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 ========== ______________________________________ Scanned and protected by Email scanner