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DllImport ERROR_MORE_DATA UNMANAGED Call C   in C#

DWORD OREnumKey(

      __in         ORHKEY Handle,

      __in         DWORD dwIndex,

      __out        PWSTR lpName,

      __inout      PDWORD lpcName,

      __out_opt    PWSTR lpClass,

      __inout_opt  PDWORD lpcClass,

      __out_opt    PFILETIME lpftLastWriteTime

    );

       

[DllImport("offreg.dll", CharSet = CharSet.Unicode, SetLastError = true)]

public static extern uint OREnumKey(IntPtr Handle, IntPtr dwIndex, [MarshalAs(UnmanagedType.LPWStr)]out StringBuilder lpName, ref IntPtr lpcName, [MarshalAs(UnmanagedType.LPWStr)]out StringBuilder lpClass, ref IntPtr lpcClass, out System.Runtime.InteropServices.ComTypes.FILETIME lpftLastWriteTime);

 IntPtr myKey = hiveid;

    IntPtr dwindex=(IntPtr)0;

    StringBuilder lpName=new StringBuilder("",255);

    IntPtr lpcName = (IntPtr)0;

    StringBuilder  lpClass=new StringBuilder("",255);

    IntPtr lpcClass = (IntPtr)11;

    System.Runtime.InteropServices.ComTypes.FILETIME lpftLastWriteTime;

    uint ret3 = OREnumKey(myKey, dwindex, out lpName, ref lpcName, out lpClass, ref lpcClass, out lpftLastWriteTime);

       

[DllImport("offreg.dll", CharSet = CharSet.Unicode, SetLastError = true)]

public static extern uint OREnumKey(

    IntPtr Handle,

    int dwIndex,

    StringBuilder lpName,

    ref int lpcName,

    StringBuilder lpClass,

    ref int lpcClass,

    out System.Runtime.InteropServices.ComTypes.FILETIME lpftLastWriteTime);

 

    ...  

    StringBuilder lpName=new StringBuilder("",255);

    int nameSize = lpName.Capacity;

    StringBuilder  lpClass=new StringBuilder("",255);

    int classSize = lpClass.Capacity;

    System.Runtime.InteropServices.ComTypes.FILETIME lpftLastWriteTime;

    uint ret3 = OREnumKey(hiveid, 0, lpName, ref nameSize, lpClass, ref classSize, out lpftLastWriteTime);

    if (ret3 != 0) throw new Exception("kaboom");

    string name = lpName.ToString();

    string className = lpClass.ToString();