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while (true)
{
ZeroMemory(gradlg->m_readbuf,256);
PurgeComm(HComm_BMS,PURGE_RXCLEAR);
ClearCommError(HComm_BMS , &dwErrorFlags , &ComStat);
is2 = ReadFile(HComm_BMS, gradlg->m_readbuf, 256, &actualread, 0);