TweetFollow Us on Twitter

Jasik ResError
Volume Number:11
Issue Number:2
Column Tag:The Inquisitive Programmer

A Quick Trip Into the Depths

ResError Considered Harmful?

by Steve Jasik, Menlo Park, CA, macnosy@netcom.com

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

Nosy is over 10 years old, having been introduced to the world in Nov ’84 and first shipped in Jan ’85. It has been a few years since I have written an article for MacTech. Since ’84, the Mac has become more powerful than the mainframes I used to work on, and the system has advanced in utility and complexity. Nosy hasn’t changed too much, and some pseudo alternatives to it, such as the ResEdit CODE Editor have come along, but I used it recently to get the global view of a piece of the ROM.

The particular example I’ll show here came to me as a bug in my debugger that showed up on a IIfx running System 7.5. After some investigation, it turned out that the problem was some less-than-robust code in Sound Manager 3.0. The crux of the problem was that, despite what Inside Macintosh or today’s equivalent of it says, the Resource Manager doesn’t always return a non-zero value of ResErr when it doesn’t find a requested resource. More on this later.

The original problem presented to me was that a user was trying to debug an INIT and my debugger was barfing. To find the bug, I set up my normal debugger bug-finding environment, in which I run two copies of my Debugger.

The first one debugs the second one, and if both fail, I have Macsbug running “behind” the first one. For the curious, the magic behind having one debugger debug a second copy of itself is to do a complete context switch of low memory, which includes the exception vectors (0-$FF) and the Macintosh globals ($100-$1E00) when entering The Debugger.

Using this method, I found that someone was trying to do a _CloseResFile on me. It took a few hours to trace it back into the Sound Manager.

At this point let me mention a trick I have used over the years to get a better grip on where one is in a random blowup. One of the most important pieces of information is the stack crawl. It answers the question of how and sometimes why the program is where it is. Many times the stack crawl is less than informative, and those who use Macsbug know well that the ROM part of it can be useless. Given this, how can we recover any information about how the program got to the point it is currently at? The basic answer is to try and repair the current address/bus error by fixing up a register or so (e.g. by putting $0 or $40801000 into the register which has a bus error value that the current instruction is attempting to read from or write to), advancing the Program Counter, and then carefully single stepping our way out of the current procedure and ‘up the stack’ so we can get an idea of where we came from.

In this case, this method worked for me, and I found myself in Sound Manager code, so the next problem was to get a decent disassembly of it so I could figure out why it was trying to do a CloseResFile.

After some disassembly work in Nosy, I found myself staring at the following two procedures, one which I have named open_Snd_Prefs :

open_Snd_Prefs

   B1B10: 4E56 FFB4      'NV..'           LINK    A6,#-$4C
   B1B14: 48E7 0308      'H...'           MOVEM.L D6-D7/A4,-(A7)
   B1B18: 598F           'Y.'             SUBQ.L  #4,A7
   B1B1A: 2F3C 5354 5220 '/<STR '         PUSH.L  #'STR '
   B1B20: 3F3C BF48      '?<.H'           PUSH    #$BF48
   B1B24: A9A0           '..'             _GetResource 
 ; (theType:ResType; ID:INTEGER):Handle 
   B1B26: 285F           '(_'             POP.L   A4
   B1B28: 200C           ' .'             MOVE.L  A4,D0
   B1B2A: 660A           10B1B36          BNE.S   mnn_1
   B1B2C: 558F           'U.'             SUBQ.L  #2,A7
   B1B2E: A9AF           '..'             _ResError ; :OSErr 
   B1B30: 3E1F           '>.'             POP     D7     
; ROM returns ResErr = 0 !! *****
   B1B32: 6000 0094      10B1BC8          BRA     mnn_4 
no error from RsrcMgr, so we exit with D0 = 0, but we haven't opened 
the Prefs file!!!! 
 
