HTML Help keyword lookup

Question

I\'m having trouble figuring out how to get keyword lookups (HH_KEYWORD_LOOKUP) to work in HTML Help. If I have an index that displays like this:

Machine
           


        

Answer 1

I think I read (in my many google searches) that HH_KEYWORD_LOOKUP is broken in HTML help, sigh. So Ie came up with this solution to do a search. It will bring up the chm file and enter the keyword into the search box and press the ENTER key to manually do the search.

procedure PostKey(aKey: Word; const aShift: TShiftState; aSpeciaKey: Boolean);
type
  TShiftKeyInfo = record
    shift: Byte;
    vkey: Byte;
  end;
  byteset = set of 0..7;
const
  shiftkeys: array [1..3] of TShiftKeyInfo =
    ((shift: Ord(ssCtrl); vkey: VK_CONTROL),
    (shift: Ord(ssShift); vkey: VK_SHIFT),
    (shift: Ord(ssAlt); vkey: VK_MENU));
var
  flag: DWORD;
  bShift: ByteSet absolute aShift;
  i: Integer;
begin
  for i := 1 to 3 do
  begin
    if shiftkeys[i].shift in bShift then
      keybd_event(shiftkeys[i].vkey, MapVirtualKey(shiftkeys[i].vkey, 0), 0, 0);
  end; { For }
  if aSpeciaKey then
    flag := KEYEVENTF_EXTENDEDKEY
  else
    flag := 0;
  keybd_event(aKey, MapvirtualKey(aKey, 0), flag, 0);
  flag := flag or KEYEVENTF_KEYUP;
  keybd_event(aKey, MapvirtualKey(aKey, 0), flag, 0);
  for i := 3 downto 1 do
  begin
    if shiftkeys[i].shift in bShift then
      keybd_event(shiftkeys[i].vkey, MapVirtualKey(shiftkeys[i].vkey, 0),
        KEYEVENTF_KEYUP, 0);
  end; { For }
end;

procedure CHMSearch(aCHMFilename, aSearch: string);
var
  cfn: string;
  qry: THHFtsQuery;
  hnd: HWND;

  procedure DoSearch(aMsg: string);
  var
    i,n: Integer;
    c: Char;
    shift: TShiftState;
  begin
    if hnd = 0 then Exit;
    Windows.SetFocus(hnd);
    n := Length(aMsg);
    if n > 0 then
    begin
      for i := 1 to n do
      begin
        c := aMsg[i];
        shift := [];
        case c of
          'a'..'z': shift := [];
          'A'..'Z': shift := [ssShift];
          '_': // underscore key
          begin
            keybd_event(VK_SHIFT, 0, 0, 0);
            keybd_event(VK_OEM_MINUS, 0, 0, 0);
            keybd_event(VK_OEM_MINUS, 0, KEYEVENTF_KEYUP, 0);
            keybd_event(VK_SHIFT, 0, KEYEVENTF_KEYUP, 0);
            continue;
          end;
          '$': // $ key
          begin
            PostKey(Ord('4'), [ssShift], False);
            continue;
          end;

        end;
        PostKey(Ord(UpCase(c)), shift, False);
      end;
      PostKey(VK_RETURN, [], False);
      PostKey(VK_RETURN, [], False);
    end;
  end;

begin
  cfn := ChangeFileExt(aCHMFilename, '.chm');
  FillChar(qry, SizeOf(qry), 0);
  qry.cbStruct := SizeOf(THHFtsQuery);
  qry.fExecute := TRUE;
  HH.HtmlHelpA(GetDesktopWindow, PAnsiChar(AnsiString(cfn)), HH_DISPLAY_TOC, 0);
  hnd := HH.HtmlHelpA(GetDesktopWindow, PAnsiChar(AnsiString(cfn)), HH_DISPLAY_SEARCH,
    Cardinal(@qry));
  DoSearch(aSearch);
end;