C++ DSetMemXferPropList::setBuffer方法代码示例

/*-------------------------------------------------------------------------
 * Function:	test_compression
 *
 * Purpose:	Tests dataset compression. If compression is requested when
 *		it hasn't been compiled into the library (such as when
 *		updating an existing compressed dataset) then data is sent to
 *		the file uncompressed but no errors are returned.
 *
 * Return:	Success:	0
 *
 *		Failure:	-1
 *
 * Programmer:	Binh-Minh Ribler (using C version)
 *		Friday, January 5, 2001
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_compression(H5File& file)
{
#ifndef H5_HAVE_FILTER_DEFLATE
    const char		*not_supported;
    not_supported = "    Deflate compression is not enabled.";
#endif /* H5_HAVE_FILTER_DEFLATE */
    int		points[100][200];
    int		check[100][200];
    hsize_t	i, j, n;

    // Initialize the dataset
    for (i = n = 0; i < 100; i++)
    {
	for (j = 0; j < 200; j++) {
	    points[i][j] = (int)n++;
	}
    }
    char* tconv_buf = new char [1000];
    DataSet* dataset = NULL;
    try
    {
	const hsize_t	size[2] = {100, 200};
	// Create the data space
	DataSpace space1(2, size, NULL);

	// Create a small conversion buffer to test strip mining
	DSetMemXferPropList xfer;

	xfer.setBuffer (1000, tconv_buf, NULL);

	// Use chunked storage with compression
	DSetCreatPropList dscreatplist;

	const hsize_t	chunk_size[2] = {2, 25};
	dscreatplist.setChunk (2, chunk_size);
	dscreatplist.setDeflate (6);

#ifdef H5_HAVE_FILTER_DEFLATE
	SUBTEST("Compression (setup)");

	// Create the dataset
	dataset = new DataSet (file.createDataSet
	    (DSET_COMPRESS_NAME, PredType::NATIVE_INT, space1, dscreatplist));

	PASSED();

	/*----------------------------------------------------------------------
	* STEP 1: Read uninitialized data.  It should be zero.
	*----------------------------------------------------------------------
	*/
	SUBTEST("Compression (uninitialized read)");

	dataset->read ((void*) check, PredType::NATIVE_INT, DataSpace::ALL, DataSpace::ALL, xfer);

	for (i=0; i<size[0]; i++) {
	    for (j=0; j<size[1]; j++) {
		if (0!=check[i][j]) {
		    H5_FAILED();
		    cerr << "    Read a non-zero value." << endl;
		    cerr << "    At index " << (unsigned long)i << "," <<
		   (unsigned long)j << endl;
		    throw Exception("test_compression", "Failed in uninitialized read");
		}
	    }
	}
	PASSED();

	/*----------------------------------------------------------------------
	* STEP 2: Test compression by setting up a chunked dataset and writing
	* to it.
	*----------------------------------------------------------------------
	*/
	SUBTEST("Compression (write)");

	for (i=n=0; i<size[0]; i++)
	{
	    for (j=0; j<size[1]; j++)
	    {
		points[i][j] = (int)n++;
	    }
//.........这里部分代码省略.........

/*-------------------------------------------------------------------------
 * Function:	test_simple_io
 *
 * Purpose:	Tests simple I/O.  That is, reading and writing a complete
 *		multi-dimensional array without data type or data space
 *		conversions, without compression, and stored contiguously.
 *
 * Return:	Success:	0
 *
 *		Failure:	-1
 *
 * Programmer:	Binh-Minh Ribler (using C version)
 *		Friday, January 5, 2001
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_simple_io( H5File& file)
{

    SUBTEST("simple I/O");

    int	points[100][200];
    int	check[100][200];
    int		i, j, n;

    // Initialize the dataset
    for (i = n = 0; i < 100; i++)
    {
	for (j = 0; j < 200; j++) {
	    points[i][j] = n++;
	}
    }

    char* tconv_buf = new char [1000];
    try
    {
	// Create the data space
	hsize_t	dims[2];
	dims[0] = 100;
	dims[1] = 200;
	DataSpace space (2, dims, NULL);

	// Create a small conversion buffer to test strip mining
	DSetMemXferPropList xfer;

	xfer.setBuffer (1000, tconv_buf, NULL);

	// Create the dataset
	DataSet dataset (file.createDataSet (DSET_SIMPLE_IO_NAME, PredType::NATIVE_INT, space));

	// Write the data to the dataset
	dataset.write ((void*) points, PredType::NATIVE_INT, DataSpace::ALL, DataSpace::ALL, xfer);

	// Read the dataset back
	dataset.read ((void*) check, PredType::NATIVE_INT, DataSpace::ALL, DataSpace::ALL, xfer);

	// Check that the values read are the same as the values written
	for (i = 0; i < 100; i++)
	    for (j = 0; j < 200; j++)
	    {
		int status = check_values (i, j, points[i][j], check[i][j]);
		if (status == -1)
		    throw Exception("DataSet::read");
	    }

	// clean up and return with success
	delete [] tconv_buf;
	PASSED();
	return 0;
    }  // end try

    // catch all dataset, space, plist exceptions
    catch (Exception E)
    {
	cerr << " FAILED" << endl;
	cerr << "    <<<  " << E.getDetailMsg() << "  >>>" << endl << endl;

	// clean up and return with failure
	if (tconv_buf)
	    delete [] tconv_buf;
	return -1;
    }
}   // test_simple_io