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计匠网论坛»论坛 › Computer › Program Language › [转载]Vista volume control using delphi 5 & 7
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[转载]Vista volume control using delphi 5 & 7

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bini
发表于 2009-6-2 16:03:58 | 显示全部楼层 |阅读模式
来自： http://social.msdn.microsoft.com ... 9-a8c9-2e27eb9ec0583 c/ s  S& B, K0 U8 }. B8 G0 q$ X
By Mukta & ToxicDream
  1. . D) d* X: V  s
  2. //for delphi 5% b1 F/ a" l( ?4 |, P, A+ G+ ~8 g9 N
  3. unit MMDevApi_tlb;
    $ \3 x) s4 N6 X% M

  4. * ]( m9 }; W( G4 ?
  5. interface' b, A, V* x7 \0 e$ ^4 o
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    2 Y" w! c( X5 W  Z6 [
  7. const0 X( S- Z6 H% p; X3 M( r; w
  8.   // TypeLibrary Major and minor versions
    6 ~2 z  H3 [$ C

  9. & Q5 ?( H" F+ z- T* s8 }$ ^
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    " l% A1 [/ l/ `" i+ b1 u- r
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';- H( b- f2 v/ S0 F
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    5 J4 q# Y( w% ?8 H7 g, c& \# w
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';: H3 A" p5 y$ N) E! I
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';! h& _. W, @* L; i- x+ ?* I8 r* x: w
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';7 o# p# i( j4 T) L
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';* `: r, y( g. j' u- y6 s
  17. - C( y1 V1 e/ k1 i
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    " N" t( c& B4 w5 B+ l8 B
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;$ @3 R! q3 U: n; o6 P
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ) j' V8 _, `9 @( v; h6 c
  21.   DEVICE_STATEMASK_ALL                  = $00000007;7 c7 B+ b; k4 s5 v$ T

  22. ' Q( S1 u5 Q, a
  23. type
    $ T, A" {8 k# x, f  F- t
  24.   EDataFlow = TOleEnum;
    4 o2 M) D1 o: d, r
  25. const/ f' f* E% ?7 [" t' l6 m
  26.   eRender                               = $00000000;
    0 N8 O# A' P4 _) p
  27.   eCapture                              = $00000001;
    8 S: ?+ l1 R0 k/ z
  28.   eAll                                  = $00000002;! t& ]# g4 q2 }9 ~8 R' H7 A
  29.   EDataFlow_enum_count                  = $00000003;
    9 E/ r4 [& t2 I& K

  30. $ q6 @$ W# u4 w* m+ f
  31. type
    & W% {# z5 Q0 Z0 M! \9 H
  32.   ERole = TOleEnum;5 I) C5 L3 A( D* g/ g% I
  33. const
    7 e) A1 S  r4 G$ I
  34.   eConsole                              = $00000000;. e8 A" Z1 {' ?' T- r
  35.   eMultimedia                           = $00000001;1 V" q! T/ i8 W7 _
  36.   eCommunications                       = $00000002;8 I' _1 w' k8 o6 k7 e% P
  37.   ERole_enum_count                      = $00000003;
    ( i% W! b5 F3 J: R# ~* |

  38. # @3 \- W4 Z' C  U
  39. type
    " F# J& h/ Y4 ]) u' c
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)2 E3 w& z8 h  N( n3 y
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']$ ]6 j8 T( h/ d6 y+ `" z
  42.   end;& D% K8 u) ~( Q3 P! [  j( _

  43. ( v* Q8 S# j& v! @
  44.   IMMAudioEndpointVolume = interface(IUnknown)# p& I7 n+ @  j" A$ B
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    2 E& R$ A& w# d: D( L! P' c
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    3 n* I# T1 {" h
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;2 f! {) `7 |2 P3 r# e/ E
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;! P2 H# F) q  V# T# S# m& ^; H
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;; i. P1 c7 o$ p$ }
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;, @7 @" L  P; y, r* R) Q9 u
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;* H* i) W& X4 x7 v  O" F
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;  ]2 @/ h0 n- N6 r0 y3 W
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    & V' n- g1 ^9 [6 B' c0 T
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    . y0 p" S7 @8 f2 B5 W) Y* O
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;) Q& }0 e' _1 i' a) F
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    ; Q$ G6 h; h; W. }! N2 M3 R: M
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    & _  P- ?; _- m
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;5 D4 r8 ^0 e% z' C$ ]$ U
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;( n3 F5 a  f; f2 X9 r
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;/ Z4 w: e5 A8 @& a9 V$ z) L- o
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    : |$ K6 q( M4 r" _
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;9 L$ ]; H- t% H! Y5 Q
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    $ @: U* [# ^5 ^7 p
  64.   end;
    0 r: C' J# H' Y6 u

