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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-a8c9-2e27eb9ec0580 w$ Y; ~3 d; H( f
By Mukta & ToxicDream

  1. " p  p5 E1 h/ c8 g
  2. //for delphi 5
    ; [+ p/ @+ N8 @+ R
  3. unit MMDevApi_tlb;( t) I) r- L! ^7 Z! o0 y
  4. 5 z: D$ c6 \' j* H! F
  5. interface
    5 B9 n3 R" l( M; N  \, z
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;- b& ]2 c4 E" J* ], ^- X
  7. const" T3 D9 t( s+ z* X  ?
  8.   // TypeLibrary Major and minor versions( v9 F% Y: i# f
  9. 4 f! r# ?' d1 B6 D
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';7 @9 l6 w$ Q9 w* v# L
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    - g2 h1 n5 V9 i0 H9 H; Y5 B( l
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';! F4 }) i" H: b% k1 U8 ~% k
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';) w. a6 N3 K& R6 m! F8 c9 H, o
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    6 u  u/ @9 h- u/ z( f
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';/ B% t8 ^$ [! G. E  F- ^! T- @
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    9 K1 p/ ]' K1 D0 j

  17. + D$ ~( m" X8 M+ v/ J$ O, X3 i* v
  18.   DEVICE_STATE_ACTIVE                   = $00000001;9 O4 O2 I% v% b, ~  X" `) g
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;, t5 [, s, H7 C3 o. X, e7 D$ C( k
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;. B6 {& J3 [" k1 ?8 u3 {
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    0 k0 Q) u6 @  Y. M4 ^9 Q4 p( D

  22. 3 `& u% w. y4 I( g7 W+ c
  23. type4 Z( ?; l; G- J' u: {- \% X4 z6 h; W
  24.   EDataFlow = TOleEnum;( y% H' p; p- W
  25. const
    * C2 H( o  V  A( F5 v5 U5 }" E) R5 K
  26.   eRender                               = $00000000;
    ( [: `: H7 r/ S3 L
  27.   eCapture                              = $00000001;0 U: U8 F# B# _: Y
  28.   eAll                                  = $00000002;
    4 L8 N" I; _7 d5 D4 X
  29.   EDataFlow_enum_count                  = $00000003;' x# s( ]8 W6 H
  30. + [" w+ m! B/ q! x3 I- d7 V" R
  31. type
    / F9 X+ h) \& U7 f# I* P) Y
  32.   ERole = TOleEnum;
    $ _1 _# T1 S# |4 p; T
  33. const# g# ~2 t0 V  U) [, T
  34.   eConsole                              = $00000000;
    ' k8 F, g* D- u9 ^
  35.   eMultimedia                           = $00000001;
    * L7 l% {4 x7 H/ |" t" b* R
  36.   eCommunications                       = $00000002;
    ' V# n% `- |' ~8 m" `, C6 u- p
  37.   ERole_enum_count                      = $00000003;. z* r2 p& i% \$ G  D
  38. * h' K7 @" s, h0 V4 A0 @! R0 E/ v' E
  39. type$ n' q0 Q4 H4 J: _# m% A7 A# ]
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    $ s3 `( ~! q' J4 X9 e
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    4 Y5 P8 h/ r/ f$ q
  42.   end;5 }# q7 N$ t$ U& [: W( K# }/ R

  43. * d- W$ b: e( z! x8 q5 J& P. s
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    + U; V- N; e' Q  ]
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']% |2 f2 X7 N) _) [/ p+ O" X& z
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ! Y6 K5 X' ~; b: e
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    , g" G- w9 |* q# t: d
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;' X9 {. m5 S/ }" q, b5 R: a  \; v
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;9 E/ H, d5 M7 O, [$ W* W+ y( b
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;3 a5 p' B4 y  N- @2 X( y! j' `
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    $ r& ?* C# z% ^6 ]' R) B0 C
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    9 T( U+ l+ I. {0 [9 M/ Q
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ) g' _/ Z( z4 f( a' L) J7 F: s" Y  c
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    3 M; ?5 o, t5 L; f4 g9 }
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    1 p8 |. J. p$ X' `) v
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    5 ~$ _1 t! E# j, e6 s' `! |. y5 w
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
      P0 F$ ^0 P" Y2 _  K$ ]2 ~) N: Q/ l
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    : }8 l* p5 m8 n( X" I: U: l
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    ( d2 b/ I$ b2 e) P/ \! H+ ^
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;2 ?" C: [+ a2 J2 @  T6 ~" V
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    4 U$ E1 l3 `/ p6 S' K2 [. X0 z6 h
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;6 c! T- r9 c/ p  l
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    " C: l( w+ v& o3 D3 L! s3 f
  64.   end;- ]) b9 W( p$ }1 P8 J4 \

