Question

我必须在wpf应用程序中记住用户名和密码以及Ipaddress，我尝试使用Credential Manager以此链接给出的方式执行此操作： Encrypting credentials in a WPF application

它很好地记住了用户名和密码，但从来没有记住我想记住的Ipaddres。另一个问题是它在第二天忘记了甚至是Usrname和密码的记忆当我打开电脑。它应该永远记住它。

我的代码在这里：

用于向COM写入凭据：

  public static int WriteCredential(string applicationName, string userName, string secret,string ipAddress)
        {
            byte[] byteArray = Encoding.Unicode.GetBytes(secret);
            if (byteArray.Length > 512)
                throw new ArgumentOutOfRangeException("secret", "The secret message has exceeded 512 bytes.");

            CREDENTIAL credential = new CREDENTIAL(); //see below my credential structure
            credential.AttributeCount = 0;
            credential.Attributes = IntPtr.Zero;
            credential.Comment = IntPtr.Zero;
            credential.TargetAlias = IntPtr.Zero;
            credential.Type = CredentialType.Generic;
            credential.Persist = (UInt32)CredentialPersistence.Session;
            credential.CredentialBlobSize = (UInt32)Encoding.Unicode.GetBytes(secret).Length;
            credential.TargetName = Marshal.StringToCoTaskMemUni(applicationName);
            credential.CredentialBlob = Marshal.StringToCoTaskMemUni(secret);
            credential.UserName = Marshal.StringToCoTaskMemUni(userName ?? Environment.UserName);
            credential.IpAddress= Marshal.StringToCoTaskMemUni(ipAddress);

            bool written = CredWrite(ref credential, 0);
            int lastError = Marshal.GetLastWin32Error();

            Marshal.FreeCoTaskMem(credential.TargetName);
            Marshal.FreeCoTaskMem(credential.CredentialBlob);
            Marshal.FreeCoTaskMem(credential.UserName);
            Marshal.FreeCoTaskMem(credential.IpAddress);

            if (written)
                return 0;

            throw new Exception(string.Format("CredWrite failed with the error code {0}.", lastError));
        }

凭据结构：

  [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    private struct CREDENTIAL
    {
        public UInt32 Flags;
        public CredentialType Type;
        public IntPtr TargetName;
        public IntPtr Comment;
        public System.Runtime.InteropServices.ComTypes.FILETIME LastWritten;
        public UInt32 CredentialBlobSize;
        public IntPtr CredentialBlob;
        public UInt32 Persist;
        public UInt32 AttributeCount;
        public IntPtr Attributes;
        public IntPtr TargetAlias;
        public IntPtr UserName;
        public IntPtr IpAddress;
    }

从COM阅读：

  public static Credential ReadCredential(string applicationName)
        {
            IntPtr nCredPtr;
            bool read = CredRead(applicationName, CredentialType.Generic, 0, out nCredPtr);
            if (read)
            {
                using (CriticalCredentialHandle critCred = new CriticalCredentialHandle(nCredPtr))
                {
                    CREDENTIAL cred = critCred.GetCredential(); //cred.IpAddress gives me null here whereas it is not null in case of UserName and CredentialBlob
                    return ReadCredential(cred);
                }
            }
            return null;
        }

如何解决这两个问题：

（1）如何记忆IP地址

（2）如何在下一次打开电脑后的第二天记住数据

我找到了第二个问题的答案：CRED_PERSIST_LOCAL_MACHINE但不是第一个问题，我能找到的第二个问题的另一个解决方案是“CredentialManager.WriteCredential（”Application“，userName +”+“+ ipAddress，passWord ）;”然后在“+”上阅读时分开。如果有人知道解决方案吗？

如何使用CredentialManager记忆ipaddress？

0 个答案: