C# Signature:

[System.Runtime.InteropServices.DllImport("shlwapi.dll")]
static extern void ColorRGBToHLS(int RGB, ref int H, ref int L, ref int S);

VB.Net Signature:

<System.Runtime.InteropServices.DllImport("shlwapi.dll", EntryPoint:="ColorRGBToHLSW", SetLastError:=True, CharSet:=System.Runtime.InteropServices.CharSet.Unicode)>
Private Shared Sub ColorRGBToHLS(RGB As Integer, ByRef H As Integer, ByRef L As Integer, ByRef S As Integer)
End Sub

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

In VB .NET you can get the H, S, and B or L values from then color structure:

'B, Brightness, a.k.a L Lightness, Luminance

DIM red as Color = Color.FromArbg(255,255,0,0)

DIM H, S, B As Single

H = red.GetHue

S = red.GetSaturation

B = red.GetBrightness

Sample Code:

  using System;
  using System.Drawing;
  using System.Runtime.InteropServices;
  sealed class Win32
  {
    [DllImport("shlwapi.dll")]
    static extern void ColorRGBToHLS(int RGB, ref int H, ref int L, ref int S);

    //
    //Convert System.Drawing.Color structure to HLS.
    //
    static public void ColorToHLS(System.Drawing.Color C,ref int H,ref int L,ref int S)
    {
      //
      //Use ColorTranslator.ToWin32 rather than Color.ToArgb because we need 0x00BBGGRR,
      //which is returned by ToWin32, rather than 0x00RRGGBB, which is returned by ToArgb.
      //
      ColorRGBToHLS(ColorTranslator.ToWin32(C), ref H, ref L, ref S);
    }
  }

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).