Re: [Boost-users] [boost.asio] string iterator not dereferencable using message in async_send_to

From: Ákos Maróy (akos_at_[hidden])
Date: 2008-09-02 10:35:39

John Urberg wrote:
> I'm using async_send_to to send multicast messages.  When I try to send data in
> a std::string, I always get a 'string iterator not dereferencable' assertion
> failure.  I'm using boost 1.35 and VC9.  Here's the code:
> 
> // instance variable
> string buffer;
> 
> // code in method
> buffer = BuildHailMessage();
> socket.async_send_to(
>    boost::asio::buffer(buffer),
>    endpoint,
>    boost::bind(
>       &MulticastServer::HandleSendTo, 
>       this,
>       boost::asio::placeholders::error));
> 
> I've also tried using char* buffer, dynamically allocating it based on the
> message length and then use std::copy to copy the std::string into the buffer,
> but I get heap corruption assertions when trying to delete [] it.
> 
> The only way I've gotten this to work is using a fixed char[] buffer. 
> 
> Is there a way I can use a std::string with async_send_to?  Do I need to use a
> different type of asio::buffer class?

I'm getting a similar error. Is there a fix to this issue?

Akos