TweetFollow Us on Twitter

Detect Multifinder
Volume Number:6
Issue Number:3
Column Tag:TechNotes

Related Info: OS Utilities

Detecting MultiFinder

By Paul Davis, Dunedin, New Zealand

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

Detecting MultiFinder from THINK Pascal

I am currently engaged in researching Mac language technology for the application of expert systems to the finance industry. I’ve been involved in IBM PC software since 1983, and managed the company which developed and released Pertmaster Advance, a project management package, on that platform. Since buying my first 128k Mac I’ve been interested in the potential of the Mac. With the release of the Mac II, I began working with Mac software full time.

I am convinced that OOP is here to stay, and using THINK Pascal V2.0 to explore it. After a brief exposure to MacApp I started writing a smaller MultiFinder friendly OOP application shell I’m calling MiniMac, working from the Apple demo programs OOPTextEdit and Events, the class structures of Coral LISP, Prograph, and SmallTalk; and any other Mac system class structures I can find.

While doing this, I noticed that it is useful when trying to decide how to deal with DA’s and activate events to be able to tell if MultiFinder is running, and not just if _WaitNextEvent is implemented as Apple DTS seems to think. If MultiFinder is running you can depend on resume, suspend and mouse-moved events. With just Finder running you have to use some other scheme to handle the cursor and detect whether an activate involves scrap conversion.

Noticing that one of the tech notes mentions that mouse-moved events are received as long as the mouse is outside the cursorRgn provided in a WaitNextEvent call, I wrote the following small routine. For my purposes it works beautifully.

By the way, you have to compile it into a standalone application to try it, THINK never passes my applications any app4 events while running under MultiFinder. I’ve tried it and it works great on my system: MacSE with 2.5Mb Ram, Radius 68020,68881 and TPD, System Software 6.0.3.

Explanation of the Code:

Multifinder test: hasWaitNextEvent is a boolean function set by the normal checking of the _WaitNextEvent trap described in Tech Notes and repeated below. If it is not true then MultiFinder couldn’t be running anyway. If WNE is implemented then I create a new region, which according to Inside Mac is set to a (0,0,0,0) rectangle. The mouse couldn’t be in there, so I do WNE’s with that region for kTries times or until I get an App4 (MultiFinder) event. I found that on my system I receive 4 null events before I get an App4 event so kTries of 10 works fine. You may need to experiment for an absolutely safe number of tries.

Shortcomings: You lose the first kTries events when your application is launched. This shouldn’t be critical, as applications generally flush the event queue anyway. Hasn’t been a problem for me anyway. You probably should use this routine before you put up any windows or other screen items so you don’t lose any update or activate events.

{1}

function multiFinderTest: Boolean;
{ a little event loop to test for MF }
{ if MF is running we are sure to get }
{ mouse-moved events with a tiny region }
  const
    kTries = 10;
{ number of events to check for mouse event }
  var
    mouseRgn: RgnHandle;
    count: Integer;
    gotEvent: Boolean;
    theEvent: EventRecord;
  begin
    multiFinderTest := False;
    { assume false }
    if hasWaitNextEvent then
    { otherwise always false }
      begin
        debugBanner(‘has WaitNextEvent’);
        gotEvent := False;
        count := 1;
        mouseRgn := NewRgn;
        { should be empty region (0,0,0,0) }
        while (gotEvent = False) and 
              (count < kTries) do
          begin
            gotEvent := WaitNextEvent(        
           EveryEvent, theEvent, 0, mouseRgn);
            if theEvent.what = app4Evt then
              multiFinderTest := True;
            count := count + 1;
          end;
        DisposeRgn(mouseRgn);
      end;
  end; { multiFinderTest }

Since THINK won’t give you MultiFinder events you have to have a way to check on what is going on from outside the THINK environment. The following routine displays a little box with a message in it without messing up the event queue or MultiFinder levels like an alert did. In the above routine I insert a:

{2}

debugBanner(StringOf(‘MultiFinder found after ‘,count,’ tries.’));

in the innermost if. This routine requires a WIND resource of convenient size and I use a proc of 2 though others would do. You can also use it to check the type of events coming through and debug your detection of mouse moved, resume, suspend and scrap convert events in the main event loop, none of which come through THINK. The {$R+-} is to disable/enable range checking to use the string as an array.

