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<div class="title">readdata.cpp</div> </div>
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<div class="contents">
<dl class="section user"><dt></dt><dd>This example shows how to read datasets.</dd></dl>
<div class="fragment"><div class="line"><span class="comment">/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *</span></div>
<div class="line"><span class="comment"> * Copyright by The HDF Group. *</span></div>
<div class="line"><span class="comment"> * Copyright by the Board of Trustees of the University of Illinois. *</span></div>
<div class="line"><span class="comment"> * All rights reserved. *</span></div>
<div class="line"><span class="comment"> * *</span></div>
<div class="line"><span class="comment"> * This file is part of HDF5. The full HDF5 copyright notice, including *</span></div>
<div class="line"><span class="comment"> * terms governing use, modification, and redistribution, is contained in *</span></div>
<div class="line"><span class="comment"> * the files COPYING and Copyright.html. COPYING can be found at the root *</span></div>
<div class="line"><span class="comment"> * of the source code distribution tree; Copyright.html can be found at the *</span></div>
<div class="line"><span class="comment"> * root level of an installed copy of the electronic HDF5 document set and *</span></div>
<div class="line"><span class="comment"> * is linked from the top-level documents page. It can also be found at *</span></div>
<div class="line"><span class="comment"> * http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *</span></div>
<div class="line"><span class="comment"> * access to either file, you may request a copy from help@hdfgroup.org. *</span></div>
<div class="line"><span class="comment"> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */</span></div>
<div class="line"></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This example reads hyperslab from the SDS.h5 file into</span></div>
<div class="line"><span class="comment">// two-dimensional plane of a three-dimensional array. Various</span></div>
<div class="line"><span class="comment">// information about the dataset in the SDS.h5 file is obtained.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#ifdef OLD_HEADER_FILENAME</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#include <iostream.h></span></div>
<div class="line"><span class="preprocessor">#else</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#include <iostream></span></div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#include <string></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#ifndef H5_NO_NAMESPACE</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#ifndef H5_NO_STD</span></div>
<div class="line"><span class="preprocessor"></span> <span class="keyword">using</span> std::cout;</div>
<div class="line"> <span class="keyword">using</span> std::endl;</div>
<div class="line"><span class="preprocessor">#endif // H5_NO_STD</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><span class="preprocessor"></span></div>
<div class="line"><span class="preprocessor">#include "H5Cpp.h"</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#ifndef H5_NO_NAMESPACE</span></div>
<div class="line"><span class="preprocessor"></span> <span class="keyword">using namespace </span>H5;</div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"><span class="preprocessor"></span></div>
<div class="line"><span class="keyword">const</span> H5std_string FILE_NAME( <span class="stringliteral">"SDS.h5"</span> );</div>
<div class="line"><span class="keyword">const</span> H5std_string DATASET_NAME( <span class="stringliteral">"IntArray"</span> );</div>
<div class="line"><span class="keyword">const</span> <span class="keywordtype">int</span> NX_SUB = 3; <span class="comment">// hyperslab dimensions</span></div>
<div class="line"><span class="keyword">const</span> <span class="keywordtype">int</span> NY_SUB = 4;</div>
<div class="line"><span class="keyword">const</span> <span class="keywordtype">int</span> NX = 7; <span class="comment">// output buffer dimensions</span></div>
<div class="line"><span class="keyword">const</span> <span class="keywordtype">int</span> NY = 7;</div>
<div class="line"><span class="keyword">const</span> <span class="keywordtype">int</span> NZ = 3;</div>
<div class="line"><span class="keyword">const</span> <span class="keywordtype">int</span> RANK_OUT = 3;</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> main (<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Output buffer initialization.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordtype">int</span> i, j, k;</div>
<div class="line"> <span class="keywordtype">int</span> data_out[NX][NY][NZ ]; <span class="comment">/* output buffer */</span></div>
<div class="line"> <span class="keywordflow">for</span> (j = 0; j < NX; j++)</div>
<div class="line"> {</div>
<div class="line"> <span class="keywordflow">for</span> (i = 0; i < NY; i++)</div>
<div class="line"> {</div>
<div class="line"> <span class="keywordflow">for</span> (k = 0; k < NZ ; k++)</div>
