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c++ - 在托管类中调用非托管函数时出现 C++/CLI System.AccessViolationException

问题描述

我在 C++ 中有一个本机回调函数，让我们这样说：

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

现在我有另一个本机功能：

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);
}

好的，所以现在我调用了一个托管函数并给这个函数一个本地 c++ 函数。让我们看看托管代码：

// 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，如果我调试它，我会收到一条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.错误消息。

可能是调用约定有问题吗？

谢谢

标签： c++c++-cli

解决方案

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);
    }

回调的东西有效，但在本机主程序中仍然出现错误：

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，我的 Visual Studio 2010 在调试回调时崩溃（在我的 C++/CLI 包装器中）。如果我等待的时间足够长，它会引发以下异常：

Access violation reading location 0xfffffffffffffff8.

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