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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-a8c9-2e27eb9ec058, M7 e8 l' B" U- b( ]
By Mukta & ToxicDream
  1. 2 V& Z/ P5 w$ h0 v, `, c2 {8 {
  2. //for delphi 55 s- k, I2 j$ v
  3. unit MMDevApi_tlb;
    $ K* K+ T* Q! }

  4. 4 b9 b1 N- Z* z# }! c1 P
  5. interface5 h/ T2 Q& d7 B1 G
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    7 q# q. a8 W. e0 H
  7. const8 _" O& W( b( Z0 b
  8.   // TypeLibrary Major and minor versions
    * |: y3 b9 L3 y3 x0 F
  9. * C0 X; A  ]( s
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';6 ?$ g1 ~% V5 O8 ]- W8 c, I
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    1 {5 T; N( w8 z, S+ Q! ^* }
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    1 b4 Z8 S8 r2 y+ p" h7 l
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';( d& N, e6 n8 [- C9 J, O8 x% d! x1 Q
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';7 k! ^& C4 @* k- C  y% t5 b* i
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    % D6 j( z/ c- x3 R$ j
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    ! c- c! M; G# Q
  17. % ]1 w: C& M7 A$ `+ x- p
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    ( m' ~. A5 {* W, e1 N; N1 {# F. u
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;' Y6 q2 R. d7 n2 b! w
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;2 W% r' V& k4 T
  21.   DEVICE_STATEMASK_ALL                  = $00000007;  Z: `& u& h8 t0 I" Q
  22. / V7 S, l) d) ~2 b/ B3 T5 O
  23. type/ K+ _3 u! }# Q0 @) {2 V$ `- ~
  24.   EDataFlow = TOleEnum;" Y" G% J8 y: F8 w/ D# _+ x% I0 k
  25. const
    9 K6 R- l; c! z) @$ V# @
  26.   eRender                               = $00000000;0 i- C6 W, ^2 ~
  27.   eCapture                              = $00000001;+ B& J" a2 @1 g' v4 W# M9 ~/ j" s
  28.   eAll                                  = $00000002;$ n5 \' B* U' V, ^+ l
  29.   EDataFlow_enum_count                  = $00000003;& @0 O( z, {- O. i
  30.   C9 @0 y+ n* {1 V0 h
  31. type
    ( D' c' U9 ]" A' W
  32.   ERole = TOleEnum;: h: j8 I/ |" _0 C% j3 z& ~
  33. const
    ; K9 U! v: j) i' p* }
  34.   eConsole                              = $00000000;
    1 ?5 h* N, f$ j9 Z7 l3 h' U
  35.   eMultimedia                           = $00000001;
    6 R3 J% ?  `$ [* G& [& ?
  36.   eCommunications                       = $00000002;
    , K3 ?4 N6 z) D- v+ s
  37.   ERole_enum_count                      = $00000003;
    2 k! Y) J1 h. c( A' e9 L7 D* H

  38. # P2 l1 i. X' b! r; M
  39. type
    . [1 o* r0 a! e+ `" B$ N
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    % b2 c" i1 A3 o
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    . U( e$ P4 q7 i2 W8 |
  42.   end;+ l6 x+ V* {- X

  43. 9 \/ i9 `) X8 T" B. x  r
  44.   IMMAudioEndpointVolume = interface(IUnknown)1 p4 ~/ y7 s+ ]2 s' t1 K  V
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']9 D' b& F) C: [9 J
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;# ]+ X5 ~, t4 l
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;# O8 {3 H+ U& B- B+ ?
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;9 T8 s2 |- d; p& [  r$ p& M8 h
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;" T  M! |  }! ^0 W& }: h: b
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;- F3 E9 J% D) ^" T7 Z5 k0 A
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    ! r* S9 T# r6 [& h! D
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;* r4 E& X2 I; H% e& m- ^
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;; ], f' A* ^0 P2 v8 N
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;5 @* n- M; ?/ |7 @4 `/ U
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;% L5 o. n* I1 s
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;& R# z& H# j" Y* Z3 x5 Q
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;; @2 D7 I) i- T7 i
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;0 d3 Z7 n$ O. y  `# T# }
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;; i9 u7 n0 C; i" W& ^
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;9 Z- A" I- M+ b0 ]4 t
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    6 u6 L6 B: A' n8 ?9 M/ l
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    6 c6 N9 J( l( C+ D4 V
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    7 B" ]' \$ A; n2 U
  64.   end;/ @& j0 c* G+ j: W5 V0 D! B% \9 e
  65. 8 R- Y$ M/ @! w) ]8 @& M
  66. {  IAudioMeterInformation = interface(IUnknown). K+ e( z& W! i# X7 N6 K- Q
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']) {/ R/ Q& F2 a" }( A9 z
  68.   end;}
    - b9 Q3 Q1 s0 w% @' Q

