TweetFollow Us on Twitter

Date FKEY
Volume Number:9
Issue Number:2
Column Tag:Pascal/FKEY

Related Info: Event Manager

A Date-Typing FKEY

A one hour project

By Rob Spencer, East Lyme, Connecticut

This is a one-hour project with two goals: first, to provide a minor but useful tidbit for everyday use, and second, to present a short example of an FKEY that posts and modifies its own events.

For newcomers, an FKEY is a small routine that’s invoked when the user types a command-shift-number sequence, such as the command-shift-3 FKEY that captures the screen to a MacPaint document (under System 6) or Teach Text PICT document (System 7). An FKEY consists of stand-alone code with no global variables and usually little or no user interface; see Roy Lovejoy’s recent article (“FKEYs in THINK Pascal, Easy...”, MacTutor, June 1992, p. 53-55) for more discussion.

This FKEY does something simple and useful for those of us who type letters and memos every day: when the user types command-shift-6 (or whatever number from 0 to 9 you choose), the FKEY types the current date into the current document or edit field. It does this by getting the date from the Toolbox and sending it to the event queue as a sequence of keyDown events. The text appears in your document exactly as if you had typed it.

ASSEMBLE THE EVENT

The heart of the FKEY is the SendAString routine that posts each character of its input string as a keyDown event for the current application to catch. All that’s necessary is to assemble the appropriate message (a longint) for each character.

The low byte of message is charCode, which is just ord(theStr[i]). The next byte is the keyCode, which specifies which key was pressed. For most uses keyCode can be zero, since most keyDown dispatch routines ignore the keyCode and look only at charCode, like this:

with myEvent do begin
 myChar := CHR(BitAnd(message, charCodeMask));
 if BitAnd(modifiers, cmdKey) <> 0 then...

However, my testing with keyCode = 0 showed that some applications didn’t receive the proper string, so to be safe I had to do a little more work to fill in the correct keyCode byte.

Key codes are defined in the System’s KCHR resource, but rather than retrieve and parse that, we use a small bit of it in a fixed look-up table string (called keyMap in the listing). This contains the correct keyCode values for all letters, numbers, and the comma. The space character is handled separately, rather than make keyMap too long. Finally, keyCode is shifted to the second byte and added to charCode to produce the correct message.

REMOVE THOSE MODIFIERS

In the first version of the FKEY I simply used PostEvent and got unexpected results: since the user must have the command and shift keys down to invoke the FKEY, the keyDown events that it posts come with the cmdKey and shiftKey modifier bits set. Thus if the month is September, the first keyDown that the application sees will be command-S, and it will promptly save the current document! What we want is the FKEY to send the keyDowns without any modifiers; the solution is to use PPostEvent and then clear the appropriate bits from the new event, as shown in the listing.

TESTING and DEBUGGING

As both Roy Lovejoy and the THINK Pascal demo FKEY “BlockComment” point out, debugging an FKEY is simple. Just build a tiny program that includes the FKEY unit and then call the obligatory FKEY entry point called main. In my program I then use THINK’s Text window to receive the keyDown events, so we can see what day it is.

USING THE FKEY

Use ResEdit to paste the FKEY resource into the word processing application of your choice, or, if you want the FKEY universally available, paste it into the System file. That’s it!

BUT WAIT, THERE’S MORE!

Though FKEY’s are as old as the Mac, they aren’t widely appreciated. Perhaps this is partly because of what I just wrote above: “Use ResEdit...”. I decided to provide an easier way, though for the sake of brevity I’ll only mention it here: on the code disk for this month is a HyperCard stack which does a one-button installation of the FKEY to your System file.

Figure 1: bonus installation stack

This stack does this job with an original XFCN and XCMD. The XFCN, SystemResources, returns a list of System resources of a given type (to see if the FKEY already exists), while the XCMD, InstallFKEY, does the actual installation. The stack also includes the THINK Pascal source code for these externals.

LISTINGS
unit DateFKEY;
{ Types today’s date when the user types }
{ cmd-shift-6. In THINK Pascal 4.0 by    }  
{ Rob Spencer, August 1992.              }

interface

 procedure main;

implementation

 procedure main;

 { ----------------------------- }

 function SendAString (theStr: str255): OSErr;

 const
 { keyMap is a subset of the }
 { KCHR System resource.     }
 keyMap = 
 'ASDFHGZXCV*BQWERYT123465=97*80*OU*IP*LJ*K**,*NM';
 space = char(32);

 var
 i, keyCode: integer;
 theChar: char;
 theErr: OSErr;
 message, modifiers, modifierMask: longint;
 myQPtr: EvQElPtr;

 begin
 theErr := noErr;
 modifierMask := BitNot(shiftKey + cmdKey);

 if theStr <> '' then
 begin
 FlushEvents(keyDown, 0);
 for i := 1 to length(theStr) do
 begin
 { Get the proper keyCode. }
 theChar := theStr[i];
 if theChar in ['a'..'z'] then
 { Make theChar uppercase for }
 { our look-up string.        }
 theChar := char(ord(theChar) - 32);
 if theChar = space then
 keyCode := $31
 else
 keyCode := pos(theChar, keyMap) - 1;
 if keyCode = -1 then
 keyCode := 0;

