Access to NCBI data
This chapter describes access to the NCBI data using the NCBI C++ Toolkit.
Object Manager: Generic API for retrieving and manipulating biological sequence data
The information about Object Manager library is here.
E-Utils: Access to Entrez Data
The base class for all requests is CEUtils_Request. Derived request classes provide Get/Set methods to specify arguments for each request. The returned data can be read in several ways:
**Read()** - reads the data returned by the server into a string.
**GetStream()** - allows to read plain data returned by the server.
**GetObjectIStream()** - returns serial stream for reading data (in most cases it’s an XML stream).
CEUtils_ConnContext allows transferring EUtils context from one request to another. It includes user-provided information (tool, email) and history data (WebEnv, query_key). If no context is provided for a request (the ctx argument is NULL), a temporary context will be created while executing the request.
Most requests return specific data types described in EUtils DTDs. The C++ classes generated from the DTDs can be found in include/objtools/eutils/
An example of using EUtils API can be found in sample/app/eutils/eutils_sample.cpp.