I have some c++ code I am having trouble with that uses Device simulation framework from Microsoft's WDK 7.1. I am trying to create multiple mouse devices but I am having problems with the report being sent at all if the fFeatures of the array is not 0x892. I have tried to send an input report but I think I have declared my safe array wrong because it fails to work:
STDMETHODIMP CMMEmulator::sendinputreport(BYTE inputreport[5])
{
//SAFEARRAY *inputreport
// Create as an Array of Variants because that is what the DSF
// Interface->put_DeviceSpecificDescriptor is expecting an array of Variants
FADF_STATIC+FADF_FIXEDSIZE+FADF_VARIANT+FADF_HAVEVARTYPE;
if( test->fFeatures == 0x892)
{
MessageBox(NULL,L"has correct safearray type",L"correct data format",NULL);
}
// test->fFeatures = 2194;
Here I assign a byte to each part of the safe array:
// Step through the SAFEARRAY and populate each variant with a Byte value
LONG length = 4;
//SafeArrayLock(psaValues);
CComVariant v;
for(int i = 0; i < 5; i++)
{
//j[i] = i;
MessageBox(NULL,L"inputreport assigned to variable",NULL,NULL);
v.Clear();
v.vt = VT_UI1;
v.uiVal = inputreport[i];
v.Detach(&pDescriptorData[i]);
c.Add (v, TRUE);
}
This section of code is for sending an input report to a device I select using devindex (integer).
MessageBox(NULL,L"data is successfully assigned to safearray",L"correct data format",NULL);
//piSoftHidDevice1[devindex]->
piSoftHidDevice1[devindex]->QueueInputReport(c,8);
piSoftHidDevice1[devindex]->StartProcessing();
piSoftHidDevice1[devindex]->StopProcessing();
return S_OK;
//Exit:
//SafeArrayUnaccessData(test);
//return 0;
}
Here is the c++ code for queue input report I am passing data to:
STDMETHODIMP CHIDDevice::QueueInputReport( SAFEARRAY* psaInputReport, UINT timeoutDuration )
/*++
Routine Description:
Queues additional input reports
Arguments:
IdleTimeout - used to set the value of the log level
Return value:
S_OK
--*/
{
VARIANT * pArrayData = NULL;
UINT cbData = 5;
LONG lLBound = 0;
LONG lUBound = 0;
HRESULT hr = S_OK;
HID_INPUT_REPORT inputReport;
BOOLEAN result = TRUE;
// Initialize Structure
inputReport.timeout = timeoutDuration;
inputReport.cbInputReport = 0;
inputReport.pbInputReport = NULL;
MessageBox(NULL,L"report initialized",L"initial report",NULL);
// Get SAFEARRAY size
IfFailHrGo(SafeArrayGetLBound(psaInputReport, 1, &lLBound));
IfFailHrGo(SafeArrayGetUBound(psaInputReport, 1, &lUBound));
IfFalseHrGo(lUBound > lLBound, E_UNEXPECTED);
cbData = lUBound - lLBound + 1;
//psaInputReport->fFeatures = 0x892;
//psaInputReport->fFeatures = 0x892;
inputReport.pbInputReport = (BYTE*)CoTaskMemAlloc( cbData * sizeof(BYTE) );
_TCHAR szBuffer3[100];
_stprintf_s(szBuffer3, _T("%i"), &psaInputReport->fFeatures);
MessageBox(NULL,L"array content features",szBuffer3,NULL);
// If the memory Allocation fails, then fail and exit
if( inputReport.pbInputReport == NULL )
{
hr = E_UNEXPECTED;
goto Exit;
}
//void HUGEP** cast orginally
IfFailHrGo( SafeArrayAccessData( psaInputReport,
reinterpret_cast<void HUGEP**>(&pArrayData) ) );
// Step through the SAFEARRAY and populating only BYTE input report
// and bail out if the type is not correct
for( LONG i = 0; i <= lUBound; ++i )
{
if (pArrayData[i].vt == VT_UI1)
{
inputReport.pbInputReport[i] = pArrayData[i].bVal;
}
else
{
hr = E_FAIL;
goto Exit;
}
}
SafeArrayUnaccessData(psaInputReport);
inputReport.cbInputReport = cbData;
//MessageBox(NULL,L"report being sent next",L"sent report",NULL);
// Add the report to the input queue (does a shallow copy so no need to free the array data)
result = m_InputReportQueue.insert( inputReport );
if (result == FALSE)
{
MessageBox(NULL,L"failed to queue the input",NULL,NULL);
hr = E_FAIL;
}
return hr;
Exit:
SafeArrayUnaccessData(psaInputReport);
if( FAILED(hr) )
{
CoTaskMemFree(inputReport.pbInputReport);
}
return hr;
}
c++
If anyone has any hints as to what I am doing wrong can you please share them?
