二維碼Data Matrix的介紹見：?http://blog.csdn.net/fengbingchun/article/details/44279967? ，這里簡單寫了個生成二維碼和對二維碼進行識別的測試例子，如下：

int test_data_matrix_encode()
{std::string str = "中國_abc_DEF_123_@#$！HTTP://WWW.LIBDMTX.ORG";DmtxEncode* enc = dmtxEncodeCreate();assert(enc != NULL);int ret = dmtxEncodeDataMatrix(enc, strlen(str.c_str()), (unsigned char*)str.c_str());assert(ret == 1);int width = dmtxImageGetProp(enc->image, DmtxPropWidth);int height = dmtxImageGetProp(enc->image, DmtxPropHeight);int bytesPerPixel = dmtxImageGetProp(enc->image, DmtxPropBytesPerPixel);fprintf(stderr, "image width: %d, image height: %d, channels: %d\n", width, height, bytesPerPixel);assert(bytesPerPixel == 1 || bytesPerPixel == 3 || bytesPerPixel == 4);cv::Mat mat;if (bytesPerPixel == 1)mat = cv::Mat(height, width, CV_8UC1);else if (bytesPerPixel == 3)mat = cv::Mat(height, width, CV_8UC3);elsemat = cv::Mat(height, width, CV_8UC4);mat.data = enc->image->pxl;std::string image_name = "E:/GitCode/BarCode_Test/test_images/data_matrix_encode.jpg";cv::imwrite(image_name, mat);dmtxEncodeDestroy(&enc);return 0;
}int test_data_matrix_decode()
{std::string image_name = "E:/GitCode/BarCode_Test/test_images/data_matrix_encode.jpg";cv::Mat mat = cv::imread(image_name, 1);if (!mat.data) {fprintf(stderr, "read image error\n");return -1;}int width = mat.cols;int height = mat.rows;int channels = mat.channels();DmtxImage* img = dmtxImageCreate(mat.data, width, height, DmtxPack24bppRGB);if (!img) {fprintf(stderr, "dmtx image create fail\n");return -1;}DmtxDecode* dec = dmtxDecodeCreate(img, 1);if (!dec) {fprintf(stderr, "dmtx decode create fail\n");return -1;}DmtxRegion* reg = dmtxRegionFindNext(dec, nullptr);if (!reg) {fprintf(stderr, "dmtx region fail\n");return -1;}DmtxMessage* msg = dmtxDecodeMatrixRegion(dec, reg, DmtxUndefined);if (!msg) {fprintf(stderr, "dmtx decode matrix region fail\n");return -1;}std::string str(reinterpret_cast<char*>(msg->output));fprintf(stderr, "decode result: %s\n", str.c_str());dmtxMessageDestroy(&msg);dmtxRegionDestroy(&reg);dmtxDecodeDestroy(&dec);dmtxImageDestroy(&img);return 0;
}

其中test_data_matrix_encode函數(shù)用來生成二維碼，如下：

test_data_matrix_decode函數(shù)用來簡析上面生成的二維碼，執(zhí)行結(jié)果如下：

可看出，前后結(jié)果是一致的。

GitHub：https://github.com/fengbingchun/BarCode_Test

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