openharmony hi3518开发板实现扫码原创精华

我曾是少年_

发布于 2021-9-29 17:34

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前期准备

1、开发板烧入鸿蒙系统

2、下载轻量/小型/标准系统（2.0 Canary）源码

3、下载zxing c++版本

配置

1、将zxing项目放入/SambaShare/code-2.0-canary/third_party目录下

2、找到/SambaShare/code-2.0-canary/applications/sample/camera/media目录，打开BUILD.gn进行配置

3、include_dirs中加入//third_party/zxing/core/src

4、sources中加入所有zxing相关的cpp

sources = [
"camera_sample.cpp",
"ImageReaderSource.cpp",
"jpgd.cpp",
"lodepng.cpp",
"//third_party/zxing/core/src/zxing/BarcodeFormat.cpp",
"//third_party/zxing/core/src/zxing/Binarizer.cpp",
"//third_party/zxing/core/src/zxing/BinaryBitmap.cpp",
"//third_party/zxing/core/src/zxing/ChecksumException.cpp",
"//third_party/zxing/core/src/zxing/DecodeHints.cpp",
"//third_party/zxing/core/src/zxing/Exception.cpp",
"//third_party/zxing/core/src/zxing/FormatException.cpp",
"//third_party/zxing/core/src/zxing/InvertedLuminanceSource.cpp",
"//third_party/zxing/core/src/zxing/LuminanceSource.cpp",
"//third_party/zxing/core/src/zxing/MultiFormatReader.cpp",
"//third_party/zxing/core/src/zxing/Reader.cpp",
"//third_party/zxing/core/src/zxing/Result.cpp",
"//third_party/zxing/core/src/zxing/ResultIO.cpp",
"//third_party/zxing/core/src/zxing/ResultPoint.cpp",
"//third_party/zxing/core/src/zxing/ResultPointCallback.cpp",
"//third_party/zxing/core/src/zxing/aztec/AztecDetectorResult.cpp",
"//third_party/zxing/core/src/zxing/aztec/AztecReader.cpp",
"//third_party/zxing/core/src/zxing/aztec/decoder/Decoder.cpp",
"//third_party/zxing/core/src/zxing/aztec/detector/Detector.cpp",
"//third_party/zxing/core/src/zxing/common/BitArray.cpp",
"//third_party/zxing/core/src/zxing/common/BitArrayIO.cpp",
"//third_party/zxing/core/src/zxing/common/BitMatrix.cpp",
"//third_party/zxing/core/src/zxing/common/BitSource.cpp",
"//third_party/zxing/core/src/zxing/common/CharacterSetECI.cpp",
"//third_party/zxing/core/src/zxing/common/DecoderResult.cpp",
"//third_party/zxing/core/src/zxing/common/DetectorResult.cpp",
"//third_party/zxing/core/src/zxing/common/GlobalHistogramBinarizer.cpp",
"//third_party/zxing/core/src/zxing/common/GreyscaleLuminanceSource.cpp",
"//third_party/zxing/core/src/zxing/common/GreyscaleRotatedLuminanceSource.cpp",
"//third_party/zxing/core/src/zxing/common/GridSampler.cpp",
"//third_party/zxing/core/src/zxing/common/HybridBinarizer.cpp",
"//third_party/zxing/core/src/zxing/common/IllegalArgumentException.cpp",
"//third_party/zxing/core/src/zxing/common/PerspectiveTransform.cpp",
"//third_party/zxing/core/src/zxing/common/Str.cpp",
"//third_party/zxing/core/src/zxing/common/StringUtils.cpp",
"//third_party/zxing/core/src/zxing/common/detector/MonochromeRectangleDetector.cpp",
"//third_party/zxing/core/src/zxing/common/detector/WhiteRectangleDetector.cpp",
"//third_party/zxing/core/src/zxing/common/reedsolomon/GenericGF.cpp",
"//third_party/zxing/core/src/zxing/common/reedsolomon/GenericGFPoly.cpp",
"//third_party/zxing/core/src/zxing/common/reedsolomon/ReedSolomonDecoder.cpp",
"//third_party/zxing/core/src/zxing/common/reedsolomon/ReedSolomonException.cpp",
"//third_party/zxing/core/src/zxing/datamatrix/DataMatrixReader.cpp",
"//third_party/zxing/core/src/zxing/datamatrix/Version.cpp",
"//third_party/zxing/core/src/zxing/datamatrix/decoder/BitMatrixParser.cpp",
"//third_party/zxing/core/src/zxing/datamatrix/decoder/DataBlock.cpp",
"//third_party/zxing/core/src/zxing/datamatrix/decoder/DecodedBitStreamParser.cpp",
"//third_party/zxing/core/src/zxing/datamatrix/decoder/Decoder.cpp",
