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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
: b) @1 V* |( O" `  u% WBy Mukta & ToxicDream
  1. 1 _/ i- A  B# g( _5 \
  2. //for delphi 5" S* {5 V# x, w( e. r$ j; b; R7 [
  3. unit MMDevApi_tlb;  D: Q3 @9 J8 }. A- N; n

  4. ) t# D1 x5 T2 L# l; ]
  5. interface
      q: n+ K: ]) o; _7 Z9 A4 }
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    0 P/ ~! e9 \1 g( ]% c
  7. const
    # {! L7 U7 x0 H4 i
  8.   // TypeLibrary Major and minor versions- G* F7 F# T- g& L6 m' [& U
  9. 3 v/ \1 v6 x; s( T! k6 G9 \
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';6 @, n0 C& R+ K3 x
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';% O& |$ @  q1 y
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';5 x- _7 ]; f  y7 }. L) Y/ l. Y
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    4 c% p7 M) K* b8 k- M/ b: u1 q
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    5 k: f7 j% S7 [
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';* i5 }+ k0 |4 w0 x' I, H/ w/ U
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';7 Z6 U) a# _& d( c, D. Y( B

  17. 6 T/ A  s( {% r
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    & p5 f7 k$ @( g: E- x1 j: L
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    4 ~. Q% F& D5 ]6 ~
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    , Q# c# u- [2 s, b' u4 d- r
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    ) A& D- I7 L. W  x" U. _2 y! g2 L# d

  22. 8 x- Z! _2 U( l: o& a+ T1 |$ k
  23. type' c# K% g) `: V" s9 j
  24.   EDataFlow = TOleEnum;
    9 ^0 V* l) Y( I
  25. const
    6 m, V' Q9 N! [# O! [! r
  26.   eRender                               = $00000000;
    5 a$ @( A0 B* |( r3 a
  27.   eCapture                              = $00000001;, J  H5 C7 p" G: y. ^
  28.   eAll                                  = $00000002;8 T, p6 x5 g6 r- E0 D4 m9 H& F
  29.   EDataFlow_enum_count                  = $00000003;
    . ~( k! ~2 o: ~, `6 {# S4 _
  30. * U- o9 U' b; c& [
  31. type
    4 h3 ]" L2 @+ |0 \
  32.   ERole = TOleEnum;
    , l" y0 I8 F5 {& z
  33. const
    % Q2 ]$ [4 ]4 `
  34.   eConsole                              = $00000000;
    0 c6 ~$ G/ i# E( I1 ]9 y- }
  35.   eMultimedia                           = $00000001;
    3 S; _3 c+ ~% T  E% E
  36.   eCommunications                       = $00000002;/ m% q9 N  G5 R/ T8 n8 E; J  {
  37.   ERole_enum_count                      = $00000003;' P) }1 b* I( k( Z
  38. 8 `' ^! M* T9 Y6 b: Q
  39. type
    9 j7 ?) d+ c! K1 V* Y: A+ D
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)0 S' w5 v) q3 Q7 z7 N  }
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']( o) S- n! Q. z) b$ H
  42.   end;
    " n  n6 ?: n" ^) S- ~
  43. - D4 A# h5 R" \1 r; ?* M
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    + x/ R# o1 l  q  I0 E, F
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
      k4 i6 W% _# I1 [
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;0 P/ H8 i5 ]5 r! @5 d$ |
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;# h5 h  l, |2 U
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    $ S7 O' X& E. T5 U6 X
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;3 |  V/ M! g# Z
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;  p/ H7 v1 C5 v: Y- A/ y+ f  b
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;" m/ u9 s+ x5 A$ t$ p. q: P
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;' z, i- j: Q3 [
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    / x2 t; g( Y( Z. m# \; F) W
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;5 p' U; S. X$ U% S* e8 `6 g7 z
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    ! J( I! |. r' \2 a4 e* H
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    8 i$ ^. @3 X7 ~" r9 D
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;. w( c: k7 D6 F
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;: w) x: y0 \7 V' G
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    1 |) z( u$ X2 h( t
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    $ I' z1 u. ~% v" v% w
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;9 ^! H4 K+ g8 P: d8 g
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;  z" G4 W% a- \3 B) O  N4 O
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;- h/ K" }+ Q& A0 c* k' l! C( C
  64.   end;
    " R0 g6 {$ N& B! `6 _! L* a5 Z

