pinvoke.net: Edit: kernel32.GetWindowsDirectory

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Summary: The GetWindowsDirectory API

!!!!C# Signature:
 [DllImport("kernel32.dll", SetLastError=true, CharSet=CharSet.Auto)]
 static extern uint GetWindowsDirectory(StringBuilder lpBuffer,
   uint uSize);
!!!!VB.NET Signature
 <DllImport("kernel32.dll", SetLastError:=true, EntryPoint:="GetWindowsDirectoryW", CharSet:=CharSet.Unicode)> _
 Public Function GetWindowsDirectory(<MarshalAs(UnmanagedType.LPTSTR)>lpBuffer As System.Text.StringBuilder, _
                                   uSize As UInteger ) As UInteger
 End function
!!!!VB Signature
 Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" _
   (ByVal Buffer As String, ByVal Size As Integer) As Integer
!!!!User-Defined Types:
None.

!!!!Notes:
Q. For the above VB DllImport declaration,  Visual Studio's Code Analysis throws error 'CA2101: Specify marshaling for P/Invoke string arguments'. 
Should the marshalling not be: <MarshalAs(UnmanagedType.LPWStr)> Otherwise lpBuffer will be converted to Ansi and then passed to a Unicode API method.

!!!!Tips & Tricks:
Please add some!

Here are two ways to get the Windows path

Private Sub test()
      Dim sSystemPath As String = System.Environment.GetFolderPath(Environment.SpecialFolder.System)
      MessageBox.Show(sSystemPath.Substring(0, sSystemPath.LastIndexOf("\")))
      MessageBox.Show(System.Environment.GetEnvironmentVariable("windir"))
   End Sub

!!!!VB Sample Code:
   As SDim WinDir tring = Space(255)
   Dim Res As Integer = GetWindowsDirectory(WinDir, WinDir.Length)
   WinDir = WinDir.Substring(0, Res)
!!!!VB.NET Sample Code:
 Shared Function wins() As String
     Dim sb As StringBuilder =new StringBuilder(100)
     Dim f as UInteger = 100
     GetWindowsDirectory(sb,i)
     return sb.ToString()  
 End Function

!!!!C# Sample Code:
   const int MaxPathLength = 255;
   StringBuilder sb = new StringBuilder(MaxPathLength);
   int len = (int)GetWindowsDirectory(sb, MaxPathLength);
   _windowsDirectory = sb.ToString(0, len);

!!!!C# Sample Code (Alternative):

static string wins()
 {
     StringBuilder sb =new StringBuilder(100);
     int i = 100; uint f;
     GetWindowsDirectory(sb,ref  i);
     return sb.ToString()  ;
 }

!!!!Alternative Managed API:

Environment.GetEnvironmentVariable("windir");

Documentation: GetWindowsDirectory@msdn on MSDN