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The pattern I have just shown puts the selection of the DFC queue into the LDD, which is useful if all the physical channels are likely to talk to the same hardware registers or memory, because it ensures that all requests for all channels will be serviced in the same kernel thread. The kernel provides two standard DFC queues (running on two dedicated kernel threads, DfcThread0 and DfcThread1). These are available for use by device drivers and are obtained using Kern::DfcQue0() and Kern::DfcQue1(). DfcThread0 is a general-purpose low priority thread, which is currently used by serial comms, sound, Ethernet, keyboard and digitizer device drivers, and is suitable for simple device drivers without very stringent real-time requirements. DfcThread1 is a higher priority thread and should be used with care, since inappropriate use of this thread may adversely affect the accuracy of nanokernel timers. Some device drivers create and use their own thread. This may be speci ed by the logical channel as I have described previously, or by the physical device itself. The local media sub-system uses the latter method.

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Tested: Java midlet QR code readers - James Royal-Lawson
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It all depends on the library where you get your code from: Here below is from Maven:

<!DOCTYPE html> <html> <head> <script language= javascript > //colors: 960, fff, 000 CanvasMaster=new Object(); CanvasMaster.showCanvas=function() { canvasNow = document.getElementById( briefCase ); contextNow = canvasNow.getContext( 2d ); contextNow.beginPath(); contextNow.moveTo(40,20); contextNow.lineTo(72,20); contextNow.lineTo(72,38);

The LDD provides a generic interface suitable for all types of media driver, and to allow multiple media drivers to operate concurrently, each media driver is responsible for specifying a DFC queue within which to service requests. The caution I gave earlier about using DfcThread1 is even more appropriate if your driver creates a thread with higher priority than DfcThread1. In both cases, you must take care not to delay the nanokernel timer DFC by more than 16 ticks. The following code shows how my logical channel queries the physical device to obtain a device-speci c DFC queue:

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Barcode Scanner implementation on Java - Stack Overflow
16 Nov 2011 ... I used Honeywell Voyager MS9540 USB barcode scanner . ... My java program reads all input from the specified serial port and writes the ...

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27 Sep 2010 ... There is an open source Java library called 'zxing' (Zebra Crossing) which can ... result = reader .decode(bitmap); System.out.println(" Barcode text is " + result. ... From http://www.vineetmanohar.com/2010/09/ java - barcode - api / ...

TInt DSimpleSerialChannel::DoCreate(TInt aUnit, const TDesC8* anInfo, const TVersion &aVer) { // Security and version control code as shown in the // previous example are omitted for clarity. SetDfcQ(((DComm*)iPdd)->DfcQ(aUnit)); iMsgQ.Receive(); return KErrNone; }

contextNow.lineTo(88,38); contextNow.lineTo(88,78); contextNow.lineTo(28,78); contextNow.lineTo(28,38); contextNow.lineTo(40,38); contextNow.lineTo(40,20); contextNow.closePath(); contextNow.fillStyle = #960 ; contextNow.fill(); contextNow.beginPath(); contextNow.moveTo(46,26); contextNow.lineTo(66,26); contextNow.lineTo(66,38); contextNow.lineTo(46,38); contextNow.closePath(); contextNow.fillStyle = #fff ; contextNow.fill(); } </script> <style type= text/css > body { font-family:Verdana; color:#000; } </style> <title>Filled Line Drawing</title> </head> <body onLoad= CanvasMaster.showCanvas() > <article> <figure> <canvas id= briefCase width= 90 height= 80 > If you can identify the drawing, you win a jillion dollars! Oh, I m sorry . . . looks like you don t have an HTML5 browser.</canvas> <figcaption> <br/> Picasso Was Here</figcaption> </figure> </article> </body> </html>

But then, we have all these books, and they tell us how to code the query.

The physical channel can creates its DFC queue using the following kernel API:

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Java Barcode API | Vineet Manohar's blog
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Java Barcode API - DZone Java
27 Sep 2010 ... There is an open source Java library called 'zxing' (Zebra Crossing) which ... You can read the bar code by first loading the image as an input ...

When you test this revision, the results are pretty close the original drawing. Compare Figure 13-10 and Figure 13-13 to see how close the program-generated image is to the original. You can use the lines to draw anything that has no curves. In the next section, you ll see how to add curves to your artistic canvas tools.

TInt r=Kern::DfcQInit(&iDfcQ, iPriority, iName);

Alternatively, the physical channel can obtain the DFC queue from some other source, such as a kernel extension. For example, consider the peripheral bus controller which services removable media devices such as PC Card and SDIO devices. Such a controller would typically use a dedicated DFC thread to synchronize its requests, which would be made available for use by device drivers.

Making curves, even with drawing tools, is trickier than drawing straight lines. To understand how to make curves, I ll start this section with a discussion of arcs and the canvas DOM methods for creating them. We ll look at some of the geometry, but not a lot. (You do need a little understanding of geometry, but don t worry it s basic.) The first thing that you need to understand is the difference between degrees and radians. Most people know that a circle has 360 degrees. On a compass rose, 360 or 0 degrees (12 o clock) is due north. As you move clockwise to 90 degrees (3 o clock), the compass points east; at 180 degrees (6 o clock), south; and at 270 degrees (9 o clock), west. However, you have to use radians instead of degrees, so all degrees must be converted to radians. Use the following formula: Radians = (PI 180) degrees So, let s say that you want to know the radians for due west (9 o clock), 270 degrees: Radians = (3.14159265 180) = 0.01745329251994 Radians = 0.01745329251994 270 Radians = 4.71238898 A simple way to do the same thing is to just multiply degrees by 0.01745329251994 or in JavaScript write:

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Barcode in Java | Generate, Read, Scan Barcode in Java using ...
Easy to Integrate Barcode Generation features in your Java applicatons. Generate barcodes in Java Class, J2SE applications ; Generate barcodes in Java ...

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Scan Barcode in HTML5 / JavaScript - Stack Overflow
Most of the time barcode scanners act like a keyboard - they "type" the result. You capture it by either listening to keypress events, or by listening to changes in ...

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