Delphi Vcl Components

[Kayleen]

Im using Delphi 5 and I'm creating a number of panels at runtime, then creating buttons on the panels, obviously again at runtime. I need to do it this way because I may need to dynamically create more panel/button combinations in the future.

I can do all of this, but I'm at a loss as to how to reference the panels I've created, because I can't find a way to access the panels' component name. Hunting around the Internet I've found that I can use FindComponent to find the panel components by name, but I still don't know how to use that name, because I can't use a string variable to refer to it - e.g. StringVar := Panel.Name. I get a type mismatch, TComponentName versus String.

I've read on several forums (including this one) that there is no way to reference the panels by name directly. I've tried using a component array, but I strike the same problem - I need to refer to the component by its assigned component name.

You're conflating the component name with the variable name. The Delphi IDE strives to keep those two the same, for IDE-created components, but they're not necessarily equal. You don't have variable names because you're creating the components dynamically, and you don't know how many variables you'd need. However, you still have control over the component names: Simply assign the Name property of the component, and then you can use it the same way you use any other component names, by calling FindComponent. Just make sure the names are unique for each panel instance.

Remember also that the way to deal with variables, when you don't know at compile time how many you'll need, is to use arrays or lists. You can use plain old arrays, or you can use a more sophisticated data structure like TComponentList or TDictionary.

Finally, to make it easier to refer to the controls on the panels you're creating, you can dispense with the panels and use frames instead. You can visually design a TFrame in the IDE and give names to the buttons, and at run time, you can instantiate the frame class, and it will automatically create all the buttons for you, just like when you instantiate a form or data module. You only need to give a name to the new frame object, but that object will already have named fields referring to the buttons.

will change all Captions of tPanels in your application. In order to distinguish between Panels created by code and designer you can use the TAG property of each created tPanel and use it in the above example.

What's the best way to solve this? I thought about adding the "found" components to a standalone array, and then walk through that after this loop to delete them, which I think will work.... but is that the best approach?

It may not happen in your case, but the if frmMain.Components[i] is TMyClass check will also return true for descendant classes of TMyClass. If you are really looking for the removal of one specific class, you may need to add an extra check of the ClassName.

For now, a fellow member of this community has posted a workaround, although SAP cannot officially support it: -engineering.de/ads-and-delphi-10-2-tokyo/. I am not sure whether the workaround will work for ADS 11.

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In the course of some project analysis, it has become apparent that we would benefit from exporting a list of all installed components in Delphi. I have found articles discussing how to obtain the list using the ToolsAPI, but that would mean building a package for a wizard, which is more of a side project than I was seeking.

As it happens, I need to run in XE7, where the key is this: HKEY_CURRENT_USER\Software\Embarcadero\BDS\15.0\ToolForm\Mapping. I also have an interest, though no absolute need, to run this in D2007, but I find no entry in the registry for such information. Has anyone committed a web page on the variations of such content in different versions?

Which code? You posted code for use in a package. I am now scanning the registry, and collecting from there with my own code, which works fine, though there are a few idiosyncrasies in the lists there.

The point of my last post, though, was that although the registry scan is convenient, it is specific right now to XE7. And given the minor irregularities I have found in the entries there, it seems reasonable to anticipate irregularities in other versions, whether the same or different to these. In D2007, however, I find no evidence of installed components in the registry, so in the end, the ToolsAPI may be the only reliable approach.

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