Question

我在C ++中有一个本机回调函数，让我们这样说：

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

现在我还有另一个本机功能：

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，现在我调用了一个托管函数，并为该函数提供了本机c ++函数。让我们看一下托管代码：

// 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，如果我对此进行调试，则会收到一条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。

调用约定有问题吗？

谢谢

Answer 1

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

Access violation reading location 0xfffffffffffffff8.

在托管类中调用非托管函数时，C ++ / CLI System.AccessViolationException

1 个答案: