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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 Z4 S4 L. r0 |7 V) m) x
By Mukta & ToxicDream

  1. 4 V1 ~4 d- N' B- G2 r
  2. //for delphi 5* [; h, X$ E8 o" V  V* Y
  3. unit MMDevApi_tlb;& K0 ]! b& e, p, P8 X! E, \- y3 u
  4. 7 O# R1 }0 E  s) a9 N6 x
  5. interface3 @' N  g! w+ w- a
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;* L, L: w6 q1 Y+ z; g) o
  7. const
    4 ~2 E# F2 U1 A. I6 ~
  8.   // TypeLibrary Major and minor versions. P) @, ~( H: f! r6 ]
  9.   Q/ Q# ~' r/ e8 d4 h: o+ Q
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';' W; X6 _% W2 ~
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ; W& s1 A" ?5 Z# j0 c1 q# q; M7 u
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    : X; P* M: b8 {+ j& k/ n
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';6 ]% p; K" \  G
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';# }, X. U2 l3 B! p+ y% j$ s3 |
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';2 Z5 d6 R, Q9 G) a
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    9 i. I6 j& b( `/ `7 J. g

  17. 6 ~& k8 s4 Y% v! E6 Y
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    ) P3 _" Q- h  j* n* |2 r& M
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;4 f. F0 E9 J2 a) j1 U4 C8 z
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    5 e+ c  q- _: ~& F' U
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    & Z( h# V7 t4 i0 Q/ Q/ s/ h

  22. 4 I/ {/ Q; U7 q4 ?* m) w3 X/ _
  23. type: H2 X+ ^& I, W& b" @* y
  24.   EDataFlow = TOleEnum;
    ( P& s2 U- B. m
  25. const* b6 m4 g  G! B) X- ]
  26.   eRender                               = $00000000;0 @0 K- e  m' G2 F6 i  b1 ^
  27.   eCapture                              = $00000001;
    ' M3 |3 ~9 k5 l9 {0 a
  28.   eAll                                  = $00000002;% S: o% F6 P3 C" K0 f* a& i" |9 Q
  29.   EDataFlow_enum_count                  = $00000003;6 m' w9 E7 _; `' L6 d: D+ h7 o! U

  30. ; v' ]( c7 Q# m- ]
  31. type5 @! m& U7 N8 Y& }2 R
  32.   ERole = TOleEnum;+ y3 Q& [4 |, n- N2 q' s. Y
  33. const
    ' D' k$ F4 k* K0 Y
  34.   eConsole                              = $00000000;: Z3 r' ?# m" m& @2 [3 G
  35.   eMultimedia                           = $00000001;
    0 O9 G( q- q6 a1 c3 p, B: ]
  36.   eCommunications                       = $00000002;" U5 J- W6 x' W
  37.   ERole_enum_count                      = $00000003;/ m$ Y) B2 G9 i' g& p: A

  38. ; J  s  N- S8 S+ K8 f) \9 E- h8 @
  39. type( q, f" N# \; ~1 ~
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)7 o( X. ]8 d8 P0 c# D1 X6 n: a
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']! f' W' n$ ]+ S4 X* j
  42.   end;; R- w) r( T/ W: ]6 T- _) u

  43. / L/ d: k' |7 f  z0 b
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    9 `& i% I9 I8 i, n: }' J
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    0 ?3 i# G/ t* g3 x! U0 O
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;1 w/ Z4 g/ C2 H3 ^- M# @- E& O
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    $ V# {4 M5 B2 w- h6 k2 d
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;. z7 [0 I$ W9 h, V, }0 m  M! l
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;0 J" s# a) r! l% b) n+ X
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;- |) O9 C; A$ F; \; M- L) g
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    9 s) h+ S2 u" |' m
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;  {) L* I) E$ r6 m$ \5 g8 ~' h( P
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ( }% P9 B0 x% b% x- i# u
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    9 T, v! `, @$ E7 T. U
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    ) r! K2 V- Y6 @+ v% ~. `
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;0 V* J7 `2 ~1 g* ?
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;2 F) T1 w$ d- R' j4 B5 a
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;& o; V  X" R+ l, O
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;, P1 f1 S" T; Z
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;" I3 |/ _# Q& S6 f+ @
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;* i3 K/ m9 l! O" e' @4 _1 R
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    - G1 G/ L1 n9 f( o! N9 K5 Z7 _
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    $ f# Q( T  L- r" h# ~
  64.   end;
    4 `% u! g& S1 q+ i# [" o$ F
  65. ' Y0 S& G# [$ _4 }" V' k$ o9 m
  66. {  IAudioMeterInformation = interface(IUnknown)
    ) i  o6 [' b( ?
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    ; x8 d( A$ U1 O7 t2 i6 d! B
  68.   end;}
    7 V4 l8 A6 Z: R$ x

