private int GetCharIndexFromPos(int x, int y)
{
var p = new User32.POINTL {
X = x, Y = y
};
int rawSize = Marshal.SizeOf(typeof(User32.POINTL));
IntPtr lParam = Marshal.AllocHGlobal(rawSize);
Marshal.StructureToPtr(p, lParam, false);
int r = User32.SendMessage(this.Handle, (int)User32.Msgs.EM_CHARFROMPOS, 0, lParam);
Marshal.FreeHGlobal(lParam);
return(r);
}
private Point GetPosFromCharIndex(int ix)
{
int rawSize = Marshal.SizeOf(typeof(User32.POINTL));
IntPtr wParam = Marshal.AllocHGlobal(rawSize);
int r = User32.SendMessage(this.Handle, (int)User32.Msgs.EM_POSFROMCHAR, (int)wParam, ix);
User32.POINTL p1 = (User32.POINTL)Marshal.PtrToStructure(wParam, typeof(User32.POINTL));
Marshal.FreeHGlobal(wParam);
var p = new Point {
X = p1.X, Y = p1.Y
};
return(p);
}