Iterating over the members of a class?
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From: Peter Olcott on 9 Aug 2010 16:55 Iterating over the members of a class? Is there any way to do this? -- 100% Accurate Display Screen OCR http://www.OCR4Screen.com
From: Trevor Sullivan on 9 Aug 2010 22:43 Your question is too vague to completely understand where you're going with it. Yes, it's possible to, for example, iterate over the members of a .NET class using PowerShell. It is also possible to iterate over WMI properties and methods of a particular WMI class using VBscript or PowerShell. What type of "classes" are you trying to iterate over, and what are you ultimately trying to achieve? Cheers, Trevor Sullivan Consultant | 1E Inc. On 8/9/2010 3:55 PM, Peter Olcott wrote: > Iterating over the members of a class? > Is there any way to do this? > >
From: Peter Olcott on 9 Aug 2010 23:08 On 8/9/2010 9:43 PM, Trevor Sullivan wrote: > Your question is too vague to completely understand where you're going > with it. Yes, it's possible to, for example, iterate over the members of > a .NET class using PowerShell. It is also possible to iterate over WMI > properties and methods of a particular WMI class using VBscript or > PowerShell. > > What type of "classes" are you trying to iterate over, and what are you > ultimately trying to achieve? I am talking about iterating over the members of a VBScript class, using VBScript. Can this be done? > > Cheers, > Trevor Sullivan > Consultant | 1E Inc. > > On 8/9/2010 3:55 PM, Peter Olcott wrote: >> Iterating over the members of a class? >> Is there any way to do this? >> >> > -- 100% Accurate Display Screen OCR http://www.OCR4Screen.com
From: ekkehard.horner on 10 Aug 2010 03:58 Peter Olcott schrieb: > Iterating over the members of a class? > Is there any way to do this? > > Other script languages - e.g. Perl or Javascript - use enhanced collections to organize the class members. That makes it easy to loop over them. VBScript classes in this respect are more like C structs. Such languages (C++, Java, or C#) have features like introspection or pointers/references that make it at least possible to write iterators for member access; it would even be feasible by using inheritance from a class/interface. VBScript has no introspection, no references to plain data elements, and no inheritance. So you picked the worst language for your purpose. The answer to "Is there any way to do this?", however, is "yes". If you have lots of time to spend, are willing to pay a price of reduced efficiency, and like work hard against the grain of language to get what other languages offer for free, you could (a) write wrapper/boxing classes for all simple data types (b) collect the elements of your classes into arrays (efficient) or dictionaries (less work) (c) add boilerplate code to each class that gives access the elements singularily (one level of indirection) o.member ==> o.Properties_( "member" ) ==> o.Properties_( MEMBER ) ' num constant (d) make .Properties_ accessible for the loops
From: Peter Olcott on 10 Aug 2010 06:41 On 8/10/2010 2:58 AM, ekkehard.horner wrote: > Peter Olcott schrieb: >> Iterating over the members of a class? >> Is there any way to do this? >> >> > Other script languages - e.g. Perl or Javascript - use enhanced > collections to organize the class members. That makes it easy to > loop over them. VBScript classes in this respect are more like C > structs. Such languages (C++, Java, or C#) have features like > introspection or pointers/references that make it at least possible > to write iterators for member access; it would even be feasible by > using inheritance from a class/interface. VBScript has no introspection, > no references to plain data elements, and no inheritance. So you picked > the worst language for your purpose. > > The answer to "Is there any way to do this?", however, is "yes". If > you have lots of time to spend, are willing to pay a price of reduced > efficiency, and like work hard against the grain of language to get > what other languages offer for free, you could > > (a) write wrapper/boxing classes for all simple data types > > (b) collect the elements of your classes into arrays (efficient) > or dictionaries (less work) > > (c) add boilerplate code to each class that gives access the elements > singularily (one level of indirection) > > o.member ==> o.Properties_( "member" ) > ==> o.Properties_( MEMBER ) ' num constant > > (d) make .Properties_ accessible for the loops > > This sort of thing was my plan. I was looking to see if there was an easier way. If VBScript already stored its class members in an array, and this array was directly accessible, then what I need to do would have been easier. It has to be an interpreted language. It has to be able to use and create ActiveX components. It has to have classes. Ideally it should be universally available (at least on Windows platforms) at no cost. The language should have minimal learning curve/development time cost. My current plans are to implement the design in VBScript, and adapt it so that it can be applied to every language that can use and create ActiveX components including compiled languages. -- 100% Accurate Display Screen OCR http://www.OCR4Screen.com
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