public override bool Halt(out string msg)
{
bool res = true;
int st = 0;
st = ReaderDllMethod.mwHalt(handle); //将选定的卡片置于HALT模式，需要Request All将其唤醒
if (st < 0)
{
msg = st.ToString() + "*" + ReaderDllMethod.getErrMsg(st);
res = false;
}
else
{
msg = st.ToString() + "*" + ReaderDllMethod.getErrMsg(st);
}
return(res);
}