  69. 5 s: Y0 p" M* _1 T8 C1 r, j
  70.   IPropertyStore = interface(IUnknown)8 ?$ f  `! S- m; u: I
  71.   end;
    % {8 U, f% Z2 w( n, |
  72. 3 i% u8 z5 X5 e  J
  73. type- F  o; c/ \2 Z
  74.   IMMDevice = interface(IUnknown)& {6 b: U3 H) ]( O
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    4 W2 w8 y( O' @5 O% t- Y/ ]
  76.     Function Activate(  refId :TGUID;
    # [  B5 m( ~6 z
  77.                         dwClsCtx: DWORD;
    6 s5 Y. W; a. c( B6 N
  78.                         pActivationParams: PInteger ;. l7 C1 o9 b9 S5 T1 \' g: j
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    8 G' u% n( |5 y3 }3 I& f& Y4 k
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    . r% S7 v2 C5 [0 \' H# |
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    5 i% b3 Q: ?8 O6 B- q
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    4 ?; x3 X3 x1 G; ?1 b
  83. $ v. S. J6 k( I* ~
  84.   end;
    8 }8 s) I7 u: o3 [3 O: U
  85. 5 O6 K' C+ ?8 d3 ?& m8 Z

  86. + z8 [5 w9 s2 l, f/ D( t, K
  87.   IMMDeviceCollection = interface(IUnknown)
    . P& Z, C/ k1 b: R3 f) w% E1 F
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    , s. W! i- V" `* \6 u+ b  t/ d
  89.   end;
    # x% {! C2 v) S! x5 H

  90. 2 h$ I) e2 h1 g' B( K. A
  91.   IMMNotificationClient = interface (IUnknown)
    5 j! x# p+ m# Y1 F3 j. o
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    ; Y3 @" v& s1 g9 Q- k6 h
  93.   end;/ m  i4 L: T. r

  94. ' b; F, h1 i5 Q' b8 t2 k
  95.   IMMDeviceEnumerator = interface(IUnknown)
    ( ~2 w! N( f/ `! W
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']3 c3 ^* |# P! ~7 g
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;' u& Y2 @9 S3 e7 z% S$ i* E/ N' w0 S
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;7 X: z. }7 r( q  D
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;( d1 y  n: t2 _* F  m
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;% _" C( `9 D2 `
  101.   end;
    + e/ G+ D1 q/ U# `
  102. 4 j8 e# |+ K" A" @  u2 b, u- n. [
  103.   implementation
    3 S% ?: b' X/ Y
  104. end.
    * N9 T. G/ M0 }2 D" w2 l' x

  105. 1 a' b5 L# k' ^( j7 z1 T4 T5 T
  106. Thanks & Reagrds,4 r* x  J$ d$ m' l
  107. Mukta ...
    ! R1 T# P* ?  P* |" _9 U6 s" Z
复制代码

  1. & s2 U; {, S# a* q0 v0 y
  2. it's work in Delphi 7" s) J( e) ]: T4 [8 I' F6 _3 }
  3. //////////////////////////4 G; H$ u, c4 M* T+ u0 p
  4.   p9 |5 N  D3 U' v0 _0 T8 @9 r& Y
  5. unit MMDevApi;
    7 r! d( E+ q# u9 z* R

  6. * x" ?: L; ^& m6 X( a6 g1 c
  7. interface
    # p* \) D, v- B' q& ]$ i3 y9 O

  8.   q2 {$ e3 }3 l; @% [% d
  9. uses
      M) P( ^. }# V4 B: S" X+ L- C0 ?
  10.   Windows, ActiveX, ComObj;
    5 F* \9 O1 [% ?& y. t+ f6 \

  11. $ G. a8 y$ t* D" d
  12. const
    % r2 V! D6 X7 X. ~  }" M
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    $ O, T' \" t, r
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';  ~! y$ n& R" }* [- |
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';$ o  I+ t# m- T" r/ w4 T; \5 j" f+ k9 [
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    . P6 r4 e: L+ r# ?( W1 g8 o; b
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    " D. {$ y+ Q) G+ x+ A+ G7 q3 S4 C
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    ( L8 \& o: g% |& K
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    4 K5 _- T! ~( m. n( x1 S