  65. & K' N  q1 r& }
  66. {  IAudioMeterInformation = interface(IUnknown)
    * X# g1 F, f$ k+ D$ V  l
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    3 C/ i+ O; E9 r2 {, s0 F
  68.   end;}
    9 k# J% N$ m* s4 J
  69. & ^# R: ]0 }5 r- R, X2 z  s
  70.   IPropertyStore = interface(IUnknown)
    3 ]! h2 |6 T; t( G' @9 }0 P6 Z7 \
  71.   end;
    " B* o  U2 G6 b

  72. " q" X) l/ Q9 v5 U1 K. k' j# F% p
  73. type' K4 f1 g% i0 _7 |0 m7 g# s2 a
  74.   IMMDevice = interface(IUnknown)2 X# E( F9 {/ Y* r  t3 V* o
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    % W6 z- d& w  Z  {5 ~! t  \
  76.     Function Activate(  refId :TGUID;- M" u7 v$ o& R3 I! r: L" m% ^
  77.                         dwClsCtx: DWORD;3 X: _; C! {* `& Y8 a# q. B4 V; R
  78.                         pActivationParams: PInteger ;
    + A9 u) x# g$ m" i  v" X
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
      b# f. j, D' e2 |* z3 \
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    ) R+ Z& k( B3 b7 M) [
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    9 `8 k5 d- R4 G/ E- p5 a1 {5 R
  82.     Function GetState(out State :Integer): Hresult; stdcall;( s8 b8 M; @6 S" v+ w

  83. 4 I; l" z3 Z; U1 d( }; x" N
  84.   end;. m3 ^& K: F; o4 c. G9 Z

  85. ' `3 H* Y0 ]4 q: |  T8 g: _/ t

  86. 1 m" l7 O! T3 g6 H* m
  87.   IMMDeviceCollection = interface(IUnknown)
    ) Z0 U  V% |( g, p; e
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ; W2 g) `* Y- R3 ^$ e: b9 o
  89.   end;
    , L! v+ ]0 O0 @/ F, j

  90. 8 p# S4 i2 k8 A1 v) O8 q8 L5 }3 K
  91.   IMMNotificationClient = interface (IUnknown)1 Z, h7 |0 L% |2 D; v
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']0 w# H! ]$ V" f( \4 [" i
  93.   end;: c; E' v- I5 H1 C: L. w
  94. 4 ?$ N6 V# P! ]: M* M
  95.   IMMDeviceEnumerator = interface(IUnknown). H' s# e4 G5 H; C3 v. v
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']$ `2 P, @% w% _. w) N
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    6 R5 A+ a8 U: p9 F8 E* D' h$ N! G- h; Z
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;( _" c2 E! Q0 j; L7 L, W( m
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;" g5 b  T1 L4 r0 T* e5 \# O
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    9 i. R8 x4 i/ W1 [9 W! e6 Q$ i
  101.   end;1 I/ I( X0 E" r( W* j
  102. 8 t1 P/ U- [/ S1 r7 c
  103.   implementation/ l# ]5 x9 [7 D& y) P9 Y. @3 v7 V
  104. end.
    3 q. w. K" g2 e9 l/ R( D
  105. 3 M- u0 {1 u3 s# D/ E
  106. Thanks & Reagrds,
    / @* \! u8 a$ [' e% B" L: k! [
  107. Mukta .... V* s9 N4 R/ Q5 C: ?& @( ~
复制代码
  1. , C9 j* V# I4 }
  2. it's work in Delphi 7
    1 j0 B2 c  b2 p8 e: y% ~+ H' [
  3. //////////////////////////3 R. Y5 j1 o( S5 d8 }/ b

  4. ( D- `3 f" K$ f) ]: G
  5. unit MMDevApi;; C/ y( B& f7 h6 q) P
  6. : ]8 @9 o2 q2 H2 L+ {" h
  7. interface2 c9 x1 J0 o' n* ?* `

  8. 4 b  {7 `' A0 O/ R0 g% l; `
  9. uses
    2 J7 T6 R8 Y& ~, B. p
  10.   Windows, ActiveX, ComObj;4 L$ C" N, G% Z5 ~
  11. 6 u. f! a/ a, o7 H
  12. const
    6 m. h* i& D3 i4 A8 f7 _6 K- W
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    + M1 x& R8 a' T. X! [
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    5 \1 q; H- i7 Q: N' k- j/ m
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    + _  a" ?/ b6 `# k5 q7 C! Z
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';7 F: U/ [3 W& U
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    : ~5 j/ Y( O0 x
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    1 }  X1 |* Z& w; T! ]
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';) `+ {9 W8 N# v+ \! j
  20. & n! C) P6 I+ k+ n4 |
  21.   DEVICE_STATE_ACTIVE                   = $00000001;0 F$ H! U) Y# z
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;+ E+ c- H& a0 [, e3 i1 Y% f
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;7 |* B, J4 P$ E' ]
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    ; u6 b; N* ]4 w

