[Boost-users] How to use boost iostream with zlib

6 Jul 2007

      I can successfully compile the code with the add of one "using" statement
but the linker reports linker error.

Code:

// ...
#include 
#include 

int main()
{
    using namespace std;
    using namespace boost::iostreams; // Added this line.
    ifstream file("hello.z", ios_base::in | ios_base::binary);
    filtering_streambuf<input> in;
    // ...
}

Linker error:
g++ -ozlib.exe -lboost_iostreams-mgw34-mt-1_34 zlib.cpp
SOME/PATH/HERE/ccW0caaa.o(.text$_ZN5boost9iostreams6detail22zlib_decompressor_implISaIcEEC2Ei[boost::iostreams::detail::zlib_decompressor_impl
...
::zlib_decompressor_impl(int)]+0x46):zlib.cpp: undefined reference to
`boost::iostreams::detail::zlib_base::zlib_base()'
SOME/PATH/HERE/ccW0caaa.o(.text$_ZN5boost9iostreams6detail22zlib_decompressor_implISaIcEEC2Ei[boost::iostreams::detail::zlib_decompressor_impl&)]+0x67):zlib.cpp: undefined reference to
`boost::iostreams::detail::zlib_base::do_init(boost::iostreams::zlib_params
const&, bool, void* (*)(void*, unsigned int, unsigned int), void (*)(void*,
void*), void*)'
SOME/PATH/HERE/ccW0caaa.o(.text$_ZN5boost9iostreams6detail22zlib_decompressor_implISaIcEE6filterERPKcS6_RPcS8_b[boost::iostreams::detail::zlib_decompressor_impl
collect2: ld returned 1 exit status
Built using Boost 1.34 with Multi-threading support, MinGW g++ 3.42

On 06/07/07, Meryl Silverburgh  wrote:
...
On 7/4/07, eg  wrote:
...
Meryl Silverburgh wrote:
...
Hi,
Can you please tell me how can I use  boost iostream with zlib to
inflate an byte stream?
Where can I find an example?
The library docs have some examples in them.
See:
http://boost.org/libs/iostreams/doc/index.html
Navigate to the Quick Reference and click on the
"basic_zlib_decompressor" filter link. At the bottom of the page you
will see an example.
I am having problems in compiling the example in the boost iostreams
exmaple:
code:
#include <fstream>
#include <iostream>
#include 
#include 
#include 
int main()
{
    using namespace std;
ifstream file("hello.z", ios_base::in | ios_base::binary);
    filtering_streambuf<input> in;
    in.push(zlib_decompressor());
    in.push(file);
    boost::iostreams::copy(in, cout);
}
error:
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/boostTest.d"
-MT"src/boostTest.d" -o"src/boostTest.o" "../src/boostTest.cpp"
../src/boostTest.cpp:18:2: warning: no newline at end of file
../src/boostTest.cpp: In function 'int main()':
../src/boostTest.cpp:13: error: 'filtering_streambuf' was not declared
in this scope
../src/boostTest.cpp:13: error: 'input' was not declared in this scope
../src/boostTest.cpp:13: error: 'in' was not declared in this scope
../src/boostTest.cpp:14: error: 'zlib_decompressor' was not declared
in this scope
make: *** [src/boostTest.o] Error 1
...
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-- 
Regards,
Ron Lau

Life is wonderful because there are variables and unknowns.