Hi,
From my research on Iostream devices, I cannot understand why my read() statement's 'count' parameter is receiving a value of 4096. For example, I've implemented a seekable_device_tag category device that provides direct binary disk access. My stream is defined as follows:
typedef boost::iostreams::stream<DiskDevice> DiskStream; DiskStream stream; char* buffer; // assume this is a valid buffer stream.read( buffer, 8 ); The code above (at least to me) should be reading in 8 char's (bytes) of data from the stream. However, if I set a break point in DiskDevice::read(), the second parameter (named count) receives a value of 4096, which eventually gets passed into fread() and causes an exception. I also noticed that boost::iostreams::stream derives from the standard streams, which I imagine is causing the problems. For direct binary disk access, should I avoid boost.iostreams all together? I don't like that boost::stream is going through std::iostream::read() before reaching my device's read function. Perhaps, also, I am misunderstanding Boost.Iostreams. Please clarify. Thanks.