C++ dll的C#包装器; "运行时检查失败#0 - ESP的值未在函数调用中正确保存." 错误

Question

这是C++ DLL中的代码:

extern "C" _declspec(dllexport) int testDelegate(int (*addFunction)(int, int), int a, int b)
{
    int res = addFunction(a, b);
    return res;
}

这是C#中的代码:

public delegate int AddIntegersDelegate(int number1, int number2);

public static int AddIntegers(int a, int b)
{
  return a + b;
}

[DllImport("tester.dll", SetLastError = true)]
public static extern int testDelegate(AddIntegersDelegate callBackProc, int a, int b);

public static void Main(string[] args)
{
  int result = testDelegate(AddIntegers, 4, 5);
  Console.WriteLine("Code returned:" + result.ToString());
}

当我启动这个小应用程序时,我从这篇文章的标题中得到消息.有人可以帮帮忙吗？

提前致谢,

d

Answer 1

Adam是正确的,你在32位版本的Windows上的调用约定上存在不匹配.函数指针默认为__cdecl,委托声明默认为CallingConvention.StdCall.当委托调用返回时,不匹配会导致堆栈指针无法正确恢复,从而在C/C++代码的调试版本中触发诊断.

要在C/C++端修复它:

typedef int (__stdcall * Callback)(int, int);

extern "C" _declspec(dllexport) int testDelegate(Callback addFunction, int a, int b)
{
    int res = addFunction(a, b);
    return res;
}

要在C#端修复它:

    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
    public delegate int AddIntegersDelegate(int number1, int number2);