在VC ++编译的应用程序中使用G ++编译的DLL（插件）时会出现什么问题？ [英] What problems can appear when using G++ compiled DLL (plugin) in VC++ compiled application?

问题描述

我使用和应用程序与 Visual C ++ 编译器一起编译。它可以以 .dll 的形式加载插件。这是相当不重要的，事实是：

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这包括从 .dll 调用函数，它们返回一个指向应用程序 API 等。

我的问题是，应用程序从调用函数时可能出现什么问题。 dll ，从中检索指针并使用它。例如，我想到的是指针的大小。 VC ++和G ++有什么不同？如果是的话，这可能会导致应用程序崩溃？

我不想使用Visual Studio IDE（这不幸是使用Applications SDK的首选方法）。我可以将G ++配置为像VC ++一样编译吗？

PS：我使用MINGW GNU G ++

解决方案

只要应用程序和DLL都在同一台机器上编译，并且只要它们只使用C ABI，就应该没问题。
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你当然不能做的是共享任何类型的C ++构造。例如，您不得在主应用程序中使用 new [] 数组，并让DLL delete [] 它。这是因为没有固定的C ++ ABI，因此任何给定的编译器都无法知道不同的编译器如何实现C ++数据结构。这对于MSVC ++的不同版本来说也是如此，它们不是ABI兼容的。

I use and Application compiled with the Visual C++ Compiler. It can load plugins in form of a .dll. It is rather unimportant what exactly it does, fact is:

This includes calling functions from the .dll that return a pointer to an object of the Applications API, etc.

My question is, what problems may appear when the Application calls a function from the .dll, retrieves a pointer from it and works with it. For example, something that comes into my mind, is the size of a pointer. Is it different in VC++ and G++? If yes, this would probably crash the Application?

I don't want to use the Visual Studio IDE (which is unfortunately the "preferred" way to use the Applications SDK). Can I configure G++ to compile like VC++?

PS: I use MINGW GNU G++

解决方案

As long as both application and DLL are compiled on the same machine, and as long as they both only use the C ABI, you should be fine.

What you can certainly not do is share any sort of C++ construct. For example, you mustn't new[] an array in the main application and let the DLL delete[] it. That's because there is no fixed C++ ABI, and thus no way in which any given compiler knows how a different compiler implements C++ data structures. This is even true for different versions of MSVC++, which are not ABI-compatible.

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