Hi,
I am a newer to HDF5. I have a question, and didn't find the solution on internet. Could you help me? Thanks.
I create three group named "fileHead" "auxiliaryInfo" "observationData" in sequence. But the HDFView show is "auxiliaryInfo" "fileHead" "observationData" by alphabet. I want to show by the creation sequence. So what should I do when I create these groups?
The dataset is also has this phenomenon.
Thanks for your help.
HaijunYu
Hello Haijun,
The HDFView tool allows you to change the order that groups are displayed. This is a property in the file that can be modified.
However, please note that the property must be set when the file is created in order to change the display order in HDFView.
To change the order in HDFView, select the "Tools" drop down menu and then select "User Options".
A "User Options" window will pop up. At the bottom of the window you will see "Display Indexing Options". You have the choice of
selecting "By Name" or "By Creation Order". You must close the file and reopen it for the changes to take place.
To change the order that groups are displayed in the file you use the Group Creation Property API, H5Pset_link_creation_order.
For example, you would create an instance of the Group Creation Property, modify it by calling H5Pset_link_creation_order, and
then pass that into the H5Gcreate call (in the group creation property parameter):
gcpl = H5Pcreate (H5P_GROUP_CREATE);
status = H5Pset_link_creation_order( gcpl, H5P_CRT_ORDER_TRACKED |
H5P_CRT_ORDER_INDEXED );
group = H5Gcreate (file, "index_group", H5P_DEFAULT, gcpl, H5P_DEFAULT);
...
status = H5Pclose (gcpl);
There are the H5Literate* and H5visit/H5Ovisit APIs for traversing the objects in a file. You can specify the index to be used (by name or by creation
order).
On the Examples page you can find many different examples. See:
https://www.hdfgroup.org/HDF5/examples/
Please look at the examples "By API" for examples of modifying the group creation order and traversing a file.
Specifically for C examples By API, look under the "Groups:" section:
https://www.hdfgroup.org/HDF5/examples/api18-c.html#grps
On this page see the following examples:
To track links in a group by creation order, see: h5ex_g_corder.c
This example also shows how to traverse a group by creation order and by name.
To traverse a file also see:
h5ex_g_iterate.c
h5ex_g_traverse.c
h5ex_g_visit.c
Examples "By API" are also provided for other languages (Fortran, Java, ...) from the Examples page.
Let me know if you have further questions!
-Barbara
help@hdfgroup.org
From: Hdf-forum [mailto:hdf-forum-bounces@lists.hdfgroup.org] On Behalf Of ???
Sent: Thursday, June 23, 2016 8:11 PM
To: hdf-forum@lists.hdfgroup.org
Subject: [Hdf-forum] group/dataset sequence
Hi,
I am a newer to HDF5. I have a question, and didn't find the solution on internet. Could you help me? Thanks.
I create three group named "fileHead" "auxiliaryInfo" "observationData" in sequence. But the HDFView show is "auxiliaryInfo" "fileHead" "observationData" by alphabet. I want to show by the creation sequence. So what should I do when I create these groups?
The dataset is also has this phenomenon.
[cid:image001.jpg@01D1D117.E4601490]
Thanks for your help.
HaijunYu
Wonderful! Thank barbara for your help. It solved my problem.
At 2016-06-28 23:36:43, "Barbara Jones" <bljones@hdfgroup.org> wrote:
Hello Haijun,
The HDFView tool allows you to change the order that groups are displayed. This is a property in the file that can be modified.
However, please note that the property must be set when the file is created in order to change the display order in HDFView.
To change the order in HDFView, select the “Tools” drop down menu and then select “User Options”.
A “User Options” window will pop up. At the bottom of the window you will see “Display Indexing Options”. You have the choice of
selecting “By Name” or “By Creation Order”. You must close the file and reopen it for the changes to take place.
To change the order that groups are displayed in the file you use the Group Creation Property API, H5Pset_link_creation_order.
For example, you would create an instance of the Group Creation Property, modify it by calling H5Pset_link_creation_order, and
then pass that into the H5Gcreate call (in the group creation property parameter):
gcpl = H5Pcreate (H5P_GROUP_CREATE);
status = H5Pset_link_creation_order( gcpl, H5P_CRT_ORDER_TRACKED |
H5P_CRT_ORDER_INDEXED );
group = H5Gcreate (file, "index_group", H5P_DEFAULT, gcpl, H5P_DEFAULT);
…
status = H5Pclose (gcpl);
There are the H5Literate* and H5visit/H5Ovisit APIs for traversing the objects in a file. You can specify the index to be used (by name or by creation
order).
On the Examples page you can find many different examples. See:
https://www.hdfgroup.org/HDF5/examples/
Please look at the examples “By API” for examples of modifying the group creation order and traversing a file.
Specifically for C examples By API, look under the “Groups:” section:
https://www.hdfgroup.org/HDF5/examples/api18-c.html#grps
On this page see the following examples:
To track links in a group by creation order, see: h5ex_g_corder.c
This example also shows how to traverse a group by creation order and by name.
To traverse a file also see:
h5ex_g_iterate.c
h5ex_g_traverse.c
h5ex_g_visit.c
Examples “By API” are also provided for other languages (Fortran, Java, …) from the Examples page.
Let me know if you have further questions!
-Barbara
help@hdfgroup.org
From: Hdf-forum [mailto:hdf-forum-bounces@lists.hdfgroup.org] On Behalf Of ???
Sent: Thursday, June 23, 2016 8:11 PM
To:hdf-forum@lists.hdfgroup.org
Subject: [Hdf-forum] group/dataset sequence
Hi,
I am a newer to HDF5. I have a question, and didn't find the solution on internet. Could you help me? Thanks.
I create three group named "fileHead" "auxiliaryInfo" "observationData" in sequence. But the HDFView show is "auxiliaryInfo" "fileHead" "observationData" by alphabet. I want to show by the creation sequence. So what should I do when I create these groups?
The dataset is also has this phenomenon.
Thanks for your help.
HaijunYu
