private void TestData()
{
int hr;
const int SIZE = 100;
int i;
IntPtr ip = Marshal.AllocCoTaskMem(SIZE);
IntPtr ip2 = Marshal.AllocCoTaskMem(SIZE);
Marshal.WriteInt64(ip, 123456789);
hr = m_pVideoGroupObj.SetUserData(ip, SIZE);
DESError.ThrowExceptionForHR(hr);
hr = m_pVideoGroupObj.GetUserData(ip2, out i);
DESError.ThrowExceptionForHR(hr);
long j = Marshal.ReadInt64(ip2);
Debug.Assert(i == SIZE && j == 123456789, "UserData");
Marshal.FreeCoTaskMem(ip);
Marshal.FreeCoTaskMem(ip2);
}
