Question

编辑： https://stackoverflow.com/questions/1799742/shouldnt-netusermodalsget-tell-me-what-domain-a-machine-is-part-of-and-where

的又一次跟进

感谢Gonzalo的帮助，我能够use the NetUserModalsGet() from C#。但仍有一些问题：字符串成员（usrmod1_primary和usrmod2_domain_name）搞得一团糟。这是代码：

[DllImport("netapi32.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
public static extern uint NetUserModalsGet(
    string server,
    int level,
    out IntPtr BufPtr
);

[DllImport("netapi32.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
public static extern uint NetApiBufferFree(
    IntPtr bufptr
);

public struct USER_MODALS_INFO_0
{
    public uint usrmod0_min_passwd_len;
    public uint usrmod0_max_passwd_age;
    public uint usrmod0_min_passwd_age;
    public uint usrmod0_force_logoff;
    public uint usrmod0_password_hist_len;
};

public struct USER_MODALS_INFO_1
{
    public uint usrmod1_role;
    public string usrmod1_primary;
};

public struct USER_MODALS_INFO_2
{
    public string usrmod2_domain_name;
    public uint usrmod2_domain_id;
};

public struct USER_MODALS_INFO_3
{
    public uint usrmod3_lockout_duration;
    public uint usrmod3_lockout_observation_window;
    public uint usrmod3_lockout_threshold;
};

...

uint retVal;
IntPtr myBuf;
USER_MODALS_INFO_0 myInfo0 = new USER_MODALS_INFO_0();
USER_MODALS_INFO_1 myInfo1 = new USER_MODALS_INFO_1();
USER_MODALS_INFO_2 myInfo2 = new USER_MODALS_INFO_2();
USER_MODALS_INFO_3 myInfo3 = new USER_MODALS_INFO_3();

retVal = NetUserModalsGet("\\\\" + tbHost.Text, 0, out myBuf);
if (retVal == 0)
{
    myInfo0 = (USER_MODALS_INFO_0)Marshal.PtrToStructure(myBuf, typeof(USER_MODALS_INFO_0));
    myResults += String.Format("usrmod0_force_logoff={0}\nusrmod0_max_passwd_age={1}\nusrmod0_min_passwd_age={2}\nusrmod0_min_passwd_len={3}\nusrmod0_password_hist_len={4}\n",
        myInfo0.usrmod0_force_logoff.ToString("X8"),
        myInfo0.usrmod0_max_passwd_age.ToString("X8"),
        myInfo0.usrmod0_min_passwd_age.ToString("X8"),
        myInfo0.usrmod0_min_passwd_len.ToString("X8"),
        myInfo0.usrmod0_password_hist_len.ToString("X8")
        );
}
myResults += String.Format("retVal={0}\n\n", retVal);
retVal = NetApiBufferFree(myBuf);

retVal = NetUserModalsGet("\\\\" + tbHost.Text, 1, out myBuf);
if (retVal == 0)
{
    myInfo1 = (USER_MODALS_INFO_1)Marshal.PtrToStructure(myBuf, typeof(USER_MODALS_INFO_1));
    myResults += String.Format("usrmod1_primary={0}\nusrmod1_role={1}\n",
        myInfo1.usrmod1_primary,
        myInfo1.usrmod1_role.ToString("X8")
        );
}
myResults += String.Format("retVal={0}\n\n", retVal);
retVal = NetApiBufferFree(myBuf);

retVal = NetUserModalsGet("\\\\" + tbHost.Text, 2, out myBuf);
if (retVal == 0)
{
    myInfo2 = (USER_MODALS_INFO_2)Marshal.PtrToStructure(myBuf, typeof(USER_MODALS_INFO_2));
    myResults += String.Format("usrmod2_domain_id={0}\nusrmod2_domain_name={1}\n",
        myInfo2.usrmod2_domain_id.ToString("X8"),
        myInfo2.usrmod2_domain_name
        );
}
myResults += String.Format("retVal={0}\n\n", retVal);
retVal = NetApiBufferFree(myBuf);

retVal = NetUserModalsGet("\\\\" + tbHost.Text, 3, out myBuf);
if (retVal == 0)
{
    myInfo3 = (USER_MODALS_INFO_3)Marshal.PtrToStructure(myBuf, typeof(USER_MODALS_INFO_3));
    myResults += String.Format("usrmod3_lockout_duration={0}\nusrmod3_lockout_observation_window={1}\nusrmod3_lockout_threshold={2}\n",
        myInfo3.usrmod3_lockout_duration.ToString("X8"),
        myInfo3.usrmod3_lockout_observation_window.ToString("X8"),
        myInfo3.usrmod3_lockout_threshold.ToString("X8")
        );
}
myResults += String.Format("retVal={0}\n\n", retVal);
retVal = NetApiBufferFree(myBuf);

我得到的结果是：

usrmod0_force_logoff=FFFFFFFF
usrmod0_max_passwd_age=00375F00
usrmod0_min_passwd_age=00000000
usrmod0_min_passwd_len=00000000
usrmod0_password_hist_len=00000000
retVal=0

usrmod1_primary=
usrmod1_role=00000003
retVal=0

usrmod2_domain_id=08C409B0
usrmod2_domain_name=M
retVal=0

usrmod3_lockout_duration=0000012C
usrmod3_lockout_observation_window=0000012C
usrmod3_lockout_threshold=00000000
retVal=0

除usrmod1_primary和usrmod2_domain_name之外的所有内容都有道理。被测试的机器是一个域的成员，其名称以M开头。我闻到一些Unicode hijinx，但我看不出有什么问题。

Answer 1

默认情况下，结构中的字符串被封送为ANSI，但Net * API几乎只使用Unicode字符串。所以应用属性

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]

到USER_MODALS_INFO_1和_2，你应该很好。

其他一些事情：

指定时没有意义在DllImport中SetLastError = true 在这种情况下属性，因为 NetUserModalsGet不会返回错误通过SetLastError信息（你得到它返回值）。
USER_MODALS_INFO_2.usrmod2_domain_id 是一个指针因此更好建模为IntPtr（适用于x64 兼容性）。

NetUserModalsGet（）为C＃.NET错误地返回字符串

1 个答案: