将IntPtr转化成byte[]
Dll函数原型：
BOOL UsbScan_ExchangData(PUCHAR pDataBuf, DWORD& dwDataLen , DWORD dwCtl)；

调用方式：
[DllImport("MDcs.dll")]
private static extern bool UsbScan_ExchangData(byte[] pDataBuf, ref UInt32 dwDataLen, UInt32 dwCtl);

//检查设备存在功能
public bool IsValid(UIntPtr hDevDropEvent)
{
  bool bRet = false;
  UInt32 byLen = 0;
  //bRet = UsbScan_ExchangData(？？？？？？？？？？？？？？？, ref byLen, API_USBSCAN_DEVEXIT）；
  return bRet;
}


请问注释部分如何进行传递？


vc调用的函数如下：
BOOL CUScanDriver::IsValid(HANDLE hDevDropEvent)
{
BOOL bRet = FALSE;
ULONG dwLen;
bRet = m_Func( (PUCHAR)&hDevDropEvent,dwLen,API_USBSCAN_DEVEXIT);
return bRet;
}



------解决方案--------------------
至于题目上的问题：将IntPtr转化成byte[]

用Marshall类，满足你的要求哟~~
------解决方案--------------------

C# code

        public static bool IsValid(IntPtr hDevDropEvent)
        {
            bool bRet = false;
            UInt32 byLen = 0;
            Byte[] bufHandle = new Byte[IntPtr.Size];
            GCHandle gch = GCHandle.Alloc(bufHandle, GCHandleType.Pinned);    //固定托管内存
            Marshal.WriteIntPtr(Marshal.UnsafeAddrOfPinnedArrayElement(bufHandle, 0), hDevDropEvent);
            bRet = UsbScan_ExchangData(bufHandle, ref byLen, API_USBSCAN_DEVEXIT);
            gch.Free();
            return bRet;
        }