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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' `3 K- C7 Q* D  `' x
By Mukta & ToxicDream
  1. 4 t8 n4 H& O( ]; x% C6 G
  2. //for delphi 5
    5 Z' q& w, b4 a7 k
  3. unit MMDevApi_tlb;
    . M* ]+ @6 t- @) ^/ ?( _# C# J, Q
  4. 7 C  m0 f; h, O; h& W
  5. interface& F  j+ C  }7 h7 a$ k9 h
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;7 B/ e9 W" ?1 u9 ], V
  7. const* x5 b. J- F" t' F. h; B* N5 x
  8.   // TypeLibrary Major and minor versions
    / \: C2 v& G. K% n# R$ h7 ?% k1 }+ A
  9. ' G2 G2 Y2 v8 m9 x, D2 K/ A+ {# t
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    - m; ?& C  d' d1 ]2 c7 k
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    0 w4 \" H* b2 [2 e
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    - @! b& T& W5 t: q2 [1 K
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';2 u. m) L- v# R( j8 O/ H8 d
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    ) S0 ]$ {& }5 X9 v' i* {
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    * F5 e: Y0 A5 d( j' s/ u
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';; n" Q; m: w9 U
  17. ( c8 h& a9 H; c
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    $ n3 D! T8 ^' B2 a
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;" u/ r7 S2 }# x) x+ C; Z9 ^
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
      K; c# n5 `. C- b5 P
  21.   DEVICE_STATEMASK_ALL                  = $00000007;/ l. S7 Q6 Z) [# I3 e! t

  22. 8 W9 W- Y( w/ A1 M
  23. type
    # k$ U; x/ ?( |. i. j
  24.   EDataFlow = TOleEnum;
    1 q: j3 N( w5 Q  a4 x3 R
  25. const% B9 C4 y4 S) E  _
  26.   eRender                               = $00000000;0 U+ d) j3 ?2 b
  27.   eCapture                              = $00000001;
    / e8 s+ |2 M. }# j) ]
  28.   eAll                                  = $00000002;
    # Q2 {& }2 H1 o: j4 g/ k
  29.   EDataFlow_enum_count                  = $00000003;3 s3 y/ C* C$ X, ]
  30. , ]" o9 }7 ^% {$ M
  31. type$ s6 o: l. R4 n' M4 w2 f
  32.   ERole = TOleEnum;9 M' P! g0 z# J. B
  33. const
    5 D; Y, R# `0 w" O4 q( I
  34.   eConsole                              = $00000000;
    7 f, k+ n/ K1 `2 D4 @( {. D9 i
  35.   eMultimedia                           = $00000001;
    & r5 L$ }3 B! f: e3 D7 x# k! b
  36.   eCommunications                       = $00000002;
    , l' t4 Q) t3 E$ m( N
  37.   ERole_enum_count                      = $00000003;+ p( F: A7 }5 k2 f8 e/ N" b

  38. 6 \* F4 b( |& F- ?, d- V
  39. type' A8 N2 Z1 @$ B* u3 x
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)8 x0 `$ h! D, E7 ^  U* T/ _- @
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    0 Y# t8 y9 n; l: \
  42.   end;0 z7 }# j% p$ W2 R. P

  43. 0 y+ M. e2 b9 z- W
  44.   IMMAudioEndpointVolume = interface(IUnknown)7 y8 |( W5 b1 A! d$ X5 ^( Z
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    1 x* o! y; I6 J" c+ y4 n
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;2 ^' j' i  _. p2 o# h
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    & p3 Z) [5 q8 |3 U0 N- I8 f
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;% T9 d1 l. W; C- f- m$ H
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;; o1 G1 Z. V! m$ s3 L2 E
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    , F2 U. }& D- J
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    0 M5 H( g  r8 ?+ Z$ Z
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    * @( w3 Z7 W, a+ v
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ) G" y9 A! @0 z! G
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;! t) F( T/ p0 }/ X" D
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    8 R; ^0 h% U5 A! i# E- i3 p; _
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;& W+ m/ }  h$ S6 J' o. J4 K' N( b# W
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    . e, ]  N( Q/ v  }1 O; K' z5 |
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    + c6 e$ W: f) s5 t- J
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    1 g4 x) F* |* W4 S3 R# U$ Y
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    7 J$ X5 R/ Z. N) _- q5 x
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    ) v) E0 m. Y4 V2 ~8 v% L4 d! w
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    % o1 z! b  z! s
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    2 k% w" J1 o. Z. y: G7 I
  64.   end;$ H) g3 `# G6 f0 C

