您好,这是我第一次使用 HDF5,我正在尝试使用手动创建的数据集创建数据库表。该文件已创建并已部署,但是每次我尝试插入单个数据注册表时(每次 1x6 的 cv::mat ,因为我尝试插入整个数据集,但我也无法插入),我收到以下消息:
H5Dwrite():文件选择+偏移量不在范围内 专业:数据空间 次要:超出范围 抛出“H5::DataSetIException”实例后调用终止
我使用的代码如下
cv::Mat label;
int size = data.length()/n_features_objects;
size_t size_[2]={1,(hsize_t)n_features_objects};
hsize_t chunk[2]={1,(hsize_t)n_features_objects};
hsize_t max_size[2]={H5S_UNLIMITED,(hsize_t)n_features_objects};
H5::DSetCreatPropList prop;
prop.setChunk(2,chunk);
H5::DataSpace ds(2, size_,max_size);
H5::IntType datatype = H5::PredType::NATIVE_UINT64;
objects = labelFile.createDataSet(objects_name.toStdString(),datatype, ds,prop);
//get size of the dataset
H5::DataSpace ds = objects.getSpace();
int dims = ds.getSimpleExtentNdims();
hsize_t rc [dims];
ds.getSimpleExtentDims(rc);
int rows = (int)rc[0];
for(int z=0; z<size;z++)
{
hsize_t new_size[2]={1, (hsize_t)n_features_objects};
labels.extend(new_size);
cv::Mat label_oreg = cv::Mat::zeros(cv::Size(n_features_objects,1), CV_32SC1);
//Adding data registries one by one
label_oreg.at<int>(0,0) = label_oreg.at<int>(z,0);
label_oreg.at<int>(0,1) = label_oreg.at<int>(z,1);
label_oreg.at<int>(0,2) = label_oreg.at<int>(z,2);
label_oreg.at<int>(0,3) = label_oreg.at<int>(z,3);
label_oreg.at<int>(0,4) = label_oreg.at<int>(z,4);
label_oreg.at<int>(0,5) = label_oreg.at<int>(z,5);
hsize_t rows_ext[2] ={1, (hsize_t)n_features_objects};
hsize_t offset[2] ={(hsize_t)1, 0};
ds = labels.getSpace();
ds.selectHyperslab(H5S_SELECT_SET,rows_ext, offset);
H5::DataSpace mem_space(2, rows_ext);
labels.write(label.data, H5::PredType::NATIVE_INT32, mem_space, ds);
}
有人知道我在这里缺少什么吗?我认为结果很奇怪,因为我总是在数据空间中注册一个新的数据块,以便将其用于放置注册表。
根据您的问题的标题和描述,您似乎希望将数据添加(即追加)到 HDF5 数据集中而不覆盖现有数据,就像表(在关系数据库中)允许您添加行而无需覆盖现有数据一样。覆盖现有的。
如果这是正确的,这里有一个通用示例,说明如何在 C++ 中使用 HDFql 来完成此操作(我不知道如何在其他 HDF5 C++ API 中执行此操作):
// declare variable
unsigned long long values[6];
// create HDF5 file "my_file.h5" and use (i.e. open) it
HDFql::execute("CREATE AND USE FILE my_file.h5");
// create HDF5 dataset "my_dataset" of datatype unsigned long long (64 bit) of two dimensions (unlimited x 6)
HDFql::execute("CREATE CHUNKED(1, 6) DATASET my_dataset AS UNSIGNED BIGINT(0 TO UNLIMITED, 6)");
// register variable "values" for subsequent use (by HDFql)
HDFql::variableRegister(values);
// keep reading data (from hypothetical function "read") and store it in variable "values" until there is no more to read
while(read(values))
{
// extend first dimension of dataset "my_dataset" one unit
HDFql::execute("ALTER DIMENSION my_dataset TO +1");
// insert (i.e. write) content of variable "values" into the last position of the first dimension of dataset "my_dataset" (thanks to a hyperslab selection)
HDFql::execute("INSERT INTO my_dataset[-1:1:1:1] VALUES FROM MEMORY 0");
}
// unregister variable "values" as it is no longer used/needed (by HDFql)
HDFql::variableUnregister(values);