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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% M; G* J2 m& Y6 W  e+ I, B' X! w6 E
By Mukta & ToxicDream
  1. ; Z1 Y, y9 U, @7 u+ L) M
  2. //for delphi 5
    # ]& ?, ?9 i+ F+ I
  3. unit MMDevApi_tlb;
    4 u8 K" `4 M2 a" x
  4.   L: H  Z6 N7 a: ^+ P
  5. interface
    ) a) ~: p/ W7 M: e8 O% r# s
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    # I& W3 ]/ F7 {7 p1 _! t7 }
  7. const
    8 P6 I# S0 q  u4 d2 Q8 A9 f5 x2 |
  8.   // TypeLibrary Major and minor versions, r) E3 f8 ]9 C7 f3 C$ H9 o

  9. , K, h' ^( ?, v  \# J  ^
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';* @6 d& A8 @0 i* u. D
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';6 a3 s) x2 y/ R0 y; y
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';# l3 `; R) j- R
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    & ]' M" G1 Z$ O* s3 s8 O6 Y
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';4 v  m0 S  z. T4 v  A
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    - T2 a* H3 ~0 x: ^7 l5 `7 U
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    # m" Y9 Y: y1 o$ x/ ~, N

  17. 4 c) }9 n! T) s! S7 d
  18.   DEVICE_STATE_ACTIVE                   = $00000001;' A  A+ q2 s' |" }
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    ' a3 X; {: }' p# W% O# I
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    2 V. f5 z0 [* B8 t+ r
  21.   DEVICE_STATEMASK_ALL                  = $00000007;% S2 q0 G  P/ k8 I1 J9 ^9 F& t6 P) p
  22. ) ~( x0 x- ^- X/ B8 _( L
  23. type3 O6 ~# s) H- ]$ ~( d8 D  M1 C
  24.   EDataFlow = TOleEnum;- L* X3 a+ k8 b& J; n
  25. const/ n+ ~+ t6 O/ r4 ^! ?, D: P4 y+ I
  26.   eRender                               = $00000000;
    0 m/ t% m% [/ d6 d  S4 e+ ^" u$ k
  27.   eCapture                              = $00000001;2 O* b  m' m, @! i! g" ~( h( Y
  28.   eAll                                  = $00000002;
    # F1 j, ]/ J4 N  N8 m
  29.   EDataFlow_enum_count                  = $00000003;; m0 X$ l# F4 B3 j7 \1 t

  30. ' Q  g; g; e  w% ~( C
  31. type
    8 @. ?2 f4 i, N8 ]. H! R
  32.   ERole = TOleEnum;
    / K" d9 n! t) p/ t8 T
  33. const
    & i) d5 H: n+ m2 W$ H
  34.   eConsole                              = $00000000;
    ) L  x: L8 h3 Y0 S
  35.   eMultimedia                           = $00000001;% U5 d$ D  X" _* S) W1 k# L% _' }
  36.   eCommunications                       = $00000002;% i4 A7 r5 J# X) D# I! O
  37.   ERole_enum_count                      = $00000003;- _( }/ E! _. y1 o" a# b1 D1 S
  38. 6 F- |! B  Z* e0 Q+ C+ ?$ Y
  39. type
    + l: q: J3 D/ J! ]/ m. Z5 Y
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)2 e3 G: Y% x+ ~! M% W, c& K3 `7 B( |
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']; c- W. \1 K& S
  42.   end;9 n. U8 i* F; u  N7 Y

  43. ! v/ x( N( l) m" h# p2 f6 _1 O
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    2 c! m9 S9 B- a
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']% d3 m) L; H, i! K5 R2 i
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    " w$ s! O1 |1 K2 d, }3 E) N
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;9 K3 @  M6 i- ~: z% A  ]! ~3 I4 }
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;2 ?6 x+ v5 M; V2 g0 m9 ^
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;( j. N2 v1 n3 Y
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;3 ]" E- e& }3 S
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    ! f, U- g0 r1 c7 W' G1 D
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;2 Q3 `1 M6 C0 B% A) l) z& G. j1 S
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ; r. p. D& X9 A& u+ t1 t$ }+ `
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;% k; a5 f, o  h$ n1 p3 g4 F: Q0 a
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;% C& [6 K% \! J) K5 j  z& f- E
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    2 S) a6 Z) }( b6 H; G
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    : @6 U# ^/ y- w3 m2 O
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;  ?9 u" X7 K  e$ l
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;1 r! t* G% V0 M* ?9 \3 K1 l. q
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    & _# [! ^5 q% Y4 }
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    & C7 T3 a) n7 F, E0 z/ m: K
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;, t5 M1 r5 o& @$ w
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    $ L0 @& I4 z/ F1 y3 h' W0 e
  64.   end;
    0 Z5 ~3 v1 X' D( D4 D; _4 D

