TweetFollow Us on Twitter

Clipboard 2
Volume Number:1
Issue Number:6
Column Tag:BASIC

The Clipboard

By Dave Kelly

One of the features that makes the Macintosh unique from other computers is the use of the clipboard. The clipboard adds flexibility to the Mac user interface. With it you can exchange data from one application to another. Anyone who has worked with MacPaint or MacWrite is familar with the operation of the clipboard. What you cut or copy is saved in the clipboard allowing you to paste it somewhere else! But how do you deal with the clipboard from your own programs? That is the subject we want to explore this month.

Support of the clipboard is another feature of the Macintosh user interface that was left out of MSBASIC version 1.0 but fortunately is easily used in version 2.0. Most of the features that we will use here will only work for version 2.0. There are a few things you should keep in mind when writing programs to use the clipboard.

First, there are three different ways which BASIC can address the clipboard file. Use the OPEN statement with one of the following statements for the filename:

“CLIP:” for transferring data from programs that have tabular data, like Multiplan or Chart.

“CLIP:TEXT” for transfering text to and from word processors and other programs.

“CLIP:PICTURE” for transferring picture data to and from MacPaint or other programs.

Files that are OPENed to this device, using the mode indicated above, will read/write data directly from/to the Clipboard File stored on the system disk.

The sample program ‘Show Clip’ shows how the clipboard could be read within an application and displayed. You have probably seen many applications that give the user the option to “Show Clipboard”. The program will check to see if the clipboard contains picture data or text and will read the data accordingly and display it in the window. This routine is an example to show how to read from the clipboard, but could be used in your own application to produce the “Show Clipboard” option.

When you make use of EDIT FIELDs in your programs you should keep the Edit menu active so that your EDIT FIELD can be fully edited using the cut, copy and paste feature of the Edit menu. This way the clipboard is being used without having to do a whole lot of programing; however the operation is still manual. The user must decide what to select and copy or cut it into the EDIT FIELD. The same is true for inserting text with the paste option.

If the file is opened to “CLIP:” or “CLIP:TEXT”, the data is read sequentially from the clipboard file. There are actually two clipboard areas. One is the clipboard file and the other is a temporary area in memory. That’s why sometimes the disk turns on when you cut or copy something and other times it doesn’t.

To write text to the clipboard:

• Open the clipboard with OPEN “CLIP:” FOR OUTPUT AS #1 or equivalent.

• Use Write #1 or Print #1 to write your variable to the clipboard file.

• CLOSE #1 to close the file.

To read from the clipboard:

• Open the clipboard with OPEN “CLIP:” FOR OUTPUT AS #1 or equivalent.

• Use INPUT #1 to read variables from the clipboard file.

• CLOSE #1 to close the file.

See the program for an example of this.

You should remember to use the proper format when storing data in the clipboard so that other applications may use the data. For example, the text that a word processor uses would contain format control characters imbedded in the text. These kind of characters should only be left in the text stored in the clipboard if you know that the program that will be reading it will use them. Some things might not matter what format they are stored in and the data can be formatted once it has been read into the new application. Most of the applications available will tell you how the data is formatted, so if you know what the data will be used in, there won’t be any problem. Some help on transfering files to and from the clipboard and other applications can be found on page 55 of the BASIC manual.

Copying pictures is just about as easy as text. To transfer something to MacPaint:

• Use the PICTURE ON statement to record the graphics statements.

• Issue all the graphics statements you need to produce the picture. You don’t have to draw it to record it as a picture.

• Use PICTURE OFF to stop recording graphics.

A good example of this is found in the BASIC manual page 205.

• Next open the clipboard file with OPEN “CLIP:PICTURE” FOR OUTPUT AS #1 (or equavalent statement)

• Send the picture to the clipboard with PRINT #1,PICTURE$

• Close the file: CLOSE #1

Next you can either exit BASIC and paste the picture into MacPaint or save the picture in the Scrapbook to use later.

