Aspen Touch Solutions ATM-123R Series Specifikace stáhnout pdf (Strana 90)

3-6 Data Types

3-6

3.2.2 Implementing an

Interface Through a

Custom Interface

An extension can also be implemented by overloading the

Custom interfaces defined for the extension. For example, an

extension Unit Operation can be created by overloading the

ExtensionObject interface and the ExtnUnitOperation interface.

When an extension is created in this manner, all methods of the

interface must be overloaded (this is a requirement of the C++

language definition). If a method does not contain any

functionality, however, the error condition E_NOTIMPL should be

returned to indicate to HYSYS that the method is not being

used. Using the Extension Unit Operation as an example once

again; each of the methods in its two supported interfaces must

be overloaded, but only the Initialize and Execute methods need

return anything other than E_NOTIMPL.

3.3 Data Types

This documentation for the most part uses Visual Basic syntax in

its sample code and examples. The following table provides a

map of Visual Basic types to C++, .NET, C#, and VB.NET types.

Visual Basic Type C++ Type .NET Type C# Type VB.NET Type

Variant VARIANT System.Object object Object

String BSTR System.String string String

Boolean VARIANT_BOOL System.Boolean bool Boolean

Long long System.Int32 int Integer

Integer short System.Int16 short Short

Double double System.Double double Double

Single float System.Single float Single

arrays SAFEARRAY System.Array Array or specific

(string[], int[],

double[])

Array or specific

(string(), int(),

double())

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Aspen Touch Solutions ATM-123R Series Specifikace Strana 90