在C++中使用C#类时的EEFileLoadException(win32 app)

出于部署原因,我试图使用IJW在C++中包装C#程序集,而不是使用COM Callable Wrapper.

我已经在其他项目上完成了,但是在这个项目上,我得到了一个EEFileLoadException.任何帮助,将不胜感激!

托管C++包装器代码(这是在DLL中):

extern "C" __declspec(dllexport) IMyObject* CreateMyObject(void)
{
    //this class references c# in the constructor
    return new CMyWrapper( );
}

extern "C" __declspec(dllexport)  void DeleteMyObject(IMyObject* pConfigFile)
{
    delete pConfigFile;
}

extern "C" __declspec(dllexport) void TestFunction(void)
{
    ::MessageBox(NULL, _T("My Message Box"), _T("Test"), MB_OK);
}

测试代码(这是一个EXE):

typedef void* (*CreateObjectPtr)();
typedef void (*TestFunctionPtr)();

int _tmain testwrapper(int argc, TCHAR* argv[], TCHAR* envp[])
{
    HMODULE hModule = ::LoadLibrary(_T("MyWrapper"));
    _ASSERT(hModule != NULL);

    PVOID pFunc1 = ::GetProcAddress(hModule, "TestFunction");
    _ASSERT(pFunc1 != NULL);
    TestFunctionPtr pTest = (TestFunctionPtr)pFunc1;

    PVOID pFunc2 = ::GetProcAddress(hModule, "CreateMyObject");
    _ASSERT(pFunc2 != NULL);
    CreateObjectPtr pCreateObjectFunc = (CreateObjectPtr)pFunc2;

    (*pTest)();  //this successfully pops up a message box
    (*pCreateObjectFunc)();  //this tosses an EEFileLoadException

    return 0;
}

对于它的价值,事件日志报告以下内容:.NET运行时版本2.0.50727.143 - 致命执行引擎错误(79F97075)(80131506)

不幸的是,Microsoft没有关于该错误的信息.

问题是DLL的位置.

C:\ dll文件\ managed.dll

C:\ dll文件\ wrapper.dll

C:\ EXE\my.exe

我通过将managed.dll复制到c:\ exe来确认这一点,并且它没有问题.显然,CLR不会在非托管DLL的路径中查找托管DLL,只会查找可执行文件所在的DLL.(或在GAC中).

由于不值得进入的原因,这就是我需要的结构,这意味着我需要让CLR找到托管dll.见下面的代码:

AssemblyResolver.h:

/// 

/// Summary for AssemblyResolver
/// 
public ref class AssemblyResolver
{
public:

static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
{
    Console::WriteLine( "Resolving..." );

    Assembly^ thisAssembly = Assembly::GetExecutingAssembly();
    String^ thisPath = thisAssembly->Location;
    String^ directory = Path::GetDirectoryName(thisPath);
    String^ pathToManagedAssembly = Path::Combine(directory, "managed.dll");

    Assembly^ newAssembly = Assembly::LoadFile(pathToManagedAssembly);
    return newAssembly;
}

};

Wrapper.cpp:

#include "AssemblyResolver.h"

extern "C" __declspec(dllexport) IMyObject* CreateMyObject(void)
{
    try
    {
        AppDomain^ currentDomain = AppDomain::CurrentDomain;
        currentDomain->AssemblyResolve += gcnew ResolveEventHandler( AssemblyResolver::MyResolveEventHandler );

        return new CMyWrapper( );
    }
    catch(System::Exception^ e)
    {
        System::Console::WriteLine(e->Message);

        return NULL;
    }
}

第一个问题是确保Debugger类型设置为mixed.然后你得到有用的例外.