TweetFollow Us on Twitter

XCMD Printer
Volume Number:4
Issue Number:10
Column Tag:HyperChat®

XCMD Cookbook

By Donald Koscheka, Apple Computer

Print Manager Access

Printing may not come to mind as an area where writing an XCMD might be useful since HyperCard prints card reports. Perhaps you don’t like the reports that HyperCard prints out, or you want to set your own margins or draw borders around each field that’s printed out. XCMDs provide access to the ToolBox Print Manager, empowering you with the capability of performing custom printing in HyperCard. The Print Manager, then, becomes a good candidate for XCMD exploration.

Reporter.P

This month’s XCMD, Reporter.P ( see Listing 1) is a simple text printer that you can adapt to your own needs or use as a template for further exploring Macintosh Printing. As always, we start with the XCMDBlockPtr as the interface to Hypercard. We pass a handle to the text in the first parameter. We could use the other parameters to pass formatting information. Parameter 2, for example, might be set to tell us to draw a border around the page. Parameter 3 might contain the margins in page coordinates.

The algorithm we use goes like this: Move to the top of the page and initialize a rectangle, lineRect, whose height is the height of the text to be printed and whose width is zero. Step through the text to be printed accumulating words (text separated by “white space” or punctuation). If the width of this word plus the width of linerect is less than the page width, add this line to the current line; otherwise, move down to the next line and add the current word to the start of the next line. If any part of the next line is below the bottom margin of the page, eject the page and reset lineRect’s top to the top of the page.

Scoping

One of the nice features of writing XCMDs in Pascal is the scoping feature of procedures and functions. Pascal allows us to define procedures and functions within the main procedure, in this case, the procedure “Reporter”. This is useful because it allows the callbacks and the nested procedures to share reporter’s local variables. When we invoke a callback, we don’t need to pass the parameterBlocPointer. The callbacks can “see” this pointer as if it was a global data declaration. Another nice feature of writing XCMDs in Pascal is that we don’t have to be fussy about the entry point. The variable scoping simplifies the compiler’s job of resolving the entry point. In “C”, subroutines follow the main body of the XCMD so that the compiler can use the start of the main body as the entry point.

Step Through

Reporter first checks the parameter block pointer to determine whether enough parameters were passed. Params[1] should be a handle to some text to print. If the handle is NIL, we don’t have anything to print; otherwise, we open the printer driver, allocate a printer record handle (prRecHandle) and fill the record with the print defaults. If you wanted to allow the user to change the page style (e.g. page orientation), this is where you would invoke the printer’s style dialog. We’ll skip this step for now because we want the XCMD to print the document with a minimum amount of intervention from the user.

Next, we put up the job dialog which is the standard printing dialog that comes up when you select print from the menu. If PRJobDialog returns true, the user clicked the “OK” button and wants us to print the document.

PROpenDoc associates our printing with a grafport. This technique effectively hides the gritty details of printing from the application. As long as we draw to the grafPort returned by PROpenDoc, the underlying code will convert our QuickDraw commands to Postscript for the LaserWriter and to a ribbon-eating bitmap for the Imagewriter.

Once the grafport is opened, we open the first page of the document with the PROpenPage and call PrintHandle to print the text. PrintHandle manages the opening, closing and ejecting of successive pages so when it returns all we need to do is close down the printing port with the PrCloseDoc call. Understanding this routine will take you a long way to understanding the how this printing business works.

Once we’re done printing, we check to see if the document needs to be spooled out. Spooled files are saved to disk and printed by the call to PrPicFile. This statement insures compatibility with print spoolers that will be looking for picture files to print.

The actual printing is performed by the procedure PrintHandle. For the sake of argument, we set the font to nine point Geneva. A better approach would be to pass font information as a parameter to the XCMD. GetFontInfo tells us the height of the text since that will also be the height of a line on the page. We then calculate some rectangles and set the coordinates of our lineRect variable. Note that lineRect starts off at the top left of the page and has an initial width of 0. LineRect will expand to include the width of each word that we add to the line.

Locking down the text handle allows us to maintain pointers to the text. The first pointer, cpos, points to the current position in the text while wpos is used to point to the first character in the current word. A third pointer, tpos, is used as a “test pointer” and will remember the end of the current word.

The repeat loop in printhandle points tpos to the start of the next word (or the first character in the text if we’re just starting the loop). If tpos is currently pointing to a line termination character (e.g. carriage return), we print the current line, move to the next line and reset wpos to point to the next word. Form feeds are handled in a similar fashion except that we eject the current page before continuing.