  20. . @0 F& X4 ?" E& O) |+ Z
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    9 N0 R  N/ S! j$ v, t
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;4 S, O1 V# j; E7 M9 Y, U
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;/ ^+ Z- l) G# G5 x1 Z; @" Y5 w' g
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    1 \. C  C$ t" w; ]* ^6 g
  25. # R6 _5 l9 ^6 V/ E8 s6 A* e, z
  26. type
    2 B, x) a  Z7 Q" e
  27.   EDataFlow = TOleEnum;: ]8 N( x( c. J; |7 e0 ?6 Y, v
  28. % [1 \- j: ?3 {9 ^! q" \
  29. const2 {1 h* e7 h" w0 S; z1 b
  30.   eRender                               = $00000000;
    % o8 ~& d9 J, L- \2 W4 B
  31.   eCapture                              = $00000001;# J% n# ?! ]2 z) V
  32.   eAll                                  = $00000002;5 }! i- U7 r) U9 W8 r& R
  33.   EDataFlow_enum_count                  = $00000003;* ~7 m/ M' E% i1 V# q! [3 `9 y

  34. # T* k+ @2 M1 g3 x' ?/ t
  35. type
    7 e" t' j0 y( z
  36.   ERole = TOleEnum;
    ; d2 U/ v2 o" x: W3 C6 V" T/ H
  37. ; O  D4 w; K% E  c/ S" p/ A
  38. const* L& j: z6 Z. k; n
  39.   eConsole                              = $00000000;% C' `/ b- O6 T+ ~+ ~% |8 k8 g
  40.   eMultimedia                           = $00000001;
    % d* K8 P& v$ R5 Q( F
  41.   eCommunications                       = $00000002;
    # |  C. W7 [) S% p; G
  42.   ERole_enum_count                      = $00000003;5 c7 V% b8 }5 [5 L- f* K

  43. 0 E% K9 i; r" ^0 L& i' ~
  44. type
    $ |0 r. V- ~- d8 I5 i, S, b
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    ( Q3 ]( F5 T( }4 w0 Y( E/ h! f
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    " o/ K( C" F! R! s. `7 `& u
  47.   end;% N, u9 @* I9 d) O) e
  48. : y) z" X) F. M
  49.   IAudioEndpointVolume = interface(IUnknown)5 M" @7 N% |2 c
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']- _+ r* S+ C3 Z& H, x  u
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    5 \' W9 N5 ~/ D: R4 c5 p5 R! M
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;+ c, j$ S' ^6 A1 b5 w
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    - R- S- f7 s+ x, ?
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;+ T6 [8 d& `" L  g* E" f0 J& m
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;7 |& n! ]9 o4 K# p0 f# Q
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    2 T& M, _5 d1 y& ^6 _& h4 X5 }
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    % O& @" D( F# c- R
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    7 G0 I7 v4 Z' ~- C* k
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    . q5 ~3 E5 d7 M" |3 q+ _
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;& h3 T$ k5 X# b9 ?
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;1 I3 c4 t' y8 F# G
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    , T  l/ n- m- ?# ?. b' S- n) }
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    ) j  G- C5 X% U$ @" ?$ M7 A& b
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;0 D9 s# O; y; n6 y
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    % F) p: [/ O- [' T5 ?# ?3 G
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    / b, r$ _: p* T, T9 M0 }/ ?
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;1 d' g, \+ ^8 ~1 ]" ?. B
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    9 x6 W7 H7 ^( h" n2 C$ e! N& p
  69.   end;
    ! a% Z$ A  M$ l- b6 B
  70. 4 d1 L" K) r8 F. O
  71.   IAudioMeterInformation = interface(IUnknown)2 N2 H0 s$ j- L# ^! u
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']0 x) h& o, ]& R5 E
  73.   end;- C' A. s- l2 ^

