diff options
Diffstat (limited to 'c++')
| -rw-r--r-- | c++/examples/chunks.cpp | 379 | ||||
| -rw-r--r-- | c++/examples/compound.cpp | 28 | ||||
| -rw-r--r-- | c++/examples/h5group.cpp | 333 | ||||
| -rw-r--r-- | c++/examples/writedata.cpp | 454 |
4 files changed, 642 insertions, 552 deletions
diff --git a/c++/examples/chunks.cpp b/c++/examples/chunks.cpp index 783fffa..471acea 100644 --- a/c++/examples/chunks.cpp +++ b/c++/examples/chunks.cpp @@ -14,7 +14,7 @@ /* * This example shows how to read data from a chunked dataset. - * We will read from the file created by extend.C + * We will read from the file created by extend.cpp */ #ifdef OLD_HEADER_FILENAME @@ -46,191 +46,194 @@ const int RANKC = 1; int main (void) { - hsize_t i, j; - - // Try block to detect exceptions raised by any of the calls inside it - try - { - /* - * Turn off the auto-printing when failure occurs so that we can - * handle the errors appropriately - */ - Exception::dontPrint(); - - /* - * Open the file and the dataset. - */ - H5File file( FILE_NAME, H5F_ACC_RDONLY ); - DataSet dataset = file.openDataSet( DATASET_NAME ); - - /* - * Get filespace for rank and dimension - */ - DataSpace filespace = dataset.getSpace(); - - /* - * Get number of dimensions in the file dataspace - */ - int rank = filespace.getSimpleExtentNdims(); - - /* - * Get and print the dimension sizes of the file dataspace - */ - hsize_t dims[2]; // dataset dimensions - rank = filespace.getSimpleExtentDims( dims ); - cout << "dataset rank = " << rank << ", dimensions " - << (unsigned long)(dims[0]) << " x " << (unsigned long)(dims[1]) - << endl; - - /* - * Get creation properties list. - */ - DSetCreatPropList cparms = dataset.getCreatePlist(); - - /* - * Check if dataset is chunked. - */ - hsize_t chunk_dims[2]; - int rank_chunk; - if( H5D_CHUNKED == cparms.getLayout() ) - { - /* - * Get chunking information: rank and dimensions - */ - rank_chunk = cparms.getChunk( 2, chunk_dims); - cout << "chunk rank " << rank_chunk << "dimensions " - << (unsigned long)(chunk_dims[0]) << " x " - << (unsigned long)(chunk_dims[1]) << endl; - } - - /* - * Define the memory space to read dataset. - */ - DataSpace mspace1( RANK, dims ); - - /* - * Read dataset back and display. - */ - int data_out[NX][NY]; // buffer for dataset to be read - dataset.read( data_out, PredType::NATIVE_INT, mspace1, filespace ); - cout << "\n"; - cout << "Dataset: \n"; - for (j = 0; j < dims[0]; j++) - { - for (i = 0; i < dims[1]; i++) - cout << data_out[j][i] << " "; - cout << endl; - } - - /* - * dataset rank 2, dimensions 10 x 5 - * chunk rank 2, dimensions 2 x 5 - - * Dataset: - * 1 1 1 3 3 - * 1 1 1 3 3 - * 1 1 1 0 0 - * 2 0 0 0 0 - * 2 0 0 0 0 - * 2 0 0 0 0 - * 2 0 0 0 0 - * 2 0 0 0 0 - * 2 0 0 0 0 - * 2 0 0 0 0 - */ - - /* - * Read the third column from the dataset. - * First define memory dataspace, then define hyperslab - * and read it into column array. - */ - hsize_t col_dims[1]; - col_dims[0] = 10; - DataSpace mspace2( RANKC, col_dims ); - - /* - * Define the column (hyperslab) to read. - */ - hsize_t offset[2] = { 0, 2 }; - hsize_t count[2] = { 10, 1 }; - int column[10]; // buffer for column to be read - - filespace.selectHyperslab( H5S_SELECT_SET, count, offset ); - dataset.read( column, PredType::NATIVE_INT, mspace2, filespace ); - - cout << endl; - cout << "Third column: " << endl; - for (i = 0; i < 10; i++) - cout << column[i] << endl; - - /* - * Third column: - * 1 - * 1 - * 1 - * 0 - * 0 - * 0 - * 0 - * 0 - * 0 - * 0 - */ - - /* - * Define the memory space to read a chunk. - */ - DataSpace mspace3( rank_chunk, chunk_dims ); - - /* - * Define chunk in the file (hyperslab) to read. - */ - offset[0] = 2; - offset[1] = 0; - count[0] = chunk_dims[0]; - count[1] = chunk_dims[1]; - filespace.selectHyperslab( H5S_SELECT_SET, count, offset ); - - /* - * Read chunk back and display. - */ - int chunk_out[2][5]; // buffer for chunk to be read - dataset.read( chunk_out, PredType::NATIVE_INT, mspace3, filespace ); - cout << endl; - cout << "Chunk:" << endl; - for (j = 0; j < chunk_dims[0]; j++) - { - for (i = 0; i < chunk_dims[1]; i++) - cout << chunk_out[j][i] << " "; - cout << endl; - } - /* - * Chunk: - * 1 1 1 0 0 - * 2 0 0 0 0 - */ - } // end of try block - - // catch failure caused by the H5File operations - catch( FileIException error ) - { - error.printError(); - return -1; - } - - // catch failure caused by the DataSet operations - catch( DataSetIException error ) - { - error.printError(); - return -1; - } - - // catch failure caused by the DataSpace operations - catch( DataSpaceIException error ) - { - error.printError(); - return -1; - } - - return 0; + hsize_t i, j; + + // Try block to detect exceptions raised by any of the calls inside it + try + { + /* + * Turn off the auto-printing when failure occurs so that we can + * handle the errors appropriately + */ + Exception::dontPrint(); + + /* + * Open the file and the dataset. + */ + H5File file( FILE_NAME, H5F_ACC_RDONLY ); + DataSet dataset = file.openDataSet( DATASET_NAME ); + + /* + * Get filespace for rank and dimension + */ + DataSpace filespace = dataset.getSpace(); + + /* + * Get number of dimensions in the file dataspace + */ + int rank = filespace.getSimpleExtentNdims(); + + /* + * Get and print the dimension sizes of the file dataspace + */ + hsize_t dims[2]; // dataset dimensions + rank = filespace.getSimpleExtentDims( dims ); + cout << "dataset rank = " << rank << ", dimensions " + << (unsigned long)(dims[0]) << " x " + << (unsigned long)(dims[1]) << endl; + + /* + * Define the memory space to read dataset. + */ + DataSpace mspace1(RANK, dims); + + /* + * Read dataset back and display. + */ + int data_out[NX][NY]; // buffer for dataset to be read + dataset.read( data_out, PredType::NATIVE_INT, mspace1, filespace ); + + cout << "\n"; + cout << "Dataset: \n"; + for (j = 0; j < dims[0]; j++) + { + for (i = 0; i < dims[1]; i++) + cout << data_out[j][i] << " "; + cout << endl; + } + + /* + * dataset rank 2, dimensions 10 x 5 + * chunk rank 2, dimensions 2 x 5 + + * Dataset: + * 1 1 1 3 3 + * 1 1 1 3 3 + * 1 1 1 0 0 + * 2 0 0 0 0 + * 2 0 0 0 0 + * 2 0 0 0 0 + * 2 0 0 0 0 + * 2 0 0 0 0 + * 2 0 0 0 0 + * 2 0 0 0 0 + */ + + /* + * Read the third column from the dataset. + * First define memory dataspace, then define hyperslab + * and read it into column array. + */ + hsize_t col_dims[1]; + col_dims[0] = 10; + DataSpace mspace2( RANKC, col_dims ); + + /* + * Define the column (hyperslab) to read. + */ + hsize_t offset[2] = { 0, 2 }; + hsize_t count[2] = { 10, 1 }; + int column[10]; // buffer for column to be read + + /* + * Define hyperslab and read. + */ + filespace.selectHyperslab( H5S_SELECT_SET, count, offset ); + dataset.read( column, PredType::NATIVE_INT, mspace2, filespace ); + + cout << endl; + cout << "Third column: " << endl; + for (i = 0; i < 10; i++) + cout << column[i] << endl; + + /* + * Third column: + * 1 + * 1 + * 1 + * 0 + * 0 + * 0 + * 0 + * 0 + * 0 + * 0 + */ + + /* + * Get creation properties list. + */ + DSetCreatPropList cparms = dataset.getCreatePlist(); + + /* + * Check if dataset is chunked. + */ + hsize_t chunk_dims[2]; + int rank_chunk; + if( H5D_CHUNKED == cparms.getLayout() ) + { + /* + * Get chunking information: rank and dimensions + */ + rank_chunk = cparms.getChunk( 2, chunk_dims); + cout << "chunk rank " << rank_chunk << "dimensions " + << (unsigned long)(chunk_dims[0]) << " x " + << (unsigned long)(chunk_dims[1]) << endl; + + /* + * Define the memory space to read a chunk. + */ + DataSpace mspace3( rank_chunk, chunk_dims ); + + /* + * Define chunk in the file (hyperslab) to read. + */ + offset[0] = 2; + offset[1] = 0; + count[0] = chunk_dims[0]; + count[1] = chunk_dims[1]; + filespace.selectHyperslab( H5S_SELECT_SET, count, offset ); + + /* + * Read chunk back and display. + */ + int chunk_out[2][5]; // buffer for chunk to be read + dataset.read( chunk_out, PredType::NATIVE_INT, mspace3, filespace ); + cout << endl; + cout << "Chunk:" << endl; + for (j = 0; j < chunk_dims[0]; j++) + { + for (i = 0; i < chunk_dims[1]; i++) + cout << chunk_out[j][i] << " "; + cout << endl; + } + /* + * Chunk: + * 1 1 1 0 0 + * 2 0 0 0 0 + */ + } + } // end of try block + + // catch failure caused by the H5File operations + catch( FileIException error ) + { + error.printError(); + return -1; + } + + // catch failure caused by the DataSet operations + catch( DataSetIException error ) + { + error.printError(); + return -1; + } + + // catch failure caused by the DataSpace operations + catch( DataSpaceIException error ) + { + error.printError(); + return -1; + } + return 0; } diff --git a/c++/examples/compound.cpp b/c++/examples/compound.cpp index de48590..0424ef3 100644 --- a/c++/examples/compound.cpp +++ b/c++/examples/compound.cpp @@ -50,7 +50,7 @@ int main(void) { /* First structure and dataset*/ typedef struct s1_t { - int a; + int a; float b; double c; } s1_t; @@ -58,7 +58,7 @@ int main(void) /* Second structure (subset of s1_t) and dataset*/ typedef struct s2_t { double c; - int a; + int a; } s2_t; // Try block to detect exceptions raised by any of the calls inside it @@ -67,8 +67,8 @@ int main(void) /* * Initialize the data */ - int i; - s1_t s1[LENGTH]; + int i; + s1_t s1[LENGTH]; for (i = 0; i< LENGTH; i++) { s1[i].a = i; @@ -85,7 +85,7 @@ int main(void) /* * Create the data space. */ - hsize_t dim[] = {LENGTH}; /* Dataspace dimensions */ + hsize_t dim[] = {LENGTH}; /* Dataspace dimensions */ DataSpace space( RANK, dim ); /* @@ -105,10 +105,10 @@ int main(void) * Create the dataset. */ DataSet* dataset; - dataset = new DataSet( file->createDataSet( DATASET_NAME, mtype1, space )); + dataset = new DataSet(file->createDataSet(DATASET_NAME, mtype1, space)); /* - * Wtite data to the dataset; + * Write data to the dataset; */ dataset->write( s1, mtype1 ); @@ -118,16 +118,6 @@ int main(void) delete dataset; delete file; - // Get the class of the first member in mtype1, then get its type - H5T_class_t member1_class = mtype1.getMemberClass( 2 ); - if( member1_class == H5T_FLOAT ) - { - FloatType member2 = mtype1.getMemberFloatType( 2 ); - H5std_string norm_string; - H5T_norm_t norm = member2.getNorm( norm_string ); - cout << "Normalization type is " << norm_string << endl; - } - /* * Open the file and the dataset. */ @@ -146,7 +136,7 @@ int main(void) * Read two fields c and a from s1 dataset. Fields in the file * are found by their names "c_name" and "a_name". */ - s2_t s2[LENGTH]; + s2_t s2[LENGTH]; dataset->read( s2, mtype2 ); /* @@ -172,7 +162,7 @@ int main(void) /* * Read field b from s1 dataset. Field in the file is found by its name. */ - float s3[LENGTH]; // Third "structure" - used to read float field of s1) + float s3[LENGTH]; // Third "structure" - used to read float field of s1 dataset->read( s3, mtype3 ); /* diff --git a/c++/examples/h5group.cpp b/c++/examples/h5group.cpp index 02e3961..d4efdd6 100644 --- a/c++/examples/h5group.cpp +++ b/c++/examples/h5group.cpp @@ -1,7 +1,7 @@ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * - * Copyright by the Board of Trustees of the University of Illinois. * - * All rights reserved. * - * * + * Copyright by the Board of Trustees of the University of Illinois. * + * All rights reserved. * + * * * This file is part of HDF5. The full HDF5 copyright notice, including * * terms governing use, modification, and redistribution, is contained in * * the files COPYING and Copyright.html. COPYING can be found at the root * @@ -41,8 +41,8 @@ using namespace H5; #endif -const H5std_string FILE_NAME( "Group.h5" ); -const int RANK = 2; +const H5std_string FILE_NAME( "Group.h5" ); +const int RANK = 2; // Operator function extern "C" herr_t file_info(hid_t loc_id, const char *name, void *opdata); @@ -53,159 +53,174 @@ int main(void) hsize_t dims[2]; hsize_t cdims[2]; - // Try block to detect exceptions raised by any of the calls inside it - try - { - /* - * Turn off the auto-printing when failure occurs so that we can - * handle the errors appropriately - */ - Exception::dontPrint(); - - /* - * Create the named file, truncating the existing one if any, - * using