Hi Werner, I already try your suggestion using sizeof to fill the offset parameter, but I still found problems. Suppose I create compound data type as below: ------------------------------------------------------------------------------------------------------------------------------------- typeId1 = H5T.create(H5T.CreateClass.COMPOUND,14); H5T.insert(typeId1, "fractional", 0, H5T.H5Type.NATIVE_INT); H5T.insert(typeId1, "charges", sizeof(int), H5T.H5Type.NATIVE_FLOAT); H5T.insert(typeId1, "phase angle", sizeof(float)+sizeof(int), H5T.H5Type.NATIVE_SHORT); H5T.insert(typeId1, "EMT", sizeof(short)+sizeof(float)+sizeof(int), H5T.H5Type.NATIVE_FLOAT); ------------------------------------------------------------------------------------------------------------------------------------- for the first row of the data, it is successfully inserted the right data for fractional, charges, and phase angle. But for EMT, it was converted into different values, and after that for the next row until the end, all of the value was changed from the sources value in dset_data. What will be the problem?
And yes, I agree with you about the string in C++, I read issues regarding this matter: HDF5 STRING is not a string but in fact a char * //since it is we need to translate the return into a pointer address Therefore, is there any different ways to implement string in compound data types or it is the only way to use string in HDF5 file? Do you have any codes to implement the string in HDF5? Thank you so much for your help. Regards, Elisa MS --- On Wed, 9/1/10, Werner Benger <[email protected]> wrote: From: Werner Benger <[email protected]> Subject: Re: [Hdf-forum] using compound data types To: "HDF Users Discussion List" <[email protected]>, "elisa sibarani" <[email protected]> Date: Wednesday, September 1, 2010, 4:32 AM 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)); -----Inline Attachment Follows----- _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org -- ___________________________________________________________________________ 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
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