  65. 4 y6 @1 ]) \; T; z' V: S
  66. {  IAudioMeterInformation = interface(IUnknown)
    ! d( K! B, {2 T+ D/ S$ ]  {6 t; R
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']; r1 K5 U; }0 x5 f
  68.   end;}% b" C. }; T6 d- A

  69. ' ]3 J1 o- Q7 b: Q4 Y! L  d
  70.   IPropertyStore = interface(IUnknown)
    $ u( x/ }% \. M, v
  71.   end;
    7 n2 z, R  o/ U9 B, m

  72. 7 C1 L9 ]# ]6 m& X5 G) {( k) `
  73. type
    4 Z3 P! {1 G$ B9 X, b0 |* K
  74.   IMMDevice = interface(IUnknown)
    + h& q  h- |& o. T3 a* p
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']0 W: Q& e& Z0 |! h
  76.     Function Activate(  refId :TGUID;
    2 a/ C+ p2 I$ w+ Z6 `) [# y9 V7 f! k
  77.                         dwClsCtx: DWORD;
    ' y- d9 _5 c. H' @6 w( {
  78.                         pActivationParams: PInteger ;
    3 V4 W$ |9 a* g7 b7 @; E: ]
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;1 P! b1 d# S  t+ k* [. {' _& ~
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    5 a5 c" @+ N  c) a  X" b
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    & l, P' n; r% g
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    + x- c4 ^: k! }# m/ }$ O

  83. 7 f8 t$ U$ j( e/ F
  84.   end;. `8 n' C$ R: n7 T& P5 G
  85. ' d0 w# s5 b0 Q) l

  86. , R9 ?& m) G4 K" _, H) J
  87.   IMMDeviceCollection = interface(IUnknown)1 L# l* |+ T3 [' L* s
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']7 o! n7 s4 o2 _1 A- Y7 @
  89.   end;
    ( }! C& W' O5 _0 j! S9 {3 ^, \) f
  90. % C9 n( f+ z' ^' h
  91.   IMMNotificationClient = interface (IUnknown)" y4 T+ W/ k  O$ S; z- c1 m
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    4 Y3 G, s% k3 z5 I1 S
  93.   end;
    0 L6 {. S; W3 l  p/ k; K- [
  94. ; D  |9 K4 b6 J3 Z8 a1 x" \6 g; h" ~
  95.   IMMDeviceEnumerator = interface(IUnknown)3 H5 x( r' [2 U* Q
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']+ Z+ O; K! Q) w- U2 G" q% e
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;# U2 C9 @( e" h3 V- i
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    6 f& X& k% q4 L/ i" y2 f( j
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    / }2 w& \/ T* N$ z2 a; ^
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    3 L1 N! ~" r2 w$ f7 j
  101.   end;
    ) e! }* Q; _2 R& C
  102. 0 j3 O( e( Y; u4 L( k! Q
  103.   implementation, Q9 N4 l1 ^  k" V3 q0 q
  104. end.7 b" F4 J, d& N

  105. 8 n. l$ s: c8 U; E. L
  106. Thanks & Reagrds,( @( Z  u1 C$ K8 S- |
  107. Mukta ...
    & l$ M; y5 j8 X) y
复制代码

  1.   _6 A) d; X% u
  2. it's work in Delphi 7
    2 h9 D6 N# a: H  H2 F' b4 O
  3. //////////////////////////
    1 v. `2 @2 O0 {% Q1 h& `9 U7 P9 ~5 a

  4. 6 A2 |1 ^9 ~2 }( \
  5. unit MMDevApi;
    1 k& {1 `. R5 e' o  o" c: E2 N( t
  6. + x  }# [# `2 f
  7. interface9 i1 O: g" k6 c

  8. ! _0 {! a3 R5 N, |$ R% N! B8 u
  9. uses
    ; w6 O. c! h/ f8 X- D2 B/ n
  10.   Windows, ActiveX, ComObj;! ~6 |& U7 B. j, Q7 ~
  11. / B0 Z/ k5 k( e4 g5 K
  12. const+ j* J7 ?, }) T( R& ?* B+ s
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';/ S" r& p( d3 g/ o
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';7 C8 t$ R# _/ @: i* O$ w& f: M3 B
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    : m! Z5 s; s7 m  @5 L) C2 k( X
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    0 {& G3 D" N. o' k
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';" v- d' X7 `" n; x( N
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    5 \, p4 m! ~  Y' E! o2 M" I1 U# F
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';+ F3 K2 L1 N" Q2 [
  20. 4 Y  s4 A! b6 f  i
  21.   DEVICE_STATE_ACTIVE                   = $00000001;! t$ u# s3 g/ D: E
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    6 `9 d( G" L, U% b$ ?7 S1 R
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;# t4 I4 u& m  R
  24.   DEVICE_STATEMASK_ALL                  = $00000007;8 V9 J) E( }5 J3 H  h- R+ Q: o$ r

