Re: [boost] iostreams and binary memorystreams

From: Atry (pop.atry_at_[hidden])
Date: 2007-05-03 01:20:40

Edwin Vane 写道:
> Hi,
>
> I'd like to create an iostream that writes data in binary format to a 
> pre-allocated block of memory. I'm already using array_sink to handle 
> the 'write to a pre-allocated block of memory' part:
>
>   char* my_data = new char[1024];
>
>   io::stream_buffer<io::array_sink> buf(my_data,1024);
>   std::ostream os(&buf);
>
>   int i = 15;
>   float f = 5.1345;
>   os << i;
>   os << f;
>   os << "Hello World!";
>   os << 'c';
>
> However, all the data written to my_data is in text format (i.e. 15 is 
> encoded in 2 bytes 0x31 0x35 instead of 4 (assuming 32-bit integers)). 
> What I'd like is something like file_sink where you specify the mode as 
> binary. The 'mode' seems to be a Device-level decision (as it is with 
> basic_file_sink) so I'm guessing array_sink is not what I need afterall. 
> Does something exist for writing binary data to a block of memory?
>
>   
Please use Boost.Serialize.