   B1B36: 558F           'U.'    mnn_1    SUBQ.L  #2,A7
   B1B38: 3F3C 8000      '?<..'           PUSH    #$8000
   B1B3C: 2F3C 7072 6566 '/<pref'         PUSH.L  #'pref'
   B1B42: 7001           'p.'             MOVEQ   #1,D0
   B1B44: 1F00           '..'             PUSH.B  D0
   B1B46: 486E FFFE      200FFFE          PEA     wnn_4(A6)
   B1B4A: 486E FFFA      200FFFA          PEA     wnn_3(A6)
   B1B4E: 7000           'p.'             MOVEQ   #0,D0
   B1B50: A823           '.#'             _AliasMgr 
; (D0/selector:INTEGER) 
   B1B52: 3E1F           '>.'             POP     D7
   B1B54: 6672           10B1BC8          BNE.S   mnn_4
   B1B56: 204C           ' L'             MOVEA.L A4,A0
   B1B58: A029           '.)'             _HLock  ; (A0/h:Handle) 
   B1B5A: 558F           'U.'             SUBQ.L  #2,A7
   B1B5C: 3F2E FFFE      200FFFE          PUSH    wnn_4(A6)
   B1B60: 2F2E FFFA      200FFFA          PUSH.L  wnn_3(A6)
   B1B64: 2F14           '/.'             PUSH.L  (A4)
   B1B66: 486E FFB4      200FFB4          PEA     wnn_2(A6)
   B1B6A: 303C 0001      '0<..'           MOVE    #1,D0
   B1B6E: AA52           '.R'             _HighLvlFSDisptch 
;(D0/selector:INTEGER) 
   B1B70: 3E1F           '>.'             POP     D7
   B1B72: 0C47 FFD5      '.G..'           CMPI    #-43,D7
   B1B76: 6622           10B1B9A          BNE.S   mnn_2
   B1B78: 4A2E 000B      200000B          TST.B   param2(A6)
   B1B7C: 671C           10B1B9A          BEQ.S   mnn_2
   B1B7E: 486E FFB4      200FFB4          PEA     wnn_2(A6)
   B1B82: 2F3C 7361 6420 '/<sad '         PUSH.L  #'sad '
   B1B88: 2F3C 7072 6566 '/<pref'         PUSH.L  #'pref'
   B1B8E: 70FF           'p.'             MOVEQ   #-1,D0
   B1B90: 3F00           '?.'             PUSH    D0
   B1B92: 303C 000E      '0<..'           MOVE    #14,D0
   B1B96: AA52           '.R'             _HighLvlFSDisptch
   B1B98: 4247           'BG'             CLR     D7
   B1B9A: 4A47           'JG'    mnn_2    TST     D7
   B1B9C: 662A           10B1BC8          BNE.S   mnn_4
   B1B9E: 558F           'U.'             SUBQ.L  #2,A7
   B1BA0: 486E FFB4      200FFB4          PEA     wnn_2(A6)
   B1BA4: 7003           'p.'             MOVEQ   #3,D0
   B1BA6: 1F00           '..'             PUSH.B  D0
   B1BA8: 303C 000D      '0<..'           MOVE    #13,D0
   B1BAC: AA52           '.R'             _HighLvlFSDisptch
   B1BAE: 3C1F           '<.'             POP     D6
   B1BB0: 0C46 FFFF      '.F..'           CMPI    #-1,D6
   B1BB4: 6608           10B1BBE          BNE.S   mnn_3
   B1BB6: 558F           'U.'             SUBQ.L  #2,A7
   B1BB8: A9AF           '..'             _ResError ; :OSErr 
   B1BBA: 3E1F           '>.'             POP     D7
   B1BBC: 600A           10B1BC8          BRA.S   mnn_4
   B1BBE: 206E 000C      200000C mnn_3    MOVEA.L param1(A6),A0
   B1BC2: 3086           '0.'             MOVE    D6,(A0)
   B1BC4: 7000           'p.'             MOVEQ   #0,D0
   B1BC6: 6002           10B1BCA          BRA.S   mnn_5 
   B1BC8: 3007           '0.'    mnn_4    MOVE    D7,D0
   B1BCA: 4CEE 10C0 FFA8 200FFA8 mnn_5    
MOVEM.L wnn_1(A6),D6-D7/A4
   B1BD0: 4E5E           'N^'             UNLK    A6
   B1BD2: 4E75           'Nu'             RTS       
  
 
 
