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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(xì)介紹利用 DirectShow 開發(fā)自己的 Filter </H2></DIV>
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<DIV class=article_c
id=fontsize><CODE>DllMain<BR>DllGetClassObject<BR>DllCanUnloadNow<BR>DllRegisterServer<BR>DllUnregisterServer</CODE>
<P> 首先定義導(dǎo)出函數(shù):</P>
<P> 要導(dǎo)出這些函數(shù)有兩種方法,一是在定義函數(shù)時(shí)使用導(dǎo)出關(guān)鍵字_declspec(dllexport),另外一種方法是在創(chuàng)建DLL文件時(shí)使用模塊定義文件.Def。使用導(dǎo)出函數(shù)關(guān)鍵字_declspec(dllexport)創(chuàng)建MyDll.dll就是在
.h文件中定義定義函數(shù)如下:</P><CODE>extern "C" _declspec(dllexport)BOOL DllRegisterServer;
等等 </CODE>
<P> 為了用.def文件創(chuàng)建DLL,往該工程中加入一個(gè)文本文件,命名為MyDll.def,再在該文件中加入如下代碼:</P><CODE>LIBRARY
MyFilter.ax<BR>EXPORTS<BR>DllMain PRIVATE<BR>DllGetClassObject
PRIVATE<BR>DllCanUnloadNow PRIVATE<BR>DllRegisterServer
PRIVATE<BR>DllUnregisterServer PRIVATE</CODE>
<P> 其中LIBRARY語句說明該def文件是屬于相應(yīng)DLL的,EXPORTS語句下列出要導(dǎo)出的函數(shù)名稱。我們可以在.def文件中的導(dǎo)出函數(shù)后加@n,如Max@1,Min@2,表示要導(dǎo)出的函數(shù)順序號(hào),在進(jìn)行顯式連時(shí)可以用到它。該DLL編譯成功后,打開工程中的Debug目錄,同樣也會(huì)看到MyDll.dll和MyDll.lib文件。</P>
<P> 然后要定義這些函數(shù)的實(shí)現(xiàn)了,其實(shí)這些工作dshow的基類里都已經(jīng)替我們做好了,我們所要做的就拿來用就是了,最重要的三個(gè)函數(shù)的實(shí)現(xiàn)一般如下 </P><CODE>STDAPI
DllRegisterServer()<BR>{<BR> return
AMovieDllRegisterServer2(TRUE);<BR>}<BR>STDAPI
DllUnregisterServer()<BR>{<BR> return
AMovieDllRegisterServer2(FALSE);<BR>}<BR>extern "C" BOOL WINAPI
DllEntryPoint(HINSTANCE, ULONG, LPVOID);<BR>BOOL APIENTRY DllMain(HANDLE
hModule, DWORD dwReason, LPVOID lpReserved)<BR>{<BR> return
DllEntryPoint((HINSTANCE)(hModule), dwReason, lpReserved);<BR>}</CODE>
<P> 其中DllEntryPoint
是在C:\DX90SDK\Samples\C++\DirectShow\BaseClasses\dllentry.cpp定義的,如果感興趣我們可以去看看它的定義。
AMovieDllRegisterServer2函數(shù)是在下面
C:\DX90SDK\Samples\C++\DirectShow\BaseClasses\dllsetup.cpp這個(gè)文件定義的,具體實(shí)現(xiàn)可以自己看看。</P></DIV><!-- 分頁 -->
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