If tpos points to the nilChar (the ASCII character whose value is 0), we’ve printed all of the text in the input stream so we print the line, eject the page and exit the loop.

The otherwise clause checks to see if the next word in the input will fit on the current line. If so, add the word to the line and update the pointers accordingly. Since tpos points to the end of the current word, setting wpos equal to tpos causes us to “leap” over that word.

If the word doesn’t fit on the line, we first print out the line and then move to the next line. After a word is “accumulated” into a line, we add the width of the word to the linerect.

The last routine of note, CalcNextWord, checks to see if the next character in the text is a word break character such as a space or punctuation. If so, we now have another word to add to the output line.

Summary

Reporter left justifies the text but you can easily add full justification. When you get to the end of the current line (i.e. wordsize + linerect > page width) calculate the number of pixels that would be needed to “fill” out the line. Subtract the current line’s width (right-left) from the page width. If the current line is 2000 pixels wide and the page rectangle is 2500 pixels, then the number of pixels needed to fill out the line is 500. Divide this number into the number of spaces on the line and call SpaceExtra to space out the text.

You’ll be surprised out how easy text formatting is with the Macintosh toolbox and I encourage you to use Reporter as a starting point for your explorations.

{********************************}
{* File: Reporter.p*}
{* *}
{* Prints the entire *}
{* contents of the container*}
{* *}
{* ------------------------ *}
{* In:  params[1] = handle  *}
{* to the text to be printed*}
{* *}
{* ------------------------ *}
{* © 1988, Donald Koscheka, *}
{* All Rights Reserved    *}
{* ------------------------ *}
{********************************}

(****************************
 BUILD SEQUENCE

pascal Reporter.p
link -m ENTRYPOINT -rt 
XCMD=6555 -sn Main=Reporter 
Reporter.p.o 
“{Libraries}”Interface.o 
“{PLibraries}”Paslib.o 
-o “{xcmds}”testxcmds

*****************************)

{$S Reporter }

UNIT Donald_Koscheka; 

{----INTERFACE----}

INTERFACE

USES
 MemTypes, QuickDraw, OSIntf,
 ToolIntf, PackIntf, HyperXCmd,
 PrintTraps;


PROCEDURE EntryPoint(pPtr:XCmdPtr);

{----IMPLEMENTATION----}

IMPLEMENTATION

{$R-}   
CONST
 CARD   = TRUE;
 BKGND  = FALSE;
 NILCHAR= $00;
 CR= $0D; 
 TAB    = $09;
 SPACE  = $20;
 FF= $0C; 
 LINEFEED = $0A; 
 QUOTE  = $22; 
 COMMA  = $2C; 
 PERIOD = $2E;
 PAREN  = $28;
 
TYPE
 Str31 = String[31]; 

PROCEDURE Reporter(pPtr:XCmdPtr);FORWARD;

{----EntryPoint----}

PROCEDURE EntryPoint(pPtr: XCmdPtr);
BEGIN
 Reporter(pPtr);
END;


{----Reporter----}

Function CalcNextWord(VAR wPtr:Ptr):INTEGER;
(**********************
* Given a pointer to a 
* word, calculate the 
* length of the next word
* in the run.  The length
* is determined by adding
* the width  of each character
* together until a word
* break is hit.
*
* The difference between 
* tpos and wpos is always
* one word (including the 
* sticky characters)
*
* IN: Pointer to text 
*wPtr == pointer to NEXT word in
*run (or NIL if No next word)
*
* OUT:  Width of the next 
* word in the line
***********************)
VAR
 done : BOOLEAN;
 wLen : INTEGER;
BEGIN
 done := FALSE;
 wLen := 0;
 
WHILE NOT done DO
BEGIN CASE wPtr^ OF

CR,FF,LINEFEED,NILCHAR:
 done := TRUE;
TAB:
 BEGIN
 WLen:=wLen+CharWidth( chr(SPACE) );
 done := TRUE;
 END;
 
 SPACE, QUOTE, COMMA, PERIOD: 
 BEGIN
 wlen:=wLen+CharWidth( chr(wPtr^));
 done := TRUE;
 wPtr:=Pointer( ORD(wPtr) +1);
 END;
 
OTHERWISE
 BEGIN
 WLen:=wLen+CharWidth( chr(wPtr^));
 wPtr := Pointer( ORD(wPtr) + 1 );
 END;
END; {*** CASE wPtr^ OF ***}
END; {*** WHILE NOT done ***}
 
