rotate jpeg from blob

[Valeri Tishev]

Sorry for the off-topic, but I am wondering whether someone has come to 
such a problem.
I am extracting jpeg images from a MySQL database, using the MySQL++ 
API. The extracted images are kept in mysqlpp::sql_mediumblob, but some 
of them should be rotated before saving them to filesystem. The GDI+ API 
should do the task, but the constructor of Image class has the following 
signature: 
<http://msdn.microsoft.com/en-us/library/ms535410%28VS.85%29.aspx>
Image(IStream *stream, BOOL useEmbeddedColorManagement);
So the real question is how to get pointer to IStream from 
mysqlpp::sql_mediumblob.

Thanks in advance