  65. * [* l7 `* |  C( W, j: a0 m
  66. {  IAudioMeterInformation = interface(IUnknown)% T- f" ^' m, |* A% d% X0 m
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']- i) J1 p5 z- F  u; L9 S( c
  68.   end;}
    + N2 l. n& y7 [- O" ~. U: _
  69. 2 n5 H8 l1 T* L4 z
  70.   IPropertyStore = interface(IUnknown)
    & |9 v5 G) E: j$ }' q% ^
  71.   end;8 V& h+ X+ z! B
  72. 9 ~7 r# M7 v. a+ Y0 a7 z' D1 R
  73. type$ \" B- k: D) u6 A9 b9 i$ @
  74.   IMMDevice = interface(IUnknown)" y4 u' Q$ `  h" T$ S
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    ! A3 P! n* h7 `) m) ]& G" x
  76.     Function Activate(  refId :TGUID;
    $ w$ y2 @/ ^- v+ `4 V5 U! B. {# M
  77.                         dwClsCtx: DWORD;( q; q" D# x' O: b2 v
  78.                         pActivationParams: PInteger ;
    + N+ c' g4 g0 z$ e" F
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;4 `' r0 z; K# W/ y+ a$ @
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    " O: q6 S, f- g. s: T: Y: O
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    ' f/ j0 d$ r6 Z2 D6 s
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    2 B0 L( ?3 m$ ~* i

  83. * p1 ]8 n* {, T# c9 k* K% E
  84.   end;
    4 L5 j' d. j- o
  85. 5 i+ ]; ^  g; Z2 i9 \9 z
  86. - u  U1 \! C# j, M5 z. ~
  87.   IMMDeviceCollection = interface(IUnknown)
    , p, @$ \. ~; h
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']! P/ [, ^, Y& m( I! L
  89.   end;6 H0 x/ b- ~. l9 c* N
  90. % e# _' D$ \/ X" y) z  z* I
  91.   IMMNotificationClient = interface (IUnknown). y  a# p, E8 Z/ G: f6 v1 ^) L" W% R
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    9 @2 }) M' s" }' r# r& ^
  93.   end;
    1 H4 m6 h1 e& Z% `( ^
  94. 8 t( x" ^) k' b/ k; k2 U8 O
  95.   IMMDeviceEnumerator = interface(IUnknown)
    4 g& M) v. P8 [
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    & o. \$ U, D" N* x
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;" K: ]) S1 J8 i: f
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;+ Q. Y1 E  y0 {- j  J  E4 S9 J
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;7 J+ c6 V1 `% d9 M" c; }! P5 x
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    1 W7 X0 i/ ^5 _9 W8 e: R* q: J
  101.   end;6 ?: h, H7 P+ j

  102. ) ?* D( q  \5 c& }" o
  103.   implementation7 R9 O3 x. v2 F0 a
  104. end.
    8 b2 j. z# W, v- U$ t
  105. 3 z% h1 j2 J: C4 e* h
  106. Thanks & Reagrds,
    9 `& J; w6 Y3 {$ N2 U. w  d
  107. Mukta ...' O* A8 i- ~, s7 h" _' U7 o6 w
复制代码

  1. % y4 U3 S/ _# k( W
  2. it's work in Delphi 7
    7 Y& P7 u5 y7 [* u
  3. //////////////////////////8 A; J. r- `" W9 i- g
  4. ; Z% m& a, o9 B8 z1 P- B0 Q
  5. unit MMDevApi;' R/ l" i  `0 ~' k
  6. 3 B! P2 `; j4 N' U% r, Y
  7. interface! U* F/ {- a. b, \6 X! s
  8. & r' ]6 T# S6 O6 y! m, _8 F
  9. uses; ~7 \) d9 j, b2 B
  10.   Windows, ActiveX, ComObj;& W& j) A5 \+ U

