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<H1>利用 DirectShow 開發(fā)自己的 Filter</H1>
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<H2>本文詳細介紹利用 DirectShow 開發(fā)自己的 Filter </H2></DIV>
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<P> <CODE>CMyFilter::CMyFilter(TCHAR *pName,LPUNKNOWN pUnk,HRESULT
*hr)<BR> :CBaseFilter(NAME("my filter"), pUnk, this, CLSID_MYFilter)<BR>{
}<BR>CMyFilter::~CMyFilter()<BR>{}<BR>// Public method that returns a new
instance.<BR>CUnknown * WINAPI CMyFilter::CreateInstance(LPUNKNOWN pUnk, HRESULT
*pHr)<BR>{ <BR> CMyFilter *pFilter = new CMyFilter(NAME("my Filter"), pUnk,
pHr);<BR> if (pFilter== NULL)<BR> {<BR> *pHr =
E_OUTOFMEMORY;<BR> }<BR> return pFilter;<BR>}<BR>CBasePin *
CMyFilter::GetPin(int n)<BR>{<BR> return NULL;<BR>}<BR>int
CMyFilter::GetPinCount()<BR>{<BR> return 0;<BR>}</CODE>
<P> 這樣基本上就實現(xiàn)了一個filter,但是這個filter沒有與之相聯(lián)系的PIN,但是實現(xiàn)Filter的基本過程就時這樣了,至于邏輯上的東西,比如Filter和pin如何連接,數(shù)據(jù)流是如何流動的,你都要去看看sdk了,按照上面的步驟你就可以寫一個Filter的框架出來。</P>
<P> 下面我們總結(jié)一下寫一個Filter至少需要那些東西。</P>
<P> 1、Filter的實現(xiàn)類</P>
<P> 在這里就是CMyFilter類,在這個類里你可以實現(xiàn)自己的邏輯上的功能,包括定義你的filter的特性,給你的filter配備pin接口等。</P>
<P> 2 com組件的引出函數(shù),五個全局函數(shù):</P><CODE>DllMain //dll的入口函數(shù)<BR>DllGetClassObject
//獲得com組件的類廠對象<BR>DllCanUnloadNow //com組件是否可以卸載<BR>DllRegisterServer
//注冊com組件<BR>DllUnregisterServer //卸載com組件<BR>其中DllGetClassObject
已經(jīng)由基類完成,你自己只要完成三個函數(shù)即可,<BR>DllMain,DllRegisterServer,DllUnregisterServer。</CODE>
<P> 3、com組件的類廠對象</P></DIV><!-- 分頁 -->
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