"//third_party/zxing/core/src/zxing/datamatrix/detector/CornerPoint.cpp",
"//third_party/zxing/core/src/zxing/datamatrix/detector/Detector.cpp",
"//third_party/zxing/core/src/zxing/datamatrix/detector/DetectorException.cpp",
"//third_party/zxing/core/src/zxing/multi/ByQuadrantReader.cpp",
"//third_party/zxing/core/src/zxing/multi/GenericMultipleBarcodeReader.cpp",
"//third_party/zxing/core/src/zxing/multi/MultipleBarcodeReader.cpp",
"//third_party/zxing/core/src/zxing/multi/qrcode/QRCodeMultiReader.cpp",
"//third_party/zxing/core/src/zxing/multi/qrcode/detector/MultiDetector.cpp",
"//third_party/zxing/core/src/zxing/multi/qrcode/detector/MultiFinderPatternFinder.cpp",
"//third_party/zxing/core/src/zxing/oned/CodaBarReader.cpp",
"//third_party/zxing/core/src/zxing/oned/Code39Reader.cpp",
"//third_party/zxing/core/src/zxing/oned/Code93Reader.cpp",
"//third_party/zxing/core/src/zxing/oned/Code128Reader.cpp",
"//third_party/zxing/core/src/zxing/oned/EAN8Reader.cpp",
"//third_party/zxing/core/src/zxing/oned/EAN13Reader.cpp",
"//third_party/zxing/core/src/zxing/oned/ITFReader.cpp",
"//third_party/zxing/core/src/zxing/oned/MultiFormatOneDReader.cpp",
"//third_party/zxing/core/src/zxing/oned/MultiFormatUPCEANReader.cpp",
"//third_party/zxing/core/src/zxing/oned/OneDReader.cpp",
"//third_party/zxing/core/src/zxing/oned/OneDResultPoint.cpp",
"//third_party/zxing/core/src/zxing/oned/UPCAReader.cpp",
"//third_party/zxing/core/src/zxing/oned/UPCEANReader.cpp",
"//third_party/zxing/core/src/zxing/oned/UPCEReader.cpp",
"//third_party/zxing/core/src/zxing/pdf417/PDF417Reader.cpp",
"//third_party/zxing/core/src/zxing/pdf417/decoder/BitMatrixParser.cpp",
"//third_party/zxing/core/src/zxing/pdf417/decoder/DecodedBitStreamParser.cpp",
"//third_party/zxing/core/src/zxing/pdf417/decoder/Decoder.cpp",
"//third_party/zxing/core/src/zxing/pdf417/decoder/ec/ErrorCorrection.cpp",
"//third_party/zxing/core/src/zxing/pdf417/decoder/ec/ModulusGF.cpp",
"//third_party/zxing/core/src/zxing/pdf417/decoder/ec/ModulusPoly.cpp",
"//third_party/zxing/core/src/zxing/pdf417/detector/Detector.cpp",
"//third_party/zxing/core/src/zxing/pdf417/detector/LinesSampler.cpp",
"//third_party/zxing/core/src/zxing/qrcode/ErrorCorrectionLevel.cpp",
"//third_party/zxing/core/src/zxing/qrcode/FormatInformation.cpp",
"//third_party/zxing/core/src/zxing/qrcode/QRCodeReader.cpp",
"//third_party/zxing/core/src/zxing/qrcode/Version.cpp",
"//third_party/zxing/core/src/zxing/qrcode/decoder/BitMatrixParser.cpp",
"//third_party/zxing/core/src/zxing/qrcode/decoder/DataBlock.cpp",
"//third_party/zxing/core/src/zxing/qrcode/decoder/DataMask.cpp",
"//third_party/zxing/core/src/zxing/qrcode/decoder/DecodedBitStreamParser.cpp",
"//third_party/zxing/core/src/zxing/qrcode/decoder/Decoder.cpp",
"//third_party/zxing/core/src/zxing/qrcode/decoder/Mode.cpp",
"//third_party/zxing/core/src/zxing/qrcode/detector/AlignmentPattern.cpp",
"//third_party/zxing/core/src/zxing/qrcode/detector/AlignmentPatternFinder.cpp",
"//third_party/zxing/core/src/zxing/qrcode/detector/Detector.cpp",
"//third_party/zxing/core/src/zxing/qrcode/detector/FinderPattern.cpp",
"//third_party/zxing/core/src/zxing/qrcode/detector/FinderPatternFinder.cpp",
"//third_party/zxing/core/src/zxing/qrcode/detector/FinderPatternInfo.cpp",
"//third_party/zxing/core/src/bigint/BigInteger.cc",
"//third_party/zxing/core/src/bigint/BigIntegerAlgorithms.cc",
"//third_party/zxing/core/src/bigint/BigIntegerUtils.cc",
"//third_party/zxing/core/src/bigint/BigUnsigned.cc",
"//third_party/zxing/core/src/bigint/BigUnsignedInABase.cc" ]

