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Added read/write support for more datatypes, and writing nullvalues #60

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Added read/write support for more datatypes, and writing nullvalues #60

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25 changes: 22 additions & 3 deletions shapefile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -96,7 +96,8 @@ def __repr__(self):

def signed_area(coords):
"""Return the signed area enclosed by a ring using the linear time
algorithm. A value >= 0 indicates a counter-clockwise oriented ring.
algorithm at http://www.cgafaq.info/wiki/Polygon_Area. A value >= 0
indicates a counter-clockwise oriented ring.
"""
xs, ys = map(list, zip(*coords))
xs.append(xs[1])
Expand Down Expand Up @@ -523,6 +524,20 @@ def __record(self):
elif typ == b('L'):
value = (value in b('YyTt') and b('T')) or \
(value in b('NnFf') and b('F')) or b('?')
elif typ in ("F","O"):
value = value.replace(b('\0'), b('')).strip()
value = value.replace(b('*'), b('')) # QGIS NULL is all '*' chars
if value == b(''):
value = None
else:
value = float(value)
elif typ == "I":
value = value.replace(b('\0'), b('')).strip()
value = value.replace(b('*'), b('')) # QGIS NULL is all '*' chars
if value == b(''):
value = None
else:
value = int(value)
else:
value = u(value)
value = value.strip()
Expand Down Expand Up @@ -915,8 +930,12 @@ def __dbfRecords(self):
for (fieldName, fieldType, size, dec), value in zip(self.fields, record):
fieldType = fieldType.upper()
size = int(size)
if fieldType.upper() == "N":
value = str(value).rjust(size)
if fieldType.upper() in ("N","F","O","I"):
if value is None or value is "":
value = str("*"*size) # QGIS NULL
else:
value = str(value).rjust(size)
# TODO: Do date field values need special packing or just normal str()?
elif fieldType == 'L':
value = str(value)[0].upper()
else:
Expand Down