  69. , O: _( y1 u4 |
  70.   IPropertyStore = interface(IUnknown)2 q* M0 S! t5 {6 e+ I
  71.   end;
    * Z: G+ W9 O+ t! c% i' e, N( H

  72. # O% f& M& S1 A  b" }/ U
  73. type
    ; Q+ ^1 E1 `  G
  74.   IMMDevice = interface(IUnknown)9 B; B$ F0 M4 w, _9 `$ G
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']  v# l2 o+ G* c* g! q- q6 W
  76.     Function Activate(  refId :TGUID;
    8 T9 H4 K; Z7 [) D$ s
  77.                         dwClsCtx: DWORD;# Z9 M% V% A: r8 W
  78.                         pActivationParams: PInteger ;
    ' n; X! I. c* W/ a3 ^* Q
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    6 f3 m! U8 O+ W5 v1 J
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;; x7 @* m3 D3 b5 R
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;" z' P( P% `: D. ]  |5 {" t+ h
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    0 m* {! v9 M5 H' n- y7 @. g

  83. - F( I8 I+ F1 Y% N7 u
  84.   end;
    * R4 o) `9 s0 i0 s& u; s. B* J: X
  85. $ U) T* O8 l- o7 `+ g+ E) R5 C& c
  86. 0 ]0 z2 T. u9 j9 L5 @+ y
  87.   IMMDeviceCollection = interface(IUnknown)" y7 J/ n$ K# D' r' W
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    " m5 c. |9 X  `: {2 O( C
  89.   end;4 v: g" B( \+ |' t, b

  90. % o8 m/ B/ a+ O5 u
  91.   IMMNotificationClient = interface (IUnknown)5 A' o8 a, ^# C, U2 h# N0 p  C5 q/ d
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']% Y: `' I% J6 g, ^0 w% }1 M5 T* C
  93.   end;! F' C5 r: j% l, g$ S
  94. 0 y9 O+ {( _* g, @" _. u7 Z
  95.   IMMDeviceEnumerator = interface(IUnknown)
    9 o; z' {+ o/ |% u0 Q6 r3 l) s# }/ F
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']1 l/ h: @( [- L7 o, I2 d  X4 m! K7 ^
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    8 [6 C9 @  h. k8 F. }1 g
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    1 Y: U# n# B+ M% F- ]
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;3 U" _( T, r. m/ k5 {% q' p
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;, s) i8 k* g" Z1 A  h
  101.   end;
    1 r/ o! C8 ~- b
  102. " B4 u/ Z) K, s' d7 c: g
  103.   implementation
    0 N" O; O. H; t/ G2 [
  104. end.- Y. s; i9 M' X# L' Z( T+ o+ o$ G
  105. " ~3 `' {; e* w8 |9 W$ F
  106. Thanks & Reagrds,7 m4 ^/ }3 b! [& h$ m' b/ k% S
  107. Mukta ...
    1 u( n' z& I1 P2 z- a1 D, A
复制代码
  1. + h9 [( |% [* l; ~4 e
  2. it's work in Delphi 7" r4 d# _6 G$ d/ H) Y) I- R
  3. //////////////////////////
    * q; p# ^# p, n
  4. 8 }4 L4 @4 }6 R: T: g5 C
  5. unit MMDevApi;0 f( k# y3 k+ Z) q6 @% u

  6. $ p/ H- {' |5 j) u0 |
  7. interface
    8 r3 x- [; k0 Q! C, \( J& y
  8. 7 W' {7 F" H3 w  z8 ]% ?/ }
  9. uses1 e* }9 `1 S6 Z- p- ]
  10.   Windows, ActiveX, ComObj;% n$ G: A3 i; l% J: V
  11. : Y1 U1 N# a+ L% L& {
  12. const
    * n: w! w3 Z) H6 s0 {  \2 a9 P! i
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    $ e; @+ ]3 k  G$ v4 p- J
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';* T; K& g1 B$ T! n6 Y# S$ w
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    8 X4 E1 W" W% A8 R- ?: r" }# ?
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ! z. B, y, P% k% n
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';& {7 }8 h5 a  r4 d4 v8 p  s# z
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';. \4 F! z" I- k" `
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    1 E& U: ?$ _- q6 Z