   B1CA6: 4E56 FFFE      'NV..'  proc4742 LINK    A6,#-2
   B1CAA: 48E7 0738      'H..8'           
MOVEM.L D5-D7/A2-A4,-(A7)
   B1CAE: 246E 000C      200000C     MOVEA.L param2(A6),A2
   B1CB2: 266E 0008      2000008     MOVEA.L param3(A6),A3
   B1CB6: 7000           'p.'             MOVEQ   #0,D0
   B1CB8: 1012           '..'             MOVE.B  (A2),D0
   B1CBA: 4A80           'J.'             TST.L   D0
   B1CBC: 6604           10B1CC2          BNE.S   mnq_1
   B1CBE: 7ECE           '~.'             MOVEQ   #-50,D7
   B1CC0: 6074           10B1D36          BRA.S   mnq_6
   B1CC2: 200B           ' .'    mnq_1    MOVE.L  A3,D0
   B1CC4: 6604           10B1CCA          BNE.S   mnq_2
   B1CC6: 7ECE           '~.'             MOVEQ   #-50,D7
   B1CC8: 606C           10B1D36          BRA.S   mnq_6
         
   B1CCA: 558F           'U.'    mnq_2    SUBQ.L  #2,A7
   B1CCC: A994           '..'             _CurResFile ; :RefNum 
   B1CCE: 3C1F           '<.'             POP     D6
   B1CD0: 486E FFFE      200FFFE          PEA     wnq_2(A6)
   B1CD4: 7000           'p.'             MOVEQ   #0,D0
   B1CD6: 2F00           '/.'             PUSH.L  D0
   B1CD8: 4EBA FE36      10B1B10          JSR  open_Snd_Prefs
   B1CDC: 3E00           '>.'             MOVE    D0,D7
   B1CDE: 504F           'PO'             ADDQ    #8,A7
   B1CE0: 670A           10B1CEC          BEQ.S   mnq_3
; if no error then get 'sysb' resource 
   B1CE2: 3F06           '?.'             PUSH    D6
   B1CE4: A998           '..'             _UseResFile 
; (frefNum:RefNum) 
   B1CE6: 3D47 0014      2000014          MOVE D7,funRslt(A6)
   B1CEA: 604E           10B1D3A          BRA.S   mnq_7 
 
   B1CEC: 598F           'Y.'    mnq_3    SUBQ.L  #4,A7
   B1CEE: 2F2E 0010      2000010          PUSH.L  param1(A6)
   B1CF2: 2F0A           '/.'             PUSH.L  A2
   B1CF4: A820           '. '             _Get1NamedResource
 ; (theType:ResType; name:Str255):Handle 
   B1CF6: 285F           '(_'             POP.L   A4
   B1CF8: 558F           'U.'             SUBQ.L  #2,A7
   B1CFA: A9AF           '..'             _ResError ; :OSErr 
   B1CFC: 3E1F           '>.'             POP     D7
   B1CFE: 200C           ' .'             MOVE.L  A4,D0
   B1D00: 660A           10B1D0C          BNE.S   mnq_4    
; oops, didn't get it, close the res file
   B1D02: 4A47           'JG'             TST     D7
   B1D04: 6626           10B1D2C          BNE.S   mnq_5
   B1D06: 3E3C FF40      '><.@'           MOVE    #$FF40,D7
   B1D0A: 6020           10B1D2C          BRA.S   mnq_5
 
   B1D0C: 204C           ' L'    mnq_4    MOVEA.L A4,A0
   B1D0E: A025           '.%'             _GetHandleSize 
;(A0/h:Handle):D0\Size 
   B1D10: 2A00           '*.'             MOVE.L  D0,D5
   B1D12: 3E38 0220         $220          MOVE    MemErr,D7
   B1D16: 6614           10B1D2C          BNE.S   mnq_5
   B1D18: 204B           ' K'             MOVEA.L A3,A0
   B1D1A: 2005           ' .'             MOVE.L  D5,D0
   B1D1C: A024           '.$'             _SetHandleSize 
;(A0/h:Handle; D0/newSize:Size) 
   B1D1E: 3E38 0220         $220          MOVE    MemErr,D7
   B1D22: 6608           10B1D2C          BNE.S   mnq_5
   B1D24: 2054           ' T'             MOVEA.L (A4),A0
   B1D26: 2253           '"S'             MOVEA.L (A3),A1
   B1D28: 2005           ' .'             MOVE.L  D5,D0
   B1D2A: A22E           '..'             _BlockMove   
;(A0/srcPtr,A1/destPtr:Ptr;
   B1D2C: 3F2E FFFE      200FFFE mnq_5    PUSH    wnq_2(A6)
   B1D30: A99A           '..'             _CloseResFile 
; (refNum:RefNum) 
   B1D32: 3F06           '?.'             PUSH    D6
   B1D34: A998           '..'             _UseResFile 
; (frefNum:RefNum) 
 
