Registers a method that handles Microsoft UI Automation events. In the JAWS script language, When a parameter is passed by reference, it must be done using a call to one of the reference functions: IntRef, StringRef, or IDispatchRef.įinally, arrays may be used in ForEach loops as follows:īool AddAutomationEventHandler( EventID, FSUIAElement, TreeScope ) Throughout this document, the term “ByRef” is used to indicate those parameters which need to be passed to a function by reference. This is a way of returning multiple pieces of information from a single function call. Therefore, after calling a function that takes a parameter by reference, the value of the parameter may have changed. When a parameter is passed to a function “by reference,” the value of the parameter is not only passed to the function, but also returned from the function. These types are used to indicate the intended values of certain parameter, return, and property types from here on.
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In the file, each of the types listed below is preceded by a comment containing the name of the type in order to make them easy to reference from this document. For JAWS scripters, these types are declared in the file UIA.jsh. These represent various element types, property types, pattern identifiers, and so on. There are several sets of pre-defined integer values used by UI Automation methods and properties. But even if you don’t know that a variant is a certain type like a string, you can still pass it to functions which take the string type. For example: if the GetProperty function returns a variant, but you know the type of the property returned will be a string, you can assign the return value directly to a string variable, rather than having to declare a variant. If you happen to know the type of a given variant, you can declare the variable as the known type in the scripts. For example, if you request the name property of a UIA element and the return type is a variant, the underlying type will almost certainly be a string. You can use the JAWS built-in script function GetVariantType to determine the type of a variant, although you may already know the underlying type based on the context. Variants may be an int, string, handle, or object, and they can be used like any of these types. In the JAWS script language, a “variant” is a variable whose type is unknown at compile-time. The term “bool” is used throughout the remainder of this document to indicate an integer value where zero (0) represents a Boolean value of false and any non-zero value represents a Boolean value of true. The “Bool” TypeĪt present, the JAWS script language has no Boolean type. Using this approach should make most situations efficient while keeping the API as simple as possible. Several of the most commonly requested element and pattern properties are requested to be cached and the cached values are always checked before the uncached values. The JAWS UIA Script API handles UIA’s caching mechanism internally.
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Those familiar with UIA will know that clients may request element and pattern data be cached in order to improve system performance. In the UIA Script API, all properties are get-only, except those for which “get/put” is explicitly declared in this document. You can create as many FSUIA objects as you like, although you probably won’t need that many. Var object myObject = CreateObjectEx ("FreedomSci.UIA", false, "UIAScriptAPI.x.manifest" ) To get an FSUIA object in scripts, use the JAWS built-in function CreateObjectEx as follows: Using this object, you can get other objects that represent UIA elements, get tree walkers which will allow you to traverse the tree of UIA elements, register for UIA events, and more.
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The primary object in the JAWS UIA script API is FSUIA. Please consult the Microsoft documentation to find out which UIA interfaces, methods, and properties are supported in which versions of Windows.Īll the objects, methods, properties, and events described in this document are available as of JAWS.
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Many of the methods and properties described in this document are supported in Windows 7, most in Windows 8 and Windows 8.1, and all in Windows 10.
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With each version of Windows®, Microsoft extends the features provided by UI Automation. This document describes the objects, methods, properties, and events available through the JAWS UIA Script API. You can find detailed information about UIA on the Microsoft web site. The JAWS UIA Script API provides access to Microsoft’s User Interface Automation (UIA) infrastructure via the JAWS script language.