  74. ) I/ I7 J4 z3 j9 }( ]8 y7 B
  75.   IPropertyStore = interface(IUnknown)
    , D9 e- C& f! @: Z. N" B
  76.   end;9 A* T2 {& S/ X, z1 z
  77. ; L4 z) s. G( ^; T  ]! C7 N$ m( J
  78.   IMMDevice = interface(IUnknown)0 k. e5 T; y, d- T
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']; }  x8 ]8 D7 R! q, [2 X
  80.     function Activate(const refId: TGUID;4 }: Y  k, ]9 ]+ m- G0 |+ x5 Q) F
  81.                       dwClsCtx: DWORD;
    - d5 D( l' t4 {$ @7 }
  82.                       pActivationParams: PInteger;# J! L) }. Q  t$ q' g$ G
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;# n" u# v8 R" W. K; ^' z, t: V
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;! F8 P/ s2 T) M4 l6 Z, ~
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;' t8 x# u- `! r7 a5 G9 m
  86.     function GetState(out State: Integer): Hresult; stdcall;
    9 B' k1 r" l/ |* d
  87.   end;
    % S9 o4 ?. x; M2 o5 d
  88. 1 t( b" |- p; d' E
  89. 0 ~) A3 s, ?# `, F6 H0 M
  90.   IMMDeviceCollection = interface(IUnknown)( t/ _; [( ^8 y$ ]& c
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
      G, z$ z' z* b% g' o
  92.   end;/ c2 A& a' k# ^$ [+ H
  93. 5 D. F1 k, k8 d5 T1 u) K9 G: ?9 v
  94.   IMMNotificationClient = interface(IUnknown)7 O" C5 f  G) K! N0 O$ T
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']$ x# W- `1 Z3 n8 c' w5 |8 i
  96.   end;8 V, E! w7 l5 X
  97. + Q; g& ]2 N5 F- Z$ \
  98.   IMMDeviceEnumerator = interface(IUnknown)% I, o# Z( T1 [+ W
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    : z/ E! G# L1 Y
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;$ b, H% Z4 H0 j' F" s$ K
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    + j) g. l( v7 ~  B5 U1 U! t
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;8 B7 n+ K1 B2 ^2 [
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;7 V+ _: O) Y' Q' n0 ^- X" m& ~# q! H5 @+ m
  104.   end;" a$ }$ P& d0 r# `* l

  105. % T% @. N* w% @# s, R% J) J" F
  106. implementation
    . ?2 t9 o. m2 \
  107. : s* A3 M4 V; i1 y9 C
  108. end.
    % B7 t- L  }7 ^" s5 Z3 U
  109. $ b5 C& v% L3 G* m
  110. ///////////////////////) y3 d5 [. L* s2 g* R3 f! A
  111. simple sample :)
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  112. ///////////////////////
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  113. ! m: w' q! o4 S/ L
  114. //...... other code/ y3 V3 z) k2 W2 j! C

  115. ! @9 n- M/ w7 G1 j* [
  116. uses ... ActiveX, MMDevApi, ...;
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  117. " F) d. x7 m* n4 \/ R9 }
  118. //...... other code
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  119. 9 T0 o* Q  G$ \9 S
  120. var
    ( W2 h% c& g  j; R) y0 Y  O  N+ w
  121.   endpointVolume: IAudioEndpointVolume = nil;- \" F$ C. l8 l  w9 V

  122. 8 r$ Q9 k. o$ I  A6 g# r- _3 f/ P
  123. procedure TForm1.FormCreate(Sender: TObject);" A& t: m7 x, y  I& C5 F
  124. var
    7 W- |5 u/ n  @
  125.   deviceEnumerator: IMMDeviceEnumerator;% t0 {. C7 K# P" V
  126.   defaultDevice: IMMDevice;
    # T& q7 M0 B% ^6 y
  127. begin: s3 [6 B3 \% P* |' G
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);2 S( `2 |7 t  D2 U. B
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);9 a  J+ J: a: W5 ~% Q0 m
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
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  131. end;
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  132. % [3 e5 W+ H* e! r
  133. procedure TForm1.Button1Click(Sender: TObject);0 {1 K" D# T' y# \
  134. var" [1 ?. K, x; Y
  135.   VolumeLevel: Single;& Z3 g4 j: z7 q# S6 L
  136. begin  p  v0 M- m! C2 u9 S% {) q3 V8 r* N- K
  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;/ n2 j+ r! g; G' B; w" _
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])1 P$ f# ^! s. T: @
  141. end;
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  142. 3 b4 a2 D2 _2 n" I. j% p' M
  143. /////////////////////////////////////  j4 d% t/ y: }5 y7 F/ i( w  T

  144. $ C6 M1 m+ Y0 B+ _# a8 }9 i8 o
  145. // with best regards ToxicDream
    * X# e. m: U( C' N9 P; y$ Z  S
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