   B1D36: 3D47 0014      2000014 mnq_6    MOVE D7,funRslt(A6)
 
   B1D3A: 4CEE 1CE0 FFE6 200FFE6 mnq_7    
MOVEM.L q_1(A6),D5-D7/A2-A4
   B1D40: 4E5E           'N^'             UNLK    A6
   B1D42: 205F           ' _'             POP.L   A0
   B1D44: 4FEF 000C      'O...'           LEA     12(A7),A7
   B1D48: 4ED0           'N.'             JMP     (A0)
  

Referring to the procedure I named open_Snd_Prefs, it sets up a Link frame and calls _GetResource to get the value of a 'STR ' resource with id = BF48. I rummaged around the System file in Resorcerer and found that this string had the value of “Sound Prefs”. The code then checks to see that it gets the string, and the rest of the procedure uses the Alias Mgr, etc to attempt to find its prefs file somewhere in the system folder. Apparently this procedure exits with 0 if it has found and opened the prefs file or a non-zero return when it has not. The caller futzes around to get the value of some magic resource from it and then closes the prefs file via _CloseResFile. So how, you may ask, could anything go wrong with this simple code?

Well, my debugger disconnects itself from the System file. That is, inside my Debugger, the System file is not on the chain of resource files to be searched, and, in almost all cases, it contains copies of the necessary resources that would normally come from the System file. The reason for this is that an open resource file contains a field for each resource that points to the copy of it in memory when the resource is opened. In order to avoid having to switch the values of these fields when transitioning between The Debugger and user, I chose the time efficient method of duplicating the necessary resources inside my debugger.

With this fact in hand, lets look at open_Snd_Prefs again. In C the source code would look like:

OSErr open_Snd_Prefs() {
  handle h = GetResource('STR ',$BF48); // get name of Sound Prefs file
  if( ! h ) 
    return( ResError ); // assumes the Resource Mgr returns a non-zero error
  {
          // locate and Open sound prefs file, ...

          return( 0 )
  } 
}

As I mentioned at the beginning, the resource manager may return a NIL handle, but it rarely returns a non-zero value of ResError.

The upshot of all this is that the caller got a 0 error return and thought that the sound prefs file was open. When it did the Get1NamedResource, and it failed, it then tried to close the current resource file, which in this case was my Debugger, and things went to hell from there.

In retrospect, a more robust way to specify and code the routine might be to have it return the (FCB) refNum of the sound prefs file that it opened or 0. Then the logic in the calling proc would be somewhat cleaner and less subject to failure.

Rewriting, the revised code would be:

int open_Snd_Prefs() {
  int refNum = 0;
  handle h = GetResource('STR ',$BF48); // get name of Sound Prefs file
  if( h ) 
  {
      // use Alias Mgr, etc to locate and open Sound Prefs resource file
      refNum = ??    // some value returned by HighLvlFSDisptch 
  }
  return( refNum ) }

As a last thought, I suspect that the buggy version of the code has been distributed by DTS as sample code for you to use, and in my humble opinion, it leaves something to be desired. Not because it is intrinsically wrong, but because the Macintosh Resource Manager is inconsistent about returning a non-zero value of ResError.

Some Things That You Can Try At Home:

1) Search your code for ResError calls and convince yourself that they serve some purpose, or that you won’t do anything really stupid if it returns 0 when it should not.

2) If you are using a class library such as MacApp, Metrowerks PowerPlant or TCL, then search it for ResError calls.

3) Selectively remove resources from your product and see what kind of stupid things it does.