  25. 9 A8 k/ K; J" K% [- s- ~3 @
  26. type& d: H6 Q- G& s2 j
  27.   EDataFlow = TOleEnum;
    % l* x$ m7 R8 y- `, e
  28. ' ]  |0 B" }, ^; M  ]
  29. const
    9 p$ `4 @' f# t' O- z) t8 X+ }: x
  30.   eRender                               = $00000000;3 H! N: y+ x) v& I. Y, `
  31.   eCapture                              = $00000001;
    , j/ I2 i. D' f, o2 T5 R
  32.   eAll                                  = $00000002;: n0 [4 I% ~8 Y( ~
  33.   EDataFlow_enum_count                  = $00000003;+ g0 S' E) S, T( g/ F+ ~, ]

  34. 8 |/ r7 J6 u6 I; C' C
  35. type
    / m# a, j  U& M* P6 p( w
  36.   ERole = TOleEnum;& D- m- \; f3 O5 k7 H5 t" r
  37. ; F, T9 g* W8 u6 n4 e, u
  38. const
    $ Z# e8 ]: m$ F5 V* Q% G
  39.   eConsole                              = $00000000;
    ' H: K( ?; ?' k  T7 M2 l% O
  40.   eMultimedia                           = $00000001;: y$ ~  ^: L% E2 }3 S, y" [
  41.   eCommunications                       = $00000002;" y0 @, B- K6 r- {9 L
  42.   ERole_enum_count                      = $00000003;
    3 O5 [- s% A& @0 S/ u

  43. & x% g  g2 I& q0 {) |0 o" |+ p8 [% I
  44. type- T! g5 F- U5 F' w
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)5 N3 t9 t4 X2 W% c" T
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    4 m9 q2 d. H2 z& `
  47.   end;4 z" o- U" h: K9 w

