Website hosting service by Active-Venture.com
  

 Back to Index


12.17.2 Unpacker Objects

The Unpacker class offers the following methods:

 

 
reset( data)
Resets the string buffer with the given data.

 

 
get_position( )
Returns the current unpack position in the data buffer.

 

 
set_position( position)
Sets the data buffer unpack position to position. You should be careful about using get_position() and set_position().

 

 
get_buffer( )
Returns the current unpack data buffer as a string.

 

 
done( )
Indicates unpack completion. Raises an Error exception if all of the data has not been unpacked.

In addition, every data type that can be packed with a Packer, can be unpacked with an Unpacker. Unpacking methods are of the form unpack_type(), and take no arguments. They return the unpacked object.

 

 
unpack_float( )
Unpacks a single-precision floating point number.

 

 
unpack_double( )
Unpacks a double-precision floating point number, similarly to unpack_float().

In addition, the following methods unpack strings, bytes, and opaque data:

 

 
unpack_fstring( n)
Unpacks and returns a fixed length string. n is the number of characters expected. Padding with null bytes to guaranteed 4 byte alignment is assumed.

 

 
unpack_fopaque( n)
Unpacks and returns a fixed length opaque data stream, similarly to unpack_fstring().

 

 
unpack_string( )
Unpacks and returns a variable length string. The length of the string is first unpacked as an unsigned integer, then the string data is unpacked with unpack_fstring().

 

 
unpack_opaque( )
Unpacks and returns a variable length opaque data string, similarly to unpack_string().

 

 
unpack_bytes( )
Unpacks and returns a variable length byte stream, similarly to unpack_string().

The following methods support unpacking arrays and lists:

 

 
unpack_list( unpack_item)
Unpacks and returns a list of homogeneous items. The list is unpacked one element at a time by first unpacking an unsigned integer flag. If the flag is 1, then the item is unpacked and appended to the list. A flag of 0 indicates the end of the list. unpack_item is the function that is called to unpack the items.

 

 
unpack_farray( n, unpack_item)
Unpacks and returns (as a list) a fixed length array of homogeneous items. n is number of list elements to expect in the buffer. As above, unpack_item is the function used to unpack each element.

 

 
unpack_array( unpack_item)
Unpacks and returns a variable length list of homogeneous items. First, the length of the list is unpacked as an unsigned integer, then each element is unpacked as in unpack_farray() above.

 

  

 

2002-2004 Active-Venture.com Webhosting Service

 

Disclaimer: This documentation is provided only for the benefits of our hosting customers.
For authoritative source of the documentation, please refer to http://python.org/doc/

 

Cheap domain registration : Register domain name or buy domain name, including free domain hosting services

 
Active-Domain.com offers cheap domain registration, domain name transfer and domain search services    

Domain registration : Buy domain name or register domain name from $5.95/year only