4) Selectively remove resources from some one else’s product and see what kind of stupid things it does. Submit bug reports.

An alternative title for this article could have been “ResError Considered Harmful”. During the language wars of the 60’s and 70’s, I believe that Dijkstra threw the first stone by writing an article in SIGPlan, the ACM’s Special Interest Group of Programming Languages titled “Goto Considered Harmful”. His thesis was that the use of the goto statement made for poor programming style, etc. Over the next few years, the wars escalated to the point where I suspect that someone wrote an article titled “Harmful Considered Harmful”.

[We welcome your comments, feedback, and debugging tales of woe and intrigue at editorial@xplain.com - Ed stb]

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

BBEdit 11.6.1 - Powerful text and HTML e...
BBEdit is the leading professional HTML and text editor for the Mac. Specifically crafted in response to the needs of Web authors and software developers, this award-winning product provides a... Read more
OmniGraffle Pro 6.6.1 - Create diagrams,...
OmniGraffle Pro helps you draw beautiful diagrams, family trees, flow charts, org charts, layouts, and (mathematically speaking) any other directed or non-directed graphs. We've had people use... Read more
OmniGraffle 6.6.1 - Create diagrams, flo...
OmniGraffle helps you draw beautiful diagrams, family trees, flow charts, org charts, layouts, and (mathematically speaking) any other directed or non-directed graphs. We've had people use Graffle to... Read more
Dropbox 8.4.21 - Cloud backup and synchr...
Dropbox is an application that creates a special Finder folder that automatically syncs online and between your computers. It allows you to both backup files and keep them up-to-date between systems... Read more
BetterTouchTool 1.84 - Customize Multi-T...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more
ScreenFlow 6.1 - Create screen recording...
ScreenFlow is powerful, easy-to-use screencasting software for the Mac. With ScreenFlow you can record the contents of your entire monitor while also capturing your video camera, microphone and your... Read more
f.lux 37.7 - Adjusts the color of your d...
f.lux makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day. Ever notice how people texting at night have that eerie blue glow? Or wake... Read more
BetterTouchTool 1.84 - Customize Multi-T...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more
Dropbox 8.4.21 - Cloud backup and synchr...
Dropbox is an application that creates a special Finder folder that automatically syncs online and between your computers. It allows you to both backup files and keep them up-to-date between systems... Read more
OmniGraffle Pro 6.6.1 - Create diagrams,...
OmniGraffle Pro helps you draw beautiful diagrams, family trees, flow charts, org charts, layouts, and (mathematically speaking) any other directed or non-directed graphs. We've had people use... Read more

3 best fantasy football apps to get you...
Last season didn't go the way you wanted it to in fantasy football. You were super happy following your drafts or auctions, convinced you had outsmarted everyone. You were all set to hustle on the waiver wire, work out some sweet trades, and make... | Read more »
Pokemon GO update: Take me to your leade...
The Team Leaders in Pokemon GO have had it pretty easy up until now. They show up when players reach level 5, make their cases for joining their respective teams, and that's pretty much it. Light work, as Floyd Mayweather might say. [Read more] | Read more »
Ruismaker FM (Music)
Ruismaker FM 1.0 Device: iOS Universal Category: Music Price: $4.99, Version: 1.0 (iTunes) Description: Following up on the success of Ruismaker, here's her crazy twin-sister, designed for people who want to design their own... | Read more »
Space Marshals 2 (Games)
Space Marshals 2 1.0.15 Device: iOS iPhone Category: Games Price: $5.99, Version: 1.0.15 (iTunes) Description: The sci-fi wild west adventure in outer space continues with Space Marshals 2. This tactical top-down shooter puts you in... | Read more »
Dungeon Warfare (Games)
Dungeon Warfare 1.0 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0 (iTunes) Description: Dungeon Warfare is a challenging tower defense game where you become a dungeon lord to defend your dungeon against greedy... | Read more »
Solitairica (Games)
Solitairica 1.0.7 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.7 (iTunes) Description: Solitairica takes RPG combat and challenging rogue-like progression to a fresh new place—the world of solitaire! | Read more »
Bowmasters tips, tricks and hints
At least for this writer, archery was one of the more pleasant surprises of the 2016 Rio Olympics. As opposed to target shooting with guns, which was dreadfully boring, watching people shoot arrows at targets was pretty darn cool. [Read more] | Read more »
Best apps for watching live TV
The Olympics have come and gone, leaving nearly everyone in a temporary state of "What the heck am I going to watch on TV right now?" Besides old reruns of Golden Girls, but that goes without saying. [Read more] | Read more »
What is Flip Diving, and why has it take...
Move over Pokemon GO. There's a new king in town, and it's "the world's #1 cliff diving game." [Read more] | Read more »
5 places where Pokemon GO is still numbe...
In the U.S., the bloom is off the Pokemon Go rose ever so slightly. It's still doing great, sitting atop the top grossing chart as it has for some time, but it's no longer among the top 10 free apps in downloads, possibly because darn near... | Read more »

