Adding upstream version 0.23.93.upstream/0.23.93upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+ZBar SDK Integration Tutorial
+=============================
+
+.. image:: ReaderSample.png
+   :alt: Screenshot of the ReaderSample app
+   :width: 414
+   :height: 770
+   :scale: 40
+   :class: floatright
+
+This tutorial will quickly get you up and running with the ZBar iPhone SDK.
+
+We will develop a very simple app that presents a button the user can tap to
+invoke the barcode reader and then displays the results.  Interface Builder
+will be used to create the interface.
+
+The completed project is also available with the distributed SDK under
+:file:`Examples/ReaderSample`.
+
+
+Create the App
+--------------
+
+1. Open Xcode; you must have version 4.5.1 or later.
+
+2. Create a new project using the "View-based Application" template.  Name the
+   project "ReaderSample".  Save it wherever you like.
+
+3. Open :file:`ReaderSampleViewController.xib`
+
+4. Drag a Round Rect Button onto the view and title it "Scan".  Customize the
+   placement and appearance as you like.
+
+5. Drag an Image View onto the view.  Size it to fill about half of the
+   remaining space.  Change the view mode to Aspect Fit.
+
+6. Drag a Text View onto the view and size it to fill the remaining space.
+   Change the default text to "No barcode scanned" or something.  De-select
+   "Editable"
+
+7. Add connections to the interface elements in the code; open
+   :file:`ReaderSampleViewController.h` and change the interface to::
+
+      @interface ReaderSampleViewController : UIViewController
+      {
+          UIImageView *resultImage;
+          UITextView *resultText;
+      }
+      @property (nonatomic, retain) IBOutlet UIImageView *resultImage;
+      @property (nonatomic, retain) IBOutlet UITextView *resultText;
+      - (IBAction) scanButtonTapped;
+      @end
+
+8. Now we can finish the interface connections - open
+   :file:`ReaderSampleViewController.xib` and make these connections:
+
+   * Connect ReaderSampleViewController ``resultImage`` outlet to the
+     ImageView.
+   * Connect ReaderSampleViewController ``resultText`` outlet to the TextView.
+   * Connect ReaderSampleViewController ``scanButtonTapped`` action to the
+     RoundedRectButton(Scan) event ``TouchUpInside``.
+
+   Consult the Xcode documentation if you need help making these connections.
+   Make sure you save the XIB once they are finished.
+
+9. Finish the implementation in :file:`ReaderSampleViewController.m`::
+
+      @synthesize resultImage, resultText;
+      
+      - (IBAction) scanButtonTapped
+      {
+          NSLog(@"TBD: scan barcode here...");
+      }
+      
+      - (void) dealloc
+      {
+          self.resultImage = nil;
+          self.resultText = nil;
+          [super dealloc];
+      }
+      
+      - (BOOL) shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation) interfaceOrientation
+      {
+          return(YES);
+      }
+
+   This stub for scanButtonTapped is temporary, we'll fix it in a minute...
+
+Although it doesn't do much yet, you should now have a working skeleton app
+that you can build and run.
+
+
+Integrate the Reader
+--------------------
+
+Now for the exciting part - let's add a barcode reader!
+
+1. If you have not done so already, download the latest SDK from
+   http://zbar.sourceforge.net/iphone
+
+2. Double-click the disk image, ZBarSDK-|version|.dmg in the Finder to open it.
+
+3. Drag the :file:`ZBarSDK` folder into your Xcode project.  Make sure that
+   the "Copy Items into destination group's folder" checkbox is checked.
+
+4. Open the target build settings and find ``Link Binary With Libraries``.
+   Click the ``+`` and add each of these (NB hold down command for multiple
+   selection):
+
+   * AVFoundation.framework
+   * CoreMedia.framework
+   * CoreVideo.framework
+   * QuartzCore.framework
+   * libiconv.dylib
+
+   .. warning::
+
+      Link order may be important for some versions of Xcode; the libraries
+      referenced above should be listed *before* :file:`libzbar.a` in the
+      link order.
+
+5. Import the SDK header.  You will usually want to prefix it, so add it to
+   :file:`ReaderSample-prefix.pch`::
+
+      // ADD: import barcode reader APIs
+      #import "ZBarSDK.h"
+
+6. Declare support for the delegate protocol in
+   :file:`ReaderSampleViewController.h`::
+
+      @interface ReaderSampleViewController : UIViewController
+          // ADD: delegate protocol
+          < ZBarReaderDelegate >
+      {
+      ...
+
+7. Re-implement scanButtonTapped to present a barcode reader when the user
+   taps the Scan button.  In :file:`ReaderSampleViewController.m`::
+
+      - (IBAction) scanButtonTapped
+      {
+          // ADD: present a barcode reader that scans from the camera feed
+          ZBarReaderViewController *reader = [[ZBarReaderViewController alloc] init];
+          reader.readerDelegate = self;
+          reader.supportedOrientationsMask = ZBarOrientationMaskAll;
+      
+          ZBarImageScanner *scanner = reader.scanner;
+          // TODO: (optional) additional reader configuration here
+      
+          // EXAMPLE: disable rarely used I2/5 to improve performance
+          [scanner setSymbology: ZBAR_I25
+                   config: ZBAR_CFG_ENABLE
+                   to: 0];
+      
+          // present and release the controller
+          [self presentModalViewController: reader
+                animated: YES];
+          [reader release];
+      }
+
+8. Finally, implement the delegate method to do something useful with the
+   results.  Still in :file:`ReaderSampleViewController.m`::
+
+      - (void) imagePickerController: (UIImagePickerController*) reader
+       didFinishPickingMediaWithInfo: (NSDictionary*) info
+      {
+          // ADD: get the decode results
+          id<NSFastEnumeration> results =
+              [info objectForKey: ZBarReaderControllerResults];
+          ZBarSymbol *symbol = nil;
+          for(symbol in results)
+              // EXAMPLE: just grab the first barcode
+              break;
+      
+          // EXAMPLE: do something useful with the barcode data
+          resultText.text = symbol.data;
+      
+          // EXAMPLE: do something useful with the barcode image
+          resultImage.image =
+              [info objectForKey: UIImagePickerControllerOriginalImage];
+      
+          // ADD: dismiss the controller (NB dismiss from the *reader*!)
+          [reader dismissModalViewControllerAnimated: YES];
+      }
+
+And that's it!
+
+
+Testing
+-------
+
+1. Save everything (don't forget to save MyAppViewController.xib).
+
+2. Build and Run the project.
+
+3. Tap the Scan button.
+
+4. Aim at barcode.
+
+5. Enjoy the sweet fruits of your minimal labor
+
+
+Where to go from here
+---------------------
+
+You can learn more about using the reader APIs to scan barcodes from
+:doc:`camera` or :doc:`picker`.  Use the :doc:`apiref` to find details about a
+particular interface.
+
+
+Troubleshooting
+---------------
+
+We take great care to ensure this tutorial is working as described.  However,
+if you do have a problem
+
+1. Make sure you followed the instructions exactly - every detail is
+   important.
+2. Start from scratch with a new project and follow the instructions
+   *exactly*.
+3. Try the ReaderSample distributed with the SDK and compare your work with
+   that.
+4. If you are unable to get things working, you may post your frustrations in
+   the project `iPhone Developers Forum`_.  Please be very specific about your
+   problem, post the complete text of any errors, etc.
+
+.. _`iPhone Developers Forum`:
+   http://sourceforge.net/projects/zbar/forums/forum/1072195