我成功地调用了advapi32';s LsaEnumerateAccountRights()来自C#。现在我如何解组它返回的LSA_UNICODE_字符串数组?
它是指向结构数组的指针。我发现了一些与此相反的代码,即从C字符串创建我成功地调用了advapi32';s LsaEnumerateAccountRights()来自C#。现在我如何解组它返回的LSA_UNICODE_字符串数组?,c#,unicode,marshalling,advapi32,C#,Unicode,Marshalling,Advapi32,它是指向结构数组的指针。我发现了一些与此相反的代码,即从C字符串创建LSA\u UNICODE\u字符串。您可以在下面的帮助程序代码部分中看到这一点 我所做的,包括调用LsaEnumerateAccountRights()似乎很好。返回数组指针和计数的合理值 我不知道怎样才能抓住那些该死的弦。请帮忙?漂亮吗 更新:nobugz在下面的答案中的helper函数几乎正确,您只需将长度除以unicodeincode.CharSize。多亏了他,我现在可以看到数组中的第一个字符串。请参阅下面两个代码部分
LSA\u UNICODE\u字符串。您可以在下面的帮助程序代码部分中看到这一点
我所做的,包括调用LsaEnumerateAccountRights()
似乎很好。返回数组指针和计数的合理值
我不知道怎样才能抓住那些该死的弦。请帮忙?漂亮吗
更新:nobugz在下面的答案中的helper函数几乎正确,您只需将长度除以unicodeincode.CharSize
。多亏了他,我现在可以看到数组中的第一个字符串。请参阅下面两个代码部分末尾的更新
现在,我该怎么做指针算术呢
更新2.5:有关功能代码,请参阅答案。我丢失了旧的“错误”代码。这应该适用于您:
private static string LSAUS2String(LSA_UNICODE_STRING lsa) {
char[] cvt = new char[lsa.Length];
Marshal.Copy(lsa.Buffer, cvt, 0, lsa.Length);
return new string(cvt);
}
找到了!在里面现在,下面修订的代码完全起作用。它甚至是64位安全的
主要代码:
IntPtr sid = IntPtr.Zero;
int sidSize = 0;
StringBuilder domainName = new StringBuilder();
int nameSize = 0;
int accountType = 0;
LookupAccountName("\\\\" + tbHost.Text, tbUsername.Text, sid, ref sidSize,
domainName, ref nameSize, ref accountType);
domainName = new StringBuilder(nameSize);
sid = Marshal.AllocHGlobal(sidSize);
bool result = LookupAccountName("\\\\" + tbHost.Text, tbUsername.Text, sid, ref sidSize,
domainName, ref nameSize, ref accountType);
myResults.Text += String.Format("LookupAccountName(): Result {0}, SID {1}\n", result, sid);
LSA_UNICODE_STRING systemName = string2LSAUS("\\\\" + tbHost.Text);
IntPtr policyHandle = IntPtr.Zero;
LSA_OBJECT_ATTRIBUTES objAttrs = new LSA_OBJECT_ATTRIBUTES();
uint retVal = LsaOpenPolicy(ref systemName, ref objAttrs,
POLICY_LOOKUP_NAMES | POLICY_VIEW_LOCAL_INFORMATION, out policyHandle);
myResults.Text += String.Format("LsaOpenPolicy(): Result {0}, Policy Handle {1}\n", retVal, policyHandle);
IntPtr rightsArray = IntPtr.Zero;
ulong rightsCount = 0;
long lretVal = LsaEnumerateAccountRights(policyHandle, sid, out rightsArray, out rightsCount);
retVal = LsaNtStatusToWinError(lretVal);
if (retVal != 0)
throw new System.ComponentModel.Win32Exception((int)retVal);
myResults.Text += String.Format("LsaEnumerateAccountRights(): Result {0}, RightsArray {1}, Count {2}\n",
retVal, rightsArray, rightsCount);
LSA_UNICODE_STRING myLsaus = new LSA_UNICODE_STRING();
for (ulong i = 0; i < rightsCount; i++)
{
IntPtr itemAddr = new IntPtr(rightsArray.ToInt64() + (long)(i * (ulong) Marshal.SizeOf(myLsaus)));
myLsaus = (WinNetUtils.LSA_UNICODE_STRING)Marshal.PtrToStructure(itemAddr, myLsaus.GetType());
string thisRight = WinNetUtils.LSAUS2string(myLsaus);
