public static (bool success, IEnumerable <string> result) ReadStrings(long groupId, string name, string alternativeName)
{
var datasetId = H5D.open(groupId, Hdf5Utils.NormalizedName(name));
if (datasetId < 0) //does not exist?
{
datasetId = H5D.open(groupId, Hdf5Utils.NormalizedName(alternativeName));
}
if (datasetId <= 0)
{
Hdf5Utils.LogError?.Invoke($"Error reading {groupId}. Name:{name}. AlternativeName:{alternativeName}");
return(false, Array.Empty <string>());
}
long typeId = H5D.get_type(datasetId);
long spaceId = H5D.get_space(datasetId);
long count = H5S.get_simple_extent_npoints(spaceId);
H5S.close(spaceId);
var strs = new List <string>();
if (count >= 0)
{
IntPtr[] rdata = new IntPtr[count];
GCHandle hnd = GCHandle.Alloc(rdata, GCHandleType.Pinned);
H5D.read(datasetId, typeId, H5S.ALL, H5S.ALL,
H5P.DEFAULT, hnd.AddrOfPinnedObject());
for (int i = 0; i < rdata.Length; ++i)
{
int len = 0;
while (Marshal.ReadByte(rdata[i], len) != 0)
{
++len;
}
byte[] buffer = new byte[len];
Marshal.Copy(rdata[i], buffer, 0, buffer.Length);
string s = Hdf5Utils.ReadStringBuffer(buffer);
strs.Add(s);
// H5.free_memory(rdata[i]);
}
hnd.Free();
}
H5T.close(typeId);
H5D.close(datasetId);
return(true, strs);
}
public static string ReadUnicodeString(long groupId, string name)
{
var datasetId = H5D.open(groupId, Hdf5Utils.NormalizedName(name));
var typeId = H5D.get_type(datasetId);
if (H5T.is_variable_str(typeId) > 0)
{
var spaceId = H5D.get_space(datasetId);
long count = H5S.get_simple_extent_npoints(spaceId);
IntPtr[] rdata = new IntPtr[count];
GCHandle hnd = GCHandle.Alloc(rdata, GCHandleType.Pinned);
H5D.read(datasetId, typeId, H5S.ALL, H5S.ALL,
H5P.DEFAULT, hnd.AddrOfPinnedObject());
var attrStrings = new List <string>();
for (int i = 0; i < rdata.Length; ++i)
{
int attrLength = 0;
while (Marshal.ReadByte(rdata[i], attrLength) != 0)
{
++attrLength;
}
byte[] buffer = new byte[attrLength];
Marshal.Copy(rdata[i], buffer, 0, buffer.Length);
string stringPart = Hdf5Utils.ReadStringBuffer(buffer);
attrStrings.Add(stringPart);
H5.free_memory(rdata[i]);
}
hnd.Free();
H5S.close(spaceId);
H5D.close(datasetId);
return(attrStrings[0]);
}
// Must be a non-variable length string.
int size = H5T.get_size(typeId).ToInt32();
IntPtr iPtr = Marshal.AllocHGlobal(size);
int result = H5D.read(datasetId, typeId, H5S.ALL, H5S.ALL,
H5P.DEFAULT, iPtr);
if (result < 0)
{
throw new IOException("Failed to read dataset");
}
var strDest = new byte[size];
Marshal.Copy(iPtr, strDest, 0, size);
Marshal.FreeHGlobal(iPtr);
H5D.close(datasetId);
return(Hdf5Utils.ReadStringBuffer(strDest).TrimEnd((char)0));
}