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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
- A. L1 p1 C6 j( ~! j, ?# uBy Mukta & ToxicDream

  1. / M' j; s: m5 d9 ?% Q: m: |
  2. //for delphi 5( R4 y; |& q8 D
  3. unit MMDevApi_tlb;" e8 ]5 K5 N5 ^3 s& F) D
  4. / Q; I8 p$ W4 l# C; ?+ v3 |) k
  5. interface
    0 p: q# u; a$ ^0 C0 Y
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;6 |! K% x# d9 S: n
  7. const
    " }! L5 `6 n* T
  8.   // TypeLibrary Major and minor versions5 A# q' U- {+ B
  9.   t8 w7 ?0 e, P" L' E; x" D
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    : ~8 c! f2 ]. @$ y+ \
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';& f' K6 \! d3 p5 I- Z' [5 z3 e$ t
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    4 ?; [. ]9 M6 x
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';! B8 B; g; a& F/ M
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    0 H  ^2 O' k6 a$ K; S' v# N5 J
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';) G4 p; V& Y+ c: r1 t+ l
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';. N1 W# O1 S9 j, t, b# k
  17. ; z: E% j- k, F: l
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    $ x1 |, ?$ v4 Y/ w, C9 ^) d
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;; ]% s/ v9 }) _% M0 U& K
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    + K5 G8 t5 R* X; H. j& C+ A
  21.   DEVICE_STATEMASK_ALL                  = $00000007;3 ~8 h) S; K8 J, X7 X
  22. : ^' h: s4 ~4 @% y
  23. type2 [8 ]( i5 {: T/ Z* N, P- n
  24.   EDataFlow = TOleEnum;
    ; k) b) y) D2 J4 b
  25. const& _4 a4 u$ S1 m
  26.   eRender                               = $00000000;- R/ e3 S7 q* `3 l6 p. M
  27.   eCapture                              = $00000001;3 I) o* R+ [4 V0 r2 q. {) b* j
  28.   eAll                                  = $00000002;
    : N3 b( E! Y" l' K
  29.   EDataFlow_enum_count                  = $00000003;
    / z/ S4 D, Y  L5 P  |. C9 G

  30. * X! C+ K3 [+ R5 T8 s0 z, `
  31. type
    1 F9 V* K0 W) l) G1 s  F
  32.   ERole = TOleEnum;
      `, G3 Y( I% P% Q2 u
  33. const. U, T" b% Q% j( f6 f( c3 k
  34.   eConsole                              = $00000000;
    3 |4 P0 I" k  Z) v+ Z: B
  35.   eMultimedia                           = $00000001;5 {. n* W. z; Z. d2 t* F& v1 G
  36.   eCommunications                       = $00000002;
      G: k. R/ V8 y6 a* }
  37.   ERole_enum_count                      = $00000003;* q( N" v, o2 a  i
  38. 9 b- Z8 a  U- F5 R
  39. type
    1 b3 k8 J7 X# ~  K# p
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)& B1 c% g# }; _1 t! y5 O
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']! S9 S3 C# `3 U. o
  42.   end;9 w/ G- ^) F# q# v) m
  43. 6 b4 |! j, |; e. a
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    5 j! n) m8 _3 ]+ }% A$ H- z2 s( `
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']! |- c3 d) A0 d3 V/ g
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    . _% @3 i) y2 [
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;2 _2 f7 t, n; v1 ~* I- y! @# {
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    8 z8 D6 l3 [$ m) f8 c
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    8 }  y6 T6 f$ `' I0 t- ~; d
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    / |& C# `* C. D6 F
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    7 i- j  }4 d8 h; M; q
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    4 ^- K0 J4 M1 H9 N
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    , t" x6 k4 v5 ?
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;' D1 L6 _8 r; D$ z* N# n: A7 t! M  P3 G
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    * W- L* n( `+ K6 E6 D
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    / M! z4 h+ `2 E( C1 f) \
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    . W$ L$ s2 |+ L$ M5 G5 v) N1 T
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;( Z: ]+ m7 ?1 Q3 _( j- h& k
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;. u2 z) _+ T; x  U
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    5 p9 b* E* U# C6 \& P  r, t
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    $ C: t& Y& x8 Q' \- V$ G* l
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    ! e- r* ]. o' F" i% S3 ^6 U
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;: _( v, P+ |1 y2 ^; T
  64.   end;2 O6 t9 b/ q" `( l/ d

