Constructor Arguments in VBScript!

     

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Our Class Inheritance Parser has just received a major update. Among the changes is the support for Constructor Arguments.

Most programming languages allow you to pass parameters when you create an instance of your class. These are called constructor arguments. VBScript’s constructor (the Class_Initialize sub) can not receive parameters, so usually we must resort to solutions as a “Build” or “Start” sub, in addition to the actual constructor, in order to relay the parameters.

Well, No more! The class parser allows support for constructor arguments in the most native and fluent manner.

Class inheritance in VBScript – Now at your doorstep!

     

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VBScript’s lack of class inheritance can be quite problematic for those of us who are using Classes regularly throughout our scripts. The attached file provides a parser which enables you to effectively use class inheritance in VBScript by placeing ‘ ParentClassName comments within your classes. The mechanism will:

1. Enable inheritance from multiple parents (just use multiple lines with Inherit comments)
2. Copies Properties, Variables, Functions and methods from the parent class to the derived class.
3. In case the derived class already has a code segment with the same name, the copied code-segment is changed to MyBase_. Inner segment placements are updated accordingly.
4. Enables inheritance through multiple hierarchies (e.g. GrandParent->Parent->Child inheritance). Circular inheritance protection. The order of appearance in the files is irrelevant, the parser will make sure the parent classes are parsed before their derived classes.
5. The parser has a major downside – as the technique uses ExecuteGlobal to load the processed classes into QTP, you cannot debug the code in mid-run.

Secret Methods of QTP Objects

     

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I’ve been doing some digging into QTP’s test-objects, hoping to find some undocumented methods and techniques. Armed with the power of PDM.DLL, I’ve explored each test object, and have come up with these interesting results, all of which don’t show up on your regular intellisense autocomplete.