在托管类中调用非托管函数时，C ++ / CLI System.AccessViolationException [英] C++/CLI System.AccessViolationException when calling unmanaged function in managed class

问题描述

我在C ++中有一个本机回调函数，让我们这样说：

I have a native callback function in C++, let's say something like this:

void ::CallbackFunction(void)
{
  // Do nothing
}

现在我还有另一个原生函数：

Now I have another native function:

void ::SomeNativeFunction(void)
{
  m_callback = std::tr1::bind(&::CallbackFunction, m_Tcy); // save in m_callback | m_Tcy is the class where CallbackFunction exists
  m_Tcy->SomeManagedFunction(m_callback);
}

好了，所以现在我调用了托管函数，并给了该函数一个本地c ++功能。
让我们看一下托管代码：

Alright, so now I called a managed function and gave this function a native c++ function. Let's look into the managed code:

// This won't work
// typedef std::tr1::function<void __stdcall ()>* callback_function;
typedef std::tr1::function<void()>* callback_function;

callback_function m_nativCallback;

void ::SomeManagedFunction(callback_function callback)
{
  m_nativCallback = callback;
  // Does some stuff that triggers SomeManagedCallback
}

void ::SomeManagedCallback(IAsyncResult^ ar)
{
  (*m_nativCallback)();
}

现在，如果我对此进行调试，则会得到 .dll中发生类型为System.AccessViolationException的未处理异常。其他信息：试图读取或写入受保护的内存。这表示其他内存已损坏。错误消息。

Now, if I debug this, I get a An unhandled exception of type System.AccessViolationException occurred in .dll Additional information: An attempt was made to read or write in the protected memory. This is an indication that other memory is corrupted. error message.

调用约定有问题吗？

谢谢

推荐答案

本机部分设置错误：

void ::SomeNativeFunction(void)
{
  m_callback = std::tr1::bind(&::CallbackFunction, m_Tcy); // save in m_callback | m_Tcy is the class where CallbackFunction exists
  //this won't work
  m_Tcy->SomeManagedFunction(m_callback);
}

这对我有用：

void ::SomeNativeFunction(void)
    {
      m_callback = std::tr1::bind(&::CallbackFunction, m_Tcy); // save in m_callback | m_Tcy is the class where CallbackFunction exists
      //this works, even tho the debugger dies on me when I try to debug this
      m_Tcy->SomeManagedFunction(&m_callback);
    }

回调函数有效，但是在本地主函数中仍然出现错误：

The callback stuff works, but still getting a error in the native main though:

First-chance exception at 0x00007ffb2b59dd60 in *.exe: 0xC0000005: Access violation at location 0x00007ffb2b59dd60.
Unhandled exception at 0x00007ffb2b59dd60 in *.exe: 0xC000041D: Exception during a user callback.

此外，调试回调（在C ++ / CLI包装器中）时，Visual Studio 2010崩溃。如果我等待了足够长的时间，它将引发以下异常：

Also, my visual studio 2010 crashes when debugging the callback (in my C++/CLI wrapper). If I wait long enough, it throws the following exceptions:

Access violation reading location 0xfffffffffffffff8.

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