Re: [Boost-users] boost::asio::buffer exception

Subject: Re: [Boost-users] boost::asio::buffer exception
From: Lloyd Kanakkassery (lloydkl.tech_at_[hidden])
Date: 2010-11-13 01:00:24

Thanks, it helped...

On 11/12/10, Bill Somerville <bill_at_[hidden]> wrote:
> Lloyd Kanakkassery wrote:
>> Hi,
>>
>> I want to write some data using boost::asio::write(). write() has two
>> arguments, one is the stream to which the data to be written and the
>> other is the data buffer. The data buffer can be created using
>> boost::asio::buffer() function. When I use it this way it works. Then,
>> I have tried to wrap boost::asio::bufffer() in my custom function like
>> this
>>
>> boost::asio::const_buffers_1 MyBuffer(string msg)
>> {
>> 	return
>> boost::asio::const_buffers_1(boost::asio::const_buffer(msg.c_str(),msg.length()));
>> }
>>
>> The I use this in my asio::write() as
>>
>> booost::asio::write(mySocket, MyBuffer("hai"));
>>
> You are passing a string by value to your function and returning a
> pointer to its guts. The string needs to have at least as long a
> lifetime as the write operation.
>> This program compiles and runs but it throws an exception called "The
>> system detected an invalid pointer address in attempting to use a
>> pointer argument in a call". I understand that, it is associated with
>> the MyBuffer() function. I have checked it with the buffer() function
>> available in "buffer.hpp". Both are written in the same way, but my
>> function is throwing exception. Could you give some hint?
>>
>> Thanks and Regards,
>>   Lloyd
>>
> HTH
> Bill Somerville.
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