I have a feeling this a file descriptor problem. I noticed you didn't close the FD you opened when writing so I put the write and read blocks in their own scope (see below). This seems to work now. I'm not sure if you can write and read from a gzip'd file at the same time, maybe someone else can address this issue? compiled with boost 1.45 (gcc)
g++ test.cpp -otest -lboost_iostreams -lboost_filesystem -lboost_system ./test aaa aaa
/// BEGIN file: test.cpp #include <iostream> #include <boost/iostreams/filtering_streambuf.hpp> #include <boost/iostreams/filtering_stream.hpp> #include <boost/iostreams/copy.hpp> #include <boost/iostreams/filter/gzip.hpp> #include <boost/iostreams/device/file_descriptor.hpp> #include <boost/filesystem.hpp> using namespace std; namespace io = boost::iostreams; int main() { char* memblock_out = (char*) "aaa"; { io::filtering_ostream out; out.push(io::gzip_compressor()); out.push(io::file_descriptor_sink("outfile.tmp.gz")); out.write(memblock_out, size); } cout << memblock_out << endl; char* memblock_in = new char [4]; { io::filtering_istream in; in.push(io::gzip_decompressor()); in.push(io::file_descriptor_source("outfile.tmp.gz")); in.read(memblock_in, size); } cout << memblock_in << endl; } /// EOF -- View this message in context: http://boost.2283326.n4.nabble.com/Read-write-with-gzip-tp3478438p3478631.ht... Sent from the Boost - Users mailing list archive at Nabble.com.