WNetGetConnection总是返回1200错误号

Question

在C#程序中，用WNetGetConnection来返回已经映射的网络驱动器盘符的UNC路径，但总是返回1200错误号。操作系统是Win2000+sp4，映射的目标UNC路径是完全的权限。
        [DllImport("mpr.dll")]
        public static extern int WNetGetConnection([MarshalAs(UnmanagedType.LPTStr)] string localName,
                                                   [MarshalAs(UnmanagedType.LPTStr)] System.Text.StringBuilder remoteName,
                                                   ref int length);
        /// <summary>
        /// 从映射的盘符中得到网络共享路径
        /// </summary>
        /// <param name="originalPath">映射的盘符</param>
        /// <returns>如果成功，返回网络共享路径；否则返回空</returns>
        public String GetUNCPath(string originalPath)
        {
            System.Text.StringBuilder sb = new System.Text.StringBuilder(256);
            Int32 size = sb.Capacity;
            String UNCPath = "";
            if (originalPath.Length >= 2 && originalPath[1] == ':')
            {
                char c = originalPath[0];
                if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
                {
                    int error = WNetGetConnection(originalPath.Substring(0, 2), sb, ref size);
                    //这里的返回码总是1200
                    if (error == 0)
                    {
                        System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(originalPath);
                        string path = System.IO.Path.GetFullPath(originalPath).Substring(System.IO.Path.GetPathRoot(originalPath).Length);
                        UNCPath = System.IO.Path.Combine(sb.ToString().TrimEnd(), path);
                    }
                }
            }
            return UNCPath;
        }

Answer 1

建议看看这篇文章