On the iphone, ZXing always throws NotFoundException

Xingchi Wang

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Jul 9, 2013, 10:16:22 AM7/9/13

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I used Zxing on my app, on iOS 6.0, when I use ZXingWidgetController like the ScanTest Sample,

ZXingWidgetController *widController =

[[ZXingWidgetController alloc] initWithDelegate:self showCancel:YES OneDMode:NO];

NSMutableSet *readers = [[NSMutableSet alloc ] init];

MultiFormatReader* reader = [[MultiFormatReader alloc] init];

[readers addObject:reader];

widController.readers = readers;

but it always crashed at the throw NotFoundException in some methods of UPCEANReader,
it's so strange, it not always crash at the same method, it crash some method, but all crash reason is throw NotFoundException.
Could someone encounter this?

Steven Parkes

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Jul 9, 2013, 10:41:04 AM7/9/13

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It's expected that the decoder won't find codes in any individual frame.

The widget should be catching this, I think. Do you have a stack trace of the crash/problem?

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Xingchi Wang

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Jul 9, 2013, 10:43:39 AM7/9/13

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Thanks Steven,
This is the stack trace

#1 0x0009b208 in zxing::oned::OneDReader::recordPattern(zxing::Ref<zxing::BitArray>, int, std::vector<int, std::allocator<int> >&) at /Users/twer/Workspace/iBookHouse/zxing/iphone/ZXingWidget/../../cpp/core/src/zxing/oned/OneDReader.cpp:223

#2 0x0009d772 in zxing::oned::UPCEANReader::decodeDigit(zxing::Ref<zxing::BitArray>, std::vector<int, std::allocator<int> >&, int, std::vector<int const*, std::allocator<int const*> > const&) at /Users/twer/Workspace/iBookHouse/zxing/iphone/ZXingWidget/../../cpp/core/src/zxing/oned/UPCEANReader.cpp:242

#3 0x00093dfa in zxing::oned::EAN13Reader::decodeMiddle(zxing::Ref<zxing::BitArray>, zxing::oned::OneDReader::Range const&, std::string&) at /Users/twer/Workspace/iBookHouse/zxing/iphone/ZXingWidget/../../cpp/core/src/zxing/oned/EAN13Reader.cpp:46

#4 0x0009cbf6 in zxing::oned::UPCEANReader::decodeRow(int, zxing::Ref<zxing::BitArray>, zxing::oned::OneDReader::Range const&) at /Users/twer/Workspace/iBookHouse/zxing/iphone/ZXingWidget/../../cpp/core/src/zxing/oned/UPCEANReader.cpp:128

#5 0x00098bf8 in zxing::oned::MultiFormatUPCEANReader::decodeRow(int, zxing::Ref<zxing::BitArray>) at /Users/twer/Workspace/iBookHouse/zxing/iphone/ZXingWidget/../../cpp/core/src/zxing/oned/MultiFormatUPCEANReader.cpp:71

#6 0x000971be in zxing::oned::MultiFormatOneDReader::decodeRow(int, zxing::Ref<zxing::BitArray>) at /Users/twer/Workspace/iBookHouse/zxing/iphone/ZXingWidget/../../cpp/core/src/zxing/oned/MultiFormatOneDReader.cpp:88

#7 0x0009a9f2 in zxing::oned::OneDReader::doDecode(zxing::Ref<zxing::BinaryBitmap>, zxing::DecodeHints) at /Users/twer/Workspace/iBookHouse/zxing/iphone/ZXingWidget/../../cpp/core/src/zxing/oned/OneDReader.cpp:127

#8 0x0009a294 in zxing::oned::OneDReader::decode(zxing::Ref<zxing::BinaryBitmap>, zxing::DecodeHints) at /Users/twer/Workspace/iBookHouse/zxing/iphone/ZXingWidget/../../cpp/core/src/zxing/oned/OneDReader.cpp:41

#9 0x0008ede2 in zxing::MultiFormatReader::decodeInternal(zxing::Ref<zxing::BinaryBitmap>) at /Users/twer/Workspace/iBookHouse/zxing/iphone/ZXingWidget/../../cpp/core/src/zxing/MultiFormatReader.cpp:115

#10 0x0008efda in zxing::MultiFormatReader::decode(zxing::Ref<zxing::BinaryBitmap>, zxing::DecodeHints) at /Users/twer/Workspace/iBookHouse/zxing/iphone/ZXingWidget/../../cpp/core/src/zxing/MultiFormatReader.cpp:45

could this help you?

在 2013年7月9日星期二UTC+8下午10时41分04秒，Steven Parkes写道：

Xingchi Wang

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Jul 9, 2013, 10:46:05 AM7/9/13

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Sorry to miss something, this whole stack trace for crash