TweetFollow Us on Twitter

Custom Input Dialog
Volume Number:1
Issue Number:8
Column Tag:Pascal Procedures

"Custom Dialog Box for Input"

By Alan Wootton, President, Top-Notch Productions, MacTutor Contributing Editor

Our Project for this month is to create a pair of input statements for MacPascal. In Basic, there is a command that prompts the user for a number or a string. It would be nice to have this for MacPascal, but would be even better if it could be implemented using the excellent MacIntosh user interface. Towards this end, we will be using the Dialog Manager, Package 7, and Resources.

Resources

Previous generations of computers provided only files as storage entities. Any small or large chunk of numbers to be accessed by the operating system usually required a file to hold it. If a program needed a large number of small data areas the result was usually a large number of files. This happened all too often.

The Mac is different. On the Mac a file name actually represents two files. One of these is the usual type of file, the other is full of tiny subfiles. A whole new world! Naturally, there is a sort of directory to go with these subfiles.

Inside Mac calls the two files "forks" of a file. The subfiles are "resources" and the directory is the "resource map". In a normal file system all files are referred to by name and possibly a version number. Resources are referred to by a four character name called the "TYPE" (actually any longint) and an integer known as the "ID number". Many of the ROM routines access a particular TYPE with the ID being variable. For instance, a menu can be created by providing a number and the Menu Manager will access the resource with TYPE='MENU' and the ID provided.

File access can be quite a programming hassle, so you are probably imagining that resource access is even worse. Not true. There is no way to read in only part of a resource, so the subtleties of file i/o can be ignored. You provide a name and the resource manager will open the file for you. When you provide a TYPE and an ID the resource manager will search the maps that are open, read the data in, if necessary, and return a handle to that data. There are some fine points concerning control over when the data is read in, when it is to be purged from memory, which heap it goes on, and others. For our purposes it is enough to just open the file.

Resource Tools

Every computer has some sort of software to manipulate and view the files, so what does one use for resources? There are four tools from Apple to work with resources.

The simplest is RMover. RMover will simply list the resources in a file. You may also cut and paste resources between files. RMover will recognize some types as probably having a certain form of data and display it appropriately. Examples are STR (a string), PICT (a picture), ICON (an icon). In each case the data is simply so many bytes, but it is assumed that a particular type is used exclusively for a single brand of data (which is not a law). Every Mac freak should rummage through the files on his disks with RMover to get a feel for what is there (check out MacPascal!).

For programming, the next most useful tool is RMaker. This is a sort of compiler for resources. It knows the form of the data for windows, menus, dialog boxs, and more. Make a text file with coded descriptions in it, run RMaker and a new file is created with the described resources in it. RMaker is supplied with the MDS assembler from Apple and with some compilers (note: MDS is now shipping and includes a copy of Inside Macintosh). Get a copy of RMaker as soon as possible (there is a 10 page document you'll also need).

Recently, two editors of resources have become available. These are "Resource Editor" and "Redit". Both will edit resource data, often in a friendly format. For instance, the Resource Editor will allow you to edit an icon fatbits style and not as 128 bytes.

If you bought Inside MacIntosh and the software supplement these tools were sent to you. If not, there are still some places to get them. MacTutor Utility disk #1 has resource tools (see inside front cover for ordering).

The Dialog Manager

Now we will get back to the problem at hand: how to make a box that asks for input. What we ultimately need is a window (which has a grafport) and some controls. We also will need to use the text editor to edit the input data. If it weren't for the Dialog Manager this would be real work. Fortunately, the Dialog Manager will perform all of these chores for us. I won't go too deeply into this because that is what IM is for, but all you have to do is give the dialog manager an id to a resource of type DLOG and, assuming that the data is in the correct form, everything is automatic.

Classy_Input.R

The first step in our project is to create a file with three resources in it. Type Classy_Input.r (below) into a text file and apply RMaker to it. After that, use RMover to look and see if the resources exist in the file as planned. If you don't have RMaker you might try making the file with Resource Editor. If there is a lot of trouble creating this file, (it's important) write to me care of MacTutor and I will do a resource creation project. Actually, we should use RMaker input files as the official resource specification and exchange method.

