NSError *error = nil; ZXMultiFormatWriter *writer = [ZXMultiFormatWriter writer]; ZXBitMatrix* result = [writer encode:@"A string to encode" format:kBarcodeFormatQRCode width:500 height:500 error:&error]; if (result) { CGImageRef image = [[ZXImage imageWithMatrix:result] cgimage]; // This CGImageRef image can be placed in a UIImage, NSImage, or written to a file. } else { NSString *errorMessage = [error localizedDescription]; }

CGImageRef imageToDecode; // Given a CGImage in which we are looking for barcodes ZXLuminanceSource *source = [[[ZXCGImageLuminanceSource alloc] initWithCGImage:imageToDecode] autorelease]; ZXBinaryBitmap *bitmap = [ZXBinaryBitmap binaryBitmapWithBinarizer:[ZXHybridBinarizer binarizerWithSource:source]]; NSError *error = nil; // There are a number of hints we can give to the reader, including // possible formats, allowed lengths, and the string encoding. ZXDecodeHints *hints = [ZXDecodeHints hints]; ZXMultiFormatReader *reader = [ZXMultiFormatReader reader]; ZXResult *result = [reader decode:bitmap hints:hints error:&error]; if (result) { // The coded result as a string. The raw data can be accessed with // result.rawBytes and result.length. NSString *contents = result.text; // The barcode format, such as a QR code or UPC-A ZXBarcodeFormat format = result.barcodeFormat; } else { // Use error to determine why we didn't get a result, such as a barcode // not being found, an invalid checksum, or a format inconsistency. }