{3}

procedure debugBanner (msg: Str255);
  const
    numTicks = 1 * 60; { seconds * ticks/sec }
    kResWIND128 = 128; { WIND resource }
  var
    discard: LongInt;
    banner: WindowPtr;
    oldPort: GrafPtr;
    lineWidth: Integer;
  begin
    GetPort(oldPort);
    banner := GetNewWindow(kResWIND128, nil, 
                           Pointer(-1));
    if banner <> nil then
      begin
        ShowWindow(banner);
        { make the window visible }
        SetPort(banner);
        PenNormal;
        ClipRect(banner^.portRect);
{$R-}
        lineWidth := TextWidth(QDPtr(@msg[1]), 
                          0, Integer(msg[0]));
{$R+}
        with banner^.portRect do
          MoveTo(((right - left) - lineWidth) 
                div 2, (bottom - top) div 2);
{$R-}
        DrawText(QDPtr(@msg[1]), 0, 
                 Integer(msg[0]));
{$R+}
        Delay(numTicks, discard);
        { wait a while }
        DisposeWindow(banner);
        { get rid of window }
      end;
    SetPort(oldPort);
  end; { debugBanner }

Finally, for those who aren’t sure how to test for WNE, I include the following:

{4}

function hasWaitNextEvent: Boolean;
{ determines if hardware has WNE trap }
  const
    kVersRequested = 2;    { as of 6.0.1 }
    kWaitNextEventTrap = $A860;
    { trap address for WaitNextEvent }

{ system error constants that are missing }
{ from THINK interface }
    envBadVers = -5501;
    envVersTooBig = -5502;

  type
    pInteger = ^Integer;

  var
    result: OSErr;
    theRec: SysEnvRec;
    theRecPtr: ^SysEnvRec;

  function GetTrapType (theTrap: Integer)
                       :TrapType;
    const
      kOSTrapMask = $0F00; 
{ OS traps start with A0, Tool with A8 or AA.}
    begin
      if BAND(theTrap, $0F00) = 0 then
        GetTrapType := OSTrap
      else
        GetTrapType := ToolTrap;
    end; {GetTrapType}

  function TrapExists (theTrap: Integer)
                      : Boolean;
    const
      kUnimplementedTrap = $A89F;
      { unimplemented trap value }
    begin
      TrapExists := GetTrapAddress(kUnimplementedTrap)
         <> NGetTrapAddress(
      theTrap,GetTrapType(theTrap)
      );
    end; {TrapExists}

  begin
    hasWaitNextEvent := False;
    theRecPtr := @theRec;
    result := SysEnvirons(kVersRequested, 
                          theRecPtr^);
    with theRec do
      case result of
        envNotPresent: 
          debugBanner(’64k ROMS’);
        envBadVers: 
          debugBanner(‘negative version number 
                       passed SysEnvirons’);
        envVersTooBig, noErr: 
          begin 
   { good environs call, fill related fields }
            if machineType > envMac then
              hasWaitNextEvent := 
               TrapExists(kWaitNextEventTrap);
          end;
      end; { case }
  end; { hasWaitNextEvent }

The above routines are incorporated in a small application which calls MultiFinderTest and then displays whether finder is running or not:

{5}

program test;
  var
    multiFinderIsRunning: Boolean;

begin
  multiFinderIsRunning := multiFinderTest;
  if multiFinderIsRunning then
    debugBanner(‘multiFinder running’)
  else
    debugBanner(‘multiFinder not running’);

end. { test }

That about sums it up. Let me know if this doesn’t work in any other environments.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

