“尝试读取或写入受保护的存储器”从 C++/CLI 包装器 dll 传递本机对象时出错
我有一个带有接口的大型 C++ 项目。 我构建了一个 C++/CLI 包装器 dll 以便与项目进行通信。
它由托管类构建，每个托管类都保存对本机对象和函数包装器的引用。该项目有一个工厂方法，创建一个对象并将其作为抽象类返回，主对象继承（我们称之为 IObject）。
在 C++ 中调用工厂函数“createObject”时，一切正常。此外，在 C++/CLI 中，对象会返回并正常工作。但在 C# 中，在两个 DLL 都存在并且程序引用托管 DLL 后，当我到达托管 DLL 的“createObject”函数时，程序在运行时崩溃，并显示：
“System.AccessViolationException”类型的未处理异常 发生在wrapper.dll中
附加信息：尝试读取或写入受保护的内存。 这通常表明其他内存已损坏。
这看起来不像是一个封送问题，因为它应该只返回指向本机对象的指针。
我尝试创建返回一些结构和字符串的工厂函数，一切正常。
我认为可能会发生这种情况，因为工厂函数返回的抽象类对象（IObject）比对象本身（Object - 继承自它）小，因此该对象包含的数据比 IObject 应该包含的数据多。但这就是工厂模式的工作原理！我看不出还有什么办法。
提前致谢。
I have a big C++ project with an interface.
I built a C++/CLI wrapper dll in order to communicate with the project.
It is built of managed classes, each holding a reference to a native object and functions wrappers. The project has a factory method creating an object and returning it as an abstract class, the main object inherits (lets call it IObject).
When calling the factory function "createObject" in C++ everything works well. Also in C++/CLI the object is returned and work properly. But in C#, after both of the DLLs are present and the managed one is referenced by the program, when I get to the managed DLL's "createObject" function the program crashes at runtime, saying:
An unhandled exception of type 'System.AccessViolationException'
occurred in wrapper.dllAdditional information: Attempted to read or write protected memory.
This is often an indication that other memory is corrupt.
It doesn't seem like a marshaling issue, since it should only return a pointer to a native object.
I tried creating factory functions returning some structs and strings, and everything worked well.
I thought it might happen because the abstract class object (IObject) returned by the factory function is smaller than the object itself (Object - which inherits from it), so the object contains more data than the size of IObject should. But this is how factory patterns work! I see no other way.
Thanks in advance.
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我的猜测是你的 C++ 代码中的某个地方有一个错误的指针。在C++中调用时，它不关心，但在C#中调用时，它更多地保护内存。
只是一个猜测，但希望它指向正确的方向。
My guess is that you have a bad pointer in your C++ code somewhere. When calling in C++, it doesn't care, but when calling in C#, it protects the memory more.
Just a guess, but hopefully it's pointing in the right direction.