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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-a8c9-2e27eb9ec0584 m0 o- n: n1 o% C$ ^5 `
By Mukta & ToxicDream
  1. % V& X  `) d" P9 A; X3 x
  2. //for delphi 54 e, B. w: ]" R' q  _
  3. unit MMDevApi_tlb;$ d! H6 c, |% g( m2 V" w
  4. 8 J$ p4 @/ r# O2 Z- J8 U' h0 }9 E
  5. interface; X; F2 e$ S0 `0 E, Z
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    $ E+ M8 s' m5 j6 ^% l, Q
  7. const
    + w" R! \) o$ L% ]3 {
  8.   // TypeLibrary Major and minor versions
    ' g$ m1 d# z" ]. d/ x6 n
  9.   p6 r8 g, K+ k% g. h- {
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';. i  n) v0 |' }0 S8 J& ?/ T' f
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';$ `; I: J( k4 K3 @% f- t2 ?
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    : _4 G* C3 n6 K+ `8 \" L) o9 P
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';% V+ R  ]$ s, K# X; s5 H' S: O
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';  T5 p8 O$ X/ h% p( @1 H, k
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';2 w4 n6 _4 R: `7 J  Y  r) `7 V2 P$ b
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';3 w( t) H2 o# D

  17. 9 f4 \( m/ X% K; S: S: O
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    . T, M0 P; A2 U, K4 q
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    5 z7 C4 B. }6 V! q3 g5 T
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;- e0 w( {1 ~0 w3 Z
  21.   DEVICE_STATEMASK_ALL                  = $00000007;4 J4 c% @' R6 P
  22. 6 M9 l- [7 J; I0 d+ Y: Y. o) ]
  23. type8 A9 a1 d/ W& z) k- {: f) l% p6 w( {
  24.   EDataFlow = TOleEnum;
    % d, {# F4 E; I7 S; t% o  F
  25. const# n+ Y  o/ i0 B. a
  26.   eRender                               = $00000000;# w* P. Y, O9 \. v# J- i
  27.   eCapture                              = $00000001;% y( e! Y8 Q4 K# p
  28.   eAll                                  = $00000002;
      J, R: n/ s& D
  29.   EDataFlow_enum_count                  = $00000003;
    ! {  U( z8 j5 M# C

  30. 0 [7 F! c- i. U+ C0 ~1 O
  31. type
    - t4 r% U& y' A) e' B
  32.   ERole = TOleEnum;& ?. O- P- a; Z! Y9 K3 z7 D
  33. const0 Z% n4 e5 b9 ~0 T- }% F
  34.   eConsole                              = $00000000;
    0 J! D; W2 k( G1 A% y& O0 e" o7 E
  35.   eMultimedia                           = $00000001;
    , w2 e$ v& x" _) U
  36.   eCommunications                       = $00000002;
    7 E- A( ]7 v2 r0 c4 E4 S6 ]2 }
  37.   ERole_enum_count                      = $00000003;' z! G+ f/ C/ K/ k1 E

  38. # n0 T1 X, Y1 m4 Z0 r$ ?& X# v
  39. type9 O# W4 t% l, M9 O3 l2 T$ w$ _
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    1 u6 q: I# _  y9 B
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']1 M, o# m: ~: `  }
  42.   end;1 H7 _- _  V* f! m6 e

  43. " H! G+ M  v9 v; _7 T
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    ; u& V" O- [. s( ~0 m
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    + |3 l, H) B  F* O- B
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    0 }9 B' Y( g) `6 \$ W2 u& D
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;8 h8 X/ S4 M3 c4 R
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;. ~; l9 E' O, U/ W5 q: Q; p
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    1 i- h0 p  b3 K* p3 ?
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    & V. d+ |0 e( {5 E% [/ v& g
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    # N6 K8 U9 W% m4 }+ ^
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    5 f% H/ \4 e  {( O1 }
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;  P+ [5 R+ x$ ?# H6 i
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    # k5 A7 W" t9 e2 c2 E! J3 v0 ]
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;+ t2 C2 Q6 W0 C8 ?3 z) A
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;  \, y' z# p( e8 N7 P. a3 c
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;4 S6 s: k: v0 S' k2 W' a( |
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;! }+ @# e  R$ u8 t7 g; M- |) U
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;0 K' ~' \) E! Y! {+ k' s
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;; y/ O8 x3 Q, D8 [
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    0 s' C* h; _. [
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;- d% F0 k% k- h6 [% q
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;% r5 t6 |5 {/ P. ^/ X3 E
  64.   end;: z" N# e/ G3 ?5 J2 \. B7 B
  65. 9 t3 G! ~+ |# X
  66. {  IAudioMeterInformation = interface(IUnknown)
    ; L0 C- t; q3 k. z4 r" a
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']3 N2 R9 n$ @+ F1 a$ j! \
  68.   end;}
    , k# ?8 k, P* l6 x8 t+ c8 N  h
  69. 7 L: k0 z$ i- j' A/ C) X  d+ o
  70.   IPropertyStore = interface(IUnknown)
    ! L' B- K$ x4 b
  71.   end;& c2 n2 z3 M' n" ]  s

