dll 在 VS2010 项目中工作正常，但在 VS6 应用程序中出现访问冲突 [英] dll works fine in a VS2010 project but gives access violations in a VS6 Application

问题描述

过去几周我一直在为 USB 设备创建一个 dll，该设备带有自己的 dll，我用来在 VS2010 中创建自己的 dll，然后我创建了一个测试应用程序，该应用程序在 2010 年使用该 dll让它工作.它运行良好，但是我现在需要在 VS6 项目中使用它，当我使用它时，我遇到了访问冲突，我在 VS6 中重新创建了 dll 以查看是否有帮助，它允许我尽快进入代码它在我的 dll 中调用了 3rd 方 dll 的一行，它导致访问冲突，我刚刚尝试创建一个工厂函数来为我的 dll 创建一个抽象接口，但我再次遇到访问冲突.我是 dll 的新手，我完全没有想法，帮助或洞察力将非常有用...

I have been creating a dll for a usb device over the past few weeks, the device came with its own dll which i used to create my own dll in VS2010, I then created a test application which uses said dll in 2010 to get it working. It works well, however I now need to use it in a VS6 project, when i use it I get access violations, I recreated the dll in VS6 to see if that would help, it allowed me to step into the code, as soon as it gets to a line in my dll that calls the 3rd party dll, it causes an access violation, I have just tried creating a factory function to create a abstract interface to my dll but I again get access violations. I am new to dlls and am completely out of ideas, and help or insight would be greatly appritiated...

推荐答案

获得使用更高版本的 Visual Studio 创建的 DLL 以与 Visual Studio 6 一起使用的方法是按照通用方式对 DLL 进行编码传递和返回到 DLL 导出函数的参数.

The way you can get a DLL created with a later version of Visual Studio to work with Visual Studio 6 is to code your DLL in a generic way in terms of parameters passed and returned to the DLL's exported functions.

例如，Windows API 描述了某些变量类型.这些类型包括DWORD、LONG、BOOL、DWORD_PTR等，包括各种字符串指针类型，如LPCSTR.此列表中还包括指向这些不同类型的指针，例如 LPLONG、LPBYTE、LPVOID 等.

For example, the Windows API describes certain variable types. These types include DWORD, LONG, BOOL, DWORD_PTR, etc. Included are the various string pointer types such as LPCSTR. Also included in this list are pointers to these various types such as LPLONG, LPBYTE, LPVOID etc.

如果您的 DLL 的导出函数传递或返回的类型不是上述类型之一，那么您就会陷入困境——该 DLL 只能在使用相同版本的 Visual Studio 构建的应用程序中安全使用DLL 是用它构建的.

If your DLL's exported functions passes or returns a type that isn't one of the above, then you're stuck -- the DLL can only be used safely in an application that was built with the same version of Visual Studio that the DLL was built with.

例如，如果您要传递 C++ 对象(标准库对象，甚至您自己的对象)，如果您希望该 DLL 在多个版本的 Visual Studio 中工作，这是一个很大的禁忌.

For example, if you're passing C++ objects (standard library objects, or even your own objects), that is a big no-no if you want that DLL to work across several versions of Visual Studio.

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