  11. ! b$ r$ m- ]+ N+ ?
  12. const' a" T; s5 g* _6 S& z. E
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';( z+ {! S( N1 n  N+ K* Z( h
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';& v3 Q6 l4 d9 c! b
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    & U- a/ O% u: I' W2 @. o
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';4 |6 m  f2 r8 }7 |* M" u
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    ) J8 r  T4 ~6 k" |8 ]/ L
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    : Q& O- n7 M& Y6 J6 s( K
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
      N9 Q( n  H& R/ [0 B& f, n
  20. . A$ Y/ A7 Q' k. q' B% R" D7 s
  21.   DEVICE_STATE_ACTIVE                   = $00000001;% T6 Z/ q  C% C5 Q$ N3 N* K
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;  _$ C. J  B2 X) I
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;! U: M  O5 X8 @8 f. a
  24.   DEVICE_STATEMASK_ALL                  = $00000007;# @8 Q# c$ J8 r" ~1 O5 j& B

  25. / T5 A+ p+ c: H$ r* c( t+ }2 m- ~
  26. type
    $ Y+ ]0 L0 ~  v$ `  N0 z  D$ |
  27.   EDataFlow = TOleEnum;
    ( H% j9 i6 y  w; y& w' h

  28. ) z, q) T* }1 S0 v
  29. const
    4 I5 e8 R/ D. D9 \" a
  30.   eRender                               = $00000000;+ q) k3 K: q# Y- T  e( Q
  31.   eCapture                              = $00000001;; K6 _) w8 v9 w% S$ j0 I
  32.   eAll                                  = $00000002;
      m5 Q9 m# N/ J
  33.   EDataFlow_enum_count                  = $00000003;
    . e6 @0 k' Y5 t/ [# t
  34. ' V8 z# D* m4 b
  35. type& B" f  O% F4 i  m2 V& E, U
  36.   ERole = TOleEnum;1 u1 X8 j' J7 ?; s
  37. , |  x6 Z: S$ \8 M3 E' _8 w
  38. const: L) D% f  X3 M0 k/ r% |
  39.   eConsole                              = $00000000;
    ; t/ Y5 k) H9 T1 b
  40.   eMultimedia                           = $00000001;
    , D. V6 ~% y* J/ V/ x  x
  41.   eCommunications                       = $00000002;
    ' ~0 i6 e1 Q( y8 _" E
  42.   ERole_enum_count                      = $00000003;
    / K/ k. H% [( h& n. p8 a/ ^6 t0 }
  43. 1 Z7 Y& F1 }  b6 j$ C) ?3 u& Z
  44. type
    , S. ]  S% |8 X2 K- Q  W7 e
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)4 c( F! ?6 c& s9 w2 l
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']( p* a3 F2 ?5 Q& Y% d1 o/ s
  47.   end;3 n, f- H2 h9 X/ T7 N/ d
  48. : S2 `; c( [" \  f2 \" i  ]
  49.   IAudioEndpointVolume = interface(IUnknown)6 {! z' x3 m" F# R% x0 f
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    $ q" Z0 E1 c3 v1 l9 d
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    9 u) P+ `; ~5 H* A. c
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    7 n: T5 U' B+ P* O3 B( B8 D
  53.     function GetChannelCount(out PInteger): Integer; stdcall;6 {7 e" q  H. O* \( K7 U
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;9 |% U* w/ k8 x5 U6 K% g
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;  j. ?, T2 d; N2 T1 A
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    ) [, Q. L  t; t" d
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;1 L7 Y0 `' Y4 R
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    3 ?5 l  l9 F5 Y8 N( L1 S6 w
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    " S- T$ \' X+ N, w3 S/ E, L$ i- t, \6 r
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    ' @: N; u0 z; r. G# ^! d3 C
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    + v6 R6 U" k$ p7 [/ b  o) }
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;) G% K( w# @9 v# H
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;) i+ C7 V; h! v. W/ c1 ]
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;* K3 j8 K8 m% ~2 c  W+ L* |
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    % U" s; R5 T8 A/ K9 |. H# N
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;( c6 A, v4 ?$ A
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;# c% t0 J+ T8 d( F) ]
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;4 e% B! p& _, f, \+ B
  69.   end;7 O; X, w3 V5 Z0 J6 K2 q4 D) o
  70. 4 j, u- V  M6 L4 P' e4 G. q
  71.   IAudioMeterInformation = interface(IUnknown)
    7 Z: X2 c6 V& l( H* P. v
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']5 e% X% o) U3 m8 Y$ H2 ^% D
  73.   end;
    & F6 w4 R; G) m7 m' L

  74. 2 N) Q& W- J  ?( Y. ?
  75.   IPropertyStore = interface(IUnknown)
    8 |* O! n  T( O1 k2 S* p" Q; b
  76.   end;! v  W5 I4 T: k; d, k