DesktopLyrics 2.6.6 - Displays current i...
DesktopLyrics is an application that displays the lyrics of the song currently playing in "iTunes" right on your desktop. The lyrics for the song have to be set in iTunes; DesktopLyrics does nothing... Read more
Ember 1.8.3 - Versatile digital scrapboo...
Ember (formerly LittleSnapper) is your digital scrapbook of things that inspire you: websites, photos, apps or other things. Just drag in images that you want to keep, organize them into relevant... Read more
Apple iTunes 12.1 - Manage your music, m...
Apple iTunes lets you organize and play digital music and video on your computer. It can automatically download new music, app, and book purchases across all your devices and computers. And it's a... Read more
LibreOffice 4.4.3 - Free, open-source of...
LibreOffice is an office suite (word processor, spreadsheet, presentations, drawing tool) compatible with other major office suites. The Document Foundation is coordinating development and... Read more
FoldersSynchronizer 4.2.1 - Synchronize...
FoldersSynchronizer is a popular and useful utility that synchronizes and backs-up files, folders, disks and boot disks. On each session you can apply special options like Timers, Multiple Folders,... Read more
Simon 4.0.2 - Monitor changes and crashe...
Simon monitors websites and alerts you of crashes and changes. Select pages to monitor, choose your alert options, and customize your settings. Simon does the rest. Keep a watchful eye on your... Read more
Cocktail 8.1.2 - General maintenance and...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
Cyberduck 4.6.4 - FTP and SFTP browser....
Cyberduck is a robust FTP/FTP-TLS/SFTP browser for the Mac whose lack of visual clutter and cleverly intuitive features make it easy to use. Support for external editors and system technologies such... Read more
Herald 5.0.2 - Notification plugin for M...
Note: Versions 2.1.3 (for OS X 10.7), 3.0.6 (for OS X 10.8), and 4.0.8 (for OS X 10.9) are no longer supported by the developer. Herald is a notification plugin for Mail.app, Apple's Mac OS X email... Read more
DEVONthink Pro 2.8.3 - Knowledge base, i...
Save 10% with our exclusive coupon code: MACUPDATE10 DEVONthink Pro is your essential assistant for today's world, where almost everything is digital. From shopping receipts to important research... Read more

Playworld Superheroes Review
Playworld Superheroes Review By Tre Lawrence on January 30th, 2015 Our Rating: :: HERO CRAFTINGUniversal App - Designed for iPhone and iPad It’s all about the imagination, fighting bad creatures — and looking good while doing so.   | Read more »
Join the SpongeBob Bubble Party in this...
Join the SpongeBob Bubble Party in this New Match 3 Bubble Poppin’ Frenzy Posted by Jessica Fisher on January 30th, 2015 [ permalink ] | Read more »
Handpick Review
Handpick Review By Jennifer Allen on January 30th, 2015 Our Rating: :: TANTALIZING SUGGESTIONSiPhone App - Designed for the iPhone, compatible with the iPad Handpick will make you hungry, as well as inspire you to cook something... | Read more »
Storm the Halls of Echo Base in First St...
Storm the Halls of Echo Base in First Star Wars: Galactic Defense Event Posted by Jessica Fisher on January 30th, 2015 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Contradiction Review
Contradiction Review By Tre Lawrence on January 30th, 2015 Our Rating: :: SPOT THE LIEiPad Only App - Designed for the iPad Contradiction is a live action point and click adventure that’s pretty engaging.   Developer: Tim Follin... | Read more »
Unlock Sunshine Girl in Ironkill with th...
Unlock Sunshine Girl in Ironkill with this special 148Apps code Posted by Rob Rich on January 29th, 2015 [ permalink ] Robo-fighter Ironkill has been out on iOS a | Read more »
Crossroad Zombies Review
Crossroad Zombies Review By Jordan Minor on January 29th, 2015 Our Rating: :: CROSSWALKING DEADiPad Only App - Designed for the iPad Crossroad Zombies is a rough draft of a cool genre mash-up.   | Read more »
Blood Brothers 2 – Tips, Cheats, and Str...
War is hell: Is it the kind of hell you want to check out? Read our Blood Brothers 2 review to find out! Blood Brothers 2, DeNA’s follow-up to the original Blood Brothers, is an intriguing card collecting / role-playing / strategy hybrid. There’s... | Read more »
Blood Brothers 2 Review
Blood Brothers 2 Review By Nadia Oxford on January 29th, 2015 Our Rating: :: AN AGGRAVATING RELATIVEUniversal App - Designed for iPhone and iPad Blood Brothers 2 is built on a simple, solid foundation, but its free-to-play system... | Read more »
I AM BREAD, the Toast of the Town, is Ro...
Have you ever dreamt of being deliciously gluten-y? Do you feel passionate about Rye and Wheat? The guys at Bossa Studios do and that is why they are bringing I AM BREAD to iOS soon. The loafy app will feature all the new content that is being... | Read more »

