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.

 
AAPL
$100.58
Apple Inc.
+0.01
MSFT
$45.22
Microsoft Corpora
+0.27
GOOG
$583.37
Google Inc.
-1.12

MacTech Search:
Community Search:

Software Updates via MacUpdate

Pages 5.2.2 - Apple's word processo...
Apple Pages is a powerful word processor that gives you everything you need to create documents that look beautiful. And read beautifully. It lets you work seamlessly between Mac and iOS devices. And... Read more
Quicken 2015 2.0.1 - Complete personal f...
The new Quicken 2015 helps you manage all your personal finances in one place, so you can see where you're spending and where you can save. Quicken automatically categorizes your financial... Read more
CleanMyMac 2.2.7 - Delete files that was...
CleanMyMac makes space for the things you love. Sporting a range of ingenious new features, CleanMyMac 2 lets you safely and intelligently scan and clean your entire system, delete large, unused... Read more
MacFamilyTree 7.2.4 - 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
Videobox 4.1.1 - Download Flash video th...
Videobox allows you to quickly and easily download Flash video from most all of the popular video sites on the internet. Videobox will convert the video into a native Quicktime format so it's ready... Read more
Web Snapper 3.3.5 - Capture entire Web p...
Web Snapper lets you capture Web pages exactly as they appear in your browser. You can send them to a file as images or vector-based, multi-page PDFs. It captures the whole Web page - eliminating... Read more
Picasa 3.9.138 - Organize, edit, and sha...
Picasa and Picasa Web Albums allows you to organize, edit, and upload your photos to the Web from your computer in quick, simple steps. Arrange your photos into folders and albums and erase their... Read more
Tidy Up 3.0.15.0 - Find duplicate files...
Tidy Up is a complete duplicate finder and disk-tidiness utility. With Tidy Up you can search for duplicate files and packages by the owner application, content, type, creator, extension, time... Read more
Parallels Desktop 10.0 - Run Windows app...
Parallels Desktop is simply the world's bestselling, top-rated, and most trusted solution for running Windows applications on your Mac. With Parallels Desktop for Mac, you can seamlessly run both... Read more
Apple Final Cut Pro X 10.1.3 - Professio...
Apple Final Cut Pro X is a professional video editing solution.Completely redesigned from the ground up, Final Cut Pro adds extraordinary speed, quality, and flexibility to every part of the post-... Read more

Latest Forum Discussions

See All

DotEmu Summer Sale Cuts Several Games’ P...
DotEmu Summer Sale Cuts Several Games’ Prices to $0.99 Posted by Ellis Spice on August 21st, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
King Announces its Newest “Saga” – Diamo...
King Announces its Newest “Saga” – Diamond Digger Saga Posted by Jessica Fisher on August 21st, 2014 [ permalink ] Diamond Digger Saga, by King Digital Entertainment, promises to be another addictive, adorable game in the “Saga” | Read more »
Spacetime Studios’ Greg Mueller Tells Al...
| Read more »
TourStar Review
TourStar Review By Rob Thomas on August 21st, 2014 Our Rating: :: BORING TOURINGUniversal App - Designed for iPhone and iPad When The Ramones sang “Touring, touring/It’s never boring,” they clearly weren’t referring to TourStar.... | Read more »
Track Your Pregnancy with Glow Nurture
Track Your Pregnancy with Glow Nurture Posted by Jessica Fisher on August 21st, 2014 [ permalink ] iPhone App - Designed for the iPhone, compatible with the iPad | Read more »
Outcast Odyssey – An Interview with the...
At this year’s San Diego Comic-Con, fans got the chance to meet and mingle with several of the artists behind Magic Pixel Games and Namco Bandai’s upcoming card battler, Outcast Odyssey. Considering many of these artists have worked on comics in the... | Read more »
BoxPop Review
BoxPop Review By Jennifer Allen on August 21st, 2014 Our Rating: :: UNTAXING PUZZLESUniversal App - Designed for iPhone and iPad Move from tile to tile to clear the board in this slightly too simple and easy puzzle game.   | Read more »
Breakdown Buddy Review
Breakdown Buddy Review By Jennifer Allen on August 21st, 2014 Our Rating: :: FLAWED CONCEPTiPhone App - Designed for the iPhone, compatible with the iPad There’s a good idea here, but Breakdown Buddy isn’t as useful as it tries to... | Read more »
jamstik, the Guitar You Can Take Everywh...
jamstik, the Guitar You Can Take Everywhere, is Now Available for Purchase Posted by Jessica Fisher on August 21st, 2014 [ permalink ] Zivix has announced that their guitar-in-your-pocket, | Read more »
Star Walk 2 - Guide to the Sky Day and N...
Star Walk 2 - Guide to the Sky Day and Night 1.0.0 Device: iOS Universal Category: Education Price: $2.99, Version: 1.0.0 (iTunes) Description: The next generation of the best-selling Star Walk, winner of Apple Design Award, used by... | Read more »