Classy_Input.Pas

Next, boot MacPascal and type in Classy_Input.pas (below). This is a very simple program. First we open our resource file. The dialog box is created by GetNewDialog, operated by ModalDialog, and erased by DisposDialog. Simple! Of course, I've gotten fancy and used GetDItem and SetIText to change the text of some items. It is also necessary to use a GetDItem-GetIText combination to get the text from the edittext item. With these same simple routines it is possible to do much more elaborate dialogs. As a matter of fact, you can completely change the appearance of this example by merely changing the resource specification. Note that this is the same method used by real Mac applications and is not just a kludge for educational purposes.

You may omit Prompt_For_Number at first if you wish. After you have Prompt_for_String working you may wish to try for numbers. The prompt for strings looks like that shown at the top of the next column.

Fig. 1 Program Sample

To use this same box to prompt for numbers we will use Package #7. To access a package you use it's inline trap and leave a selector on the stack: eg. inlineP(TRAP,selector). However, Pack#7 is register based so it is necessary to use the register based interface that I presented in MacTutor No.6.

GetNewDialog accesses resource DLOG 12345 and DITL 12345 in order to determine the characteristics of the box it will make. Pack#7 loads resource PACK 7 (in the file "System"), locks it on the heap and then calls it as a procedure (we will call our own procedures the same way in later articles). By far the simplest of the resource-using toolbox routines is GetString:

 
procedure GetString(ID:integer):Handle;
begin 
 GetString:=GetResource('STR ',ID);
end
 

This also one of the simplest traps of any kind. All text of any kind should be in resources for later translation. This is the reason we use GetString, and also the reason we use GetNewDialog and not NewDialog. You should take up the habit of using resources this way,too.

Classy_Input.R
;;     *********************************************
;;     **                                                            
                      **
;;    **    Resource data for Classy_Input         **
;;    **                                                             
                      **
;;    **    Process this TEXT file through           **
;;    **    RMaker:the Resource Compiler        **
;;    **     by Andy Hertzfeld.                                    **
;;    **                                                             
                     **
;;    *********************************************
;;     double semicolons start comments
;;
MacTutor_disk:Classy_Input.rsrc;;
????????               
;; destination volume:filename 
;; type and creator of file = ???? ????

;;        ****************************************
;;        **  The first resource is the                  **
;;        **  definition of a Dialog Manager    **
;;        **  window.                                                
   **
;;       ****************************************
;;  global coordinates !!

type DLOG
box,12345
;;  note we have no title
96 128 148 384          ;; top left bottom right 
visible goaway
1                                          ;; window type = dBoxProc 

0                                          ;; refcon
12345                             ;; ID of DITL associated
                                            ;; with this DLOG

;;       ****************************************
;;       **      Next is a list of 'items' to go       **
;;       **       in the window.                                 **
;;       ****************************************

type DITL                            ;; see Dialog Manager
items,12345
4                                               ;; four items 

Button
4 120 24 180                    ;;  local coordinates !!
OK;;

Button
4 188 24 248
Cancel;;

EditText Disabled  
32 8 48 248        
;;;;;;;;;;;;;;;;;;text added later 

StaticText Disabled  
4 8 20 120           
Type a String         ;; prompt text, modified later

;;      disabled means that the Dialog Manager
;;      will not report events in this control
;;
;;          *********************************************
;;          **     And finally, the prompt used by        **
;;          **    Prompt_For_Number                              **
;;          *********************************************

type STR 
prompt,12345
Type a number

;;         ****************************************
;;         **  end of file                                           
     **
;;         ****************************************


Classy_Input.pas
program Classy_Input_test;{ by Alan Wootton 5/85 }
 type
  Ptr = ^integer;
  Handle = ^Ptr;
  StrPtr = ^str255;

 var{ for test, not a part of final logic }
  rid : integer;
  number : longint;
  words : str255;

 function Prompt_for_Str (prompt, sample : str255) :
                                          str255;
  var
   DlogPtr : Ptr;
   itype, itemHit : integer;
   r : rect;
   itemH : Handle;
   tempStr : str255;

