Yeah, I was awfully confused at first too. In the code I've got working, I use filtering_ostream for both compression and decompression, and use a back_inserter like this: vector<char> comp; bio::filtering_ostream cStream; cStream.push(bio::zlib_compressor() | bio::back_inserter(comp)); cStream.write(decompressedMemory, decompressedSize); vector<char> decomp; bio::filtering_ostream dStream; dStream.push(bio::zlib_decompressor() | bio::back_inserter(decomp)); dStream.write(&comp[0], comp.size()); bio::close(dStream); Brian On Wed, Nov 10, 2010 at 12:42 AM, 陳韋任 wrote:

Dear all,

 Some compressed data was stored in a vector<char> buf (don't know if it's a right way to store compressed data). I used the "buf" as a source, and tried to add a gzip_decompressor to restore those data. I have tried the following approach, but it doesn't work.

 vector<char> buf;

 /* fill in the buf */

 namespace io = boost::iostreams;  io::filtering_istream in(boost::make_iterator_range(buf));  in.push(io::gzip_decompressor());

What I got is an exception,

 terminate called after throwing an instance of  'boost::exception_detail::clone_implstd::logic_error>'  what():  chain complete  Aborted

 How can I compose a source which comes from a container, and add a gzip_decompressor to the source? Thanks in advance.

Regards, chenwj

-- Wei-Jen Chen (陳韋任) Programming Language and System Laboratory (EC131) Department of Computer Science, National Chiao Tung University

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Hi Chenwj, boost-users-bounces@lists.boost.org on Wednesday, November 10, 2010 9:43 AM:

Dear all,

Some compressed data was stored in a vector<char> buf (don't know if it's a right way to store compressed data). I used the "buf" as a source, and tried to add a gzip_decompressor to restore those data. I have tried the following approach, but it doesn't work.

vector<char> buf;

/* fill in the buf */

namespace io = boost::iostreams; io::filtering_istream in(boost::make_iterator_range(buf)); in.push(io::gzip_decompressor());

What I got is an exception,

terminate called after throwing an instance of

'boost::exception_detail::clone_implstd::logic_error>' what(): chain complete Aborted

How can I compose a source which comes from a container, and add a gzip_decompressor to the source? Thanks in advance.

Regards, chenwj

it seems to me that "chain complete" is a very precise complaint. To use the filtering_istream you have to reverse natural order and push the source last. Simply try io::filtering_istream in; in.push(io::gzip_decompressor()); in.push(boost::make_iterator_range(buf)); Hope that helps, -- Christian Pfligersdorffer Software Engineering http://www.eos.info