default create and access property lists. - */ - H5File *file = new H5File( FILE_NAME, H5F_ACC_TRUNC ); - - /* - * Create a group in the file - */ - Group* group = new Group( file->createGroup( "/Data" )); - - /* - * Create dataset "Compressed Data" in the group using absolute - * name. Dataset creation property list is modified to use - * GZIP compression with the compression effort set to 6. - * Note that compression can be used only when dataset is chunked. - */ - dims[0] = 1000; - dims[1] = 20; - cdims[0] = 20; - cdims[1] = 20; - DataSpace dataspace( RANK, dims ); // create the new dataspace - // for the dataset - - DSetCreatPropList ds_creatplist; // create dataset creation prop list - ds_creatplist.setChunk( 2, cdims ); // then modify it for compression - ds_creatplist.setDeflate( 6 ); - - DataSet* dataset = new DataSet( file->createDataSet( "/Data/Compressed_Data", PredType::NATIVE_INT, dataspace, ds_creatplist )); - - /* - * Close the dataset and the file. - */ - delete dataset; - delete group; - delete file; - - /* - * Now reopen the file and group in the file. - */ - file = new H5File( FILE_NAME, H5F_ACC_RDWR ); - group = new Group( file->openGroup( "Data" )); - - /* - * Access "Compressed_Data" dataset in the group. - */ - try { // to determine if the dataset exists in the group - dataset = new DataSet( group->openDataSet( "Compressed_Data" )); - } - catch( GroupIException not_found_error ) - { - cout << " Dataset is not found." << endl; - } - cout << "dataset \"/Data/Compressed_Data\" is open" << endl; - - /* - * Close the dataset. - */ - delete dataset; - - /* - * Create hard link to the Data group. - */ - file->link( H5G_LINK_HARD, "Data", "Data_new" ); - - /* - * We can access "Compressed_Data" dataset using created - * hard link "Data_new". - */ - try { // to determine if the dataset exists in the file - dataset = new DataSet( file->openDataSet( "/Data_new/Compressed_Data" )); - } - catch( FileIException not_found_error ) - { - cout << " Dataset is not found." << endl; - } - cout << "dataset \"/Data_new/Compressed_Data\" is open" << endl; - - /* - * Close the dataset. - */ - delete dataset; - - /* - * Use iterator to see the names of the objects in the file - * root directory. - */ - cout << endl << "Iterating over elements in the file" << endl; - herr_t idx = H5Giterate(file->getId(), "/", NULL, file_info, NULL); - cout << endl; - - /* - * Unlink name "Data" and use iterator to see the names - * of the objects in the file root direvtory. - */ - cout << "Unlinking..." << endl; - try { // attempt to unlink the dataset - file->unlink( "Data" ); - } - catch( FileIException unlink_error ) - { - cout << " unlink failed." << endl; - } - cout << "\"Data\" is unlinked" << endl; - - cout << endl << "Iterating over elements in the file again" << endl; - idx = H5Giterate(file->getId(), "/", NULL, file_info, NULL); - cout << endl; - - /* - * Close the file. - */ - delete file; - - } // end of try block - - // catch failure caused by the H5File operations - catch( FileIException error ) - { - error.printError(); - return -1; - } - - // catch failure caused by the DataSet operations - catch( DataSetIException error ) - { - error.printError(); - return -1; - } - - // catch failure caused by the DataSpace operations - catch( DataSpaceIException error ) - { - error.printError(); - return -1; - } - - // catch failure caused by the Attribute operations - catch( AttributeIException error ) - { - error.printError(); - return -1; - } - return 0; + // Try block to detect exceptions raised by any of the calls inside it + try + { + /* + * Turn off the auto-printing when failure occurs so that we can + * handle the errors appropriately + */ + Exception::dontPrint(); + + /* + * Create the named file, truncating the existing one if any, + * using default create and access property lists. + */ + H5File *file = new H5File( FILE_NAME, H5F_ACC_TRUNC ); + + /* + * Create a group in the file + */ + Group* group = new Group( file->createGroup( "/Data" )); + + /* + * Create dataset "Compressed Data" in the group using absolute + * name. Dataset creation property list is modified to use + * GZIP compression with the compression effort set to 6. + * Note that compression can be used only when dataset is chunked. + */ + dims[0] = 1000; + dims[1] = 20; + cdims[0] = 20; + cdims[1] = 20; + DataSpace *dataspace = new DataSpace(RANK, dims); // create new dspace + DSetCreatPropList ds_creatplist; // create dataset creation prop list + ds_creatplist.setChunk( 2, cdims ); // then modify it for compression + ds_creatplist.setDeflate( 6 ); + + /* + * Create the first dataset. + */ + DataSet* dataset = new DataSet(file->createDataSet( + "/Data/Compressed_Data", PredType::NATIVE_INT, + *dataspace, ds_creatplist )); + + /* + * Close the first dataset. + */ + delete dataset; + delete dataspace; + + /* + * Create the second dataset. + */ + dims[0] = 500; + dims[1] = 20; + dataspace = new DataSpace(RANK, dims); // create second dspace + dataset = new DataSet(file->createDataSet("/Data/Float_Data", + PredType::NATIVE_FLOAT, *dataspace)); + + delete dataset; + delete dataspace; + delete group; + delete file; + + /* + * Now reopen the file and group in the file. + */ + file = new H5File(FILE_NAME, H5F_ACC_RDWR); + group = new Group(file->openGroup("Data")); + + /* + * Access "Compressed_Data" dataset in the group. + */ + try { // to determine if the dataset exists in the group + dataset = new DataSet( group->openDataSet( "Compressed_Data" )); + } + catch( GroupIException not_found_error ) { + cout << " Dataset is not found." << endl; + } + cout << "dataset \"/Data/Compressed_Data\" is open" << endl; + + /* + * Close the dataset. + */ + delete dataset; + + /* + * Create hard link to the Data group. + */ + file->link( H5G_LINK_HARD, "Data", "Data_new" ); + + /* + * We can access "Compressed_Data" dataset using created + * hard link "Data_new". + */ + try { // to determine if the dataset exists in the file + dataset = new DataSet(file->openDataSet( "/Data_new/Compressed_Data" )); + } + catch( FileIException not_found_error ) + { + cout << " Dataset is not found." << endl; + } + cout << "dataset \"/Data_new/Compressed_Data\" is open" << endl; + + /* + * Close the dataset. + */ + delete dataset; + + /* + * Use iterator to see the names of the objects in the file + * root directory. + */ + cout << endl << "Iterating over elements in the file" << endl; + herr_t idx = H5Giterate(file->getId(), "/", NULL, file_info, NULL); + cout << endl; + + /* + * Unlink name "Data" and use iterator to see the names + * of the objects in the file root direvtory. + */ + cout << "Unlinking..." << endl; + try { // attempt to unlink the dataset + file->unlink( "Data" ); + } + catch( FileIException unlink_error ) + { + cout << " unlink failed." << endl; + } + cout << "\"Data\" is unlinked" << endl; + + cout << endl << "Iterating over elements in the file again" << endl; + idx = H5Giterate(file->getId(), "/", NULL, file_info, NULL); + cout << endl; + + /* + * Close the group and file. + */ + delete group; + delete file; + } // end of try block + + // catch failure caused by the H5File operations + catch( FileIException error ) + { + error.printError(); + return -1; + } + + // catch failure caused by the DataSet operations + catch( DataSetIException error ) + { + error.printError(); + return -1; + } + + // catch failure caused by the DataSpace operations + catch( DataSpaceIException error ) + { + error.printError(); + return -1; + } + + // catch failure caused by the Attribute operations + catch( AttributeIException error ) + { + error.printError(); + return -1; + } + return 0; } /* @@ -227,5 +242,5 @@ file_info(hid_t loc_id, const char *name, void *opdata) H5Gclose(group); return 0; - } +} diff --git a/c++/examples/writedata.cpp b/c++/examples/writedata.cpp index 3691f0b..b12e38d 100644 --- a/c++/examples/writedata.cpp +++ b/c++/examples/writedata.cpp @@ -1,7 +1,7 @@ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * - * Copyright by the Board of Trustees of the University of Illinois. * - * All