IF wPtr^ = 0 THEN wPtr := NIL;
 
 CalcNextWord := wLen;
END;


Procedure PrintHandle( hand : Handle; printer : TPPrPort; Prec : THPrint 
);
(**********************
* Print the data passed 
* as a handle and 
* using the given printer
* port.
*
* Prints the data into 
* the current port and
* handles word wrap and
* page breaks.
*
**********************)
VAR 
 done   : BOOLEAN;
 lineHite,
 wordSize : INTEGER;
 pageHite, 
 pageWidth: INTEGER;
 num    : INTEGER;
 cPos   : Ptr; 
 wPos   : Ptr;
 tPos   : Ptr;
 lineRect : Rect;
 fontInfo : FontInfo;
 
PROCEDURE EjectPage;
(****************************
* Eject the current page and 
* adjust the rectangle 
* accordingly
*
****************************)
BEGIN
 PrClosePage( printer );
 PrOpenPage( printer, NIL );
 
{*** Opening a new page yields***}
{*** a new grafport, reset it ***}
 TextFont( GENEVA );
 TextSize( 9 );
 GetFontInfo( FontInfo );
 lineHite := fontInfo.ascent +
 fontInfo.descent +
 fontInfo.leading;

WITH Prec^^.prInfo.rpage DO
BEGIN
lineRect.Top   := top;
lineRect.Bottom:=lineRect.top +lineHite;
lineRect.Right := lineRect.left;
Moveto(lineRect.left,
lineRect.bottom );
END;
tpos := Pointer( ORD( tpos ) +  1 );
END;


PROCEDURE NewLine;
(******************************
* Move to a new position on the
* page.
******************************)
BEGIN
 WITH lineRect DO
 BEGIN
 top  := top + lineHite;
 bottom := bottom + lineHite;
 MoveTo( left, bottom );
 
 IF bottom > pageHite THEN 
 EjectPage;
 
 Right := Prec^^.prInfo.rpage.left;
 END;
END;

PROCEDURE DrawLine;
(******************************
* Draw the current line please
******************************)
BEGIN
 DrawText( cPos, 0, num );
 lineRect.Right := lineRect.left + wordSize;
 tpos := Pointer( ORD( tpos ) + 1 ); { debug }
 num := INTEGER( ORD(tPos) - ORD(wPos) );
 cPos := wPos;
 wPos := tPos;
END;

 
{---- Reporter ----}
BEGIN
 TextFont( GENEVA );
 TextSize( 9 );
 GetFontInfo( FontInfo );
 lineHite := fontInfo.ascent + 
 fontInfo.descent + 
 fontInfo.leading;

{*** get information about page ***}
 WITH Prec^^.prInfo.rpage DO
 BEGIN
 pageHite := bottom - top;
 pageWidth  := right-left;
 lineRect.top  := top;
 lineRect.bottom:= top + lineHite;
 lineRect.left   := left;
 lineRect.right  := left;
 MoveTo( lineRect.left, lineRect.bottom );
 END;

 Hlock( hand );
 cPos := hand^;
 wPos := cPos;
 num  := 0;
 done := false;
 
 REPEAT
 tPos := wPos;
 
 CASE tPos^ OF
 LINEFEED, CR:
 BEGIN
 DrawLine;
 NewLine;
 wpos := tpos;
 END;
 
 FF:
 BEGIN
 EjectPage;
 wpos := tpos;
 lineRect.right := lineRect.right + wordSize;
 END;
 
 NILCHAR:
 BEGIN
 DrawLine;
 done := TRUE;
 END;
 
 OTHERWISE
 BEGIN
 wordSize := CalcNextWord( tPos );
 IF( wordSize + lineRect.right ) < pageWidth THEN
 BEGIN
 num := num + INTEGER( ORD(tPos) - ORD(wPos) );
 wPos := tPos;
 END
 ELSE
 BEGIN
 DrawLine;
 NewLine;
 END;
 lineRect.right:=lineRect.right + wordSize;
 END;
 
 END {** CASE ***};
 UNTIL done;
 
 PRClosePage( printer );
 HUnlock( hand );
END;



PROCEDURE Reporter(pPtr: XCmdPtr);
(*********************
* Print the data that’s 
* passed in as a 
* parameter.
**********************)
VAR
 fieldPtr : Ptr;
 fieldName: Str255;
 fieldType: BOOLEAN;
 fieldData: Handle;
 prRecHandle: THPrint;
 prPort : TPPrPort;
 myStRec: TPrStatus;
 
