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POWrong decoding of barcodes also in ZBAR SDK example
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  1. POWrong decoding of barcodes also in ZBAR SDK example
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    copied!<p>I am using the ZBarSDK with a project for iPhone. </p> <p>I am using ZBar as an embeded reader. Basically hooking up a UIView in Interface Builder. Changing the class to <code>ZBarReaderView</code> and implementing the delegate method <code>-(void)readerView: (ZBarReaderView*) view didReadSymbols: (ZBarSymbolSet*) syms fromImage: (UIImage*) img</code>.</p> <p>This works fine most of the time. There are however barcodes that apparently do not scan correctly. The first block gets interpreted wrong. I get something like <code>5008914...</code> the next time I get <code>7001814...</code> and then I get the correct <code>4001954...</code></p> <p>I went back to the "EmbedReader" example from the SDK and looked to see if I could find any tweaks that might need to be made and discovered that it too produced the same error. If I look at the example "ReaderSample" the error does not occur, however this useses an instance of <code>ZBarReaderViewController</code>. </p> <p>I then tried to change the <code>ZBAR_CFG_X_DENSITY</code> and <code>ZBAR_CFG_Y_DENSITY</code> both to 3 in my <code>viewWillAppear</code> method, but that had no influence.</p> <p>What is the difference between the scan mechanism of <code>ZBarReaderViewController</code> and <code>ZBarReaderView</code>? What can I do to supress wrong results?</p> <p>Thanks</p> <p>Here some relevant code snippets. </p> <p>In the .h</p> <pre><code>@interface ScanVC:UIViewController&lt;ZBarReaderViewDelegate&gt; { IBOutlet ZBarReaderView *readerView; ... } ... @property (nonatomic, retain) IBOutlet ZBarReaderView *readerView; ... </code></pre> <p>In the .m</p> <pre><code>@synthesize readerView; ... -(void) viewDidAppear: (BOOL) animated { [[readerView scanner] setSymbology:0 config:ZBAR_CFG_X_DENSITY to: 3]; [[readerView scanner] setSymbology:0 config:ZBAR_CFG_Y_DENSITY to: 3]; [[readerView scanner] setSymbology:ZBAR_I25 config:ZBAR_CFG_ENABLE to:0]; [readerView start]; } ... - (void) readerView: (ZBarReaderView*) view didReadSymbols: (ZBarSymbolSet*) syms fromImage: (UIImage*) img { for(ZBarSymbol *sym in syms) { ... } ... } ... -(void)viewDidLoad { [readerView setDelegate: self]; } </code></pre>
 

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