To transfer MacPaint pictures to BASIC:

• Put the MacPaint picture in the Clipboard

• Open the clipboard file with OPEN “CLIP:PICTURE” FOR INPUT AS #1 (or equavalent statement)

• Transfer the picture to a string variable (called image$ in this case): image$=INPUT$(LOF(1),1)

• Close the file: CLOSE #1

• Draw the Picture to the screen exactly the way it was recored: PICTURE,image$

See the program for an example of reading a picture from the clipboard.

To determine if the data in the clipboard is picture or text we can use the BASIC statement LOF. LOF(1) will return the length of the specified file (in this case our file is “CLIP:”. If the result turns out to be zero, it means that either the data is a picture or the clipboard is empty. So next just read whatever picture Is stored, if any. If the clipboard is empty, the resulting string variable will also be empty.

There is one more way to store text or graphics in the clipboard. I’m not sure that there is a good reason to want to do this though. Using a screen GET, a portion of the screen can be copied into a non-string variable array. This variable can be written to the clipboard for later use. You can then read the clipboard and use a screen PUT, to place the data back on the screen. The screen GET and PUT commands are much more useful in moving sections of the screen image. Since the array used is not a string, it is not in the proper format for MacPaint or for PICTURE statements. I tried to use screen GET and PUT to read the picture of Professor Mac found in last month’s Screen Poke article. The problem is that when the image is directly poked on the screen, BASIC doesn’t recognize it as being anything useful. You can’t record pokes with the PICTURE ON/OFF feature of BASIC. Perhaps one of our readers knows how to change the data from a screen GET format to MacPaint picture format. For most programs you will want to use the other methods mentioned anyway.

In conclusion, figure 1 shows the different ways that data can be stored in the clipboard. Most of these methods are explained fairly well in the BASIC 2.0 manual. (ref. pg. 55-58 for more information on tranfering data between BASIC and other programs. Note there is an error on page 58 where it says PICTURE$,IMAGE$ should be PICTURE, IMAGE$. Also see pg. 205 for PICTURE statement.)

‘     Show Clip
‘     By Dave Kelly
‘     ©MACTUTOR 1985

‘Set up windows
WINDOW 1,”Output Window”, (2,40)-(510,200),1
WINDOW 2,”Clipboard File”,  (2,220)-(510,340),1
WINDOW CLOSE 2
‘Set up menus
MENU 4,0,0,””
MENU 5,0,1,”Windows”
MENU 5,1,1,”Output Window”
MENU 5,2,1,”Show Clipboard”
MENU 5,3,1,”Quit”
ON MENU GOSUB handlemenu
MENU ON
ON DIALOG GOSUB handlewindow
DIALOG ON
EDIT FIELD 1,””,(150,42)-(365,120),1
show:GOTO show:GOSUB showclipboard
handlemenu:  ‘Menu handler
number=MENU(0)
IF number<>5 THEN RETURN
item=MENU(1):MENU
IF item=1 THEN WINDOW 1
IF item=2 THEN GOSUB showclipboard
IF item=3 THEN WINDOW CLOSE 2:WINDOW CLOSE 1:MENU RESET: END
RETURN
handlewindow:  ‘Menu handler
stat=DIALOG(0)
IF stat=3 THEN WINDOW DIALOG(3)
IF stat=4 THEN WINDOW CLOSE DIALOG(4)
RETURN
showclipboard:
WINDOW 2:CLS
DIALOG STOP:MENU STOP
‘Read text from clipboard
OPEN “CLIP:TEXT” FOR INPUT AS #1
IF LOF(1)=0 THEN CLOSE #1:GOTO   do.picture
LOCATE 1,1
WHILE NOT EOF(1)
        INPUT #1,a$:PRINT a$
WEND
CLOSE #1:DIALOG ON:MENU ON
RETURN
do.picture:  ‘Read picture from Clipboard
DIALOG STOP:MENU STOP
OPEN “CLIP:PICTURE” FOR INPUT AS #1
        image$=INPUT$(LOF(1),1)
        PICTURE,image$
CLOSE #1:DIALOG ON:MENU ON:RETURN

