powershell捕获wmi查询的异常代码 [英] powershell catch exception codes for wmi query

问题描述

我正在一组电脑上检查使用WMI的服务，但有一些我收到错误。查询是

 
 
 
 
 code> $ listOfServices = Get-WmiObject -credential $ wsCred -ComputerName $ comp.name -Query从win32_Service中选择名称，状态
  

如果我得到以下内容，我想尝试替代凭据

  Get-WmiObject：Access被拒绝。 （HRESULT的异常：0x80070005（E_ACCESSDENIED））
  

如果我得到 Get- WmiObject：用户凭据不能用于本地连接我要删除凭据

如果我得到 Get-WmiObject ：RPC服务器不可用。 （从HRESULT的异常：0x800706BA）或任何其他错误我只想报告错误。

我知道我应该使用一个尝试catch块，但我不知道如何为每个异常指定一个catch。

这是我到目前为止 -

  try {
 $ listOfServices = Get-WmiObject -credential $ wsCred -ComputerName $ comp.name -Query从win32_Service中选择名称，状态-ErrorAction Stop 
} 
 catch {
 $ e = $ _。异常
开关（$ e.ErrorCode）{
 0x80070005 {
 $ listOfServices = Get-WmiObject-credential $ svrCred -ComputerName $ comp.name -Queryselect name，state from win32_Service-ErrorAction Stop 
} 
 default {
 write错误代码：$ e.ErrorCode
写错误详细信息：$ e.ErrorDetails
 write完整错误：$ e
} 
} 
} 
  pre> 
 
解决方案
错误号存储在异常的 HResult 属性中。请注意，您需要将错误操作设置为停止以使WMI错误可捕获：
  $ ErrorActionPreference ='Stop'
 try {
 Get-WmiObject ... 
} catch {
 $ e = $ _例外
开关（$ e.HResult）{
 0x80070005 {...} 
默认{throw $ e} 
} 
} 
  
 
I am checking for services using WMI on a group of computers but with some I am getting errors. How do I capture these errors so I can take approptiate action?

The query is 
$listOfServices = Get-WmiObject -credential $wsCred -ComputerName $comp.name -Query "Select name, state from win32_Service"
If I get the following I want to try alternative credentials
Get-WmiObject : Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED)) 
If I get Get-WmiObject : User credentials cannot be used for local connections I want to remove the credentials

If I get Get-WmiObject : The RPC server is unavailable. (Exception from HRESULT: 0x800706BA) or any other error I just want to report back the error.

I know I should be using a try catch block but I do not know how to specify a catch for each exception.

Here is what I have so far -
try {
    $listOfServices = Get-WmiObject -credential $wsCred -ComputerName $comp.name -Query "Select name, state from win32_Service" -ErrorAction Stop
}
catch {
    $e = $_.Exception
    switch ($e.ErrorCode) {
        0x80070005 {
                $listOfServices = Get-WmiObject -credential $svrCred -ComputerName $comp.name -Query "Select name, state from win32_Service" -ErrorAction Stop
        }
        default { 
            write "Error code: $e.ErrorCode"
            write "Error details: $e.ErrorDetails"
            write "Full error: $e"
        }
    }
}

解决方案
The error number is stored in the HResult property of the exception. Note that you need to set the error action to Stop to make WMI errors catchable:
$ErrorActionPreference = 'Stop'
try {
  Get-WmiObject ...
} catch {
  $e = $_.Exception
  switch ($e.HResult) {
    0x80070005 { ... }
    default    { throw $e }
  }
}


                        
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