Price Scanner via MacPrices.net

21-inch iMacs on sale for up to $150 off MSRP
B&H Photo has 21″ iMacs on sale for up to $150 off MSRP including free shipping plus NY sales tax only. B&H will also include a free copy of Parallels Desktop software: - 21″ 2.7GHz iMac: $... Read more
27-inch 3.2GHz iMac on sale for $1698, save $...
Abt has the 27″ 3.2GHz iMac on sale for $1698 including free shipping. Their price is $101 off MSRP. Read more
Mac Backup Guru 2.0 Drive Backup/Cloneing Uti...
Mac Backup Guru developer MacDaddy has released Mac Backup Guru 2.0, offering new and enhanced advanced features, such as bootable backups, synchronised volumes and folders, and a Snapshot mode that... Read more
Operate GE’s New Free-Standing KItchen Range...
Think you accidentally left the oven on? Switch it off while on the go. The new free-standing Profile™ Series gas and electric ranges are GE’s second cooking appliances, following their wall oven, to... Read more
Parallels Announces Parallels Desktop 10 for...
The no. 1-selling software for running Windows applications on a Mac becomes an even easier choice for millions of consumers and IT professionals worldwide with the launch of the most powerful... Read more
Apple now offering certified refurbished 2014...
 The Apple Store is now offering Apple Certified Refurbished 2014 MacBook Airs for up to $180 off the cost of new models. An Apple one-year warranty is included with each MacBook, and shipping is... Read more
Best Buy’s College Student Deals: $100 off Ma...
Take an additional $100 off all MacBooks and iMacs, $50 off iPad Airs and iPad minis, at Best Buy Online with their College Students Deals Savings, valid through September 6th. Anyone with a valid .... Read more
MacBook Airs on sale for $100 off MSRP, free...
B&H Photo has three 2014 MacBook Airs on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only. They also include free copies of Parallels Desktop and LoJack for Laptops... Read more
Razer Taipan Mouse For Gamers And Non-Gamers...
If you’re a serious gamer on either Mac or Windows PCs, a serious gaming mouse is a necessity for first-tier performance. However, even if like me you’re not much of a gamer, there’s still a strong... Read more
15-inch 2.2GHz MacBook Pro on sale for $1899,...
Adorama has the new 15″ 2.2GHz Retina MacBook Pro on sale for $1899 including free shipping plus NY & NJ sales tax only. Their price is $100 off MSRP, and it’s the lowest price available for this... Read more

Jobs Board

*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
Position Opening at *Apple* - Apple (United...
**Job Summary** As more and more people discover Apple , they visit our stores seeking ways to incorporate our products into their lives. It's your job, as a Store Read more
Position Opening at *Apple* - Apple (United...
…Summary** As a Specialist, you help create the energy and excitement around Apple products, providing the right solutions and getting products into customers' hands. You Read more
Project Manager, *Apple* Financial Services...
**Job Summary** Apple Financial Services (AFS) offers consumers, businesses and educational institutions ways to finance Apple purchases. We work with national and Read more
*Apple* Solutions Consultant (ASC)- Retail S...
**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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.