An implementation class using Windows API to control playback volume and recording microphone volume (C + + code)

1, header file (Mixer.h)

Mixer.h:interface for the Cmixer class. #if!defined (afx_mixer_h__7369baa5_012e _467E_AD1E_A383E4474C58__INCLUDED_) #define AFX_MIXER_H__7369BAA5_012E_467E_AD1E_A383E4474C58__INCLUDED_ #define Win32_lean_and_mean//Exclude rarely-used stuff from Windows headers #include "windows.h" #include <mmsystem.h> #if _msc_ver > 1000 #pragma once #endif//_msc_ver > 1000 class Cmixer {public:cmixer (); Cmixer (const int volrange); Virtual ~cmixer (); Enum mixerdeice{speakers=0, Waveout, synthesizer, microphone}; BOOL Getmute (Mixerdeice Dev); Check if the device is mute bool Setmute (Mixerdeice Dev,bool vol.); Set Device mute bool SetVolume (Mixerdeice Dev,long vol.); Set the volume of the device unsigned getvolume (Mixerdeice dev); Gets the volume of the device dev=0 the main volume, 1WAVE, 2MIDI, 3 line in Private:bool Getvolumecontrol (Hmixer hmixer, long Componenttype,long Ctrltype, mixercontrol* MXC); BOOL Setvolumevalue (hmixer hmixer, Mixercontrol *mxc, long volume); BOOL SetmutevaluE (hmixer hmixer, Mixercontrol *MXC, bool mute); Unsigned getvolumevalue (hmixer hmixer, Mixercontrol *MXC); Long Getmutevalue (hmixer hmixer, Mixercontrol *MXC); Long M_volrange; }; #endif//!defined (AFX_MIXER_H__7369BAA5_012E_467E_AD1E_A383E4474C58__INCLUDED_) 2, CPP file (Mixer.cpp)

Mixer.cpp:implementation of the Cmixer class. #include "stdwx.h" #include "Mixer.h"/////////////////////////////////////////////////////////////////////// Construction/destruction//////////////////////////////////////////////////////////////////////CMixer::CMixer () {m_volrange = 100;} Cmixer::~cmixer () {} cmixer::cmixer (const int volrange) {m_volrange = Volrange;}//----------------------------set the volume--- ------------------------------------bool Cmixer::getvolumecontrol (hmixer hmixer, long Componenttype,long Ctrltype, mixercontrol* mxc) {mixerlinecontrols mxlc; Mixerline MXL; BOOL exist = FALSE; mxl.cbstruct = sizeof (MXL); Mxl.dwcomponenttype = ComponentType; if (ComponentType = = Mixerline_componenttype_src_microphone) {//Get recording microphone device Mxl.dwcomponenttype = Mixerline_ Componenttype_dst_wavein; Gets the number of connections in the recording bus Mixergetlineinfo ((hmixerobj) hmixer, &AMP;MXL, Mixer_objectf_hmixer | Mixer_getlineinfof_componenttype); Save the number of connections DWORD dwconnections = mxl.cconnections; Ready to get the microphone device ID DWORD Dwlineid = 0; Esult Mr = Mixergetlineinfo (hmixerobj) hmixer, &AMP;MXL, Mixer_objectf_hmixer | Mixer_getlineinfof_source); Judgment function Execution Error if (Mr!= 0) {break;}//If the current device type is a microphone, jump out of the loop. if (Mxl.dwcomponenttype = = Mixerline_componenttype_src_microphone) {exist = true; break;}} }else if (!mixergetlineinfo (hmixerobj) hmixer, &AMP;MXL, Mixer_getlineinfof_componenttype)) {exist = true;} if (exist) { mxlc.cbstruct = sizeof (MXLC); Mxlc.dwlineid = Mxl.dwlineid; Mxlc.dwcontroltype = Ctrltype; Mxlc.ccontrols = 1; Mxlc.cbmxctrl = sizeof (Mixercontrol); Mxlc.pamxctrl = MXC; if (Mixergetlinecontrols (hmixerobj) hmixer,&mxlc,mixer_getlinecontrolsf_onebytype) return 0; else return 1; return 0; }//---------------------------------------------------------------------------long