  72. ( @1 }" B+ s+ `! [
  73. type
    & T+ i9 U3 F9 y* V
  74.   IMMDevice = interface(IUnknown)) W5 Y" T; n$ u+ x2 Z) f& w
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    ! \1 X8 g2 t% o1 V, ]
  76.     Function Activate(  refId :TGUID;
    # g1 {2 N2 R. _$ f. ?4 P, d' E3 \
  77.                         dwClsCtx: DWORD;
    # R' y' X1 |- c* }, d+ l
  78.                         pActivationParams: PInteger ;
    5 u1 D& s, N8 U+ E3 `6 i  T
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    + R! j, r1 n$ ?: o! k# P* W8 c3 ~
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;1 p# M0 ?0 O; u/ A! W0 O  W
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    " q# a. M- ~* r6 R6 p; k) }0 m
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    % o+ ~3 Q: R% {/ Z* }: j- D6 |, _
  83. $ ?8 y  s* n- T9 U6 `6 D) L) Q0 ^
  84.   end;* y2 a& R9 L$ ?7 w

  85. * `+ C: f6 w/ Q# D" X0 \4 v
  86. 3 G, n! {' s  Q; Y7 f8 v
  87.   IMMDeviceCollection = interface(IUnknown)
    # C  e( `  c. v6 ?: j% Q
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    - ]1 ]2 B, O% f
  89.   end;' e) q' h! `& p2 {0 Y( ~

  90. % O& o) t; [9 q5 e. I( b& J
  91.   IMMNotificationClient = interface (IUnknown), d. @+ c: p$ \" h6 I
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']; }$ N# w! X& z8 A$ G3 h6 Y
  93.   end;" C3 Y9 L! u" r. K6 F
  94. & L/ d. i- w# N" @1 {5 ^, Z
  95.   IMMDeviceEnumerator = interface(IUnknown)1 F& u% G4 P- L8 P3 W7 i
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    . w0 F  M) ?9 C* g) Y& K
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    & s1 F4 {9 F, Y1 W0 O" r
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    3 H4 c  e1 z  s: N0 p
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;+ T6 C! z8 x0 ~/ O1 f
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;/ B3 c3 J! k6 X9 r" B. Y9 u. L
  101.   end;- q$ \& o, ]" x/ |

  102. 4 K2 i. X2 i# b/ T
  103.   implementation
    / f  `0 C2 A6 }  q
  104. end.
    0 U1 F! u: N; |' M/ k
  105. 3 b( G3 n7 k! f, f' Y
  106. Thanks & Reagrds,
    & u; V2 i1 c. _0 H; w+ X5 Z3 E
  107. Mukta ...* d: d& F5 Y9 l+ J, Q4 E
复制代码

  1. ; F* M4 s% I: C/ n2 x4 t
  2. it's work in Delphi 74 Y; y4 O- _7 `) X* M
  3. //////////////////////////) C3 @3 ^' I, Q, l% E

  4. $ q# M# ^" L6 v
  5. unit MMDevApi;. ]& C4 U3 ?& T; c! j4 e- b1 O
  6. " B, c3 p8 h( A- a
  7. interface+ A" T% F4 |* m  ^
  8. ( A  |& _5 r  F& G
  9. uses% {4 A$ G/ ~7 b; Y; D! R
  10.   Windows, ActiveX, ComObj;' T& @  P7 f1 q( E1 n- f

  11. 3 I; A: T+ ?4 N: Y' S2 |
  12. const
    * [3 ]& |7 E9 i
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';- `. Y+ Z: v3 B4 ]
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    - \: u6 Y$ ^# k* l/ h; e* _* {
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';, n1 W6 t4 P7 H  n( f
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';( Z7 {7 ^4 w2 `- x. U5 W$ m
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    1 K8 o# W/ k. [- c! \( Y
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';' V9 ~) }) i; b) {3 h; n
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';. }' i4 B1 M7 p) J2 m
  20. 3 R  t$ [6 r" x8 K9 p; j9 Y* b$ o
  21.   DEVICE_STATE_ACTIVE                   = $00000001;9 _  m& I- a6 S2 Q  g2 Y3 q) a- T+ D+ y/ p
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;" y. P# b# L0 t% S0 f* l
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;( \5 C9 I$ m0 E# g/ N7 u9 W
  24.   DEVICE_STATEMASK_ALL                  = $00000007;: F' G( p7 o, Q, z9 }6 X

