由于"由于其保护级别",C#编译失败

Question

我的情况是这样的.

我有3个项目.

PrivacyDetectorDLL PDWrapper WindowsFormsApplication1(C#)

我的目标是在C#中使用Native C++类.所以我使用了C++/Cli包装类.但是我得到了保护级别的错误.我不明白.

我收到这个错误!

Error   1   'PDWrapper.PDWrapperClass.m_pCPrivacyDetectEngine' is inaccessible due to its protection level  K:\Visual Studio 2010 Project\PrivacyDetecter\WindowsFormsApplication1\Form1.cs 23

来自WindowsFormsApplication1项目的我的c#代码是这样的.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public PDWrapper.PDWrapperClass m_PDWrapper = null;

        public Form1()
        {
            m_PDWrapper = new PDWrapper.PDWrapperClass();

            unsafe
            {
                m_PDWrapper.m_pCPrivacyDetectEngine->initEngine();
            }

            InitializeComponent();
        }
    }
}

我的PDWrapper类看起来像这样.

// PDWrapper.h

#pragma once

using namespace System;

namespace PDWrapper {

    public ref class PDWrapperClass
    {
        // TODO: Add your methods for this class here.
    public :
        PDWrapperClass();
        ~PDWrapperClass();

    public :
        CPrivacyDetectEngine* m_pCPrivacyDetectEngine;
    };
}

这是我的PrivacyDetectEngine标题(来自PDWrapper项目的标题)

#pragma once
class CPrivacyDetectEngine
{
public: // my func
    CPrivacyDetectEngine(void);
    ~CPrivacyDetectEngine(void);

    void CPrivacyDetectEngine::initEngine();

    void CPrivacyDetectEngine::startEngine(char* currentPath, size_t length);

public: // my util func
    int CPrivacyDetectEngine::bytecmp(unsigned char *a, unsigned char *b, int length);
    void CPrivacyDetectEngine::extToNum(char* fileName, unsigned int* extNum);
    int CPrivacyDetectEngine::checkFileSig(unsigned char* fileSig, int sigLength, char* filePath, char** pFileInternal);
    void CPrivacyDetectEngine::parseMSDocText(char** pFileInternal, unsigned int* compSize, unsigned int* decompSize);
    char* CPrivacyDetectEngine::infData(char* pFileData, int compSize, int decompSize);
    void CPrivacyDetectEngine::privacyDetectXML(char* text, int textLength, int* pItemIndex, char* filePath);
    void CPrivacyDetectEngine::checkSocialNum(char* text);

public: // my var
    int driverCount;            
    char driverName[256];           
    unsigned int parseFileList;     
};

来自PrivacyDetectorDLL的我的PrivacyDetectEngine标题是相同的,但在类CPrivacyDetectEngine之间有__declspec(dllexport)之类的

class __declspec(dllexport) CPrivacyDetectEngine

我不知道有什么问题....有人请帮助我.

Answer 1

你的"包装"类没有完成它的工作.

C#无法访问本机C++类.这是错误的来源.指针是否存储在托管中ref class并不重要.尽管指针是公共的,但它指向的数据类型对C#是隐藏的(因为它是不兼容的).

但是有一个解决方案.C++/CLI可以很好地访问本机C++类.所以你需要的是:

public ref class PDWrapperClass
{
    // TODO: Add your methods for this class here.
public :
    PDWrapperClass();
    ~PDWrapperClass();

private:
    CPrivacyDetectEngine* m_pCPrivacyDetectEngine;

public:
    void initEngine() { m_pCPrivacyDetectEngine->initEngine(); }
};

您需要为希望C#能够调用的每个函数执行此操作.包装器不仅仅是一个指针架.在许多情况下,您可以在C++/CLI ref class中提供一种调用整个本机函数序列的方法.

但是,请考虑使用智能指针,以确保在所有情况下都释放本机对象.例如,我在codereview.se上发布了一个智能指针.如果您使用它,请尊重许可; 这些条款非常慷慨,但确实强加了一些归属要求.