Cmixer::getmutevalue (hmixer Hmixer, Mixercontrol *mxc) {mixercontroldetails mxcd; MIXERControldetails_boolean Mxcdmute; Mxcd.hwndowner = 0; mxcd.cbstruct = sizeof (MXCD); Mxcd.dwcontrolid = mxc->dwcontrolid; mxcd.cbdetails = sizeof (Mxcdmute); Mxcd.padetails = &mxcdMute; Mxcd.cchannels = 1; Mxcd.cmultipleitems = 0; if (Mixergetcontroldetails (hmixerobj) hmixer, &mxcd,mixer_objectf_hmixer| Mixer_getcontroldetailsf_value)) return-1; return mxcdmute.fvalue; }//---------------------------------------------------------------------------unsigned cmixer::getvolumevalue ( Hmixer hmixer, Mixercontrol *mxc) {mixercontroldetails mxcd; Mixercontroldetails_unsigned Vol; vol.dwvalue=0; Mxcd.hwndowner = 0; mxcd.cbstruct = sizeof (MXCD); Mxcd.dwcontrolid = mxc->dwcontrolid; mxcd.cbdetails = sizeof (vol.); Mxcd.padetails = &vol; Mxcd.cchannels = 1; if (Mixergetcontroldetails (hmixerobj) hmixer, &mxcd, mixer_objectf_hmixer| Mixer_getcontroldetailsf_value)) return-1; return vol.dwvalue; }//---------------------------------------------------------------------------bool CmixEr::setmutevalue (Hmixer hmixer, Mixercontrol *MXC, bool mute) {mixercontroldetails mxcd; Mixercontroldetails_boolean Mxcdmute; Mxcdmute.fvalue=mute; Mxcd.hwndowner = 0; Mxcd.dwcontrolid = mxc->dwcontrolid; mxcd.cbstruct = sizeof (MXCD); mxcd.cbdetails = sizeof (Mxcdmute); Mxcd.padetails = &mxcdMute; Mxcd.cchannels = 1; Mxcd.cmultipleitems = 0; if (Mixersetcontroldetails (hmixerobj) hmixer, &mxcd, mixer_objectf_hmixer| Mixer_setcontroldetailsf_value)) return 0; return 1; }//---------------------------------------------------------------------------bool Cmixer::setvolumevalue ( Hmixer hmixer, Mixercontrol *mxc, long volume) {mixercontroldetails mxcd; Mixercontroldetails_unsigned Vol; Vol.dwvalue = volume; Mxcd.hwndowner = 0; Mxcd.dwcontrolid = mxc->dwcontrolid; mxcd.cbstruct = sizeof (MXCD); mxcd.cbdetails = sizeof (vol.); Mxcd.padetails = &vol; Mxcd.cchannels = 1; if (Mixersetcontroldetails (hmixerobj) hmixer, &mxcd, mixer_objectf_hmixer| Mixer_setcontroldetailsf_value)) REturn 0; return 1; }//---------------------------------------------------------------------------unsigned/*winapi */cmixer:: Getvolume (Mixerdeice Dev)/Get the volume of the device dev=0 main volume, 1WAVE, 2MIDI, 3 line in {long device; unsigned rt=0; Mixercontrol Volctrl; Hmixer Hmixer; Switch (Dev) {case waveout:device=mixerline_componenttype_src_waveout; synthesizer:device=mixerline_ Componenttype_src_synthesizer; Break Case Microphone://Device=mixerline_componenttype_src_compactdisc; Break CD volume Device=mixerline_componenttype_src_microphone; Break Microphone volume//device=mixerline_componenttype_src_line; Break PC speaker volume//device=mixerline_componenttype_src_compactdisc; Break Default:device=mixerline_componenttype_dst_speakers; } if (Mixeropen (&hmixer, 0, 0, 0, 0)) return 0; if (! Getvolumecontrol (Hmixer,device,mixercontrol_controltype_volume,&volctrl)) {mixerclose (hmixer); return 0;} rt= Getvolumevalue (Hmixer,&volctrl) *m_volrange/volctrl.bounds.lmaximum; Mixerclose (Hmixer); RetuRN RT; }//---------------------------------------------------------------------------bool/*winapi*/cmixer::setvolume ( Mixerdeice Dev,long Vol)/Set the volume of the device {//dev =0,1,2 represents the main volume, waveform, MIDI, line in//Vol=0-m_volrange to