{$I XCmdGlue.inc }

BEGIN
WITH pPtr^ DO
IF (paramCount <> 0) AND
(params[1] <> NIL) THEN 
BEGIN
 
PROpen;
prRecHandle := THPrint(NewHandle( SIZEOF(TPRINT) ));
PrintDefault( prRecHandle );
 
IF PRJobDialog( prRecHandle ) THEN BEGIN
prPort := PROpenDoc( prRecHandle, NIL, NIL );
PrOpenPage( prPort, NIL );
 
PrintHandle( params[1], prPort, prRecHandle );
 
PrCloseDoc( prPort );
 
 IF(prRecHandle^^.prJob.bJDocLoop = bSpoolLoop) AND (PrError = noErr) 
THEN
 PRPicFile( prRecHandle, NIL, NIL, NIL, myStRec );

END; {*** IF PRJobDialog ***}
 
 DisposHandle(Handle(prRecHandle) );
 PrClose;
 
END; {*** paramCount <> 0 ***}
pPtr^.returnValue := NIL;
END; {*** PROCEDURE Reporter ***}

END.

Listing 1. Reporter.P - A text printing XCMD.

end HyperChat
 
AAPL
$101.20
Apple Inc.
+0.34
MSFT
$46.51
Microsoft Corpora
-0.25
GOOG
$581.32
Google Inc.
+1.37

MacTech Search:
Community Search:

Software Updates via MacUpdate

Apple Digital Camera RAW Compatibility 5...
Apple Digital Camera RAW Compatibility update adds RAW image compatibility to Aperture 3 and iPhoto '11. For more information on supported RAW formats, see here.Version 5.07: Adds RAW camera... Read more
Transmit 4.4.7 - Excellent FTP/SFTP clie...
Transmit is an excellent FTP (file transfer protocol), SFTP, S3 (Amazon.com file hosting) and iDisk/WebDAV client that allows you to upload, download, and delete files over the internet. With the... Read more
Macgo Blu-ray Player 2.10.8.1715 - Blu-r...
Macgo Mac Blu-ray Player can bring you the most unforgettable Blu-ray experience on your Mac. Overview Macgo Mac Blu-ray Player can satisfy just about every need you could possibly have in a Blu-ray... Read more
Capture One Pro 8.0.0.433 - 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
Adobe Acrobat Pro 11.0.09 - Powerful PDF...
Adobe Acrobat allows users to communicate and collaborate more effectively and securely. Unify a wide range of content in a single organized PDF Portfolio. Collaborate through electronic document... Read more
Adobe Reader 11.0.09 - View PDF document...
Adobe Reader allows users to view PDF documents. You may not know what a PDF file is, but you've probably come across one at some point. PDF files are used by companies and even the IRS to... Read more
iFFmpeg 4.6.1 - Convert multimedia files...
iFFmpeg is a graphical front-end for FFmpeg, a command-line tool used to convert multimedia files between formats. The command line instructions can be very hard to master/understand, so iFFmpeg does... Read more
NTFS 11.3.62 - Provides full read and wr...
Paragon NTFS breaks down the barriers between Windows and OS X. Paragon NTFS effectively solves the communication problems between the Mac system and NTFS, providing full read and write access to... Read more
OS X Yosemite 10.10 DP8 - Developer Prev...
Note: This is a Developer Preview. You must be a registered Apple Mac Developer to download this update. You can also sign up for the free OS X Beta Program to download and preview public beta... Read more
FotoMagico 4.5 - Powerful slideshow crea...
FotoMagico lets you create professional slideshows from your photos and music with just a few, simple mouse clicks. It sports a very clean and intuitive yet powerful user interface. High image... Read more