rights reserved. * - * * + * Copyright by the Board of Trustees of the University of Illinois. * + * All rights reserved. * + * * * This file is part of HDF5. The full HDF5 copyright notice, including * * terms governing use, modification, and redistribution, is contained in * * the files COPYING and Copyright.html. COPYING can be found at the root * @@ -48,208 +48,290 @@ const int MSPACE1_DIM = 50; // Dataset size in memory const int MSPACE2_RANK = 1; // Rank of the second dataset in memory const int MSPACE2_DIM = 4; // Dataset size in memory const int FSPACE_RANK = 2; // Dataset rank as it is stored in the file -const int FSPACE_DIM1 = 8; // Dimension sizes of the dataset as it is... -const int FSPACE_DIM2 = 12; // ...stored in the file -const int MSPACE_DIM1 = 8; // We will read dataset back from the file... -const int MSPACE_DIM2 = 12; // ...to the dataset in memory with these ... - // ...dataspace parameters -const int NPOINTS = 4; // Number of points that will be selected... - // ...and overwritten +const int FSPACE_DIM1 = 8; // Dimension sizes of the dataset as it is +const int FSPACE_DIM2 = 12; // stored in the file +const int MSPACE_RANK = 2; // Rank of the first dataset in memory +const int MSPACE_DIM1 = 8; // We will read dataset back from the file +const int MSPACE_DIM2 = 9; // to the dataset in memory with these + // dataspace parameters +const int NPOINTS = 4; // Number of points that will be selected + // and overwritten int main (void) { - /* - * Buffers' initialization. - */ - int i,j; - int vector[MSPACE1_DIM]; - vector[0] = vector[MSPACE1_DIM - 1] = -1; - for (i = 1; i < MSPACE1_DIM - 1; i++) - vector[i] = i; - - int matrix[MSPACE_DIM1][MSPACE_DIM2]; - for (i = 0; i < MSPACE_DIM1; i++) - { - for (j = 0; j < MSPACE_DIM2; j++) - matrix[i][j] = 0; - } - - // Try block to detect exceptions raised by any of the calls inside it - try - { - /* - * Turn off the auto-printing when failure occurs so that we can - * handle the errors appropriately - */ - Exception::dontPrint(); - - /* - * Create a file. - */ - H5File* file = new H5File( FILE_NAME, H5F_ACC_TRUNC ); - - /* - * Create dataspace for the dataset in the file. - */ - hsize_t fdim[] = {FSPACE_DIM1, FSPACE_DIM2}; // dim sizes of ds (on disk) - DataSpace fspace( FSPACE_RANK, fdim ); - - /* - * Create dataset and write it into the file. - */ - DataSet* dataset = new DataSet( - file->createDataSet( DATASET_NAME, PredType::NATIVE_INT, fspace )); - dataset->write( matrix, PredType::NATIVE_INT ); - - /* - * Select hyperslab for the dataset in the file, using 3x2 blocks, - * (4,3) stride and (2,4) count starting at the position (0,1). - */ - hsize_t start[2]; // Start of hyperslab - hsize_t stride[2]; // Stride of hyperslab - hsize_t count[2]; // Block count - hsize_t block[2]; // Block sizes - 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); - - /* - * Create dataspace for the first dataset. - */ - hsize_t dim1[] = {MSPACE1_DIM}; /* Dimension size of the first dataset - (in memory) */ - DataSpace mspace1( MSPACE1_RANK, dim1 ); - - /* - * Select hyperslab. - * We will use 48 elements of the vector buffer starting at the - * second element. Selected elements are 1 2 3 . . . 48 - */ - start[0] = 1; - stride[0] = 1; - count[0] = 48; - block[0] = 1; - mspace1.selectHyperslab( H5S_SELECT_SET, count, start, stride, block); - - /* - * Write selection from the vector buffer to the dataset in the file. - * - * File dataset should look like this: - * 0 1 2 0 3 4 0 5 6 0 7 8 - * 0 9 10 0 11 12 0 13 14 0 15 16 - * 0 17 18 0 19 20 0 21 22 0 23 24 - * 0 0 0 0 0 0 0 0 0 0 0 0 - * 0 25 26 0 27 28 0 29 30 0 31 32 - * 0 33 34 0 35 36 0 37 38 0 39 40 - * 0 41 42 0 43 44 0 45 46 0 47 48 - * 0 0 0 0 0 0 0 0 0 0 0 0 - */ - dataset->write( vector, PredType::NATIVE_INT, mspace1, fspace ); - - /* - * Reset the selection for the file dataspace fid. - */ - fspace.selectNone(); - - /* - * Create dataspace for the second dataset. - */ - hsize_t dim2[] = {MSPACE2_DIM}; /* Dimension size of the second dataset - (in memory */ - DataSpace mspace2( MSPACE2_RANK, dim2 ); - - /* - * Select sequence of NPOINTS points in the file dataspace. - */ - hsize_t coord[NPOINTS][FSPACE_RANK]; /* Array to store selected points - from the file dataspace */ - 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, (const hsize_t **)coord); - - /* - * Write new selection of points to the dataset. - */ - int values[] = {53, 59, 61, 67}; /* New values to be written */ - dataset->write( values, PredType::NATIVE_INT, mspace2, fspace ); - - /* - * File dataset should look like this: - * 53 1 2 0 3 4 0 5 6 0 7 8 - * 0 9 10 0 11 12 0 13 14 0 15 16 - * 0 17 18 0 19 20 0 21 22 0 23 24 - * 0 0 0 59 0 61 0 0 0 0 0 0 - * 0 25 26 0 27 28 0 29 30 0 31 32 - * 0 33 34 0 35 36 67 37 38 0 39 40 - * 0 41 42 0 43 44 0 45 46 0 47 48 - * 0 0 0 0 0 0 0 0 0 0 0 0 - * - */ - - /* - * Close the dataset and the file. - */ - delete dataset; - delete file; - - /* - * Open the file. - */ - file = new H5File( FILE_NAME, H5F_ACC_RDONLY ); - - /* - * Open the dataset. - */ - dataset = new DataSet( file->openDataSet( DATASET_NAME )); - - /* - * Read data back to the buffer matrix. - */ - dataset->read( matrix, PredType::NATIVE_INT ); - - /* - * Display the result. - */ - for (i=0; i < MSPACE_DIM1; i++) - { - for(j=0; j < MSPACE_DIM2; j++) - cout << matrix[i][j] << " "; - cout << endl; - } - - /* - * Close the dataset and the file. - */ - delete dataset; - delete file; + int i,j; // loop indices */ + + /* + * Try block to detect exceptions raised by any of the calls inside it + */ + try + { + /* + * Turn off the auto-printing when failure occurs so that we can + * handle the errors appropriately + */ + Exception::dontPrint(); + + /* + * Create a file. + */ + H5File* file = new H5File( FILE_NAME, H5F_ACC_TRUNC ); + + /* + * Create property list for a dataset and set up fill values. + */ + int fillvalue = 0; /* Fill value for the dataset */ + DSetCreatPropList plist; + plist.setFillValue(PredType::NATIVE_INT, &fillvalue); + + /* + * Create dataspace for the dataset in the file. + */ + hsize_t fdim[] = {FSPACE_DIM1, FSPACE_DIM2}; // dim sizes of ds (on disk) + DataSpace fspace( FSPACE_RANK, fdim ); + + /* + * Create dataset and write it into the file. + */ + DataSet* dataset = new DataSet(file->createDataSet( + DATASET_NAME, PredType::NATIVE_INT, fspace, plist)); + + /* + * Select hyperslab for the dataset in the file, using 3x2 blocks, + * (4,3) stride and (2,4) count starting at the position (0,1). + */ + hsize_t start[2]; // Start of hyperslab + hsize_t stride[2]; // Stride of hyperslab + hsize_t count[2]; // Block count + hsize_t block[2]; // Block sizes + 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); + + /* + * Create dataspace for the first dataset. + */ + hsize_t dim1[] = {MSPACE1_DIM}; /* Dimension size of the first dataset + (in memory) */ + DataSpace mspace1( MSPACE1_RANK, dim1 ); + + /* + * Select hyperslab. + * We will use 48 elements of the vector buffer starting at the + * second element. Selected elements are 1 2 3 . . . 48 + */ + start[0] = 1; + stride[0] = 1; + count[0] = 48; + block[0] = 1; + mspace1.selectHyperslab( H5S_SELECT_SET, count, start, stride, block); + + /* + * Write selection from the vector buffer to the dataset in the file. + * + * File dataset should look like this: + * 0 1 2 0 3 4 0 5 6 0 7 8 + * 0 9 10 0 11 12 0 13 14 0 15 16 + * 0 17 18 0 19 20 0 21 22 0 23 24 + * 0 0 0 0 0 0 0 0 0 0 0 0 + * 0 25 26 0 27 28 0 29 30 0 31 32 + * 0 33 34 0 35 36 0 37 38 0 39 40 + * 0 41 42 0 43 44 0 45 46 0 47 48 + * 0 0 0 0 0 0 0 0 0 0 0 0 + */ + int vector[MSPACE1_DIM]; // vector buffer for dset + + /* + * Buffer initialization. + */ + vector[0] = vector[MSPACE1_DIM - 1] = -1; + for (i = 1; i < MSPACE1_DIM - 1; i++) + vector[i] = i; + + dataset->write( vector, PredType::NATIVE_INT, mspace1, fspace ); + + /* + * Reset the selection for the file dataspace fid. + */ + fspace.selectNone(); + + /* + * Create dataspace for the second dataset. + */ + hsize_t dim2[] = {MSPACE2_DIM}; /* Dimension size of the second