indicate the volume size, and to set the value of the volume to be returned with a percentage, i.e. The volume from the 0-m_volrange, not the absolute value of the device//Retrun False indicates that the volume size of the operation was unsuccessful//Retrun True indicates that the volume was set to a successful operation long device; BOOL Rc=false; Mixercontrol Volctrl; Hmixer Hmixer; Switch (Dev) {case waveout:device=mixerline_componenttype_src_waveout; synthesizer:device=mixerline_ Componenttype_src_synthesizer; Break Case Microphone://Device=mixerline_componenttype_src_compactdisc; Break CD volume Device=mixerline_componenttype_src_microphone; Break Microphone volume//device=mixerline_componenttype_src_line; Break PC speaker volume//device=mixerline_componenttype_src_compactdisc; Break Default:device=mixerline_componenttype_dst_speakers; } if (Mixeropen (&hmixer, 0, 0, 0, 0)) return 0; if (Getvolumecontrol (Hmixer,device,mixercontrol_controltype_volume,&volctrl) {vol=vol*volctrl.bounds.lmaximum/m_volrange; if (Setvolumevalue (Hmixer,&volctrl,vol)) Rc=true;} mixerClose ( Hmixer); return RC; }//---------------------------------------------------------------------------bool/*winapi*/Cmixer::setmute ( Mixerdeice Dev,/*long*/bool Vol)/set device Mute {//dev =0,1,2 to represent main volume, waveform, MIDI, line in//vol=0,1 respectively to suppress mute, set mute//Retrun false Indicates that canceling or setting the mute operation unsuccessfully//Retrun true means canceling or setting the mute operation successful long device; BOOL Rc=false; Mixercontrol Volctrl; Hmixer Hmixer; Switch (Dev) {case waveout:device=mixerline_componenttype_src_waveout; synthesizer:device=mixerline_ Componenttype_src_synthesizer; Break Case Microphone://Device=mixerline_componenttype_src_compactdisc; Break CD volume Device=mixerline_componenttype_src_microphone; Break Microphone volume//device=mixerline_componenttype_src_line; Break PC speaker volume//device=mixerline_componenttype_src_compactdisc; Break Default:device=mixerline_componenttype_dst_speakers; } if (Mixeropen (&hmixer, 0, 0, 0, 0)) return0; if (Getvolumecontrol (Hmixer,device,mixercontrol_controltype_mute,&volctrl)) if Setmutevalue (hmixer,& Volctrl, (BOOL) vol.) Rc=true; Mixerclose (Hmixer); return RC; }//---------------------------------------------------------------------------bool/*winapi */cmixer::getmute ( Mixerdeice dev)//Check whether the device is muted {//dev =0,1,2 respectively indicates the master volume, waveform, MIDI, line in//Retrun false indicates no mute//retrun True for mute long device; BOOL Rc=false; Mixercontrol Volctrl; Hmixer Hmixer; Switch (Dev) {case waveout:device=mixerline_componenttype_src_waveout; synthesizer:device=mixerline_ Componenttype_src_synthesizer; Break Case Microphone://Device=mixerline_componenttype_src_compactdisc; Break CD volume//device=mixerline_componenttype_src_microphone; Break Microphone volume//device=mixerline_componenttype_src_line; Break PC speaker volume//device=mixerline_componenttype_src_compactdisc; Break Device=mixerline_componenttype_dst_wavein; Break Default:device=mixerline_componenttype_dst_speakers; } if (Mixeropen &Hmixer, 0, 0, 0, 0)) return 0; if (Getvolumecontrol (Hmixer,device,mixercontrol_controltype_mute,&volctrl)) Rc=getmutevalue (hmixer,& Volctrl); Mixerclose (Hmixer); return RC; }