這是我從網上抓到的部分碼:
----------------------------------------------------------DLL
function MseHookFunc(Code, mMsg: Integer; var MouseRec: TMOUSEHOOKSTRUCT): Integer; stdcall;
var
Pos: Integer;
reVal: SmallInt;
begin

Result := 0;
if Code = HC_NOREMOVE then Exit;
Result := CallNextHookEx(0, Code, mMsg, Integer(@MouseRec));
if (Code < 0) or (Code <> HC_ACTION) or IsBadCodePtr(pFHandle) then Exit;
reVal := MouseRec.pt.x;
Pos := Word(reVal);
reVal := MouseRec.pt.y;
Pos := Pos or (Word(reVal) shl 16);
mMsg := mMsg or (Integer(MouseRec.dwExtraInfo) shl 16);
PostMessage(pFHandle^, MseMsg, mMsg, Pos);
end;
-----------------------------------------------------------------------------------------------------AP
procedure TForm1.HookMsgMse(var Msg1: TMessage);
var
Str1: String;
begin

if Msg1.wParamLo = WM_MOUSEWHEEL then
begin
zDelta:=Msg1.WParamHi;
Str1 := 'mouseWheel - ' IntToStr(SmallInt(Msg1.wParamHi));
Memo1.Lines.Add(Str1);
Exit;


我看它有把wParam的值傳出去啊 可是為什麼Msg1.WParamHi怎麼不是120或是-120 都是0呢

哪位大大可以幫忙 謝謝
J