Question

I want to convert an object Color, to Int, to put him in crTextColor member, so I used the method myColor.ToArgb(), but the color changes, and displays a different color.

Why is this happening?

this is the code:

      CHARFORMAT2 fmt = new CHARFORMAT2();
      fmt.cbSize = Marshal.SizeOf(fmt);
      // check if the text contains CFE_AUTOCOLOR effect
      SendMessage(new HandleRef(this, Handle), EM_GETCHARFORMAT, SCF_SELECTION, ref fmt);
      if ((fmt.dwEffects & CFE_AUTOCOLOR) == CFE_AUTOCOLOR)
      {
          fmt.dwEffects -= CFE_AUTOCOLOR;
      }
      fmt.dwMask = CFM_COLOR;
      Color c = Color.Red;
      fmt.crTextColor =  c.ToArgb();
      SendMessage(new HandleRef(this, Handle), EM_SETCHARFORMAT, SCF_SELECTION, ref fmt);

Answer 1

This works fine. Are you doing something different?

int crTextColor;

public Form1()
{
    InitializeComponent();
    BackColor = Color.Aqua;
    crTextColor = BackColor.ToArgb();//To number
    Text = crTextColor.ToString();
}

private void button1_Click(object sender, EventArgs e)
{
    BackColor = Color.FromArgb(crTextColor);//From number
}

EDIT: (After seeing your edit)

OK. So you got me there, I don’t really know this stuff. But:

If you go to MSDN’s page on CHARFORMAT2 here http://msdn.microsoft.com/en-us/library/windows/desktop/bb787883%28v=vs.85%29.aspx and search in it for crTextColoryou’ll find (as the fifth case) the explanation to it. It says its type is: COLORREF . If you’ll click on that link – it says that it is RGB. Clicking on the RGB link there goes to here http://msdn.microsoft.com/en-us/library/windows/desktop/dd162937%28v=vs.85%29.aspx which says:

 C++

COLORREF RGB(
  BYTE byRed,
  BYTE byGreen,
  BYTE byBlue
);

On the other hand – if you go here http://msdn.microsoft.com/en-us/library/system.drawing.color.toargb.aspx you see (in “remarks”) that Color.ToArgbis ARGB :

“The most significant byte (MSB), represented by AA, is the alpha
component value.”

So perhaps that’s the problem. But, again, I don’t really know this stuff! I just did some searching.