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Corrected a bug in CommAPI: GetCommState MUST be called

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before BuildCommDCB() and SetCommState(). This is needed
 in WinNT SP5 and Windows2000.
This commit is contained in:
Claudio Lanconelli 2000-02-16 15:41:34 +00:00
parent 5305b1ae46
commit 40d5305cdd
1 changed files with 15 additions and 10 deletions
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25
rs232int.cpp
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@ -493,19 +493,24 @@ int RS232Interface::SetSerialParams(long speed, int bits, int parity, int stops,
char dcb_str[128];
DCB com_dcb;
sprintf(dcb_str, "baud=%ld parity=%c data=%d stop=%d", actual_speed, actual_parity, actual_bits, actual_stops);
if ( BuildCommDCB(dcb_str, &com_dcb) )
if ( GetCommState(hCom, &com_dcb) )
{
if (actual_flowcontrol == 0)
sprintf(dcb_str, "baud=%ld parity=%c data=%d stop=%d", actual_speed, actual_parity, actual_bits, actual_stops);
if ( BuildCommDCB(dcb_str, &com_dcb) )
{
com_dcb.fDtrControl = DTR_CONTROL_DISABLE;
com_dcb.fRtsControl = RTS_CONTROL_DISABLE;
if (actual_flowcontrol == 0)
{
com_dcb.fDtrControl = DTR_CONTROL_DISABLE;
com_dcb.fRtsControl = RTS_CONTROL_DISABLE;
}
if ( SetCommState(hCom, &com_dcb) )
result = OK;
else
result = GetLastError();
PurgeComm(hCom, PURGE_TXCLEAR|PURGE_RXCLEAR);
}
if ( SetCommState(hCom, &com_dcb) )
result = OK;
PurgeComm(hCom, PURGE_TXCLEAR|PURGE_RXCLEAR);
}
}
#else