我正在尝试在 Powershell 中添加类型。我正在使用 netapi32.dll 使用 NetSessionEnum 函数。
这几乎有效，但不完全有效。当以零级查询时，我可以获得结果。当使用任何其他选项查询时，IDE 或 powershell session 在尝试对 PtrToStructure 进行编码时只会崩溃。我完全卡住了？
我认为这与结构尺寸有关，但不确定。
如果有人能指出我正确的方向或提供一些技巧，那就太棒了。
NetSessionEnum function
function Get-NetSessions {
param(
[string]$ComputerName = "",
[string]$ComputerSession = "",
[string]$UserName = "",
[int]$QueryLevel
)
$DebugPreference = 'continue'
$signature = @'
[DllImport("netapi32.dll", SetLastError=true)]
public static extern int NetSessionEnum(
[In,MarshalAs(UnmanagedType.LPWStr)] string ServerName,
[In,MarshalAs(UnmanagedType.LPWStr)] string UncClientName,
[In,MarshalAs(UnmanagedType.LPWStr)] string UserName,
Int32 Level,
out IntPtr bufptr,
int prefmaxlen,
ref Int32 entriesread,
ref Int32 totalentries,
ref Int32 resume_handle);
'@
$SessionInfoStructures = @'
namespace pinvoke {
using System;
using System.Runtime.InteropServices;
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct SESSION_INFO_0
{
[MarshalAs(UnmanagedType.LPWStr)]
public String sesi0_cname;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct SESSION_INFO_1
{
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi1_cname;
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi1_username;
public uint sesi1_num_opens;
public uint sesi1_time;
public uint sesi1_idle_time;
public uint sesi1_user_flag;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct SESSION_INFO_2
{
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi2_cname;
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi2_username;
public uint sesi2_num_opens;
public uint sesi2_time;
public uint sesi2_idle_time;
public uint sesi2_user_flags;
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi2_cltype_name;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct SESSION_INFO_10
{
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi10_cname;
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi10_username;
public uint sesi10_time;
public uint sesi10_idle_time;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct SESSION_INFO_502
{
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi502_cname;
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi502_username;
public uint sesi502_num_opens;
public uint sesi502_time;
public uint sesi502_idle_time;
public uint sesi502_user_flags;
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi502_cltype_name;
[MarshalAs(UnmanagedType.LPWStr)]
public string sesi502_transport;
}
public enum NERR
{
/// <summary>
/// Operation was a success.
/// </summary>
NERR_Success = 0,
/// <summary>
/// More data available to read. dderror getting all data.
/// </summary>
ERROR_MORE_DATA = 234,
/// <summary>
/// Network browsers not available.
/// </summary>
ERROR_NO_BROWSER_SERVERS_FOUND = 6118,
/// <summary>
/// LEVEL specified is not valid for this call.
/// </summary>
ERROR_INVALID_LEVEL = 124,
/// <summary>
/// Security context does not have permission to make this call.
/// </summary>
ERROR_ACCESS_DENIED = 5,
/// <summary>
/// Parameter was incorrect.
/// </summary>
ERROR_INVALID_PARAMETER = 87,
/// <summary>
/// Out of memory.
/// </summary>
ERROR_NOT_ENOUGH_MEMORY = 8,
/// <summary>
/// Unable to contact resource. Connection timed out.
/// </summary>
ERROR_NETWORK_BUSY = 54,
/// <summary>
/// Network Path not found.
/// </summary>
ERROR_BAD_NETPATH = 53,
/// <summary>
/// No available network connection to make call.
/// </summary>
ERROR_NO_NETWORK = 1222,
/// <summary>
/// Pointer is not valid.
/// </summary>
ERROR_INVALID_HANDLE_STATE = 1609,
/// <summary>
/// Extended Error.
/// </summary>
ERROR_EXTENDED_ERROR= 1208,
/// <summary>
/// Base.
/// </summary>
NERR_BASE = 2100,
/// <summary>
/// Unknown Directory.
/// </summary>
NERR_UnknownDevDir = (NERR_BASE + 16),
/// <summary>
/// Duplicate Share already exists on server.
/// </summary>
NERR_DuplicateShare = (NERR_BASE + 18),
/// <summary>
/// Memory allocation was to small.
