Changeset 661:c95ab1a80f49

Timestamp:

05/18/08 22:16:30 (2 years ago)

Author:

Howard Butler <hobu.inc@…>

Branch:

default

Convert:

svn:1766ff46-f334-0410-ab20-d63176f87757/trunk@728

Message:

some VLR stuff

Location:

python

Files:

• liblas/header.py (modified) (1 diff)
• liblas/vlr.py (modified) (2 diffs)
• tests/VLR.txt (modified) (1 diff)

python/liblas/header.py

@@ -352 +352 @@
         return core.las.LASHeader_SetProj4(self.handle, value)
     proj4 = property(get_proj4, set_proj4)
+    
+    def GetVLR(self, value):
+        return vlr.VLR(handle=core.las.LASHeader_GetVLR(self.handle, value))
+
+

python/liblas/vlr.py

@@ -42 +42 @@
  """
 import core
+import ctypes
 
 class VLR(object):
@@ -84 +85 @@
         return core.las.LASVLR_SetReserved(self.handle, value)
     reserved = property(get_reserved, set_reserved)
+    
+    def get_data(self):
+        b = ctypes.pointer(ctypes.c_ubyte())
+        i = ctypes.pointer(ctypes.c_int())
+        core.las.LASVLR_GetData(self.handle, ctypes.byref(b), i)
+        print 'i length: %s' % i.contents.value
+        print 'bvalue : %s' % b.contents
+
+        t = (ctypes.c_byte*i.contents.value)()
+        print 'b[0:71]: ', b[0:i.contents.value]
+        parray = ctypes.cast(b, ctypes.c_void_p(i.contents.value))
+        print 'parray value' , parray[0:i.contents.value]
+
+        o = ''.join([chr(b[i]) for i in range(i.contents.value)])
+        print 'o: ', o
+        print 'type(parray): ', type(parray)
+#        buf = ctypes.create_string_buffer(i.value)
+#        print type(buf)
+        return ctypes.cast(b, ctypes.c_char_p).value
+#        return ctypes.create_string_buffer(parray, i.contents.value)[:]
+    data = property(get_data)
+

python/tests/VLR.txt

@@ -19 +19 @@
   >>> v.description
   'libLAS'
+  
+  >>> from liblas import file
+  >>> f = file.File('../test/data/srs.las')
+  >>> h = f.header
+  >>> h.records_count
+  3L
+  >>> h.proj4
+  '+proj=utm +zone=17 +ellps=WGS84 +units=m '
+  >>> v = h.GetVLR(0)
+  >>> v.recordid
+  34735
+  >>> v.userid
+  'LASF_Projection'
+  
+  >>> data = v.data
+  >>> len(data)
+