{ This uses DLOG ID=12345 and associated DITL with }
{ the same ID.  Items are: #1=OK , #2=Cancel, }
{ #3=result, #4=prompt.  First we will _GetDitem to }
{ obtain handle and then _SetIText. For item#3= result }
{ string, and item#4 = prompt string. This will leave }
{ itemH referring to result item. }
 begin
  DlogPtr:= pointer(LinlineF($A97C,12345,nil,pointer(-1))); 
{ _GetNewDialog }

  inlineP($A98D, DlogPtr, 4, @itype, @itemH, @r);
{ _GetDitem }
  if prompt <> '' then
   inlineP($A98F, itemH, @prompt);{ _SetIText }

  inlineP($A98D, DlogPtr, 3, @itype, @itemH, @r);
{ _GetDitem }
  if sample <> '' then
   inlineP($A98F, itemH, @sample);{ _SetIText }

  inlineP($A991, nil, @itemHit);
{ _ModalDialog, returns with 1 or 2 in itemHit }

  if itemHit = 2 then { if Cancel }
   tempStr := ''
  else {  if OK }
   inlineP($A990, itemH, @tempStr);
{ _GetIText  from item#3 }

  inlineP($A983, DlogPtr);{ _DisposDialog }
  Prompt_for_Str := tempStr;
 end;


 function Prompt_for_Number (sampN : longint) :
                                                                     
      longint;
  var
   sHan : ^StrPtr;
   str : str255;
   access : array[0..12] of integer;
   d0, a0 : longint;{ the 68000 registers }
{ What we will do here is convert the input number }
{ into a string and then pass it to Prompt_for_String. }
{ Then we convert the returned string into a number.  }
{ The conversions are done with  $A9EE=pack7 . }
{ See Packages. }
{ Access is a 2 register OS interface that we must }
{ use because the call is register based yet also requires}
{ for the selector (the 1 or 0) to be on the stack  }
{ (and 'Generic' won't do that) }
 begin
  stuffHex(@access, '2848548C41FA000C309F245F265F20522013FFFF224826804ED4');
  a0 := ord(@str);
  d0 := sampN;
  inlineP($4E75, 0, @d0, @a0, $A9EE, @access);
{ pack7,0  is _NumtoString }
{    Str is now the string of  sampN }

  sHan := Pointer(LinlineF($A9BA, 12345));
{ _Getstring, numeric prompt  }
  str := Prompt_for_Str(sHan^^, str);
{ Str is now new string,  convert d0 to num. } 
{ A0 is still @str }

  inlineP($4E75, 1, @d0, @a0, $A9EE, @access);
{ pack7,1  is _StringtoNum }
  Prompt_for_number := d0;
 end;


begin{  main procedure, used only to exercise }
{ procedures above. }

 rid := WinlineF($A997, 'MacTutor_disk:Classy_Input.rsrc');{ _OpenResFile 
}
{ this file is the output of Rmaker, we open it to access }
{ our resources }
 if rid < 0 then
  writeln('error opening file', rid)
 else
  begin
   words := Prompt_for_Str('Type a string', 'sample string');
   writeln(' the words returned are:', words);

   words := Prompt_for_Str('', '');{ no prompts }
   writeln(' the words returned are:', words);

