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

问题描述

在过去几个星期我一直在为usb设备创建一个dll，设备自带了自己的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，在2010年使用该dll。得到它工作。它工作得很好，但是我现在需要在VS6项目中使用它，当我使用它，我获得访问违例，我重新创建的VS6中的dll，看看是否会有帮助，它让我进入代码，尽快它得到一行在我的DLL，调用第三方DLL，它导致访问冲突，我刚刚尝试创建一个工厂函数创建一个抽象接口，我的DLL，但我再次获得访问违例。我对dll是新的，完全没有想法，帮助或洞察将非常吝惜...

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

你可以得到一个使用更高版本的Visual Studio创建的DLL来使用Visual Studio 6是以通用的方式编码你的DLL，传递的参数和返回到DLL的导出函数。

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 c $ c> DWORD_PTR 等。包括各种字符串指针类型，例如 LPCSTR 。此列表中还包括指向这些各种类型的指针，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.

如果你的DLL的导出函数传递或返回一个不是上面的类型，该DLL只能在使用与DLL构建的相同版本的Visual Studio构建的应用程序中安全地使用。

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，如果您传递C ++对象（标准库对象，甚至是你自己的对象），这是一个很大的没有，如果你想要的DLL在几个版本的Visual Studio工作。

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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