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

SoftRAID 5.8.4 - High-quality RAID manag...
SoftRAID allows you to create and manage disk arrays to increase performance and reliability. SoftRAID allows the user to create and manage RAID 4 and 5 volumes, RAID 1+0, and RAID 1 (Mirror) and... Read more
Audio Hijack 3.7.3 - Record and enhance...
Audio Hijack (was Audio Hijack Pro) drastically changes the way you use audio on your computer, giving you the freedom to listen to audio when you want and how you want. Record and enhance any audio... Read more
CleanMyMac X 4.6.15 - Delete files that...
CleanMyMac makes space for the things you love. Sporting a range of ingenious new features, CleanMyMac lets you safely and intelligently scan and clean your entire system, delete large, unused files... Read more
Suitcase Fusion 21.2.1 - Font management...
Suitcase Fusion is the creative professional's font manager. Every professional font manager should deliver the basics: spectacular previews, powerful search tools, and efficient font organization.... Read more
Civilization VI 1.3.6 - Next iteration o...
Civilization® VI is the award-winning experience. Expand your empire across the map, advance your culture, and compete against history’s greatest leaders to build a civilization that will stand the... Read more
Dashlane 6.2042.0 - Password manager and...
Dashlane is an award-winning service that revolutionizes the online experience by replacing the drudgery of everyday transactional processes with convenient, automated simplicity - in other words,... Read more
Airfoil 5.9.2 - Send audio from any app...
Airfoil allows you to send any audio to AirPort Express units, Apple TVs, and even other Macs and PCs, all in sync! It's your audio - everywhere. With Airfoil you can take audio from any... Read more
VirtualBox 6.1.16 - x86 virtualization s...
VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers... Read more
Xcode 12.1 - Integrated development envi...
Xcode includes everything developers need to create great applications for Mac, iPhone, iPad, and Apple Watch. Xcode provides developers a unified workflow for user interface design, coding, testing... Read more
FileZilla 3.51.0 - Fast and reliable FTP...
FileZilla (ported from Windows) is a fast and reliable FTP client and server with lots of useful features and an intuitive interface. Version 3.51.0: Bugfixes and minor changes: Fixed import of... Read more

Latest Forum Discussions

See All

PUBG Mobile has provided yet another upd...
PUBG Mobile has been making a point of publicly mentioning all of their ongoing efforts to vanquish cheating from the popular battle royale. Today two teams within the company have provided updates on their progress. [Read more] | Read more »
Zombieland: AFK Survival is celebrating...
Zombieland: AFK Survival is currently celebrating its one-year anniversary. If you don't quite recognise the name that's because it initially launched as Zombieland: Double Tapper. Anyway, the game is celebrating turning one with two Halloween-... | 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...
If you're playing Genshin Impact without spending money, you'll always need to be looking for ways to optimize your play to maximize rewards without getting stuck in a position where you're tempted to spend. The most obvious trap here is the game'... | Read more »
Genshin Impact Adventurer's Guide
Hello and well met, fellow adventurers of Teyvat! Check out our all-in-one resource for all things Genshin Impact. We'll be sure to add more as we keep playing the game, so be sure to come back here to check for updates! [Read more] | Read more »
Genshin Impact Currency Guide - What...
Genshin Impact is great fun, but make no mistake: this is a gacha game. It is designed specifically to suck away time and money from you, and one of the ways the game does this is by offering a drip-feed of currencies you will feel compelled to... | Read more »
XCOM 2 Collection on iOS now available f...
The XCOM 2 Collection, which was recently announced to be coming to iOS in November, is now available to pre-order on the App Store. [Read more] | Read more »
Presidents Run has returned for the 2020...
IKIN's popular endless runner Presidents Run has returned to iOS and Android just in time for the 2020 election season. It will see players choosing their favourite candidate and guiding them on a literal run for presidency to gather as many votes... | Read more »
New update for Cookies Must Die adds new...
A new update for Rebel Twins’ platformer shooter Cookies Must Die is coming out this week. The update adds quite a bit to the game, including new levels and characters to play around with. [Read more] | Read more »
Genshin Impact Guide - How to Beat Pyro...
The end game of Genshin Impact largely revolves around spending resin to take on world bosses and clear domain challenges. These fights grant amazing rewards like rare artifacts and ascension materials for weapons and adventurers, but obviously... | Read more »

