GCHandle和不安全之间的内存消耗更好/更快

Question

我有这段代码：

GCHandle handle = GCHandle.Alloc(array, GCHandleType.Pinned);
try
{
    IntPtr pointer = handle.AddrOfPinnedObject();
}
finally
{
    if (handle.IsAllocated)
    {
        handle.Free();
    }
}

然后有这个：

unsafe
{
  fixed (int* pArray = array)
  {
    IntPtr intPtr = new IntPtr((void *) pArray);
  }
}

什么是更快，更少的内存消耗？请问咨询方法是什么？

附加：

我从C＃调用OpenCV DLL ...

  public  byte[] ToJpegData(int qua)
  {
      byte[] data = null;
      int[] p = new int[3];
      p[0] = 1;
      p[1] = qua;// desired_quality_value;
      p[2] = 0;

      GCHandle handle = GCHandle.Alloc(p, GCHandleType.Pinned);
      try
      {
          IntPtr quality = handle.AddrOfPinnedObject();


          //IntPtr quality = new IntPtr(p);
          IntPtr mat = CvInvoke.cvEncodeImage(".jpg", Ptr, quality);// IntPtr.Zero);


          MCvMat cvMat = (MCvMat)Marshal.PtrToStructure(mat, typeof(MCvMat));
          data = new byte[cvMat.rows * cvMat.cols];
          Marshal.Copy(cvMat.data, data, 0, data.Length);
          CvInvoke.cvReleaseMat(ref mat);


      }
      finally
      {
          if (handle.IsAllocated)
          {
              handle.Free();
          }
      }

      return data;
  }