Hi folks,
Sorry if this has been addressed before, I nosed around a little bit but
didn't see anything related to what I'm currently experiencing. I've been
trying to find a way to store some variable-length data in my
IsDescription-derived table row, and I tried to do it by creating a
StringCol with a maximum width, and then byte-packing my data with
struct.pack() and writing the bytestring to the table row. However, when I
read back the written string from the file, the bytestring has been
truncated. I've attached an example where I try to write out a length-240
string and get back a length 237 string.
This is with PyTables 2.1.2 and numpy 1.3. Thanks in advance.
--cb
import cPickle as pickle
import struct
import tables
class MyRow(tables.IsDescription):
run = tables.Int32Col()
event = tables.Int32Col()
nstr = tables.Int32Col()
bstr = tables.StringCol(4*6*100)
fp = tables.openFile("strtest.h5", 'w')
nt = fp.createTable(fp.root, "nt", MyRow, "yea")
nt.row['run'] = 10
nt.row['event'] = 1
bstr_vals = []
i = 0
while i < 10:
bstr_vals.append((float(i)*10,
float(i)*10,
float(i)*10,
i,
i,
i))
i+=1
bytestr = ''
for row in bstr_vals:
bytestr += struct.pack("fffiii", *row)
print "before", len(bytestr), 4*6*100
nt.row['nstr'] = len(bstr_vals)
nt.row['bstr'] = bytestr
nt.row.append()
nt.flush()
fp.close()
fp = tables.openFile("strtest.h5")
nstr = fp.root.nt[0]['nstr']
bytestr = fp.root.nt[0]['bstr']
print "after", len(bytestr)
print struct.unpack(nstr * "fffiii", bytestr)
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