[PowerShell每日技巧]读取包含扩展字符(如%SystemRoot%)的注册表键值(20140210)

DAIC

When you read a Registry value of type StringExpand, it will always automatically expand any environment variables contained in the text.

This example will read the system device path from your Registry:

1. $path = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion'
   
2. $key = Get-ItemProperty -Path $path
   
3. $key.DevicePath

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The result will be an actual path. That is OK unless you wanted to get the original (unexpanded) Registry value. Here is the example that reads the original value:

1. $path = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion'
   
2. $key = Get-Item -Path $path
   
3. $key.GetValue('DevicePath', '', 'DoNotExpandEnvironmentNames')

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Accessing Registry values this way will get you another valuable piece of information: you can now also find out the value's data type:

1. $path = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion'
   
2. $key = Get-Item -Path $path
   
3. $key.GetValueKind('DevicePath')

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http://powershell.com/cs/blogs/tips/archive/2014/02/10/reading-stringexpand-registry-values.aspx