dll错误:试图读取或写入受保护的内存

下面是我的c++代码:

ExportAPI.cpp

extern "C"
{
    EXPORT_API int test(int a, int b){
        return a*b;
    }
    EXPORT_API bool InitializeApplication( HWND hwnd)
    {
        CCEGLView::SetParentHwnd(hwnd);
        CCApplication::sharedApplication()->run();
        return true;
    }
}

c#:

public partial class MainWindow : Window
    {
      [DllImport("libcc.dll", CallingConvention=CallingConvention.Cdecl)]
      public static extern bool InitializeApplication(IntPtr hwnd);
    [DllImport("libcc.dll", CallingConvention = CallingConvention.Cdecl)]
    public static extern int test(int a, int b);
    public MainWindow()
    {
        InitializeComponent();
        Loaded += MainWindow_Loaded;
        Closed += MainWindow_Closed;
    }
    void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        Window window = Window.GetWindow(this);
        var wih = new WindowInteropHelper(window);
       Debug.WriteLine(Multiply(3, 4).ToString()); //this runs
        InitializeApplication(wih.Handle); //this gives error
    }
}

所以基本上我要做的是将WPF窗口设置为我的c++应用程序的父窗口(我在.dll中"打包")。但是当我运行时，我得到"附加信息:试图读取或写入受保护的内存。"这通常表明其他内存已损坏。"

对不起，我的英语不好。任何帮助都非常感谢!