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POLoading a Delphi Object Run Time using BPL
 

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    <p>I have a class in a unit. Usually, when I changed the algorithm of its methods, I have to recompile it and deliver the patch as a whole. I think to create the instance of the class using DLL. After searching in delphi.about.com, I found that instead of using DLL, I can use BPL. It is a DLL for Delphi. The problem is almost all examples I found is only telling how to export a function. I want to dynamically load the BPL, and whenever I replace the BPL, I can get the latest algorithm of the class, not only the functions I export.</p> <p>Article I have read:<br> - <a href="http://delphi.about.com/od/objectpascalide/a/bpl_vs_dll.htm" rel="nofollow noreferrer">http://delphi.about.com/od/objectpascalide/a/bpl_vs_dll.htm</a><br> - <a href="https://stackoverflow.com/questions/1192734/plugins-system-for-delphi-application-bpl-vs-dll">Plugins system for Delphi application - bpl vs dll?</a><br> - <a href="http://delphi.about.com/library/weekly/aa012301a.htm" rel="nofollow noreferrer">http://delphi.about.com/library/weekly/aa012301a.htm</a></p> <p>Any URL or SAMPLE how to create a BPL from scratch to encapsulate a component or a class is greatly appreciated.</p> <hr> <p>Dear Guru,</p> <p>Suppose I have code like this:</p> <pre><code>unit unitA; interface type B = class(TObject) public procedure HelloB; end; A = class(TObject) public function GetB: B; function HelloA: String; procedure Help; end; implementation uses Dialogs; { B } procedure B.HelloB; begin ShowMessage('B'); end; { A } function A.GetB: B; begin Result := B.Create; end; function A.HelloA: String; begin Result := 'Hello, this is A'; end; procedure A.Help; begin //do something end; end. </code></pre> <p>I want to export all public methods of A. How to make it a DLL? How to use it from another unit where to import it? let's say:</p> <pre><code> var a: A; a := A.Create; a.GetB; showMessage(a.HelloA); </code></pre> <p>A is not declared in the unit (it is in the DLL). Please advise.</p> <hr> <p>Hurray. I got it last night. All I have to do is make the object implement an interface which is used in the caller unit to catch the instance of object returned by the DLL.</p> <p>Thank you all.</p>
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    1. COGuys, is BPL can be compared with Java Class Loader ? Is there any feature in Delphi which work similar with Class loader in Java?
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    2. CO@WishKnew: In a nutshell BPL is a DLL with extra features. this extra features help to share resources, like objets and dependances.
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