  65. & B6 p5 ]  q6 c  L; X
  66. {  IAudioMeterInformation = interface(IUnknown)5 U) C  e% W$ n& Q  T% B+ f
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']/ d* u2 P+ y. C8 N6 {1 D! s
  68.   end;}  X+ J' @- L' X% F
  69. & j! X  P7 [" [# C& m' x
  70.   IPropertyStore = interface(IUnknown)
    & j) s# K3 x4 R& _8 r* G
  71.   end;6 I  V7 m1 m  ~, D

  72. # Q5 Z  b" X# a& G# o. J
  73. type
    ; z2 M, z, j" L9 ?" m5 s
  74.   IMMDevice = interface(IUnknown)
      }4 j5 V/ R1 z& t: h8 {
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    ! Z5 v" Y$ b; y+ @
  76.     Function Activate(  refId :TGUID;
    , ]4 Y; B. U$ J; l! b: ~8 T( b) C
  77.                         dwClsCtx: DWORD;
    . U! g( m; X2 x/ _
  78.                         pActivationParams: PInteger ;5 W" I9 A4 C+ q$ t, ?
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    . W/ U; I9 j( f
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    / l" ]$ c$ X/ V3 `
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;- X1 p+ M% X9 O  v
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    - j" y7 [6 a7 a2 B( L  J; v

  83. . K+ j# t! N) q/ T
  84.   end;9 p+ T- Y0 q2 T: i$ C9 g
  85. : t  ^6 k8 R* h5 }* y

  86. + M$ p  Q3 g" s; M# Y4 ~6 c
  87.   IMMDeviceCollection = interface(IUnknown)8 }. X- a7 s6 S9 ^8 O4 M
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    & p, I; d0 K5 O0 b- i
  89.   end;) t0 x5 a& H) I" w' y, m

  90.   v0 x: A/ G- N* }1 V3 K, n' r
  91.   IMMNotificationClient = interface (IUnknown)& Z5 K& L" w: C( e+ c
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']- a3 u' p6 s) \6 l
  93.   end;
    6 e. |2 c9 z# z, }3 q8 M9 H* ?

  94. ; s4 b# B4 o9 o3 G- c/ l7 A0 ]$ x$ F
  95.   IMMDeviceEnumerator = interface(IUnknown)- h6 ]' z, Y  N$ k3 ~
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']8 _! p. f8 r6 {! e3 m* u" A4 v) O) ^) g
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;) P2 M, ~. q& C( e$ t) e
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;9 Z( K7 y7 ]0 U( T0 |5 C# W
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;0 f3 a+ {' `0 a* v) a
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;6 B. T% \! j$ o1 |  x
  101.   end;- m- k2 b  |* S8 Y; x, M. f

  102. % L! s* x, E2 J: V, N+ C/ ~& d
  103.   implementation
    4 @; f4 ~1 a% [# f; u7 e
  104. end.
    ' J" T* N+ a' j. G' n+ @; e" r' J
  105. / s/ a6 Y* e9 O9 Q. L
  106. Thanks & Reagrds,# I* [: }0 t9 P& X* H! f+ e# p
  107. Mukta ...
    3 `4 _: h8 ~5 E! M; B( u
复制代码
  1. * }+ A( n- e+ T$ _; z4 {0 x
  2. it's work in Delphi 7/ S% l+ C3 Z' S/ m. R* a
  3. //////////////////////////
    : s( C# |! c( M; o
  4. - h  k& N) L) ]# ?0 \
  5. unit MMDevApi;
    . o$ o+ e; [$ v7 I9 }& g
  6. , ^2 ~; c4 v* A& G, j: ?( L* W
  7. interface& }' ^7 y/ E; f5 s0 T6 M2 d) A0 [
  8. + J# F7 X+ l4 N* J2 i  k
  9. uses7 P! T0 k% x1 l' \: K3 R
  10.   Windows, ActiveX, ComObj;! b4 {( V' C9 ?2 f4 C/ a6 e' V