<div class="line"> data_out[j][i][k] = 0;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Try block to detect exceptions raised by any of the calls inside it</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">try</span></div>
<div class="line"> {</div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Turn off the auto-printing when failure occurs so that we can</span></div>
<div class="line"><span class="comment"> * handle the errors appropriately</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <a name="a0"></a><a class="code" href="class_h5_1_1_exception.html#ad49f16300979996c094c2e4f57868414">Exception::dontPrint</a>();</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Open the specified file and the specified dataset in the file.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <a name="_a1"></a><a class="code" href="class_h5_1_1_h5_file.html">H5File</a> file( FILE_NAME, H5F_ACC_RDONLY );</div>
<div class="line"> <a name="_a2"></a><a class="code" href="class_h5_1_1_data_set.html">DataSet</a> dataset = file.openDataSet( DATASET_NAME );</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Get the class of the datatype that is used by the dataset.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> H5T_class_t type_class = dataset.<a name="a3"></a><a class="code" href="class_h5_1_1_abstract_ds.html#ae7c9c2ca8092d6ec1e6f265b82775c96">getTypeClass</a>();</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Get class of datatype and print message if it's an integer.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span>( type_class == H5T_INTEGER )</div>
<div class="line"> {</div>
<div class="line"> cout << <span class="stringliteral">"Data set has INTEGER type"</span> << endl;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Get the integer datatype</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <a name="_a4"></a><a class="code" href="class_h5_1_1_int_type.html">IntType</a> intype = dataset.<a name="a5"></a><a class="code" href="class_h5_1_1_abstract_ds.html#a1c888cead693b57f08e2b42234d01f65">getIntType</a>();</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Get order of datatype and print message if it's a little endian.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> H5std_string order_string;</div>
<div class="line"> H5T_order_t order = intype.<a name="a6"></a><a class="code" href="class_h5_1_1_atom_type.html#a49a866fcb26c69b13735d52abf946515">getOrder</a>( order_string );</div>
<div class="line"> cout << order_string << endl;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Get size of the data element stored in file and print it.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordtype">size_t</span> size = intype.<a name="a7"></a><a class="code" href="class_h5_1_1_data_type.html#a9161a9e4c8a50aef002995294e28e6c5">getSize</a>();</div>
<div class="line"> cout << <span class="stringliteral">"Data size is "</span> << size << endl;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Get dataspace of the dataset.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <a name="_a8"></a><a class="code" href="class_h5_1_1_data_space.html">DataSpace</a> dataspace = dataset.<a name="a9"></a><a class="code" href="class_h5_1_1_data_set.html#a1f727ed91722af4630ba20b2d8b5b12d">getSpace</a>();</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Get the number of dimensions in the dataspace.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordtype">int</span> rank = dataspace.<a name="a10"></a><a class="code" href="class_h5_1_1_data_space.html#a8c7a590a67ef1a69fe6f70877761b55a">getSimpleExtentNdims</a>();</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Get the dimension size of each dimension in the dataspace and</span></div>
<div class="line"><span class="comment"> * display them.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> hsize_t dims_out[2];</div>
<div class="line"> <span class="keywordtype">int</span> ndims = dataspace.<a name="a11"></a><a class="code" href="class_h5_1_1_data_space.html#a704e01abf0484f976eef02589e1ee3fd">getSimpleExtentDims</a>( dims_out, NULL);</div>
<div class="line"> cout << <span class="stringliteral">"rank "</span> << rank << <span class="stringliteral">", dimensions "</span> <<</div>
<div class="line"> (<span class="keywordtype">unsigned</span> long)(dims_out[0]) << <span class="stringliteral">" x "</span> <<</div>
<div class="line"> (<span class="keywordtype">unsigned</span> long)(dims_out[1]) << endl;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Define hyperslab in the dataset; implicitly giving strike and</span></div>
<div class="line"><span class="comment"> * block NULL.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> hsize_t offset[2]; <span class="comment">// hyperslab offset in the file</span></div>
<div class="line"> hsize_t count[2]; <span class="comment">// size of the hyperslab in the file</span></div>
<div class="line"> offset[0] = 1;</div>
<div class="line"> offset[1] = 2;</div>
<div class="line"> count[0] = NX_SUB;</div>
<div class="line"> count[1] = NY_SUB;</div>
