Read QR bar codes

This library is capable also to read QR and bar codes. The supported standards are:

• UPC-A
  

• UPC-E
  

• EAN-8
  

• EAN-13
  

• Code 39
  

• Code 93
  

• Code 128
  

• ITF
  

• Codabar
  

• RSS-14 (all variants)
  

• QR Code
  

• Data Matrix
  

• Aztec (‘beta’ quality)
  

• PDF 417 (‘alpha’ quality)
  

In order to enable this feature, set search_mode to search_QRcodes or search_all

Multiple QR / bar codes

You can also read multiple QR / bar codes a time. To do that you will need to define ROIs, regions of interest, where to “look for” readable codes.

- (void)addQRRois
{
    // Add regions to match several QR / bar codes
    Roi *ROI1 = [[Roi alloc] initWithRect:CGRectMake(0, 0, 160, 240)];
    Roi *ROI2 = [[Roi alloc] initWithRect:CGRectMake(0, 240, 160, 240)];
    Roi *ROI3 = [[Roi alloc] initWithRect:CGRectMake(160, 0, 160, 240)];
    Roi *ROI4 = [[Roi alloc] initWithRect:CGRectMake(160, 240, 160, 240)];
        
    // Add them to the system
    [_myVs addQRRect:ROI1];
    [_myVs addQRRect:ROI2];
    [_myVs addQRRect:ROI3];
    [_myVs addQRRect:ROI4];
}

QR codes callbacks

When a single or multiple QR / bar code is/are read, the QRMatchedProtocol protocol will give you the value/s:

- (void)singleQRMatchedResult:(NSString *)res
{
    if ( ![res isEqualToString:@""])
    {
        VSLog(@"QR / bar code detected --> %@", res);
    }
}
 
- (void)multipleQRMatchedResult:(NSArray *)codes
{
    NSString *code = @"";
     
    for (int i = 0; i < [codes count]; i++)
    {
        Roi *roi = [codes objectAtIndex:i];
         
        code = 1;
    }
     
    VSLog(@"Multiple QR / bar codes detected --> %@", code);
}