HDF5 - 用Hyperslab逐一写入/附加HDF5复合数据类型？

Question

我试图用C++ API将我的化合物数据类型逐个写入我的文件。我在Win64上使用HDF5-1.8.18。

我想写我的复合数据类型对象一个接一个。我有几种化合物类型，它们不会进入“堆叠式”缓冲区，它们只是一个接一个“到达”。当我尝试写入选定的Hyperslab时，我的代码失败。

我希望我的Hyperslab从数据集中一次只选择一个化合物数据类型的元素。在这个测试代码中，我总是希望写入索引3.显然，稍后我将从静态索引切换到计数器变量。

我的数据空间是一维的：

• 评级= 1
• 暗淡=数据对象的次数（例如：213）

我用写我的数据的代码：

H5::CompType compType = group->openCompType("tTestData"); 

H5::DataSpace fspace1 = dataset->getSpace(); 
hsize_t start[] = {3}; 
hsize_t stride[] = {1}; 
hsize_t count[] = {1}; 
hsize_t block[] = {1}; 

fspace1.selectHyperslab(H5S_SELECT_SET, count, start, stride, block); 
dataset->write(&myTestData, compType, fspace1); 

抛出的异常是：

HDF5-DIAG: Error detected in HDF5 (1.8.18) thread 0: 
    #000: ..\..\hdf5-1.8.18\src\H5Dio.c line 271 in H5Dwrite(): can't prepare for 
writing data 
    major: Dataset 
    minor: Write failed 
    #001: ..\..\hdf5-1.8.18\src\H5Dio.c line 352 in H5D__pre_write(): can't write 
data 
    major: Dataset 
    minor: Write failed 
    #002: ..\..\hdf5-1.8.18\src\H5Dio.c line 697 in H5D__write(): src and dest dat 
a spaces have different sizes 
    major: Invalid arguments to routine 
    minor: Bad value 

如何调整我的Hyperslab以便能够一次写入一个复合数据类型对象？似乎我需要调整我传递给selectHyperslab的变量，但我不确定要传递哪些参数？

Answer 1

我发现在此期间解决这一：

//h5 is a custom Adapter class, which allows me to reuse groups, datasets etc. 
//h5 also keeps track of the count of written data objects in a dataset (used below) 
//These functions are not included in HDF5. Just encapsulate the complexity of the HDF5 lib 
H5::Group* group = h5->GetGroupPtr(); 
H5::CompType compType = group->openCompType("someCompType");  
H5::DataSet* dataset = h5->GetDataSet("someDataSet"); 


//get dataspace of our dataset 
H5::DataSpace fspace1 = dataset->getSpace(); 

//define a 1x1 (one data row) dataspace 
hsize_t dim[] = {1}; 
H5::DataSpace space(1, dim); 

//get current data offset (index) and set stride, count, block to 1 
tInt64 currentCounter = h5->GetDataSetCounter("someDataSet"); 
hsize_t start[] = {currentCounter}; 
hsize_t stride[] = {1}; 
hsize_t count[] = {1}; 
hsize_t block[] = {1}; 

//select the 1x1 hyperslab 
fspace1.selectHyperslab(H5S_SELECT_SET, count, start, stride, block); 
dataset->write(&data, compType, space, fspace1); 

//clean up used resources 
fspace1.close(); 
space.close(); 

更多信息，请参见Hyperslab documentation。