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我无法修复由winscard.dll 库包装器中的SCardConnect函数导致的内存泄漏。有没有办法通过winscard.dll修复内存

总结：当SCardConnect成功返回 0 时，这意味着读卡器上有一张卡，内存就会爆炸。

细节：

我发现SCardEstablishContext也会造成内存泄漏，所以我尽量减少对该函数的使用。我也尝试使用SCardStatusChange函数，但它也会造成内存泄漏并且逻辑很复杂。

  1. 包装卡.cs：
[DllImport("winscard.dll")]
        public static extern int SCardConnect(int hContext, string szReaderName, int dwShareMode, int dwPrefProtocol, ref int phCard, ref int ActiveProtocol);
  1. 主要代码：（省略了一些全局变量）
public Form1()
        {
            InitializeComponent();

            do
            {

                if (this.Connect())
                {

                }
                else
                {

                }

            }
            while (true);
        }

public bool Connect()
    {
        if(string.IsNullOrEmpty(readername))
            try
            {
                readername = this.GetReadersList()[0];
            }
            catch(Exception e) { }


        retCode = Card.SCardConnect(hContext, readername, Card.SCARD_SHARE_SHARED,
                             Card.SCARD_PROTOCOL_T0 | Card.SCARD_PROTOCOL_T1, ref hCard, ref Protocol);
        
        if (retCode != Card.SCARD_S_SUCCESS)
        {
            return false;
        }
        else
        {
            return true;
        }       
        
    }

public List<string> GetReadersList()
    {
        string ReaderList = "" + Convert.ToChar(0);
        int indx;
        int pcchReaders = 0;
        string rName = "";
        List<string> lstReaders = new List<string>();
        //Establish Context
        retCode = Card.SCardEstablishContext(Card.SCARD_SCOPE_USER, 0, 0, ref hContext);


        // 2. List PC/SC card readers installed in the system

        retCode = Card.SCardListReaders(this.hContext, null, null, ref pcchReaders);

        if (retCode != Card.SCARD_S_SUCCESS)
        {
            throw new Exception("Error SCardListReaders");
        }

        byte[] ReadersList = new byte[pcchReaders];

        // Fill reader list
        retCode = Card.SCardListReaders(this.hContext, null, ReadersList, ref pcchReaders);

        if (retCode != Card.SCARD_S_SUCCESS)
        {
            throw new Exception("Error SCardListReaders");
        }

        rName = "";
        indx = 0;


        while (ReadersList[indx] != 0)
        {

            while (ReadersList[indx] != 0)
            {
                rName += (char)ReadersList[indx];
                indx++;
            }


            lstReaders.Add(rName);
            rName = "";
            indx++;

        }
        return lstReaders;
    }
  1. 内存诊断： 在此处输入图像描述。

所有内存上升都在读卡器上持卡时。

PS：我在 Window Form、Console 和 Window Service 平台上都试过这个。

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0 回答 0