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

MacFamilyTree 7.3.4 - Create and explore...
MacFamilyTree gives genealogy a facelift: it's modern, interactive, incredibly fast, and easy to use. We're convinced that generations of chroniclers would have loved to trade in their genealogy... Read more
Yummy FTP 1.10.2 - FTP/SFTP/FTPS client...
Yummy FTP is an FTP + SFTP + FTPS file transfer client which focuses on speed, reliability and productivity. Whether you need to transfer a few files or a few thousand, schedule automatic backups, or... Read more
VueScan 9.5.08 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
Iridient Developer 3.0.1 - Powerful imag...
Iridient Developer (was RAW Developer) is a powerful image conversion application designed specifically for OS X. Iridient Developer gives advanced photographers total control over every aspect of... Read more
Air Video Server HD 2.1.0 - Stream video...
Air Video Server HD streams videos instantly from your computer on your iPhone, iPad, iPod touch or Apple TV. No need to worry about converting or transferring files. We took everything that was... Read more
Duplicate Annihilator 5.7.5 - Find and d...
Duplicate Annihilator takes on the time-consuming task of comparing the images in your iPhoto library using effective algorithms to make sure that no duplicate escapes. Duplicate Annihilator... Read more
BusyContacts 1.0.2 - Fast, efficient con...
BusyContacts is a contact manager for OS X that makes creating, finding, and managing contacts faster and more efficient. It brings to contact management the same power, flexibility, and sharing... Read more
Capture One Pro 8.2.0.82 - RAW workflow...
Capture One Pro 8 is a professional RAW converter offering you ultimate image quality with accurate colors and incredible detail from more than 300 high-end cameras -- straight out of the box. It... Read more
Backblaze 4.0.0.872 - Online backup serv...
Backblaze is an online backup service designed from the ground-up for the Mac.With unlimited storage available for $5 per month, as well as a free 15-day trial, peace of mind is within reach with... Read more
Little Snitch 3.5.2 - Alerts you about o...
Little Snitch gives you control over your private outgoing data. Track background activity As soon as your computer connects to the Internet, applications often have permission to send any... Read more

Pie In The Sky: A Pizza Odyssey (Games)
Pie In The Sky: A Pizza Odyssey 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: A game about delivering pizza. In space. | Read more »
Chosen Gives Hopeful Singers, Songwriter...
If YouTube videos and reality TV shows like The Voice have taught us one thing, it’s that there are a lot of people out there who are anxious to show the world their talents. And if they’ve taught us a second thing, it’s that there’s an almost... | Read more »
Android's Popular OfficeSuite Now A...
Once only available for Android devices, OfficeSuite has finally landed on the app store. The Mobile Systems app lets you view, edit, create, and share Word, Excel, and PowerPoint documents as well as convert them to/from PDFs. It's touted as being... | Read more »
Warhammer: Arcane Magic is Coming Soon,...
Turbo Tape Games has announced that they're joining forces with Games Workshop to bring the turn-based strategy board game, Warhammer: Arcane Magic, to life on the iOS. | Read more »
Fast & Furious: Legacy's Creati...
| Read more »
N-Fusion and 505's Ember is Totally...
| Read more »
These are All the Apple Watch Apps and G...
The Apple Watch is less than a month from hitting store shelves, and once you get your hands on it you're probably going to want some apps and games to install. Fear not! We've compiled a list of all the Apple Watch apps and games we've been able to... | Read more »
Appy to Have Known You - Lee Hamlet Look...
Being at 148Apps these past 2 years has been an awesome experience that has taught me a great deal, and working with such a great team has been a privilege. Thank you to Rob Rich, and to both Rob LeFebvre and Jeff Scott before him, for helping me... | Read more »
Hands-On With Allstar Heroes - A Promisi...
Let’s get this out of the way quickly. Allstar Heroes looks a lot like a certain other recent action RPG release, but it turns out that while it’s not yet available here, Allstar Heroes has been around for much longer than that other title. Now that... | Read more »
Macho Man and Steve Austin Join the Rank...
WWE Immortals, by Warner Bros. Interactive Entertainment and WWE, has gotten a superstar update. You'll now have access to Macho Man Randy Savage and Steve Austin. Both characters have two different versions: Macho Man Randy Savage Renegade or Macho... | Read more »

Price Scanner via MacPrices.net

Apple offering refurbished 27-inch 5K iMacs f...
The Apple Store is offering Apple Certified Refurbished 27″ 3.5GHz 5K iMacs for $2119 including free shipping. Their price is $380 off the price of new models, and it’s the lowest price available for... Read more
16GB iPad mini on sale for $199, save $50
Walmart has 16GB iPad minis (1st generation) available for $199.99 on their online store, including free shipping. Their price is $50 off MSRP. Online orders only. Read more
New 128GB MacBook Airs on sale for $50 off MS...
 B&H Photo has 128GB 11″ and 13″ 2015 MacBook Airs on sale today for $50 off MSRP including free shipping plus NY sales tax only: - 11″ 1.6GHz/128GB MacBook Air (Model #MJVM2LL/A): $849 $50 off... Read more
13-inch 2.6GHz Retina MacBook Pro (refurbishe...
The Apple Store has Apple Certified Refurbished 13″ 2.6GHz/128GB Retina MacBook Pros available for $979 including free shipping. Original MSRP for this model was $1299. Read more
Save up to $600 with Apple refurbished Mac Pr...
The Apple Store is offering Apple Certified Refurbished Mac Pros for up to $600 off the cost of new models. An Apple one-year warranty is included with each Mac Pro, and shipping is free. The... Read more
Samsung Galaxy S 6 and Galaxy S 6 edge U.S. P...
Samsung Electronics America, Inc. has announced the Galaxy S 6 and Galaxy S 6 edge will be available in the U.S. beginning April 10, with pre-orders being accepted now. “We have completely reimagined... Read more
13-inch 2.5GHz MacBook Pro (refurbished) avai...
The Apple Store has Apple Certified Refurbished 13″ 2.5GHz MacBook Pros available for $829, or $270 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.... Read more
Save up to $80 on iPad Air 2s, NY tax only, f...
 B&H Photo has iPad Air 2s on sale for $80 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469.99 $30 off - 64GB iPad Air 2 WiFi: $549.99 $50 off - 128GB iPad... Read more
iMacs on sale for up to $205 off MSRP
B&H Photo has 21″ and 27″ iMacs on sale for up to $205 off MSRP including free shipping plus NY sales tax only: - 21″ 1.4GHz iMac: $1019 $80 off - 21″ 2.7GHz iMac: $1189 $110 off - 21″ 2.9GHz... Read more
Färbe Technik Offers iPhone Battery Charge LI...
Färbe Technik, which manufactures and markets of mobile accessories for Apple, Blackberry and Samsung mobile devices, is offering tips on how to keep your iPhone charged while in the field: •... Read more

Jobs Board

DevOps Software Engineer - *Apple* Pay, iOS...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
*Apple* Retail - Multiple Positions (US) - A...
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
Sr. Technical Services Consultant, *Apple*...
**Job Summary** Apple Professional Services (APS) has an opening for a senior technical position that contributes to Apple 's efforts for strategic and transactional Read more
Lead *Apple* Solutions Consultant - Retail...
**Job Summary** Job Summary The Lead ASC is an Apple employee who serves as the Apple business manager and influencer in a hyper-business critical Reseller's store Read more
*Apple* Pay - Site Reliability Engineer - Ap...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.