   number := Prompt_for_Number(1234);
   writeln('the number returned is', number);
  end;
 inlineP($A99A, rid);{ _CloseResFile}
end.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Trend Micro 11.0.2062 - An essential sec...
Trend Micro Antivirus provides essential security for macOS with real-time malware detection and mitigation in an affordable solution with a simple, intuitive interface. However, be aware that more... Read more
Backblaze 7.0.2.490 - Online backup serv...
Backblaze is an online backup service designed from the ground-up for the Mac. With unlimited storage available for $6 per month, as well as a free 15-day trial, peace of mind is within reach with... Read more
Pro Video Formats 2.2.1 - Updates for pr...
Pro Video Formats includes support for the following professional video codecs: Apple Intermediate Codec Apple ProRes AVC-Intra 50 / 100 / 200 / 4:4:4 / LT AVC-LongG XAVC XF-AVC DVCPRO HD HDV XDCAM... Read more
Boom 3D 1.3.11 - $19.99
Boom 3D is a revolutionary app with 3D Surround Sound and phenomenally rich and intense audio that is realistic and works on any headphones. Features 3D surround sound Built-in audio player... Read more
Final Cut Pro 10.5.2 - Professional vide...
Redesigned from the ground up, Final Cut Pro combines revolutionary video editing with a powerful media organization and incredible performance to let you create at the speed of thought.... Read more
Chromium 89.0.4389.72 - Fast and stable...
Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web. Version 89.0.4389.72: Complete list of changes can... Read more
iMovie 10.2.3 - Edit personal videos and...
With a streamlined design and intuitive editing features, iMovie lets you create Hollywood-style trailers and beautiful movies like never before. Browse your video library, share favorite moments,... Read more
OmniPlan 4.2.5 - Professional-grade proj...
With OmniPlan, you can create logical, manageable project plans with Gantt charts, schedules, summaries, milestones, and critical paths. Break down the tasks needed to make your project a success,... Read more
Compressor 4.5.2 - Adds power and flexib...
Compressor adds power and flexibility to Final Cut Pro X export. Customize output settings, work faster with distributed encoding, and tap into a comprehensive set of delivery features. Features:... Read more
Motion 5.5.1 - Create and customize Fina...
Motion is designed for video editors, Motion 5 lets you customize Final Cut Pro titles, transitions, and effects. Or create your own dazzling animations in 2D or 3D space, with real-time feedback as... Read more

Latest Forum Discussions

See All

Frogger in Toy Town's latest update...
Konami Digital Entertainment has announced today that their Apple Arcade title Frogger in Toy Town has been updated to introduce a new ranked Endurance Mode. This new game variant's arrival is also accompanied by a few other changes. [Read more] | Read more »
Mitoza is surreal adventure toy you can...
The folks behind the Rusty Lake games have just put a new title onto the App Store. Second Maze, Rusty Lake's collaborative publishing brand, has just brought this 10 year old adventure game from Gal Mamalya to mobile. The best part about all of... | Read more »
Pocket Gamer Awards 2021: You have five...
Three weeks ago our sister site, Pocket Gamer, entered the voting stage for the upcoming Pocket Gamer Awards 2021 and is now in the final stretch. You only have a few hours left to vote for the games you’ve enjoyed on mobile in the past year, as... | Read more »
Patty Stack is a casual arcade game, ava...
Patty Stack is a casual arcade title that's available now for iOS and Android. It's the debut game from developer Feeka Games tasks players with making an increasingly giant burger tower. Think of it as Tower Bloxx but more edible. [Read more] | Read more »
Distract Yourself With These Great Mobil...
There’s a lot going on right now, and I don’t really feel like trying to write some kind of pithy intro for it. All I’ll say is lots of people have been coming together and helping each other in small ways, and I’m choosing to focus on that as I... | Read more »
Genshin Impact Guide - Gacha Strategy: W...
This is part 2 of our Genshin Impact gacha strategy guides. See part 1 here. You can check out more guides for Genshin Impact here. | Read more »
Slashy Camp is a new endless runner insp...
Blue Wizard Digital has released Slashy Camp onto iOS and Android after it spent a short amount of time in early access. [Read more] | Read more »
Kinder World is a relaxing game about lo...
Lumi Interactive is releasing a game called Kinder World later this year on iOS and Android, which is all about looking after houseplants. [Read more] | Read more »
Steam Link Spotlight - Fights in Tight S...
Steam Link Spotlight is a feature where we look at PC games that play exceptionally well using the Steam Link app. Our last entry was on Hades. Read about how it plays using Steam Link over here. | Read more »
Lyxo, the light-based puzzler for mobile...
Vienna-based independent game studio Emoak has just released its unique light-based puzzler for iOS and Android. Founded in 2014 by Tobias Sturn, the company is also the creative force behind the infinite climbing game Paper Climb, as well as the... | Read more »

