本文整理汇总了C++中CBasePin::AddRef方法的典型用法代码示例。如果您正苦于以下问题：C++ CBasePin::AddRef方法的具体用法？C++ CBasePin::AddRef怎么用？C++ CBasePin::AddRef使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类CBasePin的用法示例。
在下文中一共展示了CBasePin::AddRef方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: if
STDMETHODIMP
CEnumPins::Next(ULONG cPins, // place this many pins...
IPin **ppPins, // ...in this array
ULONG *pcFetched) // actual count passed returned here
{
CheckPointer(ppPins,E_POINTER);
ValidateReadWritePtr(ppPins,cPins * sizeof(IPin *));
ASSERT(ppPins);
if (pcFetched!=NULL) {
ValidateWritePtr(pcFetched, sizeof(ULONG));
*pcFetched = 0; // default unless we succeed
}
// now check that the parameter is valid
else if (cPins>1) { // pcFetched == NULL
return E_INVALIDARG;
}
ULONG cFetched = 0; // increment as we get each one.
/* Check we are still in sync with the filter */
if (AreWeOutOfSync() == TRUE) {
// If we are out of sync, we should refresh the enumerator.
// This will reset the position and update the other members, but
// will not clear cache of pins we have already returned.
Refresh();
}
/* Calculate the number of available pins */
int cRealPins = min(m_PinCount - m_Position, (int) cPins);
if (cRealPins == 0) {
return S_FALSE;
}
/* Return each pin interface NOTE GetPin returns CBasePin * not addrefed
so we must QI for the IPin (which increments its reference count)
If while we are retrieving a pin from the filter an error occurs we
assume that our internal state is stale with respect to the filter
(for example someone has deleted a pin) so we
return VFW_E_ENUM_OUT_OF_SYNC */
while (cRealPins && (m_PinCount - m_Position)) {
/* Get the next pin object from the filter */
CBasePin *pPin = m_pFilter->GetPin(m_Position++);
if (pPin == NULL) {
// If this happend, and it's not the first time through, then we've got a problem,
// since we should really go back and release the iPins, which we have previously
// AddRef'ed.
ASSERT( cFetched==0 );
return VFW_E_ENUM_OUT_OF_SYNC;
}
/* We only want to return this pin, if it is not in our cache */
if (0 == m_PinCache.Find(pPin))
{
/* From the object get an IPin interface */
*ppPins = pPin;
pPin->AddRef();
cFetched++;
ppPins++;
m_PinCache.AddTail(pPin);
cRealPins--;
}
}
if (pcFetched!=NULL) {
*pcFetched = cFetched;
}
return (cPins==cFetched ? NOERROR : S_FALSE);
}