' Obtain a line corresponding to the component type
 rc = mixerGetLineInfo(hmixer, mxl, MIXER_GETLINEINFOF_COMPONENTTYPE)
执行正确 ' Get the control
 rc = mixerGetLineControls(hmixer, mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE)
执行失败源文件从http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/Q187/6/73.asp&NoWebContent=1 下载的,请多多帮忙!