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<TD align=right><A href="http://www.csdn.net/">CSDN</A> - <A
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<TD align=middle bgColor=#003399 height=10><FONT
color=#ffffff>标题</FONT></TD>
<TD><B> 视频捕获 之
如何使用系统设备枚举器</B> sunjin007（翻译） </TD></TR>
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<TD align=middle bgColor=#003399><FONT color=#ffffff>关键字</FONT></TD>
<TD width=500> DirectShow DirectX
系统设备枚举器</TD></TR>
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<TD align=middle bgColor=#003399 height=10><FONT
color=#ffffff>出处</FONT></TD>
<TD height=10> <A
href="http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/directx9_c/directx/htm/usingthesystemdeviceenumerator.asp">http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/directx9_c/directx/htm/usingthesystemdeviceenumerator.asp</A></TD></TR>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B
style="mso-bidi-font-weight: normal"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如何使用系统设备枚举器</SPAN><SPAN
lang=EN-US><?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office"
/><o:p></o:p></SPAN></B></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN></B></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">系统设备枚举器为我们按类型枚举已注册在系统中的</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Fitler</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">提供了统一的方法。而且它能够区分不同的硬件设备，即便是同一个</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Filter</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">支持它们。这对那些使用</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Windows</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">驱动模型和</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">KSProxy
Filter</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的设备来说是非常有用的。系统设备枚举器对它们按不同的设备实例进行对待（译注：虽然它们支持相同</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Filter</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当我们利用系统设备枚举器查询设备的时候，系统设备枚举器为特定类型的设备（如，音频捕获和视频压缩）生成了一张枚举表（</SPAN><SPAN
lang=EN-US><FONT
face="Times New Roman">Enumerator</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）。类型枚举器（</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Category
enumerator</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）为每个这种类型的设备返回一个</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Moniker</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，类型枚举器自动把每一种即插即用的设备包含在内。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">按如下的步骤使用系统设备枚举器：</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21.75pt; TEXT-INDENT: -21.75pt; mso-list: l0 level1 lfo1; tab-stops: list 21.75pt"><SPAN
lang=EN-US style="mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore"><FONT face="Times New Roman">1．<SPAN
style="FONT: 7pt 'Times New Roman'"><FONT size=3>
</FONT></SPAN></FONT></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">调用方法</SPAN><SPAN
lang=EN-US><FONT
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