  65. $ x1 r+ u# P; a2 R$ j
  66. {  IAudioMeterInformation = interface(IUnknown)! N4 h7 B/ Y% [# P: j
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']. b$ j3 t% |& K/ g6 W1 c) W2 y
  68.   end;}
    / X1 D5 z* Q) y+ `
  69. & s( a, F$ E- s$ Q* O) [- |% w1 {$ D
  70.   IPropertyStore = interface(IUnknown)
    * n6 O- x1 Z1 M5 Z
  71.   end;
    6 a' R0 [/ P5 A2 a
  72. * E0 C* s, g: E4 Q2 M: T6 s
  73. type$ h, v# ~3 V$ A. u. B
  74.   IMMDevice = interface(IUnknown)
    & P, ~/ c$ N5 l- x3 m+ v
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    % Q; B. S/ ]2 H; R2 z  o" V! Q
  76.     Function Activate(  refId :TGUID;; V8 `* D- [  v  C
  77.                         dwClsCtx: DWORD;+ m+ w5 k/ S' Y+ f8 A
  78.                         pActivationParams: PInteger ;
    0 n7 s% V  t$ U% n9 b3 g% U
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;8 K9 c- G+ M0 k
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;9 |- r2 D. [3 T' o5 |
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;7 o- ?  R5 v7 W! B
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    $ P8 S% N( ]; e6 t
  83. + G; V0 }" H' ?7 M
  84.   end;
    7 _* n3 Q5 Y5 L. J0 q! ]5 ]$ [
  85. / ]8 i6 g0 ^# A. ]# g9 j

  86. % c: X" p5 J! h4 t: w
  87.   IMMDeviceCollection = interface(IUnknown)
    ( B/ X- G) m' E" }7 `
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']/ R2 o6 G$ O: {
  89.   end;
    ! P+ r# d3 d  q

  90. * G+ g% Q$ K( j# z/ M# K( Z) ?2 v
  91.   IMMNotificationClient = interface (IUnknown)5 u- d% b! P+ e; Z5 K2 a
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']4 t7 b7 o4 j, a) H
  93.   end;; Q4 A# ~0 W0 i& {
  94. - K' a6 z; X9 q
  95.   IMMDeviceEnumerator = interface(IUnknown)9 r% R8 V# `" p- t0 @2 U  ]
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']& y* K1 N" n& q7 [: U
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;0 x9 Z: Y. G" y- p# m+ i0 p
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    9 B: X' P) I* J
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    : c2 `, |5 G. s' n$ J9 N
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    ' G# t5 s/ u$ \1 t& V
  101.   end;8 k+ m" `7 C" p: |
  102. $ M2 `1 D6 @* Z0 u6 [( K& Y0 j7 Z6 Z
  103.   implementation1 Z# s2 k! Z3 M5 K& E! @$ z
  104. end." _. h1 e# s1 g3 ^' I

  105. 1 X/ T& ?- c0 `) q
  106. Thanks & Reagrds,
    2 D( S6 F: w) |, {' R/ f4 U) a# N
  107. Mukta ...
    8 ?4 o! p/ _& y9 T7 o4 J6 g! @* X9 p
复制代码
  1. 4 ]- H+ Y3 N  r
  2. it's work in Delphi 7
    ( c5 q" o6 W  @8 a+ A/ t, Z
  3. //////////////////////////
    8 A( {; _0 i% m4 X8 K
  4. . T+ g1 G5 b2 _, m3 d* {, u& [% d
  5. unit MMDevApi;7 i9 l& B, Z% \. v, t
  6. ; i7 M; R& V4 x0 b
  7. interface
    ' n4 I+ `4 H5 }* G7 J; ]
  8. 6 b( [9 D1 A& M4 Y, j" @5 q# @
  9. uses! x, W# n+ E" ]' M+ T; d! t# k- J
  10.   Windows, ActiveX, ComObj;
    2 a0 v. ^7 P1 {+ Q  T/ `5 D