/// </summary>
NERR_BufTooSmall = (NERR_BASE + 23)
}
public enum SESSION_LEVEL
{
/// <summary>
/// ZERO
/// </summary>
LEVEL_0 = 0,
/// <summary>
/// ONE
/// </summary>
LEVEL_1 = 1,
/// <summary>
/// TWO
/// </summary>
LEVEL_2 = 2,
/// <summary>
/// TEN
/// </summary>
LEVEL_10 = 10,
/// <summary>
/// FIVE HUNDRED AND TWO
/// </summary>
LEVEL_502 = 502
}
}
'@
# Add the custom structures and enums
Add-Type $SessionInfoStructures
# Add the function definition
Add-Type -MemberDefinition $signature -Name Win32Util -Namespace Pinvoke -Using Pinvoke
if ([Pinvoke.SESSION_LEVEL]::LEVEL_0 -eq $QueryLevel) {$x = New-Object pinvoke.SESSION_INFO_0}
if ([Pinvoke.SESSION_LEVEL]::LEVEL_1 -eq $QueryLevel) {$x = New-Object pinvoke.SESSION_INFO_1}
if ([Pinvoke.SESSION_LEVEL]::LEVEL_2 -eq $QueryLevel) {$x = New-Object pinvoke.SESSION_INFO_2}
if ([Pinvoke.SESSION_LEVEL]::LEVEL_10 -eq $QueryLevel) {$x = New-Object pinvoke.SESSION_INFO_10}
if ([Pinvoke.SESSION_LEVEL]::LEVEL_502 -eq $QueryLevel) {$x = New-Object pinvoke.SESSION_INFO_502}
# Declare the reference variables
$type = $x.gettype()
Write-Debug "$type.tostring()"
$ptrInfo = 0
$EntriesRed = 0
$TotalRead = 0
$ResumeHandle = 0
# Call the function
$Result = [pinvoke.Win32Util]::NetSessionEnum($ComputerName,$ComputerSession,$UserName,0,[ref]$ptrInfo,-1,[ref]$EntriesRed,[ref]$TotalRead,[ref]$ResumeHandle)
$Result
if ($Result -eq ([pinvoke.NERR]::NERR_Success)){
Write-Debug 'Result is success'
Write-Debug "IntPtr $ptrInfo"
Write-Debug "Entries read $EntriesRed"
Write-Debug "Total Read $TotalRead"
# Locate the offset of the initial intPtr
$offset = $ptrInfo.ToInt64()
Write-Debug "Starting Offset $offset"
# Work out how mutch to increment the pointer by finding out the size of the structure
$Increment = [System.Runtime.Interopservices.Marshal]::SizeOf($x)
Write-Debug "Increment $Increment"
for ($i = 0; ($i -lt $EntriesRed); $i++){
$newintptr = New-Object system.Intptr -ArgumentList $offset
Write-Debug "Newintptr `[$i`] $newintptr"
$Info = [system.runtime.interopservices.marshal]::PtrToStructure($newintptr,$type)
$Info | Select-Object *
$offset = $newintptr.ToInt64()
$offset += $increment
}
}
else
{
# switch ($Result)
# {
# ([Pinvoke.NERR]::ERROR_ACCESS_DENIED) {Write-Host "The user does not have access to the requested information."}
# ([Pinvoke.NERR]::ERROR_INVALID_LEVEL) {Write-Host "The value specified for the level parameter is not valid."}
# ([Pinvoke.NERR]::ERROR_INVALID_PARAMETER) {Write-Host 'The specified parameter is not valid.'}
# ([Pinvoke.NERR]::ERROR_MORE_DATA) {Write-Host 'More entries are available. Specify a large enough buffer to receive all entries.'}
# ([Pinvoke.NERR]::ERROR_NOT_ENOUGH_MEMORY) {Write-Host 'Insufficient memory is available.'}
# ([Pinvoke.NERR]::NERR_ClientNameNotFound) {Write-Host 'A session does not exist with the computer name.'}
# ([Pinvoke.NERR]::NERR_InvalidComputer) {Write-Host 'The computer name is not valid.'}
# ([Pinvoke.NERR]::NERR_ClientNameNotFound) {Write-Host 'The user name could not be found.'}
# }
}
}
Get-NetSessions -QueryLevel 0
最佳答案
我早就放弃了上述内容并转向其他事情，直到某件事再次引起了我的兴趣。
https://support.microsoft.com/en-us/help/2909958/exceptions-in-windows-powershell-other-dynamic-languages-and-dynamical
添加这个非常小的修改时，上面的代码工作(没有抛出错误):
$Info = [system.runtime.interopservices.marshal]::PtrToStructure($newintptr,$type)
$Info = [system.runtime.interopservices.marshal]::PtrToStructure($newintptr,[System.Type]$type)
感谢 NullBind 的回复，非常感谢。
关于enums - 在 powershell 中使用 add-type 处理 intPtr 和编码，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12451246/