  11. / d9 }5 s6 c5 s' }' y8 ^
  12. const
    1 u  j) g+ Q4 U* k! L
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';, @) J$ s" k8 e$ E; Y
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';! V& e) m0 D7 P' m4 r
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';$ x) v) k( @9 c% S6 n; Y$ m
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    3 b1 D, f* d/ i& a
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    6 e8 S6 r' b# I3 C6 S
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    2 J" M: O0 `+ g
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';! u& q& q% e, Q; |7 M( @
  20. 3 T2 S( z) |) ?7 h; a  z; Y
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    ! W0 v, s0 u# @/ ^; J. }
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    ' ]+ W* J' P, a/ D6 Z
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;: S! X# _0 s! j. q& s- O! @
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    : g$ O8 s0 _- k$ b% z( l
  25.   R5 q) s; p0 s# G1 R
  26. type
    % N0 A* Q6 }$ p
  27.   EDataFlow = TOleEnum;6 P- H- p) F  ]* C& h. I5 s
  28. 6 |/ R* v8 p* w1 f: u) s8 k( _
  29. const
    ' ~$ W- d- [3 \1 \9 @# T
  30.   eRender                               = $00000000;8 R- u* j- G3 n
  31.   eCapture                              = $00000001;  Z  E! Y) p. H" S
  32.   eAll                                  = $00000002;
    % z0 ~$ ^; s/ [  X' N( s
  33.   EDataFlow_enum_count                  = $00000003;8 |( G* w9 t, B( A) _6 ~6 Z
  34. # L) ~* m7 t# w8 y0 ^. j8 M
  35. type
    7 A4 E& I+ ~! a% y- k7 m* C
  36.   ERole = TOleEnum;4 B% ?# D0 N  L) S& N
  37. 9 G2 A9 ]7 A6 s$ e
  38. const$ v3 T$ |2 M& _- k: e
  39.   eConsole                              = $00000000;
    % F: U( I# y: V3 ]8 k$ f& A  U
  40.   eMultimedia                           = $00000001;
    ' g, o) Q' _% g
  41.   eCommunications                       = $00000002;! i, |# q8 C4 |2 n/ c
  42.   ERole_enum_count                      = $00000003;' u% |) E( J! i" d1 U& n6 d

  43. ( e# p  J3 `7 w. A  c# e$ M) H3 ~
  44. type
    & a3 h$ K' L/ @: b) @, _: N' C7 n
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)0 w, Q! N( ?4 F$ u' }8 B9 H7 ^
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']: A% l9 b( x- Q& H" n' O
  47.   end;
    6 w* E1 D6 i8 x' {7 d
  48. / t: _* x6 R% \) \8 [
  49.   IAudioEndpointVolume = interface(IUnknown)- h; B$ P- S4 h6 B
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']5 _% J! X/ G+ V7 E5 V
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;: x, I9 u5 n0 L: _
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ( H. R8 T1 Q# q1 }9 J
  53.     function GetChannelCount(out PInteger): Integer; stdcall;$ s/ U  O) @, V9 [
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
      O3 }8 z! ~' X8 `
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    $ I: e5 z/ G1 ]! i
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;; i& Z, Q& K) a' j7 D
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;" c0 A1 `% g5 A2 q6 i
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;' O* K) J/ p7 r& U, G
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    6 F* H* E4 J+ V. v9 s4 o! u1 q
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    . P- N, K5 @  e$ s, F- Z: {; P9 Q
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    + ?1 F% a* Y2 B3 g0 Q
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;8 A- Z1 j# m) N3 `0 E; h
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;# t; r  f! K# x: U4 c
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;! N4 v5 h1 B0 ?9 M8 j4 i& ]# Z1 @! z
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;9 t* Y" c* Y+ _) j3 R
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;1 W4 H+ A* v3 y8 q
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    : s; J& A; O4 K2 X* U
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;: S0 H& v  J$ {5 X: |
  69.   end;
    , ]4 U0 M, O# H
  70. - X4 P+ @$ G  M2 g. j5 F
  71.   IAudioMeterInformation = interface(IUnknown)
    9 `- x5 o7 F4 I+ i3 U# {
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    & \, v) I1 r1 }. Y5 v+ R( H  N
  73.   end;2 p% p* P$ I) h: v5 D  S
  74. ; N9 Q" i" g2 T5 \/ _
  75.   IPropertyStore = interface(IUnknown)6 N& i1 U& Z6 P* g( I0 ?
  76.   end;8 P2 G, w0 x  M4 S
  77. , i$ f! g; t( O" {
  78.   IMMDevice = interface(IUnknown)2 {3 y3 ~/ j, Q8 k- t, j
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    " O7 N+ y# Y' n) r. }, U1 c4 M
  80.     function Activate(const refId: TGUID;/ B4 P3 L* X! U: Q" _2 ]' B4 s1 I3 z) D
  81.                       dwClsCtx: DWORD;5 ^' C4 n0 e% M# I5 E
  82.                       pActivationParams: PInteger;
    ) n) v$ j" F' G8 \" s/ B3 ?
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    & w: B0 A" J7 ~0 N
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    ! G! P) I! V3 n  F
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    9 j6 ~  O- E! m1 K' h: i$ B3 z4 K2 T
  86.     function GetState(out State: Integer): Hresult; stdcall;
    1 {6 _7 C+ w) H; ?4 z
  87.   end;
    2 S6 P: o/ j! |# T! e$ S+ \5 d

