use DirectX 9, instead of calling a method like Play(*mysoundbuffer) 
that will write the sound to a "soundcard buffer" ... you will call a 
method Write(*mysoundbuffer, filename) that will take the same sound and 
write it to a file .... this is essentially "capturing" the sound out.

see code examples from the DirectX 9 SDK.
http://msdn.microsoft.com/library/default.asp?url=/nhp/default.asp?contentid=28000410

best,
sdj

kiplring wrote:
> Is there anyway to capturing the speaker-out-sound( not from microphone)?
> 
>  Any Library, or Win-API welcomed. 
>  Thanks.

Is there anyway to capturing the speaker-out-sound( not from microphone)?

 Any Library, or Win-API welcomed. 
 Thanks.