I know how to implement custom fuction into RAP but I wondered if there was a way to declare type too. For example, is there a way for me to declare and use an array of variants under the calc tab ?
You can however use a TList or TStringList. And you can declare new classes and make RAP aware of them via RTTI (see number 2 in the article below). Therefore you could create a class that manages a list of variants or strongly typed collection of objects.
There are two very simple and powerful techniques to extend the capabilities of RAP infinitely. These are summarized below and covered in more detail in the RAP.hlp online help. Demos and tutorials are installed to RBuilder\Demos\RAP. The tutorial text is located in RAP.hlp.
1. RAP Pass-Through Functions
These are functions that appear in the Language tab of RAP's Code Toolbox. These functions are written in Delphi and can be called from RAP. RAP's pass-through function architecture enable's developers to add new built-in functions to RAP's code toolbox.
2. Extend RAP's RTTI
RAP's Run-time Type information defines what classes and properties can be accessed via RAP. By default the published properties of any class that is registered with Delphi's RegisterClass procedure is recognized by RAP. In addition many of the public properties and methods of ReportBuilder classes are exposed.
Comments
RAP does not contain support for arrays.
You can however use a TList or TStringList. And you can declare new classes
and make RAP aware of them via RTTI (see number 2 in the article below).
Therefore you could create a class that manages a list of variants or
strongly typed collection of objects.
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Article: Extending RAP
---------------------------------------------------
There are two very simple and powerful techniques to extend the capabilities
of RAP infinitely. These are summarized below and covered in more detail in
the RAP.hlp online help. Demos and tutorials are installed to
RBuilder\Demos\RAP. The tutorial text is located in RAP.hlp.
1. RAP Pass-Through Functions
These are functions that appear in the Language tab of RAP's Code Toolbox.
These functions are written in Delphi and can be called from RAP. RAP's
pass-through function architecture enable's developers to add new built-in
functions to RAP's code toolbox.
2. Extend RAP's RTTI
RAP's Run-time Type information defines what classes and properties can be
accessed via RAP. By default the published properties of any class that is
registered with Delphi's RegisterClass procedure is recognized by RAP. In
addition many of the public properties and methods of ReportBuilder classes
are exposed.
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Nard Moseley
Digital Metaphors Corporation
http://www.digital-metaphors.com
Best regards,
Nard Moseley
Digital Metaphors
www.digital-metaphors.com