  25. 3 l" Z. P; L7 J& G$ i; E
  26. type7 D. j. T6 |( k. H4 o! H
  27.   EDataFlow = TOleEnum;; C/ p  V: h8 ~" v& g: I

  28. 4 J9 J$ e3 P9 z
  29. const1 O+ V6 s9 a4 x& T9 p) f6 _
  30.   eRender                               = $00000000;! o0 n) m& T& ]9 r
  31.   eCapture                              = $00000001;, ^) D3 \, g: e/ u, Z8 |5 y% v
  32.   eAll                                  = $00000002;
    9 f$ N4 w& V4 d1 o, P
  33.   EDataFlow_enum_count                  = $00000003;3 {3 I5 C& y9 [( E+ u) q

  34. ( r" F! E* i  N% z3 E1 i$ `( `
  35. type
    - y, o# K, |9 H$ c& P% h
  36.   ERole = TOleEnum;! k' t0 w& A8 M0 v* E

  37. 0 ~/ Z8 i+ \- o" w& m) `3 S0 I6 @
  38. const* A$ l5 |* _9 M  {
  39.   eConsole                              = $00000000;
    " N; i! R# @4 }- X6 T0 q# H
  40.   eMultimedia                           = $00000001;
    - ?# j; T3 f+ x" L4 P* N$ Z
  41.   eCommunications                       = $00000002;  @& t: l: V) M
  42.   ERole_enum_count                      = $00000003;( L5 {5 i" t% j( M
  43.   L4 V. b4 y" C0 p* a
  44. type/ n& r. Y/ D3 j( O$ t* c3 H* v2 ?2 {1 q
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    : J& z5 X6 M! r
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    * }+ A( c. a' a$ z, [
  47.   end;
    5 u3 ?# r% |0 i# N1 Z; Y! x& i

  48. . f6 a! Z5 t1 u7 o# `
  49.   IAudioEndpointVolume = interface(IUnknown)
    1 V# W5 m# T, w9 x1 M2 `
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']/ C' ~9 j8 H7 U
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    4 F3 r5 P- t- B$ n
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    4 J; b6 U" k2 b' c; N
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    % L# p9 v$ v/ r& C1 U) z( u
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;; I# Z# j# E6 ], T8 e  d
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;( s: }3 [- B; N
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;1 W& \' L% j# F: W4 d) w
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;* w; z0 t$ R7 x( K# I8 ~7 A
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;, X3 {0 U: y0 ?0 Y( C4 C
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;* ?$ ~  r% g9 j7 R/ q) R
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;" j" R; _4 X2 {  ]) h: _  Q
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;; a" k8 u. g" A! X* G
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    8 |6 O; a+ P- K  ^1 S  h/ u
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    ! ^- [, b8 V/ Q
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;, Y! q* @$ p( f# ?( N+ H
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    9 m$ g& i$ a. O& K
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    2 w- J0 z# l' a4 j' L* A! \. s% ~
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    2 ?9 X! F% \5 ?' l% y3 _6 E+ D
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    1 v7 ~2 r5 h6 H5 y* V
  69.   end;6 W3 {% L/ Y  \" I5 p
  70. , S+ b( u/ _( R" l6 |
  71.   IAudioMeterInformation = interface(IUnknown)
    ( c4 X; j" b. C. g4 D
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}'], h* }, j/ S$ H: h" v7 p, P
  73.   end;) Y) y2 s8 |1 G; H6 a5 z

  74. - Y. F# d: }3 O. Y& P# p. X. f5 A
  75.   IPropertyStore = interface(IUnknown)
    * j' Z- Q% u5 Z* j$ Y% j
  76.   end;5 i6 @$ q8 L5 X1 t

  77. ; S, _/ o% s6 y# ^; U# I4 c
  78.   IMMDevice = interface(IUnknown)1 G+ y' c' k( {/ ?9 I7 H* V4 ~# A* x
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    7 w4 y8 w) H" w. Y
  80.     function Activate(const refId: TGUID;
    , g+ g3 j# Z. {  l3 R6 ]
  81.                       dwClsCtx: DWORD;
    ( T8 J& W1 J# _
  82.                       pActivationParams: PInteger;
    ' a, `# @5 s. Z( b% o0 R5 F
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    ! X- v1 y' k) k: b( {4 d" P. T
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    / I' b0 ]& I  e3 e
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    - c8 p: j' F3 z0 ]6 S
  86.     function GetState(out State: Integer): Hresult; stdcall;+ p+ M6 X; `8 L/ C
  87.   end;
    : j  q' i1 e5 d4 u8 |5 B; q

