How to translate legacy (OLE) colors to (A)RGB with .NET?
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02-10-2019 - |
Pergunta
I have a list of color values encoded as signed integers (OLE I think) in a legacy INI file that I need to translate into (A)RGB values with .NET. An INI example:
[INI_Section] Color=-2147483633
Doing something like:
Color.FromArgb(-2147483633)
gives an alpha-blended version of a color that is not at all what I expect. I think that a value like -2147483633 is supposed to represent a system-defined, or named color like ButtonFace. Is there a .NET method for translating these legacy colors properly? Note that pInvoke to OlePro32.dll is not an option.
Solução
You can use ColorTranslator.FromOle to do the conversion.
http://msdn.microsoft.com/en-us/library/system.drawing.colortranslator.fromole.aspx
Outras dicas
If from some reason you cannot use System.Drawing lib (e.g. in Azure function) than you can calculate like this:
var ole = 6579300;
var red = ole % 256;
var green = (ole / 256) % 256;
var blue = (ole / 65536) % 256;
var backToOle = red + (green * 256) + (blue * 256 * 256);