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Pcommserver in timeSetEvent


Flora
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I wrote my program using PcommServer based on MFC in Visual Studio 2010. It worked very well until I put the pmacDevice.GetResponseEx into the callback function of timeSetEvent, which is a multi-media timer in winmm.lib.

 

Once it runs to GetResponseEx, exceptions as following will be shown:

"First-chance exception at 0x00000000 in ***.exe: 0xC0000005: Access violation reading location 0x00000000."

"Unhandled exception at 0x00000000 in ***.exe: 0xC0000005: Access violation reading location 0x00000000."

 

And I add CoInitialize(NULL) in the callback function, it still doesn't work.

My question is how to use pmacDevice.GetResponseEx in the timeSetEvent callback function?

 

 

I attach the code as:

 

timeSetEvent:

void CTestDlg::OnBnClickedBtntimer()

{

TIMECAPS timecaps;

UINT wAccuracy_Test,TimerID_Test;

if(timeGetDevCaps(&timecaps,sizeof(TIMECAPS))==TIMERR_NOERROR)

{

wAccuracy_Test= min(max(timecaps.wPeriodMin,1),timecaps.wPeriodMax);

timeBeginPeriod(wAccuracy_Test);

while (( TimerID_Test = timeSetEvent(1000, wAccuracy_Test,(LPTIMECALLBACK) TestProc, (DWORD)this,TIME_PERIODIC)) == NULL) ;//

}

}

 

callback function:

 

UINT CTestDlg::TestProc(UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2 )

{

CoInitializeEx(NULL);

char cmdbuf[255];

BSTR retbuf = ::SysAllocString(L"");

BOOL pStatus;

((CTestDlg*)theApp.m_pMainWnd)->pmacDevice.GetResponse(0, "I122=3",FALSE, &retbuf,&pStatus);

::SysFreeString(retbuf);

CoUninitialize();

return 0;

}

 

Open device:

void CTestDlg::OnBnClickedBtnopen()

{

CoInitialize(NULL);

testInterface = pmacDevice.CreateDispatch(_T("PcommServer.PmacDevice.1"));

if (!testInterface)

{

AfxMessageBox("Fail to open library!");

return;

}

BOOL ret;

pmacDevice.SelectDevice(NULL,&m_nDevice,&ret);

int pbDriverOpen;

pmacDevice.Open(m_nDevice, &pbDriverOpen);

 

if(!pbDriverOpen)

{

AfxMessageBox("Fail to open Device!");

}

else

{

pmacDevice.GetDPRAvailable(m_nDevice);

}

}

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