pinvoke.net: Edit: Structures.COLORREF

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Summary: The COLORREF value is used to specify or retrieve an RGB color.

!!!!C# Definition:
 [StructLayout(LayoutKind.Sequential)]
 struct COLORREF {
   public byte R;
   public byte G;
   public byte B;
 }

// Alternate
 [StructLayout(LayoutKind.Sequential)]
 public struct COLORREF
 {
   public uint ColorDWORD;

public COLORREF(System.Drawing.Color color)
   {
      ColorDWORD = (uint) color.R + (((uint) color.G) << 8) + (((uint) color.B) << 16);
   }

public System.Drawing.Color GetColor()
   {
      return System.Drawing.Color.FromArgb((int) (0x000000FFU & ColorDWORD),
         (int) (0x0000FF00U & ColorDWORD) >> 8, (int) (0x00FF0000U & ColorDWORD) >> 16);
   }

public void SetColor(System.Drawing.Color color)
   {
      ColorDWORD = (uint) color.R + (((uint) color.G) << 8) + (((uint) color.B) << 16);
   }
 }

// Alternate
    [StructLayout(LayoutKind.Explicit, Size = 4)]
    public struct COLORREF {
        public COLORREF(byte r, byte g, byte b) {
            this.Value = 0;
            this.R = r;
            this.G = g;
            this.B = b;
        }

public COLORREF(uint value) {
            this.R = 0;
            this.G = 0;
            this.B = 0;
            this.Value = value & 0x00FFFFFF;
        }

[FieldOffset(0)]
        public byte R;
        [FieldOffset(1)]
        public byte G;
        [FieldOffset(2)]
        public byte B;

[FieldOffset(0)]
        public uint Value;
    }

!!!!VB Definition:
 Structure COLORREF 
     Public R As Byte
     Public G As Byte
     Public B As Byte

Public Overrides Function ToString() As String
         Return String.Format("({0},{1},{2})", R, G, B)
     End Function
 End Structure
!!!!User-Defined Field Types:
None.

!!!!Notes:
Actually, there's no COLORREF structure in native Win32. It is typedef-ed to DWORD, which means that in the managed world its direct counterpart is System.Int32@msdn (aka int in C#). So, when faced with interop involving COLORREF'S you'd better treat them as int's. Also have in mind that the color components are stored in reverse order, i.e. the Red component is in the lowest-byte. In short, the format is 0x00BBGGRR. You can use a code similar to the following to obtain a COLORREF:
 private static int MakeCOLORREF(byte r, byte g, byte b)
 {
 	return  (int) (((uint)r) | ( ((uint)g) <<8 ) |  ( ((uint)b) << 16 ));
 }

!!!!Notes2:
For converting COLORREF from and to .net's Color use 'ColorTranslator.ToWin32' and 'ColorTranslator.FromWin32' methods.

Documentation: COLORREF@msdn on MSDN