如何使用在Delphi中由dll导出的C ++类 [英] How to use C++ Classes exported by a dll in Delphi

问题描述

有没有办法使用由win32 dll导出的C ++类在Delphi for win32？有没有其他方法来养成类似的东西（COM，.NET，...）？

is there a way to use C++ classes exported by a win32 dll in Delphi for win32? Are there other ways to archieve similar things (COM, .NET, ...)?

推荐答案

类。您只能导入功能。 Rudy Velthuis详细介绍了该主题。虽然您不能直接使用导出的C ++类，但他描述一对夫妇的技术来实现相同的效果：

You can't import a class. You can only import functions. Rudy Velthuis has written at length on the topic. Although you can't directly use an exported C++ class, he describes a couple of techniques to achieve the same effect:

• Flatten对象，所以在调用端没有对象现在只是一个指针，它被传递给DLL和一系列包装对象方法的函数的参数。编写包装器非常简单，虽然很繁琐。

• "Flatten" the object, so on the calling side there is no object anymore, just a pointer that gets passed to the DLL along with other parameters for a series of functions that wrap the object's methods. Writing the wrapper is very simple, although it can be tedious.

使用纯虚拟类。 Windows C ++编译器和Delphi通常具有相同的VMT布局，因此如果C ++类可以通过纯虚拟方法列表描述，您可以创建一个等效的Delphi声明，使用DLL返回的对象指针进行一些类型转换，

Use pure virtual classes. Windows C++ compilers and Delphi have generally the same VMT layouts, so if the C++ class can be described by a list of pure virtual methods, you can create an equivalent Delphi declaration, do some type-casting with the object pointer returned by the DLL, and proceed.

文章中提供了两种方式的完整示例。

Complete examples of both ways are given in the article.

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