Latest Forum Discussions

See All

Readdle Adds Tons of iOS 8 Updates for A...
Readdle Adds Tons of iOS 8 Updates for All Readdle Apps Posted by Jessica Fisher on September 17th, 2014 [ permalink ] With the iOS 8 dropping today, Readdle has dramatically | Read more »
Let it Rainbow Review
Let it Rainbow Review By Jennifer Allen on September 17th, 2014 Our Rating: :: SIMPLE COLORSiPhone App - Designed for the iPhone, compatible with the iPad A little too simple for extended sessions, Let It Rainbow is still a cute... | Read more »
Goat Simulator (Games)
Goat Simulator 1.0.1 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.1 (iTunes) Description: Goat Simulator is the latest in goat simulation technology, bringing next-gen goat simulation to YOU. You no longer have to... | Read more »
Almightree: The Last Dreamer Review
Almightree: The Last Dreamer Review By Blake Grundman on September 17th, 2014 Our Rating: :: CLIMBING HIGHERUniversal App - Designed for iPhone and iPad Can this Zelda-inspired platformer reach new heights of success?   | Read more »
Zynga Unveils First Look at Looney Tunes...
Zynga Unveils First Look at Looney Tunes Dash! Posted by Ellis Spice on September 16th, 2014 [ permalink ] Be vewy, vewy qwiet. I’m hunting wunners featuwing wabbits, and luckily, it’s duck season wunner season. | Read more »
Guardians on the Go – How to Connect to...
At this point I’m relatively certain most of the country is familiar with Destiny. And for those looking to augment their game a bit, Bungie has changed their Bungie Mobile Companion App to Destiny Companion. | Read more »
Kunin Review
Kunin Review By Jordan Minor on September 16th, 2014 Our Rating: :: SHURIKEN DO ITUniversal App - Designed for iPhone and iPad Kunin is a nervous test of ninja reflexes.   Developer: Dodreams Price: FREE Version Reviewed: 1.0.1... | Read more »
A Major ‘Space Wolves’ Content Expansion...
A Major ‘Space Wolves’ Content Expansion is Now Available for Warhammer 40,000: Carnage Posted by Jessica Fisher on September 16th, 2014 [ permalink ] | Read more »
4 KEMCO Titles are Just $0.99 for a Limi...
4 KEMCO Titles are Just $0.99 for a Limited Time Posted by Jessica Fisher on September 16th, 2014 [ permalink ] KEMCO RPGs Destiny Fantasia, Infinite Dunamis, Bonds of the Sk | Read more »
Introducing Flash, the Latest Wearable F...
Introducing Flash, the Latest Wearable Fitness Monitor from Misfit Posted by Jessica Fisher on September 16th, 2014 [ permalink ] The Misfit Flash is the newly-released fitness and sleep monitor from | Read more »

Price Scanner via MacPrices.net

Roundup of Apple refurbished iPad Airs and iP...
Apple is offering Certified Refurbished iPad Airs for up to $140 off MSRP. Apple’s one-year warranty is included with each model, and shipping is free. Stock tends to come and go with some of these... Read more
Sprint offers 16GB iPad mini for $199.99 with...
Sprint is offering 1st generation 16GB iPad minis for $199.99 with a 2-year service agreement. Standard MSRP for this iPad is $429. Their price is the lowest available for this model. Read more
2.5GHz Mac mini remains on sale for $549, sav...
B&H Photo has the 2.5GHz Mac mini on sale for $549.99 including free shipping. That’s $50 off MSRP, and B&H will also include a free copy of Parallels Desktop software. NY sales tax only. Read more
Apple refurbished iMacs available for up to $...
The Apple Store has Apple Certified Refurbished iMacs available for up to $300 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free. These are the best prices on... Read more
13″ 2.5GHz MacBook Pro offered for $100 off M...
B&H Photo has the 13″ 2.5GHz MacBook Pro on sale for $999.99 including free shipping plus NY sales tax only. Their price is $100 off MSRP. Read more
Free GIMP Professional Grade Graphics App Ver...
The latest 2.8.14 version of the oddly-named GIMP (acronym for: GNU Image Manipulation Program) open source, high-end image editing and creation alternative to Adobe’s Photoshop and refuge from... Read more
Apple Announces Record Pre-orders for iPhone...
Apple has released metrics showing a record number of first day pre-orders of iPhone 6 and iPhone 6 Plus, with over four million sold in the first 24 hours. Demand for the new iPhones exceeds the... Read more
10% off iPhone 6 and 6 Plus Otterbox cases
Get 10% off on popular Otterbox iPhone 6 and iPhone 6 Plus cases at MacMall through September 19th. Use code OTTERBOX10 to see the discount. Read more
15-inch MacBook Pros on sale for up to $125 o...
Amazon has the new 2014 15″ Retina MacBook Pros on sale for up to $125 off MSRP including free shipping: - 15″ 2.2GHz Retina MacBook Pro: $1899.99 save $100 - 15″ 2.5GHz Retina MacBook Pro: $2374... Read more
27-inch 3.2GHz iMac on sale for $1698, $101 o...
Abt has the 27″ 3.2GHz iMac on sale for $1698 including free shipping. Their price is $101 off MSRP. 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
*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
*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
*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
*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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.