指向ctypes.windll.secur32.GetUserNameExW，并且3与3中的常量相同ctypes
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