<div class="line"> dataspace.<a name="a12"></a><a class="code" href="class_h5_1_1_data_space.html#a92bd510d1c06ebef292faeff73f40c12">selectHyperslab</a>( H5S_SELECT_SET, count, offset );</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Define the memory dataspace.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> hsize_t dimsm[3]; <span class="comment">/* memory space dimensions */</span></div>
<div class="line"> dimsm[0] = NX;</div>
<div class="line"> dimsm[1] = NY;</div>
<div class="line"> dimsm[2] = NZ ;</div>
<div class="line"> <a class="code" href="class_h5_1_1_data_space.html">DataSpace</a> memspace( RANK_OUT, dimsm );</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Define memory hyperslab.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> hsize_t offset_out[3]; <span class="comment">// hyperslab offset in memory</span></div>
<div class="line"> hsize_t count_out[3]; <span class="comment">// size of the hyperslab in memory</span></div>
<div class="line"> offset_out[0] = 3;</div>
<div class="line"> offset_out[1] = 0;</div>
<div class="line"> offset_out[2] = 0;</div>
<div class="line"> count_out[0] = NX_SUB;</div>
<div class="line"> count_out[1] = NY_SUB;</div>
<div class="line"> count_out[2] = 1;</div>
<div class="line"> memspace.selectHyperslab( H5S_SELECT_SET, count_out, offset_out );</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Read data from hyperslab in the file into the hyperslab in</span></div>
<div class="line"><span class="comment"> * memory and display the data.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> dataset.<a name="a13"></a><a class="code" href="class_h5_1_1_data_set.html#a2f0278a519122419ae9981666277c9bb">read</a>( data_out, <a name="a14"></a><a class="code" href="class_h5_1_1_pred_type.html#a3308bcd537696a8d728cd3b443f2fc7b">PredType::NATIVE_INT</a>, memspace, dataspace );</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> (j = 0; j < NX; j++)</div>
<div class="line"> {</div>
<div class="line"> <span class="keywordflow">for</span> (i = 0; i < NY; i++)</div>
<div class="line"> cout << data_out[j][i][0] << <span class="stringliteral">" "</span>;</div>
<div class="line"> cout << endl;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * 0 0 0 0 0 0 0</span></div>
<div class="line"><span class="comment"> * 0 0 0 0 0 0 0</span></div>
<div class="line"><span class="comment"> * 0 0 0 0 0 0 0</span></div>
<div class="line"><span class="comment"> * 3 4 5 6 0 0 0</span></div>
<div class="line"><span class="comment"> * 4 5 6 7 0 0 0</span></div>
<div class="line"><span class="comment"> * 5 6 7 8 0 0 0</span></div>
<div class="line"><span class="comment"> * 0 0 0 0 0 0 0</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> } <span class="comment">// end of try block</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">// catch failure caused by the H5File operations</span></div>
<div class="line"> <span class="keywordflow">catch</span>( <a name="_a15"></a><a class="code" href="class_h5_1_1_file_i_exception.html">FileIException</a> error )</div>
<div class="line"> {</div>
<div class="line"> error.<a name="a16"></a><a class="code" href="class_h5_1_1_exception.html#ad5bf0f93b4156d6366110dd5e08342a2">printError</a>();</div>
<div class="line"> <span class="keywordflow">return</span> -1;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// catch failure caused by the DataSet operations</span></div>
<div class="line"> <span class="keywordflow">catch</span>( <a name="_a17"></a><a class="code" href="class_h5_1_1_data_set_i_exception.html">DataSetIException</a> error )</div>
<div class="line"> {</div>
<div class="line"> error.<a class="code" href="class_h5_1_1_exception.html#ad5bf0f93b4156d6366110dd5e08342a2">printError</a>();</div>
<div class="line"> <span class="keywordflow">return</span> -1;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// catch failure caused by the DataSpace operations</span></div>
<div class="line"> <span class="keywordflow">catch</span>( <a name="_a18"></a><a class="code" href="class_h5_1_1_data_space_i_exception.html">DataSpaceIException</a> error )</div>
<div class="line"> {</div>
<div class="line"> error.<a class="code" href="class_h5_1_1_exception.html#ad5bf0f93b4156d6366110dd5e08342a2">printError</a>();</div>
<div class="line"> <span class="keywordflow">return</span> -1;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// catch failure caused by the DataSpace operations</span></div>
<div class="line"> <span class="keywordflow">catch</span>( <a name="_a19"></a><a class="code" href="class_h5_1_1_data_type_i_exception.html">DataTypeIException</a> error )</div>
<div class="line"> {</div>
<div class="line"> error.<a class="code" href="class_h5_1_1_exception.html#ad5bf0f93b4156d6366110dd5e08342a2">printError</a>();</div>
<div class="line"> <span class="keywordflow">return</span> -1;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0; <span class="comment">// successfully terminated</span></div>
<div class="line">}</div>
<div class="line"></div>
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