  25. % i& D% o& a2 S
  26. type  [% F, g: G" b% G' u
  27.   EDataFlow = TOleEnum;  Q/ o! ]( N* G2 C: H

  28. 0 b( Z' ?( y+ `$ V3 ~- y6 K
  29. const
    ; @" k5 x/ y& ^
  30.   eRender                               = $00000000;
    ; v8 ~" c# b; _0 D
  31.   eCapture                              = $00000001;6 U' e3 {( `$ N+ o" _; i! a3 k
  32.   eAll                                  = $00000002;0 g2 ?/ K) x/ m1 o- p6 ?
  33.   EDataFlow_enum_count                  = $00000003;% F% }/ m9 W3 |! N2 k$ Q
  34.   O9 u! S5 A' _9 H8 o
  35. type+ A/ h7 ^. `4 \# x  m
  36.   ERole = TOleEnum;/ [9 a% Z: T1 f! P* x
  37. , @% p8 N7 Z4 o$ x( ~2 q4 W3 g
  38. const
    5 p- N  F; a' l- v" Q
  39.   eConsole                              = $00000000;
    1 ]8 J, E" [7 K/ W+ |
  40.   eMultimedia                           = $00000001;) }& u# `3 U# u$ q
  41.   eCommunications                       = $00000002;! L" n' s2 A# e
  42.   ERole_enum_count                      = $00000003;
    - o4 n7 y+ P3 ~  N/ l$ y+ N
  43. - g* z" V. _; B
  44. type
    9 K+ _. n2 q! v7 T5 P8 n9 o
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)' I+ ?# w  s" u/ ^, G% @. ~
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']( A& C& |6 R4 j4 i  y& q
  47.   end;
    * v. o! w! M. {, T3 H& |
  48. # b6 c" z4 f- n* N) @
  49.   IAudioEndpointVolume = interface(IUnknown)
    + h( V6 Z# z& o4 l8 P
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    8 H, H5 j* y- z. J' w, T: P' o
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    9 l; U# S1 q- \2 q
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;( x; e- `: P  x' G, b
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    : w+ s' Y0 z& h6 U0 d
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    7 L' c! u0 y) w* k, G0 ?
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    ( I; U0 J2 L: t  Y# U& X, f, N
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;( z* l6 c. C7 W8 w* G
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;; Z8 l* ?* n9 B& P$ k
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;* f! z% A( C  F: |4 F1 A: r
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    2 Y9 O7 S( Y8 q9 \4 Z
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;  |" B, U+ G, V
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    8 u6 @1 ]) j! Q1 W0 I1 a+ U
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    6 z6 g+ z0 `9 \. g% j7 K# E
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;% Z' E' N) V0 N/ ]) U6 m# n; L
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;* A, i) V( o# A3 H/ t- e
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    ) x/ _& x1 J4 m, \# {* X& _1 H
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;. g! O: b* W& V3 W
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    4 y/ g- w" _$ C$ v
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;) _8 p/ x  R/ G9 B
  69.   end;8 N2 v8 j5 x+ K6 [0 C  i
  70. 4 T; ?( A. @0 r4 ?1 v1 I
  71.   IAudioMeterInformation = interface(IUnknown)
    4 h8 v# W- j4 y
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    # s  w: r) ]3 d- E; l7 j
  73.   end;$ s& e! p) y& @/ P  A* ^
  74. 6 t: g/ \: |" @8 o+ X7 E% M" Z
  75.   IPropertyStore = interface(IUnknown)
    : Q& i1 H8 n: M' B3 U, R
  76.   end;
    , V* j. B7 N8 L- y* A) @' c
  77. 5 v4 k8 {2 G- b. J. X; B6 T$ v* `
  78.   IMMDevice = interface(IUnknown)
    8 W0 F) Y& Z0 P. `, B+ \7 W  s; Z; u9 s
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']- u2 f: Z& s0 o! V$ ~  o
  80.     function Activate(const refId: TGUID;- d/ `; n3 t5 j3 I" b5 M
  81.                       dwClsCtx: DWORD;
    # o0 c' m8 c* {6 ~. f+ t
  82.                       pActivationParams: PInteger;
    / y- g: q) y( ], q8 w
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    * w. A, \1 P6 \& g6 f
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;2 {$ q! P$ y5 p* f8 g
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    2 f; E5 m: ?3 n% P. E" C
  86.     function GetState(out State: Integer): Hresult; stdcall;! \1 v1 R5 G" S4 B3 a# Y4 g3 H
  87.   end;
    + p# Z7 a" b. i" r$ \5 {

