The DISPLAY_DEVICE structure receives information about the display device specified by the iDevNum parameter of the EnumDisplayDevices function.

C# Definition:

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
public struct DISPLAY_DEVICE
{
      [MarshalAs(UnmanagedType.U4)]
      public int cb;
      [MarshalAs(UnmanagedType.ByValTStr, SizeConst=32)]
      public string DeviceName;
      [MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
      public string DeviceString;
      [MarshalAs(UnmanagedType.U4)]
      public DisplayDeviceStateFlags StateFlags;
      [MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
      public string DeviceID;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
      public string DeviceKey;
}

VB.NET Definition:

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi)> _
Public Structure DISPLAY_DEVICE
    <MarshalAs(UnmanagedType.U4)> _
    Public cb As Integer
    <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=32)> _
    Public DeviceName As String
    <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=128)> _
    Public DeviceString As String
    <MarshalAs(UnmanagedType.U4)> _
    Public StateFlags As DisplayDeviceStateFlags
    <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=128)> _
    Public DeviceID As String
    <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=128)> _
    Public DeviceKey As String
        [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
        public class DISPLAY_DEVICE {
              public int cb=0;
            [MarshalAs(UnmanagedType.ByValTStr,SizeConst=32)]
              public string DeviceName=new String(' ',32);
            [MarshalAs( UnmanagedType.ByValTStr, SizeConst=128)]
              public string DeviceString=new String(' ',128);
              public int StateFlags=0;
            [MarshalAs( UnmanagedType.ByValTStr, SizeConst=128)]
              public string DeviceID=new String(' ',128);
            [MarshalAs( UnmanagedType.ByValTStr, SizeConst=128)]
              public string DeviceKey=new String(' ',128);
        }

VB Definition:

Structure DISPLAY_DEVICE
   Public TODO
End Structure

User-Defined Field Types:

None.

User-Defined Types

DisplayDeviceStateFlags

Notes:

Used with EnumDisplayDevices

None.

Works much better on Win7 with CharSet=CharSet.Auto. Suspect this is true of a bunch of other structs defined on this site as well as with at least a few predecessors of Win7.

On my Windows 7 I build for x86 I need to use CharSet.Ansi, thats why I revert it back. Feel free and try for yourself.

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