Error "pure virtual function call"

Question

Hi,
Windows7, PCI-GPIB, NI-488.2 Version 3.1.1, Visual Studio 2010 C++ Application.
Randomly between 10 minuntes and 4 hours I get the error "pure virtual function call"
With the debbuger attached to the process in error I identified NI4882.dll as the source of the error.
Then I deinstalled NI-488.2 Version 3.1.1 and installed NI488.2 July 2000. Then my application runs without any error!
I tried to attach the source files which represents the interface between my application and the NI-4882 driver but it did not work for the C++ file.
Any help appreciated.
Best Regards
Walter
Attachments:
_GPIB.h ‏4 KB

Answer 1

Part 2:
Int TGpib::Open (UShort adr, ULong timeoutMs)
if (mDevices.empty ())
Reset ();
Int ud = ibdev (mBoardID, adr, 0, TimeoutCode (timeoutMs), 1, 0);
if (ud < 0)
MCTraceLib (this, eTraceError, TFCTX, _T("open device '%d' failed"), adr);
GPIBError (-1, FCTX, true);
return -1;
SDevInfo devInf;
devInf.mGpibAdr = adr;
mDevices[ud] = devInf;
if (!DeviceClear (ud))
MCTraceLib (this, eTraceError, TFCTX, _T("no device on address '%d'"), adr);
GPIBError (ud, FCTX, true);
Close (ud);
return -1;
if (Send (ud, "*IDN?"))
Tstring s = String2Tstring (Enter (ud));
StringList l = Split (s, _T(','));
if (l.size () == 4)
mDevices[ud].mVendorName = l[0];
mDevices[ud].mModelName = l[1];
else
MCTraceLib (this, eTraceError, TFCTX, _T("no device on address '%d'"), adr);
GPIBError (ud, FCTX, true);
Close (ud);
return -1;
Local (ud);
return ud;
bool TGpib::Close (Int ud)
GPIBDevMap::iterator it = mDevices.find (ud);
if (it != mDevices.end ())
Local (ud);
Int stat = ibonl (ud, 0);
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("close device ud = '%d' failed"), ud);
GPIBError (ud, FCTX, true);
return false;
mDevices.erase (it);
return true;
return false;
bool TGpib::SetTimeout (Int ud, ULong timeoutMs)
Int stat = ibtmo (ud, TimeoutCode (timeoutMs));
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("set timeout device ud = '%d' failed"), ud);
GPIBError (ud, FCTX, true);
return false;
return true;
ULong TGpib::Timeout ()
return mTimeout;
bool TGpib::EnableSRQ (Int ud, HANDLE srqEvent)
if (srqEvent != INVALID_HANDLE_VALUE)
GPIBDevMap::iterator it = mDevices.find (ud);
if (it != mDevices.end ())
(it->second).mSRQEvent = srqEvent;
Int stat = ibnotify (mBoardID, SRQI, GpibSRQ, (void*)this);
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("on device ud = '%d' failed"), ud);
GPIBError (ud, FCTX, true);
return false;
MCTraceLib (this, eTraceDebug, TFCTX, _T("(SRQ)on device ud = '%d' success"), ud);
return true;
else
MCTraceLib (this, eTraceError, TFCTX, _T("srqEvent == INVALID_HANDLE_VALUE"));
return false;
bool TGpib::DisableSRQ (Int /*ud*/)
return true;
bool TGpib::Remote (Int ud)
Int adr;
ibask (ud, IbaPAD, &adr);
adr += 32; // Talk Address = Listen Address + 32
char cmdbuf[] = {MTA0, 0, LLO, UNT, UNL};
cmdbuf[1] = char(adr);
Int stat = ibcmd (mBoardID, &cmdbuf, 5);
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("on device ud = '%d' failed"), ud);
GPIBError (ud, FCTX, true);
return false;
mDevices[ud].mRemote = true;
return true;
bool TGpib::Local (Int ud)
mDevices[ud].mRemote = false;
Int stat = ibloc (ud);
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("on device ud = '%d' failed"), ud);
GPIBError (ud, FCTX, true);
return false;
return true;
char TGpib::SerialPoll (Int ud)
char pollChr;
Int stat = ibrsp (ud, &pollChr);
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("on device ud = '%d' failed"), ud);
GPIBError (ud, FCTX);
return false;
return static_cast<char> (pollChr & 0x9F); // VM QueryError eliminieren
bool TGpib::DeviceClear (Int ud)
Int stat = ibclr (ud);
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("on device ud = '%d' failed"), ud);
GPIBError (ud, FCTX, true);
return false;
return true;
bool TGpib::Trigger (Int ud)
Int stat = ibtrg (ud);
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("on device ud = '%d' failed"), ud);
GPIBError (ud, FCTX);
return false;
return true;
bool TGpib::Send (Int ud, const std::string& str)
Int stat = ibeot (ud, 1);
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("'EOI on' on ud = '%d' failed"), ud);
GPIBError (ud, FCTX);
return false;
stat = ibwrt (ud, (void*)str.c_str (), str.length ());
Long sent = ThreadIbcntl ();
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("on device ud = '%d' failed"), ud);
GPIBError (ud, FCTX);
return false;
if (sent != static_cast<Long> (str.length ()))
MCTraceLib (this, eTraceError, TFCTX, _T("only %d of %d characters sent"), sent, str.length ());
return false;
return true;
bool TGpib::SendNoEOI (Int ud, const std::string& str)
Int stat = ibeot (ud, 0);
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("'EOI off' on ud = '%d' failed"), ud);
GPIBError (ud, FCTX);
return false;
stat = ibwrt (ud, (void*)str.c_str (), str.length ());
Long sent = ThreadIbcntl ();
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("on device ud = '%d' failed"), ud);
GPIBError (ud, FCTX);
return false;
if (sent != static_cast<Long> (str.length ()))
MCTraceLib (this, eTraceError, TFCTX, _T("only %d of %d characters sent"), sent, str.length ());
return false;
return true;
std::string TGpib::Enter (Int ud)
std::string str = "";
char* buf = new char[2048];
Int stat = ibrd (ud, (void*)buf, 2047);
Long got = ThreadIbcntl ();
if ((stat & ERR) != 0)
MCTraceLib (this, eTraceError, TFCTX, _T("on device ud = '%d' failed"), ud);
GPIBError (ud, FCTX);
else
buf[got] = '\0';
str = buf;
// eventuelle LF und CR vom Ende entfernen!
string::size_type idx = str.find_last_of (k_CR);
str = str.substr (0, idx);
idx = str.find_last_of (k_LF);
str = str.substr (0, idx);
delete[] buf;
return str;