ColorRGBToHLS Function usage

[mhartman1]

Hello: Can anyone tell me the correct way to call the following API function:

Public Declare Function ColorRGBToHLS Lib "shlwapi.dll" (ByVal clrRGB As Long,
pwHue As Long, pwLuminance As Long, pwSaturation As Long) As Long

As a start, what is the "clrRGB" expecting? a hex value maybe? Or does a special word have to be assemble for this parameter?

Also, I am assuming that the pwHue, pwLuminance and pwSaturation paramenters are the values being returned, but I cannot get past the "clrRgb" part

Many thanks in advance
Mark

 

[Hypetia]

clrRGB is the RGB color value. It's simply a long integer which holds a 24-bit color value (R, G, B) in lower 3 bytes. You can pass a color as a long integer, or use hex representation. For instance, the RGB value of red is 255 (&H0000FF&) and that of yellow is 65535 (&H00FFFF&).

You can pass color values from various sources, including:
[ul][li] A color returned by VB's RGB function.[/li]
[li] A 'ColorConstant' (vbBlue, vbMagenta, vbGreen etc.)[/li]
[li] A color returned by VB's Point method (Form.Point, PictureBox.Point)[/li]
[li] A color returned by the Color property of the Common Dialog Box.[/li]
[li] A color returned by an API function, for example, GetPixel function.[/li][/ul]

You cannot pass a 'SystemColorConstant' like 'vbButtonFace'.

A keyword search in this forum will lead you to at least following two threads.
thread222-1094943
thread222-1156289

 

[mhartman1]

Thanks Hypetia for taking the time to respond. This has helped me very much.

Kind regards
Mark