  11. $ e& _* K( i6 t) z7 c7 I2 \8 }& K" R
  12. const
    ; n' h8 s" Z, I
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';% c0 S+ a& t, O
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ; u! V# ?9 u* W' l, R
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    + k% _4 a% P8 Y+ r; Z  M" n  V2 x
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ! i; ]5 p7 Y. q/ n: ~, t. _/ a
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    + v  m$ {2 ~  r. ~* L
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    1 N' i5 }7 Q+ ]$ j6 ]+ b
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';! u% l% R+ W5 X+ `
  20. ) q/ v) ?9 N/ g2 B' E1 `0 \: q# z
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    8 ~+ @5 ]) L" N$ U8 @: p- u7 [
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    8 [) P. v/ K% f5 t: C* M- O
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
      l" w' P# V# r, r/ T! i
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    1 F: }. f& u. ]

  25. " p; t0 z. u5 O6 b1 z
  26. type
    3 w' v6 F- j. }  j
  27.   EDataFlow = TOleEnum;
    8 ?; G( F: Y2 L% h) \4 S
  28. - k; B7 r' U. ?. {/ P6 S; u5 p+ m
  29. const- x) F5 B" U2 z9 h# [' h
  30.   eRender                               = $00000000;
    : A* Y) {+ R0 T- u
  31.   eCapture                              = $00000001;2 S! Y- ^0 L. f) f+ d
  32.   eAll                                  = $00000002;
    . ~6 Y2 O1 j( X# R- }" r
  33.   EDataFlow_enum_count                  = $00000003;% c0 q) |3 o+ y& q% j
  34. ' k- v; o% m' P, v0 f$ O2 Z
  35. type
    ; P* y; z# X- h1 {+ u
  36.   ERole = TOleEnum;
    # H& x: p- q$ K+ W0 S- W' ~, z

  37. , n" ?( `$ e' @3 q# u
  38. const1 S* f- k2 F- j' N: T
  39.   eConsole                              = $00000000;9 t9 s3 ~$ R+ x
  40.   eMultimedia                           = $00000001;' T; {2 {6 Z+ E( F) ~# B2 p! Q  x" y
  41.   eCommunications                       = $00000002;
    ! n+ k8 D6 F  o5 {: }
  42.   ERole_enum_count                      = $00000003;! Q4 q% T4 S  I9 ~2 o) \

  43. ! t9 ?6 k5 v# Y8 ]! a- v4 I
  44. type
    6 h% A7 @/ p5 K1 x% @: r4 m; h
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    6 c5 b5 H: _; a  A/ z+ T! E2 n/ t
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    2 I$ O( [/ Y. S+ R! h0 }- p" V- m, C
  47.   end;
    ) t+ w, {) Z3 N" k1 E  b% N
  48. ; G0 b& t) _) R8 H+ ^2 a
  49.   IAudioEndpointVolume = interface(IUnknown)+ b( S7 Y% K. H7 U; G% R
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']" F1 B3 W  d0 c! d0 r( t/ ~- x( t
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;2 l, E1 ^' t% _, Z) Z
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    - O9 f! T+ M& [2 Q% f$ H
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    / l4 t1 [( B( ?
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    * P8 f' X0 ~. L, r
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;9 ?* F6 P( P( ?8 }- t
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;0 C8 S3 H  R5 h
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;/ W" f  S! U- S. G
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    7 I6 l5 I$ P% [* |. M6 ]8 }7 w/ r
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;2 l% U7 _- B6 r# [
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    0 w4 ~* B& t# i) r0 z! |
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    7 x$ ^2 }* F, b$ ^: r# Z6 x
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;2 x. j* J( |  R2 [
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    ( R# ~( M% S& |8 m2 ]5 E9 `0 M
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    3 J6 R% [3 P4 C( t3 s- Z8 i
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;3 [9 Z  N! c6 ?. _
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    ; A6 s$ ]) ]: }- g3 c
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    9 _+ n% V, I* z
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    ) ]& l/ `& o! Z5 W( n
  69.   end;
    - C7 h% [( Z, k6 g* w+ b
  70. ' \6 M* ]: i' Y8 R2 n# U" ~: {" O
  71.   IAudioMeterInformation = interface(IUnknown)* \7 H9 N2 P; G* T- e, z
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    - z+ i' |8 W2 ~% C' m- f0 _
  73.   end;. T! }  Z( c$ q  Q5 {) k# t