 { Assemble the message.   }
 message := BitShift(keyCode, 8) +
 ord(theStr[i]);

 { Post the keyDown event. }
 theErr := PPostEvent(keyDown, message,
 myQPtr);
 if theErr <> noErr then
 leave;

 { Now strip off the cmdKey }
 { and shiftKey modifiers.  }
 modifiers := BitAnd(myQPtr^.evtQModifiers, 
 modifierMask);
 myQPtr^.evtQModifiers := modifiers;
 end;
 end;
 SendAString := theErr;
 end;

 { ============== main ============== }

 var
 dateStr: str255;
 tempLong: longint;

 begin
 { The queue can only hold 20 characters, }
 { so we strip off the day of the week.   }
 GetDateTime(tempLong);
 IUDateString(tempLong, LongDate, dateStr);
 if dateStr <> '' then
 if pos(char(32), dateStr) > 0 then
 Delete(dateStr, 1, pos(char(32), dateStr));
 if SendAString(dateStr) <> noErr then
 SysBeep(10);
 end;

end.

{ ====== shell program for debugging ===== }

program DateFKEYtest;

 uses
 DateFKEY;

 var
 myStr: str255;

begin
 main;  { Call our FKEY }
 { Make an active input window    }
 { to receive the keyDown events. }
 ShowText;
 read(myStr);
 writeLn;
 writeLn(myStr);
end.

{ =========== end of listings =========== }

Figure 2: the project window for debugging

Figure 3: the project window for the stand-alone FKEY

Figure 4: set up for FKEY #6.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Yasu 4.0.0 β - System maintenance app; p...
Yasu was created with System Administrators who service large groups of workstations in mind, Yasu (Yet Another System Utility) was made to do a specific group of maintenance tasks quickly within a... Read more
Skype 7.37.0.178 - Voice-over-internet p...
Skype allows you to talk to friends, family and co-workers across the Internet without the inconvenience of long distance telephone charges. Using peer-to-peer data transmission technology, Skype... Read more
EtreCheck 3.0.5 - For troubleshooting yo...
EtreCheck is an app that displays the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to... Read more
Amadeus Pro 2.3.1 - Multitrack sound rec...
Amadeus Pro lets you use your Mac computer for any audio-related task, such as live audio recording, digitizing tapes and records, converting between a variety of sound formats, etc. Thanks to its... Read more
NeoFinder 6.9.3 - Catalog your external...
NeoFinder (formerly CDFinder) rapidly organizes your data, either on external or internal disks, or any other volumes. It catalogs all your data, so you stay in control of your data archive or disk... Read more
WhatsApp 0.2.1880 - Desktop client for W...
WhatsApp is the desktop client for WhatsApp Messenger, a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for... Read more
Hazel 4.0.6 - Create rules for organizin...
Hazel is your personal housekeeper, organizing and cleaning folders based on rules you define. Hazel can also manage your trash and uninstall your applications. Organize your files using a familiar... Read more
Apple iBooks Author 2.5 - Create and pub...
Apple iBooks Author helps you create and publish amazing Multi-Touch books for iPad. Now anyone can create stunning iBooks textbooks, cookbooks, history books, picture books, and more for iPad. All... Read more
MYStuff Pro 2.0.26 - $39.99
MYStuff Pro is the most flexible way to create detail-rich inventories for your home or small business. Add items to MYStuff by dragging and dropping existing information, uploading new images, or... Read more
MarsEdit 3.7.8 - Quick and convenient bl...
MarsEdit is a blog editor for OS X that makes editing your blog like writing email, with spell-checking, drafts, multiple windows, and even AppleScript support. It works with with most blog services... Read more