  88. 5 k7 H+ e' a+ J8 u: {6 h$ B; `
  89. 4 u0 g: s7 N; p7 h
  90.   IMMDeviceCollection = interface(IUnknown)
    9 |; n: a) S, g8 h+ g
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    - j. ~9 P, K1 B1 j' g3 a6 W1 ]
  92.   end;  O! x- D$ A- P( x

  93. 2 d* J- ~4 A* A9 _. k
  94.   IMMNotificationClient = interface(IUnknown)$ {$ S' h! X9 o
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    * n. `* ^7 j5 g/ W  l  {3 {! I/ \
  96.   end;
    6 U2 U9 x# B$ ]1 p% _4 a4 e# a
  97. ) e5 L) C6 i& `! b. M0 \# z: \
  98.   IMMDeviceEnumerator = interface(IUnknown)" c8 J1 T- |3 n, t$ d- h& Y
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    # ]3 [8 D* h9 v1 f( h; K  A- T  |
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;" y) m8 }& m8 [" z. `- E' I
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    ; Z  z) n3 q# U* A9 j2 }
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;, Z2 `/ T) t% d# o3 j# }
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;; W$ S. g0 e- y' d5 R# q! ~
  104.   end;0 M$ x. n: P$ C+ }, p/ ^7 R

  105. ' a# e- W: ~! S
  106. implementation
    4 p) D% @; M% {# z, |! M
  107. 7 n" f1 M' P" a' V6 O3 q: v1 |
  108. end.
    2 ~9 E/ V' j# X: L& ~
  109. 3 V8 y  m: b$ m" X" F, ~; N- B
  110. ///////////////////////6 N. \  C; l2 r6 _8 b# Q: K
  111. simple sample :)' J. s% f) \0 K2 V) b9 W$ `: N
  112. ///////////////////////, h4 Y. p+ q2 y! T

  113. % t, s# y& ]7 t0 G. E
  114. //...... other code
    * T% f: o0 Z1 D& ~; f: X) K( o
  115. : U- G5 h; q5 @0 A' M
  116. uses ... ActiveX, MMDevApi, ...;& O& `. X  c: u) ~. k, M- C5 \5 {
  117. / d! C/ ]5 z8 E  v9 h
  118. //...... other code
    5 J0 U* U4 h8 n; j3 ^: o

  119. 0 S' ^$ }, E- @" q( _5 E0 a: a
  120. var# z. O9 u" ?: G4 n- T0 O( [1 F
  121.   endpointVolume: IAudioEndpointVolume = nil;
    : s& e8 `) i& s. U) J

  122. 4 d! k. u1 n' u; S
  123. procedure TForm1.FormCreate(Sender: TObject);; V& k* m7 t4 U3 Y1 l
  124. var
    $ o5 i& V) u& o$ |' F8 T
  125.   deviceEnumerator: IMMDeviceEnumerator;2 J# Q5 C1 G3 N8 V8 \
  126.   defaultDevice: IMMDevice;" @5 J1 c! f6 A1 `
  127. begin8 J6 }9 C% A' a5 T/ c6 e
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
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  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
    + T( V) I" b/ ?. T. {3 O4 T
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);: P% p. Q: F: J" A
  131. end;
    2 U% s; [. R8 \* ^, v

  132. 8 k8 c* w$ h0 `( W$ n( J
  133. procedure TForm1.Button1Click(Sender: TObject);: c& r$ a: |9 g1 D
  134. var
    / _/ t# o  ^/ V- `: I0 o
  135.   VolumeLevel: Single;' F5 B- w/ w7 U5 x6 K  m
  136. begin& Z6 A$ y& i/ `
  137.   if endpointVolume = nil then Exit;
    . V; |* c, V3 P
  138.   VolumeLevel := 0.50;; M* b9 Y3 O, \: v8 o
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    ) w% H4 ~- O3 h
  140.   Caption := Format('%1.8f', [VolumeLevel])
    + p8 C! i. r8 Z5 {' Y; v9 i: W
  141. end;
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  142. ' [9 `1 s. x% H
  143. /////////////////////////////////////2 b4 ]) _3 _4 x# X. b# M& p

  144. 8 p: p+ j8 F/ g$ g$ i
  145. // with best regards ToxicDream6 B- y5 w" b* |
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