  88. * V5 F* H, z0 m- ?6 }) i4 w

  89. ( w- x# ]3 e4 h+ e( @/ E! b
  90.   IMMDeviceCollection = interface(IUnknown)& F( u# t" M$ ?
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']3 Y. I- N- e2 k6 ~; g- @
  92.   end;
      {7 Y7 U0 i6 i6 ]+ t& [" s
  93. % g5 A8 s8 f! ?0 ]) A
  94.   IMMNotificationClient = interface(IUnknown)5 W/ k  c2 ?& h" T% I1 v; I$ U/ A& C
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']1 @2 w' m3 D* \- b! J
  96.   end;
    ' e3 ?, W* n- w* y2 P6 d
  97. , |$ H( U8 ]# l; c. J* e/ k
  98.   IMMDeviceEnumerator = interface(IUnknown)* I( H7 H3 _$ v0 I* b( Z# G
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    7 h& U0 f) l- i& ^
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    , f5 D0 A* c- K  R$ ?! q# N
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    + Q# O+ R0 C5 }) ~4 u' ^
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;& ?/ Q" \* P: \* @6 ]5 w
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;  J! @, R/ u; L4 k2 F. {9 r. _
  104.   end;
    2 j  E  f8 P9 P9 D" m
  105. 2 D: c, a5 s* S0 I' P
  106. implementation
    2 f+ J" Q& ^; R8 K& U
  107. % u2 y, l* y% `( n' i. u
  108. end.7 o: |: Q' g0 l' i( [- L
  109. # T8 q: g; `: D
  110. ///////////////////////9 \$ v+ J# R4 |  o( e
  111. simple sample :)
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  112. ///////////////////////' H1 R' J2 w, I" l3 K, t
  113. " \# e4 c% Y4 }9 J0 p
  114. //...... other code$ w: o8 w8 p! Z2 n+ A

  115. 7 ]7 g* f) v+ w7 \. ?* o' g
  116. uses ... ActiveX, MMDevApi, ...;
    # Z8 X- v- l) S7 X
  117. ( P. \7 ]& @6 P, c' T* _' e
  118. //...... other code; K3 K) M  k; v' P8 Y

  119. 0 }( g! C/ v$ ^# S2 \
  120. var# j0 u* L% f8 r, g  ~! M+ b
  121.   endpointVolume: IAudioEndpointVolume = nil;" a! p6 E! x4 _# D

  122. 7 G7 z5 r9 M5 o0 F  {+ @" M/ D
  123. procedure TForm1.FormCreate(Sender: TObject);' B, [" l( f( J5 O) a
  124. var
    ) c( ?* v! D7 p7 }' Q- l
  125.   deviceEnumerator: IMMDeviceEnumerator;
      O# t9 Z8 h& E4 |8 N
  126.   defaultDevice: IMMDevice;
    / k! f. `& v6 I' T) o, C) e
  127. begin# d+ X& ]. _2 e9 N' J
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);  U8 I. d  Y7 K3 {
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
    % Q" A$ U- Z/ t2 e
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
    ) U! ~" M1 C' S) F: v% h* m& v6 g
  131. end;
    8 O  u- _, J% O$ `4 L
  132.   R0 Z6 P0 k9 S. r/ [
  133. procedure TForm1.Button1Click(Sender: TObject);2 o2 @8 r, Z$ b( I4 L/ n
  134. var8 T6 C; t9 U9 @: z( {. T& ]
  135.   VolumeLevel: Single;
    . n4 Z1 o7 Q, [6 g
  136. begin8 k" t' |& ?( t  ]$ v* {$ R; I8 E
  137.   if endpointVolume = nil then Exit;. c2 o) o( Q! Y2 I1 {  g: E7 X7 w
  138.   VolumeLevel := 0.50;
    2 d! W+ b4 M. x' |4 R+ w
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);- X7 T' a" {  _  b
  140.   Caption := Format('%1.8f', [VolumeLevel])
    ) B6 x) d) q3 m7 e: e5 c  k) v: ]
  141. end;
    / @! w* R) G8 c$ F- N

  142. 7 V, G0 s; m. i& z
  143. /////////////////////////////////////; m* f& G( N! T

  144. 7 Q( `) O' X/ U& z$ |
  145. // with best regards ToxicDream
    4 x& Q- w' k2 |0 d
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