How to get past Vulture Island's tr...
Vulture Island is a colorful and quirky mish-mash of platforming and puzzles. It’s creative and fresh, but sometimes the game can throw a curveball at you, leaving you stuck as to how you should progress. These tips will help you explore smoothly... | Read more »
The new Clash of Kings is just for Weste...
If you’ve played the original Clash of Kings, you’ll probably recognise the city building, alliance forging and strategic battles in Clash of Kings: The West. What sets this version apart is that it’s tailor made for a Western audience and the... | Read more »
Frost - Survival card game (Games)
Frost - Survival card game 1.12.1 Device: iOS Universal Category: Games Price: $3.99, Version: 1.12.1 (iTunes) Description: *Warning: the game will work on iPhone 5C and above and iPad Pro / 4. Other devices are not supported* | Read more »
How to build and care for your team in D...
Before you hit the trail and become a dog sledding legend, there’s actually a fair bit of prep work to be done. In Dog Sled Saga, you’re not only racing, you’re also building and caring for a team of furry friends. There’s a lot to consider—... | Read more »
How to win every race in Dog Sled Saga
If I had to guess, I’d say Dog Sled Saga is the most adorable racing game on the App Store right now. It’s a dog sled racing sim full of adorable, loyal puppies. Just look at those fluffy little tails wagging. Behind that cute, pixelated facade is... | Read more »
Let the war games commence in Gunship Ba...
Buzz Lightyear famously said, “This isn’t flying, this is falling – with style!” In the case of Gunship Battle: Second War, though, this really is flying - with style! The flight simulator app from Joycity puts you in control of 20 faithfully... | Read more »
How to get a high score in Fired Up
Fired Up is Noodlecake Games’ high score chasing, firefighting adventure. You take control of a wayward firefighter who propels himself up the side of a highrise with blasts of water. Sound silly? It is. It’s also pretty difficult. You can’t... | Read more »
NBA 2K17 (Games)
NBA 2K17 1.0 Device: iOS iPhone Category: Games Price: $7.99, Version: 1.0 (iTunes) Description: Following the record-breaking launch of NBA 2K16, the NBA 2K franchise continues to stake its claim as the most authentic sports video... | Read more »
Dog Sled Saga (Games)
Dog Sled Saga 1.0.1 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.1 (iTunes) Description: A game by Dan + Lisa As a rookie musher, foster a dogsledding team whose skills will grow if they're treated right. Week by... | Read more »
60 Seconds! Atomic Adventure (Games)
60 Seconds! Atomic Adventure 1.2 Device: iOS Universal Category: Games Price: $2.99, Version: 1.2 (iTunes) Description: 60 Seconds! is a dark comedy atomic adventure of scavenge and survival. Collect supplies and rescue your family... | Read more »

Price Scanner via MacPrices.net

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
13-inch 2.7GHz/256GB Retina MacBook Pro on sa...
Amazon.com has the 13″ 2.7GHz/256GB Retina Apple MacBook Pro on sale for $151 off MSRP including free shipping: - 13″ 2.7GHz/256GB Retina MacBook Pro (sku MF840LL/A): $1348 $151 off MSRP Read more
Apple TVs on sale for up to $50 off MSRP
Best Buy has 32GB and 64GB Apple TVs on sale for $40-$50 off MSRP on their online store. Choose free shipping or free local store pickup (if available). Sale prices for online orders only, in-store... Read more
Apple refurbished 13-inch Retina MacBook Pros...
Apple has Certified Refurbished 13″ Retina MacBook Pros available for up to $270 off the cost of new models. An Apple one-year warranty is included with each model, and shipping is free: - 13″ 2.7GHz... Read more
Duplicate Sweeper Free On Mac App Store For O...
To celebrate the launch of Apple’s latest macOS Sierra, Stafford, United Kingdom based Wide Angle Software has announced that its duplicate file finder software, Duplicate Sweeper, is now available... Read more
13-inch Retina MacBook Pros on sale for up to...
B&H Photo has 13″ Retina Apple MacBook Pros on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY tax only: - 13″ 2.7GHz/128GB Retina MacBook Pro: $1174.99 $125 off MSRP - 13... Read more
Evidence Surfaces Pointing To New A10X Chip F...
Citing a job description for a Project Lead position at Apple’s Austin, Texas engineering labs, Motley Fool’s Ashraf Eassa deduces that development is progressing well on Apple’s next-generation in-... Read more
Check Print’R for macOS Allows Anyone to Easi...
Delaware-based Match Software has announced the release and immediate availability of Check Print’R 3.21, an important update to their easy-to-use check printing application for macOS. Check Print’R... Read more
Apple refurbished 11-inch MacBook Airs availa...
Apple has Certified Refurbished 11″ MacBook Airs (the latest models), available for up to $170 off the cost of new models. An Apple one-year warranty is included with each MacBook, and shipping is... Read more
Apple refurbished 15-inch Retina MacBook Pros...
Apple has Certified Refurbished 2015 15″ Retina MacBook Pros available for up to $380 off the cost of new models. An Apple one-year warranty is included with each model, and shipping is free: - 15″ 2... Read more

Jobs Board

Sr. *Apple* Mac Engineer - Net2Source Inc....
…staffing, training and technology. We have following position open with our client. Sr. Apple Mac Engineer6+ Months CTH Start date : 19th Sept Travelling Job If Read more
*Apple* Retail - Multiple Positions-Norfolk,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Restaurant Manager (Neighborhood Captain) - A...
…in every aspect of daily operation. WHY YOU'LL LIKE IT: You'll be the Big Apple . You'll solve problems. You'll get to show your ability to handle the stress and Read more
Lead *Apple* Solutions Consultant - Apple (...
# Lead Apple Solutions Consultant Job Number: 51829230 Detroit, Michigan, United States Posted: Sep. 19, 2016 Weekly Hours: 40.00 **Job Summary** The Lead ASC is an Read more
US- *Apple* Store Leader Program - Apple (Un...
…Summary Learn and grow as you explore the art of leadership at the Apple Store. You'll master our retail business inside and out through training, hands-on Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.