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Hm, it looks suspicious to me that you reserve just one byte of space for the "minutes" entry as in:
H5T.insert(typeId1, "minutes", 0, H5T.H5Type.C_S1);
H5T.insert(typeId1, "fractional", 1, H5T.H5Type.NATIVE_INT);
^^
H5T.insert(typeId1, "charges", 5, H5T.H5Type.NATIVE_FLOAT);
Also, are you sure that "int" is always 4 bytes on any platform you run your code? Using sizeof(int) might be safer as in:
H5T.insert(typeId1, "charges", 1+sizeof(int) , H5T.H5Type.NATIVE_FLOAT);
However, my main concern would be about reserving one byte for the string. I'm not sure how C-strings are handled in HDF5, but it would seem that this leaves you just space for the 0-byte. C++ strings you can't save directly anyway, as they have an internal data structure with pointers to "somewhere", and you want to store the content of these pointers (that are hidden in the class definition) to the file, not the pointers themselves (which you would get by saving the address of a string object).
Werner
On Wed, 01 Sep 2010 10:20:10 +0200, elisa sibarani < [email protected]> wrote: I'm adding information, after I try to run my program again, the string data was converted into another symbol, and for other data (int, float, short) as well. I do not know what factors caused it, since I already used the available data type in HDF5DotNet.
But, if I try for each of the data, first I try to insert just string, it is still changed into another symbol, but if I only insert integer data, the actual value can be inserted.
I guess the problem comes from H5Array<struct1>(dset_data), when it wrap the array, it changes the value as well?
H5D.write(dataSetId,typeId1,new H5Array<struct1>(dset_data));
Hope that I can see any reply regarding this matter.
Thank you.
regards,
Elisa
--- On Tue, 8/31/10, elisa sibarani <[email protected]> wrote:
From: elisa sibarani <[email protected]>
Subject: [Hdf-forum] using compound data types
To: [email protected]
Date: Tuesday, August 31, 2010, 11:48 PM
Hi All,
I use compound data types for my dataset, and here I create the struct first, and then load the data, after that create compound data types, create dataset using that compound data types, and finally write into the dataset. I don't know what was wrong with my code, because the result's looking was not exactly what I want. The reason because:
1. The string data that should contains hour:minute (for example 1:20, 17:50) was change into symbol in the HDF5 file
2. The dataset do not containt the same structures as the dset_data (array as the source
data), it is messy in the HDF5 file.
Until now, I'm trying to fix this, but still can't find any clue.
Thanks
regards,
Elisa
Here is the copy of my code:
public struct struct1
{
public string a;
public int b;
public float c;
public short d;
public int e;
}
public void btnInsert()
{
struct1[] dset_data = new struct1[numline];
foreach (string s in pd_data)
{
if (temp1 == 1)
{
dset_data[temp].a = s;
}
if (temp1 == 2)
{
dset_data[temp].b =
int.Parse(s);
}
if (temp1 == 3)
{
if (s == null || s.Length == 0)
{
dset_data[temp].c = float.Parse("0");
}
else
{
dset_data[temp].c = float.Parse(s);
}
}
if (temp1 == 4)
{
dset_data[temp].d = short.Parse(s);
}
if (temp1 == 5)
{
if (s == null || s.Length
== 0)
{
dset_data[temp].e = int.Parse("0");
}
else
{
dset_data[temp].e = int.Parse(s);
}
}
temp1 = temp1 + 1;
}
//create data space
ulong[] dims = new ulong[1];
dims[0] = ulong.Parse(numline.ToString());
spaceId = H5S.create_simple(1, dims);
//create compound data type
typeId1 = H5T.create(H5T.CreateClass.COMPOUND,15);
H5T.insert(typeId1, "minutes", 0, H5T.H5Type.C_S1);
H5T.insert(typeId1, "fractional", 1, H5T.H5Type.NATIVE_INT);
H5T.insert(typeId1, "charges", 5,
H5T.H5Type.NATIVE_FLOAT);
H5T.insert(typeId1, "phase angle", 9, H5T.H5Type.NATIVE_SHORT);
H5T.insert(typeId1, "EMT", 11, H5T.H5Type.NATIVE_INT);
dataSetId = H5D.create(fileId, "/" + circuitid + "/" + groupname[0] + "/" + groupname[1] + "/" + groupname[2] + "/" + groupname[3], typeId1, spaceId);
// Write the data to the data set.
H5D.write(dataSetId,typeId1,new H5Array<struct1>(dset_data));
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-- ___________________________________________________________________________
Dr. Werner Benger Visualization Research
Laboratory for Creative Arts and Technology (LCAT)
Center for Computation & Technology at Louisiana State University (CCT/LSU)
211 Johnston Hall, Baton Rouge, Louisiana 70803
Tel.: +1 225 578 4809 Fax.: +1 225 578-5362 |