dataset + (in memory */ + DataSpace mspace2( MSPACE2_RANK, dim2 ); + + /* + * Select sequence of NPOINTS points in the file dataspace. + */ + hsize_t coord[NPOINTS][FSPACE_RANK]; /* Array to store selected points + from the file dataspace */ + 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, (const hsize_t **)coord); + + /* + * Write new selection of points to the dataset. + */ + int values[] = {53, 59, 61, 67}; /* New values to be written */ + dataset->write( values, PredType::NATIVE_INT, mspace2, fspace ); + + /* + * File dataset should look like this: + * 53 1 2 0 3 4 0 5 6 0 7 8 + * 0 9 10 0 11 12 0 13 14 0 15 16 + * 0 17 18 0 19 20 0 21 22 0 23 24 + * 0 0 0 59 0 61 0 0 0 0 0 0 + * 0 25 26 0 27 28 0 29 30 0 31 32 + * 0 33 34 0 35 36 67 37 38 0 39 40 + * 0 41 42 0 43 44 0 45 46 0 47 48 + * 0 0 0 0 0 0 0 0 0 0 0 0 + * + */ + + /* + * Close the dataset and the file. + */ + delete dataset; + delete file; + + /* + * Open the file. + */ + file = new H5File( FILE_NAME, H5F_ACC_RDONLY ); + + /* + * Open the dataset. + */ + dataset = new DataSet( file->openDataSet( DATASET_NAME )); + + /* + * Get dataspace of the dataset. + */ + fspace = dataset->getSpace(); + + /* + * Select first hyperslab for the dataset in the file. The following + * elements are selected: + * 10 0 11 12 + * 18 0 19 20 + * 0 59 0 61 + * + */ + start[0] = 1; start[1] = 2; + block[0] = 1; block[1] = 1; + stride[0] = 1; stride[1] = 1; + count[0] = 3; count[1] = 4; + fspace.selectHyperslab(H5S_SELECT_SET, count, start, stride, block); + + /* + * Add second selected hyperslab to the selection. + * The following elements are selected: + * 19 20 0 21 22 + * 0 61 0 0 0 + * 27 28 0 29 30 + * 35 36 67 37 38 + * 43 44 0 45 46 + * 0 0 0 0 0 + * Note that two hyperslabs overlap. Common elements are: + * 19 20 + * 0 61 + */ + start[0] = 2; start[1] = 4; + block[0] = 1; block[1] = 1; + stride[0] = 1; stride[1] = 1; + count[0] = 6; count[1] = 5; + fspace.selectHyperslab(H5S_SELECT_OR, count, start, stride, block); + + /* + * Create memory dataspace. + */ + hsize_t mdim[] = {MSPACE_DIM1, MSPACE_DIM2}; /* Dimension sizes of the + dataset in memory when we + read selection from the + dataset on the disk */ + DataSpace mspace(MSPACE_RANK, mdim); + + /* + * Select two hyperslabs in memory. Hyperslabs has the same + * size and shape as the selected hyperslabs for the file dataspace. + */ + start[0] = 0; start[1] = 0; + block[0] = 1; block[1] = 1; + stride[0] = 1; stride[1] = 1; + count[0] = 3; count[1] = 4; + mspace.selectHyperslab(H5S_SELECT_SET, count, start, stride, block); + start[0] = 1; start[1] = 2; + block[0] = 1; block[1] = 1; + stride[0] = 1; stride[1] = 1; + count[0] = 6; count[1] = 5; + mspace.selectHyperslab(H5S_SELECT_OR, count, start, stride, block); + + /* + * Initialize data buffer. + */ + int matrix_out[MSPACE_DIM1][MSPACE_DIM2]; + for (i = 0; i < MSPACE_DIM1; i++) + for (j = 0; j < MSPACE_DIM2; j++) + matrix_out[i][j] = 0; + + /* + * Read data back to the buffer matrix. + */ + dataset->read(matrix_out, PredType::NATIVE_INT, mspace, fspace); + + /* + * Display the result. Memory dataset is: + * + * 10 0 11 12 0 0 0 0 0 + * 18 0 19 20 0 21 22 0 0 + * 0 59 0 61 0 0 0 0 0 + * 0 0 27 28 0 29 30 0 0 + * 0 0 35 36 67 37 38 0 0 + * 0 0 43 44 0 45 46 0 0 + * 0 0 0 0 0 0 0 0 0 + * 0 0 0 0 0 0 0 0 0 + */ + for (i=0; i < MSPACE_DIM1; i++) + { + for(j=0; j < MSPACE_DIM2; j++) + cout << matrix_out[i][j] << " "; + cout << endl; + } + + /* + * Close the dataset and the file. + */ + delete dataset; + delete file; } // end of try block // catch failure caused by the H5File operations catch( FileIException error ) { - error.printError(); - return -1; + error.printError(); + return -1; } // catch failure caused by the DataSet operations catch( DataSetIException error ) { - error.printError(); - return -1; + error.printError(); + return -1; } // catch failure caused by the DataSpace operations catch( DataSpaceIException error ) { - error.printError(); - return -1; + error.printError(); + return -1; } return 0; - } |