  88. / \- c/ E5 Q$ e7 F' n9 R

  89. 8 r  P" N8 m( |# X
  90.   IMMDeviceCollection = interface(IUnknown)
    . J4 W6 L. s- z+ I! H
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ( R) u- l4 Q8 t2 h' e/ F8 n0 c
  92.   end;5 Y6 m. l, P# Y* i7 ?0 t! s
  93. 2 R  d& b/ D' z4 Y+ N6 S
  94.   IMMNotificationClient = interface(IUnknown)( n& I% @1 v' E" ^
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']1 O* m+ s; J- _. Y
  96.   end;
    6 c3 O' Z5 j( Z5 ^

  97. . @: w* j' v3 d. S% g! o
  98.   IMMDeviceEnumerator = interface(IUnknown)
    7 K3 ^! A- e+ j
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']! n" i3 V# j6 s& L4 e4 C) i
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    . b5 {- c+ ]) K5 x" x. ~. u
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    / {9 ?+ W* Z( k$ X# b2 d
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    0 [' b* Q% h  b9 ~* e* V
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;3 C: V( N. r! g1 t0 Z0 p( {! U8 h
  104.   end;2 Q+ R$ H- Z+ w+ g3 u

  105. ; X6 l# S* x( w: a* _3 |, E. Y
  106. implementation
    0 ?  v3 u! O/ R6 T" ?1 c: v
  107. + k6 c# U8 B+ v3 A
  108. end.+ f/ H. w/ Q. q( k. Y, a

  109. ' l+ l/ \+ c9 m7 B: f0 [
  110. ///////////////////////. e( h. G6 f1 t! b
  111. simple sample :)1 F7 P3 u5 b/ t: j7 H) k4 V  ^
  112. ///////////////////////. w' m0 m5 b0 r+ Z1 h$ r
  113. & i. e# n" u4 |# W' y$ ~* ?% p% P) S
  114. //...... other code
    5 C  `7 P& w9 z  P) M, B- G

  115. ; x5 A- {$ d0 D- v
  116. uses ... ActiveX, MMDevApi, ...;' h9 J; D7 z9 L' P
  117. 4 m: S/ Q/ c" M7 ~: U; c
  118. //...... other code0 b  g4 g* e3 E, ]
  119. : \, U% X( G3 J& @) v3 N& x
  120. var/ ~% K: _' b6 W' y
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. 5 N7 V$ I  ?  X- |( n
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var
    7 a4 B. o$ y* y8 u
  125.   deviceEnumerator: IMMDeviceEnumerator;. Q& p# I4 ]$ S
  126.   defaultDevice: IMMDevice;& J4 w: t6 c+ U5 G. Z5 O) t4 p( x
  127. begin
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  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
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  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
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  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);' ?6 j+ R$ x6 ?/ H: a3 L+ ]3 Z5 J! ?% K
  131. end;
    7 F4 ?' \4 `* B( R
  132. 1 G1 d3 {' `9 U3 f: m
  133. procedure TForm1.Button1Click(Sender: TObject);4 z. i6 ~# F3 f  X; I$ \6 F. M
  134. var% y( V' i! V! F$ @0 H" M
  135.   VolumeLevel: Single;. f8 N& @4 m- i0 P; K" s* @
  136. begin
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  137.   if endpointVolume = nil then Exit;9 A+ V1 M% k5 H# ?; ?! L
  138.   VolumeLevel := 0.50;
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  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);4 Q$ r; E0 `6 c3 S6 e
  140.   Caption := Format('%1.8f', [VolumeLevel])2 j& d" d5 G! Q
  141. end;! G: ], D3 ?# a+ E  a4 e
  142. 6 u$ i: u( o% \. X3 i
  143. /////////////////////////////////////
    + S7 Y2 X. S$ B+ z& ?0 y: k( f8 `
  144. , T/ j/ d, s& U+ J' j4 Y
  145. // with best regards ToxicDream5 ^2 L1 d  F! [! A! I
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