  65. " q3 K0 L- ]5 d
  66. {  IAudioMeterInformation = interface(IUnknown)- r2 `6 ]* A% x: ~) w
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']2 c( H) {& B, s+ c, H! m7 y8 w8 N
  68.   end;}- }, {1 d7 o2 z+ H7 b) `& v
  69. 1 F  h3 j) d5 I. r8 n1 u* @) d" ^
  70.   IPropertyStore = interface(IUnknown)4 @4 ?# g  M5 ^" I; H% \
  71.   end;
    3 v# C9 m; U+ e1 j" o
  72.   P+ k  C' j3 F2 f! j' c
  73. type
    2 R) [6 h' |- `$ B9 R
  74.   IMMDevice = interface(IUnknown); \# p: m2 O/ B" f1 K
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']; c2 r' \8 x9 B& h. O) L
  76.     Function Activate(  refId :TGUID;; d( s) a- ~! L& t! R$ o) Z
  77.                         dwClsCtx: DWORD;
    % q' e: ?2 V/ v- o4 \2 {
  78.                         pActivationParams: PInteger ;2 H5 I+ G% H! y, r
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    * d- m5 s2 z- l" P: A* i  V8 ]/ ]
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;- i* _0 W% H$ _$ [& z7 S
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;% e0 j- r6 n) Q& W: _/ K
  82.     Function GetState(out State :Integer): Hresult; stdcall;; ^' H# h( o; T6 j8 @

  83. , v2 p/ C0 N% ]
  84.   end;
    % ^6 y9 y2 X: t3 }9 C7 G9 ^# i
  85. " S* l: Z" W  _" Z; s

  86. * z6 O5 {0 F; i
  87.   IMMDeviceCollection = interface(IUnknown)
      f8 i$ V0 {# d7 ^" ~" o. n
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    4 p; E3 m; j1 I" b
  89.   end;, ]' z# [1 U) j( F& m
  90. * b1 _: W. r, V/ w' g
  91.   IMMNotificationClient = interface (IUnknown)
    " ~9 I/ B6 B. {. ]3 x# G3 t
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    5 H; M$ \0 f: D: u- o
  93.   end;. L4 F& y5 f2 |- ~2 g8 }: @

  94.   B& A7 ?/ |$ @4 n9 ~+ X
  95.   IMMDeviceEnumerator = interface(IUnknown)
    5 i1 i' a) x6 o  l
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    0 U& M+ q. f# K5 d
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;/ ~. S4 r1 Y" c# {8 n
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    * v. B4 B* _# G* o
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    . N9 |" A3 l5 @- R" w! H( Q
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;  Y0 h4 _$ `  u/ U& L$ d- {9 t7 }
  101.   end;- a, C/ v8 r/ ]3 g( }) `2 G

  102. ( R! D% F. i9 ^6 |+ S! \0 r
  103.   implementation
    + Z) {( P/ g; Q" J
  104. end.
    . A8 s/ n, m9 O' `2 O

  105. * O$ i: K8 m& z( N1 @
  106. Thanks & Reagrds,
    * I) B+ d( Y  w* d" K4 E8 q- x
  107. Mukta ...) s8 s# h) @9 _7 d
复制代码

  1. 2 f2 `/ g6 ]& ^: F3 U( z% }, y9 k3 D
  2. it's work in Delphi 7( G0 I7 v; p( g: ^
  3. //////////////////////////
    ) A2 S: m7 k, H* q* p: }# N

  4. 4 S+ E5 o- @. I! n! [  a9 U
  5. unit MMDevApi;$ F5 k( X) f% c0 O: b: k

  6. - e9 d4 W. t7 ~2 C2 [& K
  7. interface
    + ~) B3 |: w% b: m. Z* l* H

  8. ( P1 G/ v: N- d' X& O
  9. uses( v/ F3 j" Z& o  ?  C
  10.   Windows, ActiveX, ComObj;& c1 B7 q, [" S) N& ]

  11. 7 W7 U7 W5 h1 ~# R- {
  12. const+ M" k( ~. W9 a) {. n
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    % f2 K  r6 j4 X7 I. i4 ^9 f& F
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    9 s3 ^! I# ~. F/ F. V$ j. e
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    : m& s, [1 D6 {  _8 T) z8 I- r
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    + R  x4 b/ {1 T1 B
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';8 I: `! v6 P6 L. k0 r
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    3 {5 g& A6 Z' D' U/ `0 R
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    4 N4 C7 G4 x+ [
  20. + m" c- `0 }9 m3 x% l
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    % R9 r  H$ V6 _% w9 Z1 @
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;3 ^! ]1 m5 ?7 _( S. O% {. l
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    6 S- k; K6 {  T1 W- C6 C% G7 S
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
      ]: x2 u4 B- v  `. A( X" C

