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hdf5/doc/html/cpplus_RM/writedata_8cpp-example.html
Frank Baker c17fb6fa1d [svn-r9028] 
Purpose:
    Adding C++ Reference Manual to 1.6 release branch.
    This manual is automatically generated
    by doxygen from the C++ source code.
Platforms tested:
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2004-08-05 16:22:19 -05:00

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<p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
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<!-- Generated by Doxygen 1.3.7-20040718 -->
<div class="qindex"><a class="qindex" href="index.html">Main&nbsp;Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class&nbsp;Hierarchy</a> | <a class="qindex" href="annotated.html">Class&nbsp;List</a> | <a class="qindex" href="files.html">File&nbsp;List</a> | <a class="qindex" href="functions.html">Class&nbsp;Members</a> | <a class="qindex" href="examples.html">Examples</a></div>
<h1>writedata.cpp</h1><dl compact><dt><b>Another example:</b></dt><dd>This example shows how to write datasets. <div class="fragment"><pre><span class="comment">/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *</span>
<span class="comment"> * Copyright by the Board of Trustees of the University of Illinois. *</span>
<span class="comment"> * All rights reserved. *</span>
<span class="comment"> * *</span>
<span class="comment"> * This file is part of HDF5. The full HDF5 copyright notice, including *</span>
<span class="comment"> * terms governing use, modification, and redistribution, is contained in *</span>
<span class="comment"> * the files COPYING and Copyright.html. COPYING can be found at the root *</span>
<span class="comment"> * of the source code distribution tree; Copyright.html can be found at the *</span>
<span class="comment"> * root level of an installed copy of the electronic HDF5 document set and *</span>
<span class="comment"> * is linked from the top-level documents page. It can also be found at *</span>
<span class="comment"> * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *</span>
<span class="comment"> * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *</span>
<span class="comment"> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */</span>
<span class="comment">/* </span>
<span class="comment"> * This program shows how the select_hyperslab and select_elements</span>
<span class="comment"> * functions are used to write selected data from memory to the file.</span>
<span class="comment"> * Program takes 48 elements from the linear buffer and writes them into</span>
<span class="comment"> * the matrix using 3x2 blocks, (4,3) stride and (2,4) count. </span>
<span class="comment"> * Then four elements of the matrix are overwritten with the new values and </span>
<span class="comment"> * file is closed. Program reopens the file and reads and displays the result.</span>
<span class="comment"> */</span>
<span class="preprocessor">#include &lt;string&gt;</span>
<span class="preprocessor">#ifdef OLD_HEADER_FILENAME</span>
<span class="preprocessor"></span><span class="preprocessor">#include &lt;iostream.h&gt;</span>
<span class="preprocessor">#else</span>
<span class="preprocessor"></span><span class="preprocessor">#include &lt;iostream&gt;</span>
<span class="preprocessor">#endif</span>
<span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="H5Cpp_8h.html">H5Cpp.h</a>"</span>
<span class="preprocessor">#ifndef H5_NO_NAMESPACE</span>
<span class="preprocessor"></span><span class="keyword">using</span> <span class="keyword">namespace </span>H5;
<span class="preprocessor">#endif</span>
<span class="preprocessor"></span>
<span class="keyword">const</span> string FILE_NAME( <span class="stringliteral">"Select.h5"</span> );
<span class="keyword">const</span> string DATASET_NAME( <span class="stringliteral">"Matrix in file"</span> );
<span class="keyword">const</span> <span class="keywordtype">int</span> MSPACE1_RANK = 1; <span class="comment">// Rank of the first dataset in memory</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> MSPACE1_DIM = 50; <span class="comment">// Dataset size in memory</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> MSPACE2_RANK = 1; <span class="comment">// Rank of the second dataset in memory</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> MSPACE2_DIM = 4; <span class="comment">// Dataset size in memory</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> FSPACE_RANK = 2; <span class="comment">// Dataset rank as it is stored in the file</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> FSPACE_DIM1 = 8; <span class="comment">// Dimension sizes of the dataset as it is...</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> FSPACE_DIM2 = 12; <span class="comment">// ...stored in the file </span>
