ope wrote:

Hi,

I've the following code:

namespace io = boost::iostreams;

bool foo::open( const std::string& file ) { io::filtering_istream is;

is.push( my_line_filter() ); is.push( io::file_source( file ) );

// ??? how to check success

do { std::string line; std::getline(is, line); std::cout << line << std::endl; } while (!is.eof());

return true; }

Well, how can I check that the file is opened correct/the stream is valid? is_open() and good() seems not supported? Or I'm wrong? Giving a wrong name does nothings.

Use file_source::is_open() (http://tinyurl.com/29o2wm). You can call it before adding the filter to the chain: file_source src(file); if (!is_open(src)) { ... } ... is.push(src); or after adding it (http://tinyurl.com/2cmlke): is.push(my_line_filter()); is.push(file_source(file)); if (!is.component(1).is_open()) .... Here 1 is the offset of the file_source in the filter chain.

Thanks, Olaf

-- Jonathan Turkanis CodeRage http://www.coderage.com