Price Scanner via MacPrices.net

Apple refurbished 13-inch MacBook Airs availa...
Apple has Certified Refurbished 2016 and 2015 13″ MacBook Airs now available starting at $849. An Apple one-year warranty is included with each MacBook, and shipping is free: - 2016 13″ 1.6GHz/8GB/... Read more
Apple refurbished iPad mini 2s available for...
Apple is offering Certified Refurbished iPad mini 2s for up to $80 off the cost of new minis. An Apple one-year warranty is included with each model, and shipping is free: - 16GB iPad mini 2 WiFi: $... Read more
Save up to $600 with Apple refurbished Mac Pr...
Apple has Certified Refurbished Mac Pros available 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 following... Read more
Mac Pros on sale for $200 off MSRP
B&H Photo has Mac Pros on sale for $200 off MSRP. Shipping is free, and B&H charges sales tax in NY only: - 3.7GHz 4-core Mac Pro: $2799, $200 off MSRP - 3.5GHz 6-core Mac Pro: $3799, $200... Read more
Will We See A 10.5″ iPad Pro in 2017? – The ‘...
A MacRumors report, cites a research note from KGI Securities analyst Ming-Chi Kuo, saying a new size iPad model is in the works. According to the highly respected Cho, who has a strong track record... Read more
IOGEAR USB-C Docking Station Transforms Lapto...
IOGEAR has announced the launch of its innovative USB-C Docking Station with Power Delivery which turns USB-C enabled laptops into desktop workstations. The new IOGEAR USB-C Docking Station features... Read more
12-inch Retina MacBooks on sale for up to $10...
Amazon has 2016 12″ Apple Retina MacBooks on sale for $100 off MSRP. Shipping is free: - 12″ 1.1GHz Space Gray Retina MacBook: $1199 $100 off MSRP - 12″ 1.1GHz Silver Retina MacBook: $1224.99 $75 off... Read more
13-inch 2.5GHz MacBook Pro (Apple refurbished...
Apple has 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″ 2.5GHz MacBook Pros... Read more
21-inch iMacs on sale for up to $120 off MSRP
B&H Photo has 21″ iMacs on sale for up to $120 off MSRP including free shipping plus NY sales tax only: - 21″ 3.1GHz iMac 4K: $1379 $120 off MSRP - 21″ 2.8GHz iMac: $1199.99 $100 off MSRP - 21″ 1... Read more
Typinator 6.10 comes with 50 improvements – G...
Ergonis Software today announced release of Typinator 6.10, a new version of their text expander utility for macOS. Typinator 6.10 comes with 50 improvements, including new features, compatibility... Read more

Jobs Board

*Apple* Mobile Master - Best Buy (United Sta...
What does a Best Buy Apple Mobile Master do? At Best Buy, our mission is to leverage the unique talents and passions of our employees to inspire, delight, and enrich Read more
*Apple* Retail - Multiple Positions Akron, O...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Simply Mac *Apple* Specialist- Repair Techn...
…The Technician is a master at working with our customers to diagnose and repair Apple devices in a manner that exceeds the expectations set forth by Apple Read more
*Apple* Retail - Multiple Positions Germanto...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Professional Learning Specialist - A...
# Apple Professional Learning Specialist Job Number: 51234379 Portland, Maine, Maine, United States Posted: Aug. 18, 2016 Weekly Hours: 40.00 **Job Summary** The Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.