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再谈声卡识别但不出声的问题

上次在一个关于声卡识别的问题提到了一个关于声卡在设备管理器中能够识别， 但是声音选项中缺说找不到音频设备的问题。

我转的解法是用Plug and Play Software Device Enumerator替换一个已有设备ISAPNP Read Data Port。起初我认为是识别有误，

但后来感到有些不对劲， 觉得那本身是一个正常的系统设备。 虽然能正常工作， 但毕竟不是完美解决方案。 后来再次尝试了上次

也提到的重装Plug and Play Software Device Enumerator的方法：

1.假设windows装在c:\windows下， 将c:\windows\inf\machine.inf, c:\windows\system32\streamci.dll, c:\windows\system32

\drivers\swenum.sys拷到一个临时目录下

2.修改machine.inf，找到[ControlFlags], 把下面一行ExcludeFromSelect=*删去

3.如果现在设备管理器中有Plug and Play Software Device Enumerator， 那么用现在的临时目录给它更新驱动即可，否则依次进

入控制面板->添加硬件， 几次"下一步"后依次选"添加新的硬件设备"，"安装我手动从列表选择的硬件"，"显示所有设备"，"从磁盘

安装", 此时选那个目录， 然后厂商选"(标准系统设备)"， 型号选"Plug and Play Software Device Enumerator", 然后安装便可

。

最后还查到一个解法， 是说在注册表中删除所有swenum的相关项， 然后就能自动识别Plug and Play Software Device Enumerator

了， 不过这个没试过， 不知是否真的可行。
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