Re: [Boost-users] asio::async_write

Subject: Re: [Boost-users] asio::async_write
From: ipangth (ipangth_at_[hidden])
Date: 2009-11-18 01:30:01

handler must be:

* @code void handler(
 *   const boost::system::error_code& error, // Result of operation.
 *
 *   std::size_t bytes_transferred           // Number of bytes written from the
 *                                           // buffers. If an error occurred,
 *                                           // this will be less than the sum
 *                                           // of the buffer sizes.
 * ); @endcode

2009/11/18 Lloyd <lloyd_at_[hidden]>:
>
> Hi,
>
> I have been trying very hard to "compile" this code. What is the reason for
> the compilation errors in the "async_write" call.
>
> #include <boost/bind.hpp>
> #include <boost/enable_shared_from_this.hpp>
> #include <boost/asio.hpp>
> using boost::asio::ip::tcp;
>
> class aa
> {
> public:
>        void testme()
>        {
>                char a[20]="<test data>";
>                boost::asio::io_service io;
>                tcp::socket s(io);
>                boost::asio::async_write(s,boost::asio::buffer(a,sizeof(a)),
>
>  boost::bind(&aa::handler,shared_from_this(),boost::asio::placeholders::error));
>        }
>
>        void handler(const boost::system::error_code& error)
>        {
>        }
>
> private:
>
> };
>
>
>
> int main()
> {
>
>        aa x;
>        x.testme();
>        return 0;
> }
>
> The erros I got are:
> ====================
>
> 1>------ Build started: Project: del, Configuration: Release Win32 ------
> 1>Compiling...
> 1>del.cpp
> 1>.\del.cpp(19) : error C2780: 'void
> boost::asio::async_write(AsyncWriteStream
> &,boost::asio::basic_streambuf<Allocator>
> &,CompletionCondition,WriteHandler)' : expects 4 arguments - 3 provided
> 1>        C:\Program Files\boost140\boost/asio/write.hpp(510) : see
> declaration of 'boost::asio::async_write'
> 1>.\del.cpp(19) : error C2784: 'void
> boost::asio::async_write(AsyncWriteStream
> &,boost::asio::basic_streambuf<Allocator> &,WriteHandler)' : could not
> deduce template argument for 'boost::asio::basic_streambuf<Allocator> &'
> from 'boost::asio::mutable_buffers_1'
> 1>        C:\Program Files\boost140\boost/asio/write.hpp(453) : see
> declaration of 'boost::asio::async_write'
> 1>.\del.cpp(19) : error C2784: 'void
> boost::asio::async_write(AsyncWriteStream
> &,boost::asio::basic_streambuf<Allocator> &,WriteHandler)' : could not
> deduce template argument for 'boost::asio::basic_streambuf<Allocator> &'
> from 'boost::asio::mutable_buffers_1'
> 1>        C:\Program Files\boost140\boost/asio/write.hpp(453) : see
> declaration of 'boost::asio::async_write'
> 1>.\del.cpp(19) : error C2780: 'void
> boost::asio::async_write(AsyncWriteStream &,const ConstBufferSequence
> &,CompletionCondition,WriteHandler)' : expects 4 arguments - 3 provided
> 1>        C:\Program Files\boost140\boost/asio/write.hpp(411) : see
> declaration of 'boost::asio::async_write'
> 1>.\del.cpp(19) : error C3861: 'shared_from_this': identifier not found
> 1>Build log was saved at "file://c:\Documents and
> Settings\Administrator\Desktop\del\del\Release\BuildLog.htm"
> 1>del - 5 error(s), 0 warning(s)
> ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
>
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-- 
Best regards,
PangYongQiang