Finding documentation for a type library in Java

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Finding documentation for a type library
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Double-clicking the name of a type library opens the library inspector window, which shows all the objects defined in the type library. Many types of objects are shown, but we describe in the following list only the sections of interest to ColdFusion developers: Enums: Often, in documentation for a COM object, you see example code such as the following:
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myTidyObj.CharEncoding = ascii;
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This is confusing, however, because ascii is not the name of a ColdFusion variable; rather, it is the name of an enumerated constant defined in the type library. These groups of enumerated constants are defined in this section of the library inspector. ColdFusion can t recognize these constant names, so you must use the library inspector to look up ascii, as shown in Figure 29-4.
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Part V Integrating ColdFusion MX with Other Technologies
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Figure 29-4: Viewing enumerated constants by using the library inspector. You can see in the figure that the numeric equivalent to ascii is 1, so your ColdFusion code would look as follows:
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myTidyObj.CharEncoding = 1;
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Interfaces: This is a list of all the interfaces implemented in this type library. Expanding one of these interfaces gives you a list of the properties and/or methods exposed by the interface; see the section Interpreting method and property definitions, later in this chapter, for information on interpreting the property and method definitions. Dispinterfaces: Remember that, whenever an interface is bound to an object that implements IDispatch, it is known as a dispinterface and can be called by ColdFusion. As such, any of the interfaces listed in this section are callable by ColdFusion (although you must find the CLSID or ProgID first).
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Finding documentation for an interface
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If you know the name of an interface but you don t know the name of the associated type library or class, you can expand the Interfaces node in the OLEView tree to get a list of all the interfaces exposed by all the type libraries in the system. Double-clicking an interface accesses its CLSID (also called an IID) and a button to view the TypeInfo. Clicking this button opens the interface inspector window, showing you all the properties and/or methods exposed by this interface. See the following section for details on interpreting these methods and properties.
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Interpreting method and property definitions
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In inspecting the properties and methods of an interface, keep in mind that a COM developer can implement a property in two ways. The first, no longer common, is to clearly separate methods from properties, making the properties receptacles for data and the methods functions to work on those properties. The second method, which is much more prevalent and also more flexible, is to implement the properties as methods.
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COM interfaces are defined in a language known as IDL, or Interface Definition Language. Implementing an old-style property in IDL looks as follows:
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[id(0x0000008b), helpcontext(0x0001008b)] BSTR Caption;
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The id and helpcontext keywords assign numeric values to the property; BSTR is the type of the property (BSTR being the COM equivalent of a ColdFusion string); and Caption is the name of the property. As such, to assign a value to this property in ColdFusion, you would use the following syntax:
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myCOMObject.Caption = The new Caption ;
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This works, but you have no easy way to make this kind of property read-only. Worse is the fact that the Caption property can t have any intelligent logic attached to it because it s just a receptacle for data. The way that most COM objects now define their properties is with IDL, as follows:
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[id(0x0000008b), propget, helpcontext(0x0001008b)] BSTR Caption(); [id(0x0000008b), propput, helpcontext(0x0001008b)] void Caption([in] BSTR rhs);
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Instead of defining an individual property named Caption, two methods are now named Caption, one (known as a getter) that takes no arguments but returns the current value and one (known as a setter) that returns nothing and sets the new value to whatever is passed in the rhs argument. Assigning a value to this kind of property uses the following syntax:
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myCOMObject.Caption = The new Caption ;
Now wait! You re probably thinking that s the same syntax that you used in CFSCRIPT at the beginning of the chapter, and you re right. This change in the IDL is totally transparent to ColdFusion; notice the propget and propput keywords in the second snippet of IDL. Those keywords tell COM to treat these two functions as a transparent interface into the Caption property.