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core.py: Enable correct exporting of char data #95

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core.py: Enable correct exporting of char data #95

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5 changes: 5 additions & 0 deletions pyulog/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -426,6 +426,11 @@ def _make_data_items(self):
field_type = field.type_str
field_encoding = self._UNPACK_TYPES[field_type][0]
field_data = data_set.data[field_name][i_sample]

# For char type, convert np.int8 into single bytes() object so that struct.pack can handle it
if field_encoding == 'c':
field_data = bytes(chr(field_data), 'utf-8')

data.extend(struct.pack('<' + field_encoding, field_data))

header = struct.pack('<HB', len(data), self.MSG_TYPE_DATA)
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