NonBlockingPrint(wmiResults, "Right #{0}: {1}\n", i+1, thisRight);
}
LsaClose(policyHandle);
似乎我必须对数组的每个成员使用Marshal.PtrToStructure(),但是如何遍历数组呢?指针算法???PTRTO结构?不,它是一个字符数组。Marshal.Copy将其从IntPtr复制到char[]。很简单,对不起,我刚才说的是更高级的数组,LSA_UNICODE_字符串的数组。我现在让它工作(见上图)。谢谢你的帮助!您应该从问题中提取答案并将其放在此处。此外,还需要确保您正在调用LsaClose()以关闭句柄。完成,完成。不幸的是,我丢失了原始的不起作用的代码,因此问题看起来有点不完整。NTSTATUS
的长度是32位,而不是64位。请注意,此代码存在内存泄漏。Marshal.StringToHGlobalUni需要对Marshal.FreeHGlobal.Related的相应调用:和:
public const int POLICY_VIEW_LOCAL_INFORMATION = 0x1;
public const int POLICY_LOOKUP_NAMES = 0x00000800;
[DllImport("advapi32.dll", CharSet = CharSet.Unicode, PreserveSig = true)]
public static extern UInt32 LsaNtStatusToWinError(
long Status);
[DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true, PreserveSig = true)]
public static extern bool ConvertStringSidToSid(
string StringSid, out IntPtr pSid);
[DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true, PreserveSig = true)]
public static extern bool LookupAccountName(
string lpSystemName, string lpAccountName,
IntPtr psid, ref int cbsid,
StringBuilder domainName, ref int cbdomainLength,
ref int use );
[DllImport("advapi32.dll", CharSet = CharSet.Unicode, PreserveSig = true)]
public static extern UInt32 LsaOpenPolicy(
ref LSA_UNICODE_STRING SystemName,
ref LSA_OBJECT_ATTRIBUTES ObjectAttributes,
Int32 DesiredAccess,
out IntPtr PolicyHandle );
[DllImport("advapi32.dll", SetLastError = true, PreserveSig = true)]
public static extern long LsaEnumerateAccountRights(
IntPtr PolicyHandle, IntPtr AccountSid,
out /* LSA_UNICODE_STRING[] */ IntPtr UserRights,
out ulong CountOfRights);
[DllImport("advapi32.dll", SetLastError = true, PreserveSig = true)]
public static extern long LsaClose(
IntPtr PolicyHandle);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct LSA_UNICODE_STRING
{
public UInt16 Length;
public UInt16 MaximumLength;
public IntPtr Buffer;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct LSA_OBJECT_ATTRIBUTES
{
public IntPtr RootDirectory;
public IntPtr SecurityDescriptor;
public IntPtr SecurityQualityOfService;
public LSA_UNICODE_STRING ObjectName;
public UInt32 Attributes;
public UInt32 Length;
}
public static LSA_UNICODE_STRING string2LSAUS(string myString)
{
LSA_UNICODE_STRING retStr = new LSA_UNICODE_STRING();
retStr.Buffer = Marshal.StringToHGlobalUni(myString);
retStr.Length = (UInt16)(myString.Length * UnicodeEncoding.CharSize);
retStr.MaximumLength = (UInt16)((myString.Length + 1) * UnicodeEncoding.CharSize);
return retStr;
}
public static string LSAUS2string(LSA_UNICODE_STRING lsaus)
{
char[] cvt = new char[lsaus.Length / UnicodeEncoding.CharSize];
Marshal.Copy(lsaus.Buffer, cvt, 0, lsaus.Length / UnicodeEncoding.CharSize);
return new string(cvt);
}