<span class="keyword">const</span> <span class="keywordtype">int</span> MSPACE_DIM1 = 8; <span class="comment">// We will read dataset back from the file...</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> MSPACE_DIM2 = 12; <span class="comment">// ...to the dataset in memory with these ...</span>
<span class="comment">// ...dataspace parameters</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> NPOINTS = 4; <span class="comment">// Number of points that will be selected...</span>
<span class="comment">// ...and overwritten</span>
<span class="keywordtype">int</span> main (<span class="keywordtype">void</span>)
{
<span class="comment">/*</span>
<span class="comment"> * Buffers' initialization.</span>
<span class="comment"> */</span>
uint i,j;
<span class="keywordtype">int</span> vector[MSPACE1_DIM];
vector[0] = vector[MSPACE1_DIM - 1] = -1;
<span class="keywordflow">for</span> (i = 1; i &lt; MSPACE1_DIM - 1; i++)
vector[i] = i;
<span class="keywordtype">int</span> matrix[MSPACE_DIM1][MSPACE_DIM2];
<span class="keywordflow">for</span> (i = 0; i &lt; MSPACE_DIM1; i++)
{
<span class="keywordflow">for</span> (j = 0; j &lt; MSPACE_DIM2; j++)
matrix[i][j] = 0;
}
<span class="comment">// Try block to detect exceptions raised by any of the calls inside it</span>
<span class="keywordflow">try</span>
{
<span class="comment">/*</span>
<span class="comment"> * Turn off the auto-printing when failure occurs so that we can</span>
<span class="comment"> * handle the errors appropriately</span>
<span class="comment"> */</span>
Exception::dontPrint();
<span class="comment">/*</span>
<span class="comment"> * Create a file.</span>
<span class="comment"> */</span>
H5File* file = <span class="keyword">new</span> H5File( FILE_NAME, H5F_ACC_TRUNC );
<span class="comment">/*</span>
<span class="comment"> * Create dataspace for the dataset in the file.</span>
<span class="comment"> */</span>
hsize_t fdim[] = {FSPACE_DIM1, FSPACE_DIM2}; <span class="comment">// dim sizes of ds (on disk)</span>
DataSpace fspace( FSPACE_RANK, fdim );
<span class="comment">/*</span>
<span class="comment"> * Create dataset and write it into the file.</span>
<span class="comment"> */</span>
DataSet* dataset = <span class="keyword">new</span> DataSet(
file-&gt;createDataSet( DATASET_NAME, PredType::NATIVE_INT, fspace ));
dataset-&gt;write( matrix, PredType::NATIVE_INT );
<span class="comment">/*</span>
<span class="comment"> * Select hyperslab for the dataset in the file, using 3x2 blocks, </span>
<span class="comment"> * (4,3) stride and (2,4) count starting at the position (0,1).</span>
<span class="comment"> */</span>
hssize_t start[2]; <span class="comment">// Start of hyperslab</span>
hsize_t stride[2]; <span class="comment">// Stride of hyperslab</span>
hsize_t count[2]; <span class="comment">// Block count</span>
hsize_t block[2]; <span class="comment">// Block sizes</span>
start[0] = 0; start[1] = 1;
stride[0] = 4; stride[1] = 3;
count[0] = 2; count[1] = 4;
block[0] = 3; block[1] = 2;
fspace.selectHyperslab( H5S_SELECT_SET, count, start, stride, block);
<span class="comment">/*</span>
<span class="comment"> * Create dataspace for the first dataset.</span>
<span class="comment"> */</span>
hsize_t dim1[] = {MSPACE1_DIM}; <span class="comment">/* Dimension size of the first dataset </span>
<span class="comment"> (in memory) */</span>
DataSpace mspace1( MSPACE1_RANK, dim1 );
<span class="comment">/*</span>
<span class="comment"> * Select hyperslab. </span>
<span class="comment"> * We will use 48 elements of the vector buffer starting at the </span>
<span class="comment"> * second element. Selected elements are 1 2 3 . . . 48</span>
<span class="comment"> */</span>
start[0] = 1;
stride[0] = 1;
count[0] = 48;
block[0] = 1;
mspace1.selectHyperslab( H5S_SELECT_SET, count, start, stride, block);
<span class="comment">/*</span>
<span class="comment"> * Write selection from the vector buffer to the dataset in the file.</span>
<span class="comment"> *</span>
<span class="comment"> * File dataset should look like this: </span>
<span class="comment"> * 0 1 2 0 3 4 0 5 6 0 7 8 </span>
<span class="comment"> * 0 9 10 0 11 12 0 13 14 0 15 16</span>
<span class="comment"> * 0 17 18 0 19 20 0 21 22 0 23 24</span>
<span class="comment"> * 0 0 0 0 0 0 0 0 0 0 0 0</span>
