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C# problem using the GetVersionExA API.

Posted on 2004-09-28
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Last Modified: 2008-01-09
Hi.
I'm trying to determine if the operating system is a domain controller using the GetVersionExA function and OSVERSIONINFOEX struct
I tried the exact same code in VB.NET and it worked just fine, but it doesn't in C#.
Any ideas?

Here is the code I have:
[StructLayout(LayoutKind.Sequential)]
public struct OSVERSIONINFOEX
{
      [MarshalAs(UnmanagedType.U4)]
      public int dwOSVersionInfoSize;
      [MarshalAs(UnmanagedType.U4)]
      public int dwMajorVersion;
      [MarshalAs(UnmanagedType.U4)]
      public int dwMinorVersion;
      [MarshalAs(UnmanagedType.U4)]
      public int dwBuildNumber;
      [MarshalAs(UnmanagedType.U4)]
      public int dwPlatformId;
      [MarshalAs(UnmanagedType.LPTStr, SizeConst=128)]
      public string szCSDVersion;
      [MarshalAs(UnmanagedType.U2)]
      public short wServicePackMajor;
      [MarshalAs(UnmanagedType.U2)]
      public short wServicePackMinor;
      [MarshalAs(UnmanagedType.U2)]
      public short wSuiteMask;
      public byte wProductType;
      public byte wReserved;
}

[DllImport("kernel32.dll", SetLastError = true)]
public static extern bool GetVersionExA([MarshalAs(UnmanagedType.Struct)] ref OSVERSIONINFOEX lpVersionInfo);

public bool IsDomainController()
{
bool isDC = false;
OSVERSIONINFOEX os = new OSVERSIONINFOEX();
os.dwOSVersionInfoSize = Marshal.SizeOf(os);
if (GetVersionExA(ref os))
{
      isDC = (os.wProductType == 2);
}
else
{
      Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}

return isDC;
}

Any help would be greatly appreciated!
0
Comment
Question by:Balder1978
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14 Comments
 
LVL 96

Expert Comment

by:Bob Learned
ID: 12173937
Try something like this instead:

string osVersion = Environment.OSVersion.Platform.ToString();

Bob
0
 
LVL 2

Author Comment

by:Balder1978
ID: 12180802
I don't need the OS version, I need to know if it's a Domain Controller or not.
But thanks for the input!
0
 
LVL 96

Expert Comment

by:Bob Learned
ID: 12181098
Do you still have the VB.NET code?

Bob
0
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LVL 2

Author Comment

by:Balder1978
ID: 12181126
sure:

<StructLayout(LayoutKind.Sequential)> _
Public Structure OSVERSIONINFOEX
        <MarshalAs(UnmanagedType.U4)> _
        Public dwOSVersionInfoSize As Integer
        <MarshalAs(UnmanagedType.U4)> _
        Public dwMajorVersion As Integer
        <MarshalAs(UnmanagedType.U4)> _
        Public dwMinorVersion As Integer
        <MarshalAs(UnmanagedType.U4)> _
        Public dwBuildNumber As Integer
        <MarshalAs(UnmanagedType.U4)> _
        Public dwPlatformId As Integer
        <MarshalAs(UnmanagedType.ByValArray, SizeConst:=128)> _
        Public szCSDVersion() As Char
        <MarshalAs(UnmanagedType.U2)> _
        Public wServicePackMajor As Short
        <MarshalAs(UnmanagedType.U2)> _
        Public wServicePackMinor As Short
        <MarshalAs(UnmanagedType.U2)> _
        Public wSuiteMask As Short
        Public wProductType As Byte
        Public wReserved As Byte
End Structure

Private Declare Function GetVersionEx Lib "kernel32.dll" Alias "GetVersionExA" (<MarshalAs(UnmanagedType.Struct)> ByRef ByReflpVersionInfo As OSVERSIONINFOEX) As Boolean

Usage:
Dim os As OSVERSIONINFOEX = New OSVERSIONINFOEX
os.dwOSVersionInfoSize = Marshal.SizeOf(os)
GetVersionEx(os)
0
 
LVL 96

Expert Comment

by:Bob Learned
ID: 12181180
In VB.NET, the os.dwOSVersionInfoSize = 156, and in C#, it is 32.  Investigating...

Bob
0
 
LVL 2

Author Comment

by:Balder1978
ID: 12181203
Exactly, and if I set it manually to 156 (which is too dirty programming), I get the OS version numbers, but not the wProductType wich is what I'm looking for.
Thanks!
0
 
LVL 96

Expert Comment

by:Bob Learned
ID: 12181246
The OSVERSIONINFOEX.szCSDVersion appears to be the problem.

In the VB.NET IL code:

szCSDVersion public marshal (fixed array[128]) char[]

In the C# IL code:

szCSDVersion public marshal (lptstr) string

There is clearly a size difference here.

Bob
0
 
LVL 96

Accepted Solution

by:
Bob Learned earned 500 total points
ID: 12181278
Change to this:

      [MarshalAs(UnmanagedType.ByValArray , SizeConst=128)]
      public char[] szCSDVersion;

Bob
0
 
LVL 2

Author Comment

by:Balder1978
ID: 12181308
that didn't work, but this did:

[MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
public string szCSDVersion;

The size is now 156, but it still doesn't work...
0
 
LVL 96

Expert Comment

by:Bob Learned
ID: 12181348
It worked for me--return a false.  What .NET version do you have?  I have 2003.

Bob
0
 
LVL 2

Author Comment

by:Balder1978
ID: 12181920
I have 2003 with .NET 1.1 SP1 too... Strange...
0
 
LVL 96

Expert Comment

by:Bob Learned
ID: 12181938
What happened when you used this?

[MarshalAs(UnmanagedType.ByValArray , SizeConst=128)]
      public char[] szCSDVersion;


Bob
0
 
LVL 2

Author Comment

by:Balder1978
ID: 12181952
So sorry, didn't change public char[] szCSDVersion;
I'll test it and get back to u ASAP.
0
 
LVL 2

Author Comment

by:Balder1978
ID: 12182176
Thanks alot, man. Works great!
0

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