public static void ShowPopup2(Control parent, string caption, Point location, Font font = null, Color?backColor = null, Color?foreColor = null)
{
font = font ?? SystemFonts.CaptionFont;
backColor = backColor ?? Color.FromKnownColor(KnownColor.Window);
foreColor = foreColor ?? Color.FromKnownColor(KnownColor.WindowText);
var popup = new HH_POPUP();
popup.clrBackground = new COLORREF(backColor.Value);
popup.clrForeground = new COLORREF(foreColor.Value);
popup.pt = new POINT(location);
var pszText = Marshal.StringToCoTaskMemAuto(caption);
popup.pszText = pszText;
var pszFont = Marshal.StringToCoTaskMemAuto(
$"{font.Name}, {font.Size}, , " +
$"{(font.Bold ? "BOLD" : "")}" +
$"{(font.Italic ? "ITALIC" : "")}" +
$"{(font.Underline ? "UNDERLINE" : "")}");
popup.pszFont = pszFont;
try
{
HtmlHelp(parent.Handle, null, HTMLHelpCommand.HH_DISPLAY_TEXT_POPUP, popup);
}
finally
{
Marshal.FreeCoTaskMem(pszText);
Marshal.FreeCoTaskMem(pszFont);
}
}
public static extern int HtmlHelp(IntPtr hwndCaller, string pszFile, int uCommand, HH_POPUP dwData);
static extern int HtmlHelp(IntPtr hWndCaller,
[MarshalAs(UnmanagedType.LPWStr)] string pszFile,
HTMLHelpCommand uCommand,
[MarshalAs(UnmanagedType.LPStruct)] HH_POPUP dwData);
