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Several information services are provided by Aspen for use by client software. A complete understanding of what these services provide, when they should be used, and how they interrelate is essential to design an application that can use the Aspen API effectively.
Services are invoked by use of the AspenRequest() function (described on page 48). A service may require a set of input information, a set of output information, both, or neither. The input and output information is typically conveyed by the use of pointers to data structures.
Each heading in this section is a parameter for the second argument of AspenRequest(). Each ‘call syntax’ heading gives (in bolded type) the actual identifier for the service being described. With the exception of ASPEN_OpenSession service, all services operate in the context of a specific open session.
The open session in the examples that follow is identified by the first, or session, parameter passed to AspenRequest(). For the sake of clarity, the open session is identified by the GLOBAL_Session variable in the examples of each service.
The following service requests are currently supported by the Aspen API:
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