  20. 3 O2 q) [! \2 O; K, J
  21.   DEVICE_STATE_ACTIVE                   = $00000001;! L' T( G- A# [1 s  e! _2 m
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    + N* l8 I9 p# V. Q+ J+ ?2 R
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;2 f% T2 V7 Y5 g6 D: p& `
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
      `+ _0 d4 h9 B/ R. B( h* c* t( E
  25. 4 b/ ?" k; L* D% {: [
  26. type7 ]- L) ?3 S3 e) l) R/ r% M9 `4 M
  27.   EDataFlow = TOleEnum;
    0 F: G$ j0 r$ m7 _1 V( m/ V

  28. ; Z7 v9 B5 o* q$ S' l5 ]2 \$ I
  29. const2 A/ K4 C, S$ E
  30.   eRender                               = $00000000;
    2 s+ q5 M8 m$ N$ z; i. e
  31.   eCapture                              = $00000001;* v0 j& ?! J2 V+ Z( `
  32.   eAll                                  = $00000002;
    4 q1 G7 Y: t- d' J
  33.   EDataFlow_enum_count                  = $00000003;
    / x. ?! f" E# d$ f# f6 P7 g
  34. " ]- }/ q" \6 E- a0 y
  35. type2 U. O+ d: ~& P; r
  36.   ERole = TOleEnum;$ _+ L. k" L# w9 t7 m( m+ v, d3 x
  37. 4 A9 ]4 I; c' a
  38. const6 x5 l+ b3 a  m( ~: O3 N
  39.   eConsole                              = $00000000;
    " M9 f( P8 ?3 s- c: N* x! p
  40.   eMultimedia                           = $00000001;* I! C/ Z- T  S6 |3 L: L: J1 ~; ]. N
  41.   eCommunications                       = $00000002;
    6 w7 s# N+ d3 C8 @3 a
  42.   ERole_enum_count                      = $00000003;
    # V4 m+ Y9 w* T5 R# a4 H# F8 ~: p

  43. 5 c( Y' W2 h+ ?% y  s1 o+ a
  44. type9 }: `- q7 ]$ L4 ?; n
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    6 J" V; n, X9 N4 {& t
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
      `) R) [2 T0 r( a5 w$ O' E7 c
  47.   end;1 E, ^& [0 r: ~% G
  48. ' |' V+ O3 w- n) ^# k" ~
  49.   IAudioEndpointVolume = interface(IUnknown)1 f3 B& r0 @. L
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']4 f' o9 e& j$ @# \4 S( W
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    0 |! V$ Q$ P3 H) S% E9 j
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;( U3 j5 s7 v3 J3 {
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    . P! K( i3 M+ b+ y1 y! [! `, S
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;9 S# O, c, F5 j% `  C% H% C
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    # [7 o$ ]4 E8 j- S: W. l; u( n
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;, S6 I: g0 \2 P( o& H# V
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;" L. r4 L$ d0 u! L" U! a) i/ R' t
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    4 S- j; U, o3 x9 O1 M
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ! ?- F0 Q# m' V3 i
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;& T$ Z4 v  H$ J* P/ D
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    * x' y$ h1 b" V) K* t: i
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    4 `& V* }1 `6 s
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    * u" M; R: V4 }% s: C
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;) K+ V8 b* M% p' p8 Z, N
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    & H& q8 s1 d& O* Z; p% m
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;, t3 f2 A4 H6 I1 e0 w7 ~
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    5 T: `' x$ K4 f
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;* Y6 B/ R7 Y  x% S1 s: W
  69.   end;/ a3 H9 e! Z5 V/ h- T3 L$ {' p- S
  70. 4 m5 N/ u/ u3 J* V
  71.   IAudioMeterInformation = interface(IUnknown)
    ! Q7 f7 }  u. M, \
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    6 l' }8 u+ c8 o# ?8 q6 E; i
  73.   end;
    , G* i1 h# E; w% z
  74. ! u" i) r, n( P" W; P  J
  75.   IPropertyStore = interface(IUnknown)+ W  p+ o/ k( A' I; o  K
  76.   end;6 J9 P3 P8 e( i& N$ r' Z& P4 h
  77. 0 G$ W. {& ]0 R5 h
  78.   IMMDevice = interface(IUnknown)- w9 m" G- r0 I& `3 s7 ]! g' m3 j
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']: {! s. }& }# @' R1 n
  80.     function Activate(const refId: TGUID;
    . i2 X5 F: U0 W# Z6 {, T
  81.                       dwClsCtx: DWORD;
    & W; |; `* T/ _- T7 q& |
  82.                       pActivationParams: PInteger;
    % P& Y8 o% L: F
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;+ Y$ q* |0 ?5 N! N- c
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;8 i8 t+ Q+ t4 ]. \$ D
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    $ {0 d$ F) C& V. y" |/ t5 F: G
  86.     function GetState(out State: Integer): Hresult; stdcall;: H! ?4 W) V& t) U: y7 K; @
  87.   end;5 K( m& I* s) x+ p8 y6 ]

