问如何强制winCE在启动后看到SD/MMC卡

EN

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
 public struct DEVMGR_DEVICE_INFORMATION
 {
  public uint dwSize;
  public IntPtr hDevice;
  public IntPtr hParentDevice;
  [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 6)]
  public string szLegacyName;
  [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
  public string szDeviceKey;
  [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
  public string szDeviceName;
  [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
  public string szBusName;
}

public enum DeviceSearchType : int
{
  DeviceSearchByLegacyName = 0,
  DeviceSearchByDeviceName = 1,
  DeviceSearchByBusName = 2,
  DeviceSearchByGuid = 3,
  DeviceSearchByParent = 4
}
class DevDriverInterface
{
  [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
  public struct SECURITY_ATTRIBUTES
  {
     public int nLength;
     public IntPtr lpSecurityDescriptor;
     public bool bInheritHandle;
  }

  [DllImport("coredll.dll", SetLastError = true)]
  public extern static int ActivateDeviceEx(string device, IntPtr regEnts,
     UInt32 cRegEnts, IntPtr devKey);

  [DllImport("coredll.dll", SetLastError = true)]
  public extern static bool DeactivateDevice(int handle);

  [DllImport("coredll.dll", SetLastError = true)]
  public static extern int FindFirstDevice(DeviceSearchType
  searchType, IntPtr searchParam, ref DEVMGR_DEVICE_INFORMATION pdi);

  // Constructor
  public DevDriverInterface() { }

  public bool MountSDCardDrive()
  {
     const int INVALID_HANDLE_VALUE = -1;

     string mRegPath1 = "";
     int handle = INVALID_HANDLE_VALUE;
     DeviceSearchType searchType = DeviceSearchType.DeviceSearchByDeviceName;

     DEVMGR_DEVICE_INFORMATION di = new DEVMGR_DEVICE_INFORMATION();
     di.dwSize = (uint)Marshal.SizeOf(typeof(DEVMGR_DEVICE_INFORMATION));

     String searchParamString = "SDH1";

     IntPtr searchParam = Marshal.StringToBSTR(searchParamString);

     handle = FindFirstDevice(searchType, searchParam, ref di);

     if (handle == INVALID_HANDLE_VALUE)
     {
        // Failure - print error
        int hFindFirstDeviceError = Marshal.GetLastWin32Error();
        using (StreamWriter bw = new StreamWriter(File.Open(App.chipDebugFile, 
            FileMode.Append)))
        {
           String iua = "DevDriverInterface: error from FindFirstDevice: " + 
                  hFindFirstDeviceError.ToString();
           bw.WriteLine(iua);
        }
        return false;
     }
     else
     {
        mRegPath1 = di.szDeviceKey;
        bool deactBool = DeactivateDevice((int) di.hDevice);
        if (deactBool == false)
        {
           using (StreamWriter bw = new StreamWriter(File.Open(App.chipDebugFile,
              FileMode.Append)))
           {
              String iua = "DevDriverInterface: DeactivateDevice: returned false -
                          FAILED";
              bw.WriteLine(iua);
           }
           return false;
        }

        Thread.Sleep(50);
        // Call ActiveDevice to setup the device driver
        handle = ActivateDeviceEx(mRegPath1, IntPtr.Zero, 0, IntPtr.Zero);
        if (handle == INVALID_HANDLE_VALUE)
        {
           // Failure - print error
           int hActivateDeviceError = Marshal.GetLastWin32Error();

           using (StreamWriter bw = new StreamWriter(File.Open(App.chipDebugFile, 
              FileMode.Append)))
           {
              String iua = "DevDriverInterface: error from ActivateDevice: " + 
                     hActivateDeviceError.ToString();
              bw.WriteLine(iua);
           }
           return false;
        }

     }

     return true;
  }

}; // end class