怎样判断鼠标左键或者右键 是否正被按下？？

Question

不要说Click事件。 我需要主动读取 鼠标状态。

Answer 1

function HookMouseProc(iCode: Integer; wParam: WPARAM; lParam: LPARAM): LRESULT;stdcall;
var
 pMouseHook: MOUSEHOOKSTRUCT; 
begin
  if iCode >= 0 then
  begin
  case wParam of
      WM_MOUSEMOVE:
      begin
        pMouseHook := pMOUSEHOOKSTRUCT(lparam)^;
        PostMessage(g_hDestWnd, SHOW_MENU_MSG, pMouseHook.pt.X, pMouseHook.pt.Y);
      end;
      WM_LBUTTONDOWN: // 左键
      begin      end;
      WM_RBUTTONDOWN: // 右键
      begin      end;
    end;
  end;
  
  Result := CallNextHookEx(g_hHook, iCode, wParam, lParam);
end;