  88. / X, q0 a+ ~2 j3 L0 q# U
  89. $ _. P+ P3 m0 g, {( t
  90.   IMMDeviceCollection = interface(IUnknown)
    6 ^0 v8 f: C; D0 \
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ' k4 h3 T  o/ X& z2 }0 S
  92.   end;
    4 H2 A5 J- e$ C) d" A

  93. ( N% ]+ A% g- r6 {
  94.   IMMNotificationClient = interface(IUnknown)5 X- O& l/ m% H
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    - R7 z9 D+ j  K
  96.   end;# B9 w) T$ }. d8 O

  97. ! j0 B# p  {0 t- h  w6 l) h" Q5 T
  98.   IMMDeviceEnumerator = interface(IUnknown)1 W$ ^' j3 S9 M( v' T, @; E
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    + S: g. s5 ]2 {' v
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    0 |2 x+ P3 ^9 p& d
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;' ~( b1 h+ a  b
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;, }( a! x% r* m, e" U# M
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;! Y3 ]3 g# {0 {2 C3 j3 ~, T
  104.   end;
    5 |% \+ c6 Y' \' ?: U  Y' v& L5 y
  105. 2 `+ h) r7 p; `- j  b' ~
  106. implementation
    ) }9 C1 m+ \7 a: q* F

  107. $ p  D4 K" ~- K  T& I3 y
  108. end.! T# }$ n. I. A
  109. 6 |* V0 \8 F# y5 ^
  110. ///////////////////////; c1 U  G! a- g: R. y# P' B2 ^6 h
  111. simple sample :)! s6 ?! @% S; A4 c: X) N# M# o; U
  112. ///////////////////////, F5 [  E4 J3 |5 \8 u
  113. ; U+ d) e7 `8 p0 {) x
  114. //...... other code
      p) R0 t$ {( v) _% J- D

  115. , r7 [- ~/ Y3 l. D% X7 B
  116. uses ... ActiveX, MMDevApi, ...;& g0 ~4 E/ C/ W2 Q

  117. + t3 r' `" X, ~9 b7 E
  118. //...... other code# }+ X) o) _3 X: k6 ~

  119. " ]  |# A$ i* L4 d6 v' e, r
  120. var& }! G! w3 d# q' ?! J+ y
  121.   endpointVolume: IAudioEndpointVolume = nil;' v1 c- b& |+ ~

  122. 3 k$ }' l- x1 D
  123. procedure TForm1.FormCreate(Sender: TObject);) S( Z! F; k7 Z
  124. var
    + \2 B' S4 v2 M. _1 R3 C/ c) Y
  125.   deviceEnumerator: IMMDeviceEnumerator;
    . ~# t( K3 \/ B" y( p" e  {
  126.   defaultDevice: IMMDevice;- K/ k) P8 A4 a1 v& L
  127. begin
    % P4 |0 U! g% \6 H. k
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);9 o1 O8 L* S: g' f/ X$ k$ x2 x
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
    9 a" E* B8 ]8 X0 v$ V. n8 E9 g
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);: v( ]$ }( w5 K! |
  131. end;5 U$ {0 c( C+ S
  132. 7 m0 _6 }4 d; |; g6 E
  133. procedure TForm1.Button1Click(Sender: TObject);
    % o4 O9 U' x/ `
  134. var
    % o, V/ i0 {, l8 K) t
  135.   VolumeLevel: Single;
    7 M$ q# W2 i4 _  [0 N7 ]" m0 j6 Q; E
  136. begin
    ; u) h% g4 i, X2 x
  137.   if endpointVolume = nil then Exit;& \  R, P" x4 [
  138.   VolumeLevel := 0.50;
    ; f, b% b* u3 P6 D' b# u2 r9 ?
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);/ `) H5 f+ W+ x$ K7 y
  140.   Caption := Format('%1.8f', [VolumeLevel])8 H+ m$ g- ?( w# P
  141. end;; L) H3 {) g$ L7 L* q9 |8 ]+ L
  142. ! s# U' }" X$ {5 o5 N5 Z
  143. /////////////////////////////////////
    ( ~) @8 ?8 A0 \7 W* j
  144. ' H1 ^4 w. @/ m$ Q; ^. G* b- y
  145. // with best regards ToxicDream% n' j7 @( a% ?" p; j: n7 ]5 N, f
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