  25. 1 ^9 g0 d% @* V* |1 S% v7 E1 b4 D
  26. type
    ( _, W# i8 ]: s5 p6 j
  27.   EDataFlow = TOleEnum;
    * F' K/ l' i" P6 t& s
  28. / i+ _( s+ T* L, s1 @8 H  @
  29. const% Y8 G* M9 k2 t6 T
  30.   eRender                               = $00000000;
    * a) t; O: p& s( }# |- I
  31.   eCapture                              = $00000001;
    3 `6 }' z) I2 p  G
  32.   eAll                                  = $00000002;, l/ u# }9 U: z1 h, [5 {
  33.   EDataFlow_enum_count                  = $00000003;
    8 z& i& U) G# B& a& R& b3 p% `

  34. ) A! R/ T# ?- @, h
  35. type) u0 I, c8 @: V2 T4 |
  36.   ERole = TOleEnum;
    + c9 t4 ]" [  X$ a
  37.   f7 V7 k2 {3 f# Z
  38. const
    8 @7 K" ~6 s+ k" C2 H4 Z* t$ q# ?
  39.   eConsole                              = $00000000;
    " c. r3 T2 k2 U/ P1 t
  40.   eMultimedia                           = $00000001;) T6 z$ O+ r! D7 h
  41.   eCommunications                       = $00000002;
      \! [5 k5 g7 B* C0 E, F* h0 K1 _* _3 h
  42.   ERole_enum_count                      = $00000003;
    7 @* S# {1 q  _) W6 V; u* q' V" B! s

  43. , W5 e5 e+ g5 C9 r# ?5 [
  44. type: i9 Z: r$ a+ g
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    ( t- Q5 O6 W$ T9 H8 v4 l$ i, X+ o8 p
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    * p+ H& \% X* e
  47.   end;
    ' e( q' z1 v4 \6 I  C4 I9 l

  48. % K! Q; r7 r8 |% c" g3 P
  49.   IAudioEndpointVolume = interface(IUnknown)
    & y6 F/ p' J8 @6 r$ s3 V! J
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    3 v: T: N$ B! A
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ! y# @4 P7 L, r# c6 a
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    4 F! x- b/ l+ P2 Z' }
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    3 T) h1 W( J, O, b
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;& [+ m& K' K0 t+ r
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;0 b' Q0 e* K0 c5 _
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    * {1 h+ Q1 y5 ?; s; V
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    1 K: G% F+ f. S2 I
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;  R! V. h. h7 y9 A
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ) R$ }% B4 S/ P5 J
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    ' G% |% @  A, Q) e
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
      ~1 D$ z. X  m
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    / ^) A# i$ K$ h7 F2 F
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;$ m) P9 y. Z& r: M, J4 ]; E, d
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;9 b  t5 H; p" A1 H
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    0 D2 u* x# K% V* H* y$ i
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;' i" b% ^- ~$ _% W
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;/ x( S# m( j. f3 n/ i; P6 @: j
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;- x/ B. }) ~, A( [1 e2 T7 Z
  69.   end;
    ; M" m) E* J1 @7 ]' t
  70. ! q% W9 q; S/ W# J5 h
  71.   IAudioMeterInformation = interface(IUnknown)0 L/ _  X% d* o3 ~. M( O3 \
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    , j, w: _* M% P4 N+ R7 w/ O
  73.   end;
      B* M2 ]$ H* L/ Y6 {' @2 m
  74. 0 l" h8 Z3 u9 U/ G3 t+ E
  75.   IPropertyStore = interface(IUnknown)
    8 g. M* c, R$ m/ E
  76.   end;3 @5 f" ]% H$ A$ p  P+ U

  77. 0 k% G' P- I3 A7 p, b0 G
  78.   IMMDevice = interface(IUnknown)' N6 a6 T8 c( T& r3 Q8 h" F
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    " b; ~" p* x( Q0 W( X+ ^( I* H
  80.     function Activate(const refId: TGUID;
    . n0 j; R/ ?& I, w7 }) F
  81.                       dwClsCtx: DWORD;
    0 N. B% B2 k. @! H; _
  82.                       pActivationParams: PInteger;5 u4 Q0 @$ `6 Q& S% i' D, v8 P
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    4 G' F$ \* l% }- i
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    % J( r0 ?6 n0 V1 W8 o) Z1 x" a
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    $ Q8 Q+ E/ Z2 {+ C+ u
  86.     function GetState(out State: Integer): Hresult; stdcall;1 D9 \3 e6 `- y% r  I0 d
  87.   end;
    4 Y! B  i2 }8 R" g0 ?  x: F

