[svn-r3086] Renamed h5group.C to h5group.cpp

1 files changed, 196 insertions, 0 deletions

diff --git a/c++/examples/h5group.cpp b/c++/examples/h5group.cpp
new file mode 100644
index 0000000..514e002
--- /dev/null
+++ b/c++/examples/h5group.cpp
@@ -0,0 +1,196 @@
+//
+// This example creates a group in the file and dataset in the group. 
+// Hard link to the group object is created and the dataset is accessed
+// under different names. 
+// Iterator function is used to find the object names in the root group.
+// Note that the C++ API iterator function is not completed yet, thus
+// the C version is used in this example.
+// 
+#include <string>
+#ifndef H5_NO_NAMESPACE
+using namespace std;
+#endif
+
+#ifdef OLD_HEADER_FILENAME
+#include <iostream.h>
+#else
+#include <iostream>
+#endif
+#include "H5Cpp.h"
+
+#ifndef H5_NO_NAMESPACE
+using namespace H5;
+#endif
+
+const 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);
+
+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
+   {
+      // 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();
+   }
+
+   // catch failure caused by the DataSet operations
+   catch( DataSetIException error )
+   {
+      error.printError();
+   }
+
+   // catch failure caused by the DataSpace operations
+   catch( DataSpaceIException error )
+   {
+      error.printError();
+   }
+
+   // catch failure caused by the Attribute operations
+   catch( AttributeIException error )
+   {
+      error.printError();
+   }
+   return 0;
+}
+
+//
+// Operator function.
+//
+herr_t
+file_info(hid_t loc_id, const char *name, void *opdata)
+{
+    hid_t group;
+    //
+     // Open the group using its name.
+     //
+    group = H5Gopen(loc_id, name);
+ 
+    //
+     // Display group name.
+     //
+    cout << "Name : " << name << endl;
+    
+    H5Gclose(group);
+    return 0;
+ }
+