<span class="comment"> * 0 25 26 0 27 28 0 29 30 0 31 32</span>
<span class="comment"> * 0 33 34 0 35 36 0 37 38 0 39 40</span>
<span class="comment"> * 0 41 42 0 43 44 0 45 46 0 47 48</span>
<span class="comment"> * 0 0 0 0 0 0 0 0 0 0 0 0</span>
<span class="comment"> */</span>
dataset-&gt;write( vector, PredType::NATIVE_INT, mspace1, fspace );
<span class="comment">/*</span>
<span class="comment"> * Reset the selection for the file dataspace fid.</span>
<span class="comment"> */</span>
fspace.selectNone();
<span class="comment">/*</span>
<span class="comment"> * Create dataspace for the second dataset.</span>
<span class="comment"> */</span>
hsize_t dim2[] = {MSPACE2_DIM}; <span class="comment">/* Dimension size of the second dataset</span>
<span class="comment"> (in memory */</span>
DataSpace mspace2( MSPACE2_RANK, dim2 );
<span class="comment">/*</span>
<span class="comment"> * Select sequence of NPOINTS points in the file dataspace.</span>
<span class="comment"> */</span>
hssize_t coord[NPOINTS][FSPACE_RANK]; <span class="comment">/* Array to store selected points </span>
<span class="comment"> from the file dataspace */</span>
coord[0][0] = 0; coord[0][1] = 0;
coord[1][0] = 3; coord[1][1] = 3;
coord[2][0] = 3; coord[2][1] = 5;
coord[3][0] = 5; coord[3][1] = 6;
fspace.selectElements( H5S_SELECT_SET, NPOINTS, (<span class="keyword">const</span> hssize_t **)coord);
<span class="comment">/*</span>
<span class="comment"> * Write new selection of points to the dataset.</span>
<span class="comment"> */</span>
<span class="keywordtype">int</span> values[] = {53, 59, 61, 67}; <span class="comment">/* New values to be written */</span>
dataset-&gt;write( values, PredType::NATIVE_INT, mspace2, fspace );
<span class="comment">/*</span>
<span class="comment"> * File dataset should look like this: </span>
<span class="comment"> * 53 1 2 0 3 4 0 5 6 0 7 8 </span>
<span class="comment"> * 0 9 10 0 11 12 0 13 14 0 15 16</span>
<span class="comment"> * 0 17 18 0 19 20 0 21 22 0 23 24</span>
<span class="comment"> * 0 0 0 59 0 61 0 0 0 0 0 0</span>
<span class="comment"> * 0 25 26 0 27 28 0 29 30 0 31 32</span>
<span class="comment"> * 0 33 34 0 35 36 67 37 38 0 39 40</span>
<span class="comment"> * 0 41 42 0 43 44 0 45 46 0 47 48</span>
<span class="comment"> * 0 0 0 0 0 0 0 0 0 0 0 0</span>
<span class="comment"> * </span>
<span class="comment"> */</span>
<span class="comment">/*</span>
<span class="comment"> * Close the dataset and the file.</span>
<span class="comment"> */</span>
<span class="keyword">delete</span> dataset;
<span class="keyword">delete</span> file;
<span class="comment">/*</span>
<span class="comment"> * Open the file.</span>
<span class="comment"> */</span>
file = <span class="keyword">new</span> H5File( FILE_NAME, H5F_ACC_RDONLY );
<span class="comment">/*</span>
<span class="comment"> * Open the dataset.</span>
<span class="comment"> */</span>
dataset = <span class="keyword">new</span> DataSet( file-&gt;openDataSet( DATASET_NAME ));
<span class="comment">/*</span>
<span class="comment"> * Read data back to the buffer matrix.</span>
<span class="comment"> */</span>
dataset-&gt;read( matrix, PredType::NATIVE_INT );
<span class="comment">/*</span>
<span class="comment"> * Display the result.</span>
<span class="comment"> */</span>
<span class="keywordflow">for</span> (i=0; i &lt; MSPACE_DIM1; i++)
{
<span class="keywordflow">for</span>(j=0; j &lt; MSPACE_DIM2; j++)
cout &lt;&lt; matrix[i][j] &lt;&lt; <span class="stringliteral">" "</span>;
cout &lt;&lt; endl;
}
<span class="comment">/*</span>
<span class="comment"> * Close the dataset and the file.</span>
<span class="comment"> */</span>
<span class="keyword">delete</span> dataset;
<span class="keyword">delete</span> file;
} <span class="comment">// end of try block</span>
<span class="comment">// catch failure caused by the H5File operations</span>
<span class="keywordflow">catch</span>( FileIException error )
{
error.printError();
<span class="keywordflow">return</span> -1;
}
<span class="comment">// catch failure caused by the DataSet operations</span>
<span class="keywordflow">catch</span>( DataSetIException error )
{
error.printError();
<span class="keywordflow">return</span> -1;
}
<span class="comment">// catch failure caused by the DataSpace operations</span>
<span class="keywordflow">catch</span>( DataSpaceIException error )
{
error.printError();
<span class="keywordflow">return</span> -1;
}
<span class="keywordflow">return</span> 0;
}
</pre></div> </dd></dl>
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