  48. 2 g$ c3 B& }3 q1 r
  49.   IAudioEndpointVolume = interface(IUnknown)
    1 d: k3 l) {+ h
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']5 u5 X* |. F+ I3 k* Y9 t( \
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    % n8 f3 r6 g3 w& T8 c/ B' i
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    , Q  w0 ?+ ~7 b: ~$ E
  53.     function GetChannelCount(out PInteger): Integer; stdcall;4 j4 v; M! o7 t$ ~
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    8 n) @) ?2 V. C9 `  R1 g' R+ ?9 S
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;$ b' k% a( [! {# a$ Q3 |
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;- ?6 b7 E1 J5 X$ F% V  R: Y3 b
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    7 a1 o/ c& h: m, v* m  y. P( s
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;! @& M* }0 H5 g7 N
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;1 V3 X& O7 |8 Q! X& Z
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    - F( _5 m/ d' K# s6 U$ |  D0 [
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
      x7 O+ r7 G; l/ H
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;5 \$ |- b' H5 G. F7 j5 Q) r
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;( X4 Y% F% |3 X
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;# @3 z+ l1 Q. C/ u% g
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    6 C; I. R8 h& k  E4 s! \
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    + \, P6 Y8 a$ x$ |/ ^
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;: I5 z9 Y- Y1 G" W/ ~0 T9 c. Q
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;5 |# m6 g& w: M, y1 l
  69.   end;7 o" f1 l1 Z( G
  70. , i  e; ]( {* P  R! g# `5 Z
  71.   IAudioMeterInformation = interface(IUnknown)
    * a5 r; ~, z& [
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']. K$ a$ N) O2 x* s* A$ _; s; w
  73.   end;7 U/ d- l+ z$ X' t( f( T
  74. 7 M. z+ Z$ u' V; ]2 O8 T3 e, u
  75.   IPropertyStore = interface(IUnknown)
    - L$ T3 b, s1 x  u+ y/ w
  76.   end;
      k: @! t! x* l8 R& Y
  77. & }5 r4 L: Y/ I9 u  E( O
  78.   IMMDevice = interface(IUnknown), H" \2 |, W& }. h, Z% _
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']6 `  S, ?" u' j( S9 y4 `
  80.     function Activate(const refId: TGUID;' P& C# B. B. p1 ?4 R
  81.                       dwClsCtx: DWORD;/ v: s: H; x" k: e
  82.                       pActivationParams: PInteger;
    - [& ~- t' g; p/ g# J
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;$ @/ y: p% N7 S* m4 K4 L; R
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    1 E& `9 q/ {, j! f
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    1 B% U4 b% U/ j
  86.     function GetState(out State: Integer): Hresult; stdcall;- C5 a: _5 w2 z3 T5 N% M, |; u! m
  87.   end;* U7 W1 k- i9 N5 `5 J% i6 K3 s/ j
  88. ' h4 r7 ^7 H3 @
  89. + n' \7 u5 v, M, x9 S
  90.   IMMDeviceCollection = interface(IUnknown)' B8 l; X4 b  k2 r# P2 ~* w
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    : X) v0 n- A( _. g% ~% ~
  92.   end;4 Q! [7 }& x9 _. ~
  93. 1 I4 I4 S5 z5 h# }% p2 q. q
  94.   IMMNotificationClient = interface(IUnknown)
    / I3 Q7 D# z( z" I* }2 w0 r3 s! q! X1 ~" R
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    4 P& b: E4 o  \( s* F- G# `. g
  96.   end;: s7 T6 h/ D' H
  97. * k: h! {" D% E; j0 {3 C( Y
  98.   IMMDeviceEnumerator = interface(IUnknown)! z7 ?3 s9 i; J, q5 [2 I
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']9 ?; d% }, m+ U8 P0 r5 |& D
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;* ?1 l' J$ o/ x8 d9 A
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;1 j$ k! K- l+ b# j% [: R. J
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    - Q0 N1 w( Y3 r# b* f$ R
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    5 D% y9 a, Y% n' T  f" j
  104.   end;* q) n9 l: C& C: Y
  105. # j6 ]1 |5 r! Y( A7 [2 M" T; ^
  106. implementation
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  107. 1 A* E3 ^/ p3 G1 x, H* i  z! s
  108. end.( e8 N# g' O0 v  l/ S3 h2 ~$ `9 M

  109. & Y* g: U$ Q3 L( q- G9 D
  110. ///////////////////////6 L9 t! m* b! n+ j' H4 K' F: y  l
  111. simple sample :)# y) L. S+ t( ?! {. F
  112. ///////////////////////
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  113. ! [  e! r! T0 ~: w
  114. //...... other code
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  115.   W) `. P6 t! q
  116. uses ... ActiveX, MMDevApi, ...;4 R) o' t& d+ O. [

  117. ( |2 g+ q! o3 j# B5 j* D
  118. //...... other code
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  119. / o9 d/ p3 t2 W  W6 {5 I5 U" u  ?
  120. var" Q; O5 V) N% s4 A6 ~0 i5 X
  121.   endpointVolume: IAudioEndpointVolume = nil;! n( v" n+ B- u- s* z  B0 l: E
  122. . l( B; A$ W5 E2 b& F: Z
  123. procedure TForm1.FormCreate(Sender: TObject);; l. m! m5 n5 ]4 S
  124. var
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  125.   deviceEnumerator: IMMDeviceEnumerator;; M: p) F; }7 h6 x0 }
  126.   defaultDevice: IMMDevice;
      C& T) H+ H; _1 ^1 T* ^3 M, M  E
  127. begin
    9 `) }. |7 F/ `1 Q/ u
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);1 T; v4 j0 v! Q, U
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
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  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
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  131. end;; K. Y# Y8 B; P: q/ N

  132. " V; E* P" O( p" H
  133. procedure TForm1.Button1Click(Sender: TObject);2 ]+ K  d+ T, p) N& h2 U
  134. var
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  135.   VolumeLevel: Single;( |0 ~* [; u- k) q3 w) _
  136. begin$ N2 v3 M8 T9 b: \
  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;
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  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
    ' s; p2 {/ @& @9 Q, V- ~0 A

  142. / e- I  a6 F: C6 N- J3 \+ E* {% b
  143. /////////////////////////////////////
    ) v, u8 O" u; u' M

  144. $ C; N$ C& g7 S$ n
  145. // with best regards ToxicDream5 x# m' p' d$ \5 ]5 T
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