  77. % h$ M' g, p5 ]+ c$ i( c# c
  78.   IMMDevice = interface(IUnknown), M* ~! Z" {+ E- q) t9 h5 _
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    7 J# Y/ O, @. s- \
  80.     function Activate(const refId: TGUID;  E0 d5 n4 k9 d* [
  81.                       dwClsCtx: DWORD;
    $ s/ @5 e- ~/ l6 K1 W6 z3 V% J5 p
  82.                       pActivationParams: PInteger;
    3 a0 {( t3 D8 u0 j+ i
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;) @% @+ v: p. \1 j8 [% t2 G
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;# v8 K0 X7 F; o: e6 h
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;7 ?6 d- q8 |1 M5 u  I, o6 K
  86.     function GetState(out State: Integer): Hresult; stdcall;
    + b, B/ B" Q3 d. o, P
  87.   end;2 T# n% S7 y/ z. o
  88. ( x) g$ _2 A5 X8 Y) Z% w

  89. + S2 U4 q$ L# _: r- R3 p
  90.   IMMDeviceCollection = interface(IUnknown), x0 @9 Y' Y* s$ B' }
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ; d2 e9 L' ^* T# \5 G6 s; _
  92.   end;
    4 @6 o) Q% W# g$ {# X) H
  93. ) [; x' n% A0 H8 E: b+ o- \% N
  94.   IMMNotificationClient = interface(IUnknown)
    0 F/ |% }# n- M5 q
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    9 e. [) X; F  Q9 Q% Y) x
  96.   end;+ X9 Z) M+ j: T7 A% q. w) q

  97. * k  k6 e  R  A$ p: }, u- `- o
  98.   IMMDeviceEnumerator = interface(IUnknown)
    3 N. g. u5 z. I* s) R8 h' u
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    ) x# n. f; j  {2 \
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    ) N  E( _9 Q0 O0 e# U
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;+ M& Z! _5 _9 `9 t. q, n" j" a
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;( w! s# O5 ~, o: G
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
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  104.   end;
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  105. ; k9 C$ c5 K- j9 b& k, f; c$ \- K
  106. implementation
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  107. 0 ^) y5 i+ f/ m+ C! q
  108. end.) C+ s5 X8 _* o, M' N' c

  109. 5 H. ~1 U7 G* b( D5 c7 `5 g
  110. ///////////////////////; H* k" u0 ?% X9 {  ]! W) a
  111. simple sample :)
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  112. ///////////////////////
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  113. 3 n- W. M9 O; Q6 S6 }5 F
  114. //...... other code1 d" j2 V/ l/ R3 P
  115. . O4 v6 G4 a7 p# K6 Q
  116. uses ... ActiveX, MMDevApi, ...;
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  117. + J: C) Z0 }- m% P# ]; ~1 L* O- c
  118. //...... other code, L6 w6 t$ U* {2 I

  119. 5 N( H" I$ b/ \2 [% y% [& n* Z
  120. var
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  121.   endpointVolume: IAudioEndpointVolume = nil;. m: q- u5 W0 V, I5 b' z

  122. , U1 C  T! B) u0 g, R4 D
  123. procedure TForm1.FormCreate(Sender: TObject);# A7 N8 U1 P1 k3 N, T  z: S) n9 b8 X
  124. var6 Y* Q9 e* g" }0 J9 u) O# r
  125.   deviceEnumerator: IMMDeviceEnumerator;3 P2 B* t! P0 h$ `( Z/ a6 [
  126.   defaultDevice: IMMDevice;! Q! g8 A4 J0 e! E
  127. begin
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  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);8 @6 q4 n) z$ _2 e$ H$ \5 d( k
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
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  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);1 [& N8 s' }! f. N
  131. end;" t; Q- b, y9 v$ C% J/ L) W

  132. & Z9 y! c+ g) n$ Q$ J
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var
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  135.   VolumeLevel: Single;4 y& L, R" v. [: h$ i
  136. begin+ K! d8 Z% m6 v2 j2 i
  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;( q3 \1 X$ n9 u8 d4 S9 s
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);5 P% y; H- M5 u8 ?6 V! f3 w
  140.   Caption := Format('%1.8f', [VolumeLevel])* L4 R( j+ x3 k( R& P7 R
  141. end;
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  142. + D( t/ G$ \. z: c; c
  143. /////////////////////////////////////
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  144. 2 Y2 i9 \1 t9 m
  145. // with best regards ToxicDream
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