Price Scanner via MacPrices.net

Weekend Sale: $100 off Apple iPad Magic Keybo...
Amazon has Apple iPad Magic Keyboards on sale for $100 off MSRP for a limited time. Amazon’s prices are the lowest available for iPad Magic Keyboard from any Apple reseller this weekend: – Magic... Read more
Gazelle now offering a full line of refurbish...
Gazelle is now offering a full range of discounted, refurbished, unlocked Apple iPhone 12 models starting at $649. iPhones are offered in Fair, Good, and Excellent conditions, and multiple colors are... Read more
These are the latest discounted iPhones Apple...
Apple has a range of Certified Refurbished iPhones available right now starting at only $339. Apple includes a standard one-year warranty, new outer shell, and shipping is free. According to Apple, “... Read more
Save up to $64 on new M1 MacBook Airs at Expe...
Apple reseller Expercom has 2020 13″ M1 MacBook Airs on sale for $51-$64 off Apple’s MSRP with prices starting at $947.96. In addition to their MacBook Air sale prices, take $50 off AppleCare+ when... Read more
Discounts available on 16″ MacBook Pros with...
Upgrade a 16″ 6-Core or 8-Core MacBook Pro from 16GB of standard RAM to 32GB at Adorama, and save $100-$210 over Apple’s price for this custom option: – 16″ 6-Core MacBook Pro/32GB RAM: $2699, save $... Read more
10.9″ iPad Airs on sale for $50-$70 off Apple...
Amazon has new 2020 10.9″ Apple WiFi iPad Airs in stock and on sale today for up to $70 off MSRP with prices starting at $549. Note that Amazon’s sale price might be restricted to certain colors (see... Read more
Apple restocks 2020 27″ 5K iMacs for up to $3...
After an initial offering in January, Apple has restocked a full line of Certified Refurbished 2020 27″ 5K iMacs starting at $1529 and up to $350 off original MSRP. Apple’s one-year warranty is... Read more
Sale! 16″ 8-Core MacBook Pro for $2449, $350...
Apple reseller Adorama has the 16″ 2.3GHz 8-Core Space Gray MacBook Pro in stock and on sale today for $2449 including free shipping. Their price is $350 off Apple’s MSRP for this model, and it’s the... Read more
Roundup of 13″ Multi-Core Intel MacBook Pro s...
Apple resellers are offering significant sales & deals this week on 2020 13″ MacBook Pros with 10th generation Intel CPUs. Take up to $250 off Apple’s MSRP, get free fast shipping, and/or pay no... Read more
64GB iPhone 8 Plus available for $379 at Appl...
Apple has the 64GB iPhone 8 Plus in Space Gray & Gold colors available for $379 today, Certified Refurbished. Each phone is unlocked and comes with Apple’s standard 1-year warranty and free... Read more

Jobs Board

Geek Squad Advanced Repair *Apple* Professi...
**795178BR** **Job Title:** Geek Squad Advanced Repair Apple Professional **Job Category:** Store Associates **Store Number or Department:** 001406-Allen Park-Store Read more
Geek Squad *Apple* Consultation Professiona...
**796549BR** **Job Title:** Geek Squad Apple Consultation Professional **Job Category:** Store Associates **Store Number or Department:** 001800-Hot Springs-Store Read more
*Apple* Mobility Specialist - Best Buy (Unit...
**796014BR** **Job Title:** Apple Mobility Specialist **Job Category:** Store Associates **Store Number or Department:** 001776-Woodmore Towne Centre-Store **Job Read more
Systems Architect, *Apple* Production Engin...
…package beginning on your first day? If so, we hope you'll keep reading! The Apple Sales Engineering and account team is looking for a stellar presales engineer with Read more
Systems Engineer, Webscale, *Apple* Retail,...
…beginning on your first day? If so, we hope you'll keep reading! The Apple Sales Engineering team is looking for a pre-sales engineer with Enterprise engineering Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.