  74. , H% U# s# U- B" X
  75.   IPropertyStore = interface(IUnknown)8 u4 b$ y  m) `; c
  76.   end;
    9 K; {) }; w' [# F% Q1 U1 m
  77. 5 z  Z% I* l# X$ r2 S
  78.   IMMDevice = interface(IUnknown)9 H7 f' Q& I4 w) H" D! f
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']; p2 ]3 P) P$ }0 s9 o
  80.     function Activate(const refId: TGUID;
    ) ~1 [. L; K; @- ]
  81.                       dwClsCtx: DWORD;& h' w$ L- |  l( ]  d& z+ i( L4 y7 }/ l
  82.                       pActivationParams: PInteger;# |& ?9 N2 |3 g1 W" o
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    , g1 K+ S! u3 k/ i
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    1 G% {1 U" j. n6 u
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    9 ~3 p: Q$ O# b8 c" F
  86.     function GetState(out State: Integer): Hresult; stdcall;
    ) Z2 _1 M, j1 r
  87.   end;
    / l+ h( d# D# C/ E/ v

  88. - G: o  H. i/ e& _

  89. 0 r" h0 e2 z! o5 R3 e2 D( ~
  90.   IMMDeviceCollection = interface(IUnknown)
    ! U* _2 e/ N( u
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']9 |8 O$ a7 h% }: x! _' b5 H
  92.   end;
    & C. H6 b% w  D' b% N7 e" L' i
  93. 3 I8 A8 Q9 j) V1 V$ Z/ X& E+ }6 x
  94.   IMMNotificationClient = interface(IUnknown)" ?1 Z) |& d. M
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']& M$ m! k8 F2 `% t$ H* r
  96.   end;
    % U- r: L! e+ ]0 c5 s. x
  97. - `' `: R6 W5 _
  98.   IMMDeviceEnumerator = interface(IUnknown)# m1 T4 l/ |1 o1 N
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    # a1 E* b, @& D. e& i8 {
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    ) `" m2 Z- \, [. [
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    & {/ A4 A4 K  N, v' z
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;# \2 |1 M9 j  b4 E' k1 ^
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;2 j' F  W' W) z" l* F1 G9 D9 w
  104.   end;: }+ W7 k7 K! x: W
  105. , H8 Z, B/ \4 ^$ P
  106. implementation
    7 k6 d# N# c' p
  107. + L* F0 @( K" }" y
  108. end.% X4 B4 J5 Q: p" |# t
  109. ) @/ ^+ i6 ?9 \% t; I1 m
  110. ///////////////////////7 O' P7 j$ L. |/ C& s9 G
  111. simple sample :)
    & G' q1 Z% p: [- R4 j6 }7 l
  112. ///////////////////////) P3 G. O, M- u1 m1 S1 H* g

  113. % @9 W/ i1 e) C7 x/ m  Z& q0 {
  114. //...... other code
    - _* h( Z* C0 C3 `% I2 m- z

  115.   W4 @  C& v& C" q! s* e, Y( I$ ^$ ]7 W
  116. uses ... ActiveX, MMDevApi, ...;
    ! r9 D5 l9 R8 q& r

  117. 4 z0 G  G' `( k9 l1 v! X
  118. //...... other code5 O2 |& T/ L2 ^

  119. ) B$ {, x. b" G1 d
  120. var# H' j6 P( P- L5 o: J
  121.   endpointVolume: IAudioEndpointVolume = nil;( V. V7 x. j1 E" I; L  ^. W
  122. # |& f, G! A* s  f6 k
  123. procedure TForm1.FormCreate(Sender: TObject);
    : @* S; ?) o' w- P/ ^0 v
  124. var4 R. r) g! g/ y. K. e5 Q
  125.   deviceEnumerator: IMMDeviceEnumerator;
    # h9 h3 [4 t' b1 j* U# Z
  126.   defaultDevice: IMMDevice;
    3 Z* I+ X) O* ~# I1 u3 S7 |% S
  127. begin, E' R4 p$ P, r: C1 ]# ]) \  Y
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);/ x; w, e6 M8 }/ r5 m1 _7 ]
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);: m1 z) v- z# ]+ Y5 `* y
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);- ^+ o" ?% M% Q" z! I
  131. end;* d+ S% a  j& {! t  d4 T

  132. 8 O/ t  }4 F& V" B, A
  133. procedure TForm1.Button1Click(Sender: TObject);& J5 O! W% s0 t, s1 ^
  134. var; ], B3 U( P" s* `5 @8 e
  135.   VolumeLevel: Single;
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  136. begin
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  137.   if endpointVolume = nil then Exit;6 U4 ^6 a, X5 G$ S
  138.   VolumeLevel := 0.50;& i6 _) e% v3 ^2 E0 e* }5 D
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
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  142. 1 e; V- p, A$ {4 E' W6 c) K# v
  143. /////////////////////////////////////  h' P+ M1 E$ T7 l* E
  144. / R, w' X8 I6 [# m. R5 r
  145. // with best regards ToxicDream2 Q/ T  U' u: k' P) i4 L
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