Price Scanner via MacPrices.net

Use our exclusive iPhone Price Trackers to fi...
Looking for a new Apple iPhone 12 or 12 Pro? Perhaps a deal on last year’s iPhone 11? Check out our iPhone Price Tracker here at MacPrices.net. We track new and clearance iPhone prices from Apple as... Read more
Weekend deal: $100 off 13″ MacBook Airs at Am...
Amazon has new 2020 13″ MacBook Airs on sale for $100 off Apple’s MSRP, starting at only $899. Their prices are the lowest available for new MacBooks from any Apple resellers. These are the same 13″... Read more
New 10.9″ 64GB Apple iPad Air on sale for $55...
Amazon has Apple’s new 2020 10.9″ 64GB WiFi iPad Air on sale today for $549.99 shipped. That’s $40 off MSRP. Pre-orders are available today at this discounted price, and Amazon states that the iPad... Read more
Get a clearance 2019 27″ 5K iMac for up to $5...
Apple has Certified Refurbished 2019 27″ 5K iMacs available starting at $1439 and up to $520 off their original MSRP. Apple’s one-year warranty is standard and shipping is free. The following... Read more
AT&T offers the Apple iPhone 11 for $10/m...
AT&T is offering Apple’s 64GB iPhone 11 for $10 per month, for customers opening a new line of service, no trade-in required. Discount is applied via monthly bill credits over a 30 month period.... Read more
Apple’s 2020 11″ iPad Pros on sale today for...
Apple reseller Expercom has new 2020 11″ Apple iPad Pros on sale for $50-$75 off MSRP, with prices starting at $749. These are the same iPad Pros sold by Apple in their retail and online stores: – 11... Read more
Did Apple Drop The Ball By Not Branding Its C...
EDITORIAL: 10.21.20 – In the branding game, your marketing strategy can either be a hit or a miss and the latter is the case for Apple when it missed out on an opportunity to brand its “SE” series of... Read more
27″ 6-core and 8-core iMacs on sale for up to...
Adorama has Apple’s 2020 27″ 6-core and 8-core iMacs on sale today for $50-$100 off MSRP, with prices starting at $1749. Shipping is free: – 27″ 3.1GHz 6-core iMac: $1749, save $50 – 27″ 3.3GHz 6-... Read more
Apple’s 16″ MacBook Pros are on sale for $300...
B&H Photo has 16″ MacBook Pros on sale today for $300-$350 off Apple’s MSRP, starting at $2099. Expedited shipping is free to many addresses in the US. Their prices are among the lowest available... Read more
Apple has 2020 13″ MacBook Airs available sta...
Apple has a full line of Certified Refurbished 2020 13″ MacBook Airs available starting at only $849 and up to $200 off the cost of new Airs. Each MacBook features a new outer case, comes with a... Read more

Jobs Board

Dental Receptionist - *Apple* Valley Clinic...
Dental Receptionist - Apple Valley Clinic + Job ID: 57314 + Department: Apple Valley Dental + City: Apple Valley, MN + Location: HP - Apple Valley Clinic Read more
*Apple* Mobility Specialist - Best Buy (Unit...
**788165BR** **Job Title:** Apple Mobility Specialist **Job Category:** Store Associates **Store Number or Department:** 001013-Virginia Commons-Store **Job Read more
Cub Foods - *Apple* Valley - Now Hiring Par...
Cub Foods - Apple Valley - Now Hiring Part Time! United States of America, Minnesota, Apple Valley Retail Post Date Oct 08, 2020 Requisition # 124800 Sign Up for Read more
*Apple* Mobility Specialist - Best Buy (Unit...
**784631BR** **Job Title:** Apple Mobility Specialist **Job Category:** Store Associates **Store Number or Department:** 000522-Baxter-Store **Job Description:** The Read more
Senior Data Engineer - *Apple* - Theorem, L...
Job Summary Apple is seeking an experienced, detail-minded data engineeringconsultant to join our worldwide business development and strategy team. If you are Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.