添加解码代码

参考zxing/cli/src/main.cpp和工具类，在camera_sample.cpp文件里的FrameStateCallback的OnFrameFinished回调中进行二维码解码

cout << "Receive frame complete inform." << endl;
if (fc.GetFrameConfigType() == FRAME_CONFIG_CAPTURE) {
cout << "Capture frame received." << endl;
list<Surface *> surfaceList = fc.GetSurfaces();
for (Surface *surface : surfaceList) {
SurfaceBuffer *buffer = surface->AcquireBuffer();
if (buffer != nullptr) {
unsigned char *virtAddr = reinterpret_cast<unsigned char *>(buffer->GetVirAddr());
if (virtAddr != nullptr) {
cout << "start read_image...." << endl;
int width, height;
int comps = 0;
char *bufferImg = reinterpret_cast<char*>(jpgd::decompress_jpeg_image_from_memory(
virtAddr, buffer->GetSize(),&width, &height, &comps, 4));
cout << "Size:" << buffer->GetSize() <<" width:" << width<< " height:" << height<< " comps:" << comps << endl;
zxing::ArrayRef<char> image = zxing::ArrayRef<char>(bufferImg, 4*width * height);
free(bufferImg);
if (!image) {
ostringstream msg;
msg << "Loading jpeg_image_from_memory failed.";
throw zxing::IllegalArgumentException(msg.str().c_str());
}
Ref<LuminanceSource> source = Ref<LuminanceSource>(new ImageReaderSource(image, width, height, comps));
int res = read_image(source, true, "jpg");
cout << "end read_image...." << endl;
if(res == 0){
//扫码成功
}
}
surface->ReleaseBuffer(buffer);
}
delete surface;
}
}
delete &fc;

编译和运行

1、在/SambaShare/code-2.0-canary/applications/sample/camera/media目录下执行命令进行编译 hb build camera_lite

生成的文件在/SambaShare/code-2.0-canary/out/hispark_aries/ipcamera_hispark_aries/dev_tools/bin

找到camera_sample可执行文件并在开发板上运行

openharmony hi3518开发板实现扫码-鸿蒙开发者社区

2、选择1.captrue 或者自己写个方法如4.scancode进行图像抓取，抓取时将二维码图片放在摄像头前

如识别失败：

Receive frame complete inform.
Capture frame received.
start read_image....
Size:100393 width:1280 height:720 comps:3
cell_result:zxing::ReaderException: No code detected
end read_image....

如识别成功：

Receive frame complete inform.
Capture frame received.
start read_image....
Size:104433 width:1280 height:720 comps:3
cell_result:
result:::
https://u.wechat.com/EHLp4BGfLmfjtmCl6o-SPMg
end read_image....

遇到的问题

1、解码时可能会出现OOM，需要降低image的width，height

1）初始化相机时选择较低的width，height

const CameraAbility *ability = camKit->GetCameraAbility(cam);
/* find camera which fits user's ability */
list<CameraPicSize> sizeList = ability->GetSupportedSizes(0);
for (auto &pic : sizeList) {
cout << "pic.width: " << pic.width << endl;
cout << "pic.height: " << pic.height << endl;
if (pic.width == 1280 && pic.height == 720) {
camId = cam;
break;
}
}