Price Scanner via MacPrices.net

Intel Aims to Transform Workplace With 5th-Ge...
Intel Corporation today announced the availability of its 5th generation Intel Core vPro processor family that provides cutting-edge features to enable a new and rapidly shifting workplace. To meet... Read more
iOS App Sharalike Introduces New Instant Smar...
Sharalike slideshow and photo management software for iOS, is making it easier than ever to create shareable meaningful moments with its new instant SmartShow technology. Staying organized is a goal... Read more
Apple Becomes World’s Largest Smartphone Vend...
According to the latest research data from Strategy Analytics, as global smartphone shipments grew 31 percent annually to reach a record 380 million units in the fourth quarter of 2014. Apple became... Read more
Cut the Cord: OtterBox Resurgence Power Case...
Dead batteries and broken phones are two of the biggest issues for smartphone users today. Otterbox addresses both with the new Resurgence Power Case for Apple iPhone 6, promising to make those panic... Read more
13-inch Retina MacBook Pros on sale for up to...
B&H Photo has 13″ Retina MacBook Pros on sale for $200 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 2.6GHz/128GB Retina MacBook Pro: $1199.99 save $100 - 13″ 2.6GHz/... Read more
15-inch 2.5GHz Retina MacBook Pro on sale for...
 B&H Photo has the 15″ 2.5GHz Retina MacBook Pro on sale for $2319.99 including free shipping plus NY sales tax only. Their price is $180 off MSRP, and it’s the lowest price available for this... Read more
Back in stock: Refurbished iPod nanos for $99...
The Apple Store has Apple Certified Refurbished 16GB iPod nanos available for $99 including free shipping and Apple’s standard one-year warranty. That’s $50 off the cost of new nanos. Most colors are... Read more
Apple lowers price on refurbished 256GB MacBo...
The Apple Store has lowered prices on Apple Certified Refurbished 2014 MacBook Airs with 256GB SSDs, now available for up to $200 off the cost of new models. An Apple one-year warranty is included... Read more
New Good Management Suite Simplifies Enterpri...
Good Technology has announced the availability of the Good Management Suite, a comprehensive cross-platform solution for organizations getting started with mobile business initiatives. Built on the... Read more
15-inch 2.0GHz Retina MacBook Pro (refurbishe...
The Apple Store has Apple Certified Refurbished previous-generation 15″ 2.0GHz Retina MacBook Pros available for $1489 including free shipping plus Apple’s standard one-year warranty. Their price is... Read more

Jobs Board

*Apple* Solutions Consultant- Retail Sales (...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
Event Director, *Apple* Retail Marketing -...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global engagement strategy and team. Delivering an overarching brand Read more
At-Home Chat Specialist- *Apple* Online Stor...
**Job Summary** At Apple , we believe in hard work, a fun environment, and the kind of creativity and innovation that only comes about when talented people from diverse Read more
SW QA Engineer - *Apple* TV - Apple (United...
**Job Summary** The Apple TV team is looking for experienced Quality Assurance Engineers with a passion for delivering first in class home entertainment solutions. **Key Read more
*Apple* Retail - Multiple Positions(US) - Ap...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you re also the Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.