使用C#调用PC\SC接口返回读卡器数量不对
using System;

using System.Text;

using System.Runtime.InteropServices;

class PCSC
{

public struct SCARD_IO_REQUEST
{

public int dwProtocol;

public int cbPciLength;

}

[DllImport("WinScard.dll")]

public static extern int SCardEstablishContext(uint dwScope, int nNotUsed1, int nNotUsed2, ref uint phContext);

[DllImport("WinScard.dll")]

public static extern int SCardReleaseContext(int phContext);

[DllImport("WinScard.dll")]

public static extern int SCardConnect(int hContext, string cReaderName,

uint dwShareMode, uint dwPrefProtocol, ref int phCard, ref int ActiveProtocol);

[DllImport("WinScard.dll")]

public static extern int SCardDisconnect(int hCard, int Disposition);

[DllImport("WinScard.dll")]

public static extern int SCardListReaderGroups(int hContext, ref string cGroups, ref int nStringSize);

[DllImport("WinScard.dll")]

public static extern int SCardListReaders(uint hContext, string cGroups, ref string cReaderLists, ref int nReaderCount);

[DllImport("WinScard.dll")]

public static extern int SCardFreeMemory(uint hContext, string cResourceToFree);

[DllImport("WinScard.dll")]

public static extern int SCardGetAttrib(int hContext, uint dwAttrId,

ref byte[] bytRecvAttr, ref int nRecLen);

[DllImport("WinScard.dll")]

public static extern int SCardTransmit(int hCard, ref SCARD_IO_REQUEST pioSendPci, byte[] pbSendBuffer, int cbSendLength, ref SCARD_IO_REQUEST pioRecvPci, ref byte[] pbRecvBuffer, ref int pcbRecvLength);

[DllImport("WinScard.dll")]

public static extern int SCardTransmit(int hCard, ref SCARD_IO_REQUEST pioSendPci, byte[] pbSendBuffer, int cbSendLength, ref SCARD_IO_REQUEST pioRecvPci, ref byte pbRecvBuffer, ref int pcbRecvLength);


static void Main(string[] args)
{
int cch = -1;
long lReturn;
uint m_hContext;
m_hContext = 0;
string pmszReaders = string.Empty;
string aReaders = "";
string pReader;
int iCount = 0;

lReturn = SCardEstablishContext(0, 0, 0, ref m_hContext);
if (lReturn < 0)
{
//AfxMessageBox("建立连接读卡器失败");0xcd010000

return;
}

lReturn = SCardListReaders(m_hContext, null, ref pmszReaders, ref cch);

System.Console.WriteLine(pmszReaders);
}

}

//上面是我写的C#代码，我电脑上面有两个PC\SC的读卡器，但pmszReaders就只返回一个读卡器
//但我使用C++去调用是可以返回两个读卡器的，
//求大神知道

[解决办法]
应该是传递参数问题，string 见到/0就认为是完了，不过没找到什么解决办法，用char[]也不行，你有什么别的传递类型试试吧，最后一个参数是list 的长度