  88. : N% O/ F  K- r' ~. W

  89. 7 o" o4 i7 K, b; Q- j
  90.   IMMDeviceCollection = interface(IUnknown)1 B* Z- G) i4 @' r0 K
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']# M3 Y. T( s( c" `* Y9 M; D
  92.   end;
    + d- X+ ~: ?4 J- _) Y
  93. 9 M- b) E0 L) H3 [/ s. ]: F
  94.   IMMNotificationClient = interface(IUnknown)9 Y& g4 O2 a! h
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']  z% G7 r8 @* ^- E! |6 c
  96.   end;
    ( M9 t; n0 C$ q1 V

  97. ( `0 V6 L- y7 X
  98.   IMMDeviceEnumerator = interface(IUnknown)
    / n: t" s( {1 u: K# O
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']5 L$ l; }3 v- @0 G+ b8 b
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    & e6 i3 b  L1 x
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;1 q7 A1 P2 W3 p% d2 t
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;7 U4 z8 r* p9 _6 _9 Z1 X' I' x2 z5 Y
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    $ k! t8 U) x! U( g6 k
  104.   end;; [" o  J8 ]& r! \+ b2 |  O' h0 O
  105. + L" i4 A/ _5 l- S+ H* h
  106. implementation
      ^3 O- p: I, h9 T0 G

  107. ) d0 N. h! |( M3 S# X
  108. end.- c$ w. q0 T% X# F8 M

  109. / O! U% h# |3 }/ o2 x
  110. //////////////////////// I0 u% T+ o/ |
  111. simple sample :)4 @  @: k  C; b! P, B$ t
  112. ///////////////////////+ `6 c3 z3 m& D* b; ?! a7 O- Y; h
  113. - f2 L5 |% O' n% S0 z1 ?8 A' n
  114. //...... other code
    0 p1 r+ D2 ~) j% {' Q& B: ^3 x
  115. 1 m& z5 t( v9 d6 M. d! {
  116. uses ... ActiveX, MMDevApi, ...;, }- S) q6 p9 T/ R9 `" Y

  117. , W) x( f6 v, b8 d
  118. //...... other code! m, Z5 }& _, d' \5 j
  119. ; |; ^) Q" m" }- T
  120. var& Q/ O* w* u5 T+ M
  121.   endpointVolume: IAudioEndpointVolume = nil;3 m* n  a' k& i" T+ M7 T0 g8 M; A
  122. - S/ \4 `6 {. M# Y" Z7 n: ]* n+ J! f
  123. procedure TForm1.FormCreate(Sender: TObject);
    2 O0 {' c/ x; m9 C0 o
  124. var& c. Z3 K5 _/ F: Y' S
  125.   deviceEnumerator: IMMDeviceEnumerator;! F$ ^* H7 @& A
  126.   defaultDevice: IMMDevice;
      V8 b2 T9 j. n, K0 }5 O& T
  127. begin! f3 L/ ~& |! w
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);5 V) f! V0 V5 \+ t$ y
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);7 ?# d! D, ^: z* U
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
      d0 M# ~: w! T4 V& `/ M
  131. end;- S2 n$ T4 A( ?: C$ y

  132. ( G$ d) G# x9 f, P
  133. procedure TForm1.Button1Click(Sender: TObject);
    7 x  U- g* P8 k) n9 G
  134. var
    ( }+ ]& c3 Z! @' `3 M2 a3 h6 l
  135.   VolumeLevel: Single;) b7 k* x  A" H; P8 x1 K1 s
  136. begin
    $ ~; ]6 J6 w( q1 c; d! G+ h. X
  137.   if endpointVolume = nil then Exit;
    2 Z% i8 W0 A' [9 f9 ?1 u
  138.   VolumeLevel := 0.50;; r3 v' T. P5 q1 p! E, p
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    # T! \" _! q# i$ L! j* D2 n! I
  140.   Caption := Format('%1.8f', [VolumeLevel])
    " b/ a  ~: a' P) M- l  c
  141. end;
    - r% x8 J! |+ K! [8 Q' z2 t+ W6 n3 x

  142. 2 N! s% P( I' f1 ]
  143. /////////////////////////////////////
    9 j' O$ Q* k1 R; v9 J  i

  144. ' p) H0 J+ J, G! r1 F0 j( o; i) e
  145. // with best regards ToxicDream
    : N; S' ^$ c% B! `
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