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[转载]Vista volume control using delphi 5 & 7

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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# k+ Z( O" G1 J+ t* r" a( B
By Mukta & ToxicDream

  1. 0 {; t7 z/ |* h9 f% ~* e; a% g7 H
  2. //for delphi 5
    9 k  |, ]9 |, `9 ]
  3. unit MMDevApi_tlb;
    , r: p; z. t+ Z$ d

  4. - ^3 W8 w5 c0 _0 O2 Z  M. _
  5. interface
    ! Y$ o8 e2 y9 u" C9 a4 ]
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    , ?  }0 i# G7 T/ B1 w
  7. const
    ! n: g* `, C9 S, o, P
  8.   // TypeLibrary Major and minor versions" k3 o/ \9 o9 S  F  H3 S6 [

  9. $ C4 R  P9 t7 S1 t/ F" w
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';# i1 [% i2 R- s4 @- Q
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';2 I: J; @: `" M9 @* H' v5 Q
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    $ Z! ~) ~8 O0 F  e0 b# q
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    % p, A1 }$ F2 V% K1 \& S
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';, u1 W9 }$ c" }: n' V
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    2 o& W5 s' `! P) W5 G
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';  M7 k: D0 B* D0 d$ q* o
  17. 0 i( |% d9 m! b, w$ `
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    $ L! O& i7 f) z0 r) m
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    0 T' d$ u5 G/ G7 {) S7 `8 }
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;6 E$ O  [! u& e3 Z3 x$ i* O
  21.   DEVICE_STATEMASK_ALL                  = $00000007;, D, k1 T$ }3 r1 k9 W
  22. 7 M* l9 f( X0 y1 j6 I1 b
  23. type
    $ V" s8 g# B! H, [
  24.   EDataFlow = TOleEnum;" h- }0 E8 y+ s  V
  25. const
    ! c- W/ C9 b9 o1 \, e. V7 u
  26.   eRender                               = $00000000;" \3 ^0 F$ [% i! B9 J8 N+ I
  27.   eCapture                              = $00000001;8 C9 O$ g6 O/ d8 r
  28.   eAll                                  = $00000002;
    & m# A) W% `6 g
  29.   EDataFlow_enum_count                  = $00000003;
    2 j- m' h# B  _! C7 }, S

  30. , U# l6 {* Z4 e6 t3 y. b. @
  31. type8 b6 X6 o* `7 i; i
  32.   ERole = TOleEnum;
    + p$ X, \5 l" @
  33. const
    2 D! e6 `, w: u# u0 M% M  U
  34.   eConsole                              = $00000000;4 g9 K& H$ R9 @& i( G
  35.   eMultimedia                           = $00000001;! G0 d6 k, o6 `# [3 `3 Z
  36.   eCommunications                       = $00000002;
    . q8 q( Q3 H; ~: O0 K- k- S
  37.   ERole_enum_count                      = $00000003;
    1 l5 K6 D$ _) E$ T8 U/ M, e1 W& W
  38. : @* C- v; m" J1 l( X
  39. type
    ! v+ I4 e* p) K) V+ r3 U  S
  40.   IAudioEndpointVolumeCallback = interface(IUnknown): a) f& k$ p) ?/ j( Y8 s
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    - {, [+ I2 s. i" J0 q
  42.   end;
    . T: e& L7 J+ o2 _& F5 w9 p
  43. . V& {# V9 `7 D
  44.   IMMAudioEndpointVolume = interface(IUnknown)$ [5 l  q( h/ u% ^$ l# a; l
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    & p0 i% l# c. u1 p) _
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;% ^8 }& K* u& O4 c
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;  |2 ]8 _! [( b. K9 h" r
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    2 d( s0 L: M5 Z
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;6 }( b7 b( s) ^0 L2 ~
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
      a; L& |5 {+ Y  [% N2 s/ W
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    : |8 J- m  ]" ^7 B
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    1 }! w# g. H: u
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;; a+ r# L! }4 A- f& ~
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    6 @$ G2 q# H0 L2 G) r) u/ u
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    1 i- U* @- K5 E# B1 S7 ~! o6 _& z
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;" f- s, R& ~" N" Q
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    9 _4 f. V$ @1 ~. [, E
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;8 E$ U7 n' W% ^$ c4 }7 V6 @# o* n
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;5 |4 D  o9 e; K. _
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;6 _0 r1 K/ k* I- ^* z6 R3 {
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    4 e4 [) ]' c% `5 |
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    / K. K8 v3 C0 c2 R+ X! G+ \# {
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;6 o+ z/ I# ~- J) b! J* n
  64.   end;! k  E) q# N5 L/ ^5 s

  65. " r" a) M' G. M; [3 D/ [" q
  66. {  IAudioMeterInformation = interface(IUnknown)
    5 Z* J! f! O! n$ F3 u0 a* M
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']3 z: ?/ ^+ }* g8 z$ }. R) \- X
  68.   end;}
    ! C5 g7 L% y& ?/ t

  69. ) f, f4 `- ?" U
  70.   IPropertyStore = interface(IUnknown)  _; n  s/ e* C& d: W+ _
  71.   end;
    , V4 `6 Q5 K# _6 A$ v4 s' P3 a! F

  72. ! q6 G( I) X3 y7 `7 ?) B2 i5 }
  73. type' @* q" z( v( |( s% o/ Z$ }
  74.   IMMDevice = interface(IUnknown)" ]: v' \/ X. \0 I/ M
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']- u6 P5 H+ Q* F5 n1 a+ U# `  v
  76.     Function Activate(  refId :TGUID;
    1 \; s- A) ]) P; F  Y5 ?
  77.                         dwClsCtx: DWORD;6 Z- R( `6 C' X; j7 x
  78.                         pActivationParams: PInteger ;
    ) [* J/ e8 `! n  Q% S
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    & E, h, q& C- e- F2 \8 n; J
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
      {& Z& G2 t: f2 n
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;. `! T9 b& @9 |1 J2 u" I
  82.     Function GetState(out State :Integer): Hresult; stdcall;) R7 D$ b1 W9 R  n3 R6 r+ n
  83. 9 D. F4 H% |# ~  t0 `$ }( S
  84.   end;
    2 e  m3 l, {6 E# q9 `, c- J0 b
  85. # R9 y( |# h0 j' l* r, `2 u
  86. ; h& m2 o8 }, ^- {/ x) y! M
  87.   IMMDeviceCollection = interface(IUnknown)
    / @: }3 A3 F3 Q- U
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']9 E' s7 r: i% \3 m
  89.   end;
    6 n7 c5 V0 W& ?
  90. 1 x% K7 I# T* y
  91.   IMMNotificationClient = interface (IUnknown)
    ; D1 q3 a% R3 W$ A3 A* @" _+ H
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    1 ]8 s0 m0 U* P" x5 F; h
  93.   end;
    2 n7 P$ {! a; a$ X# ~" F

  94. ) O3 ]  b+ b& w1 \% |6 ?3 N
  95.   IMMDeviceEnumerator = interface(IUnknown)
    & u) x; a1 \0 C! g
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']9 _4 ~5 y. l- C. e! x
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;, I) ?! Q6 I8 y; H, n! [# D8 ]
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;' ~; N1 D3 z7 \/ }' v6 X
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    : ?6 Z3 n, J7 z, x: Z8 F' F" J
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    % _; t0 p, }! n! v7 g
  101.   end;; S  Z) H$ c- C8 v

  102. - {) x, M, M- t* A3 G
  103.   implementation! g# [3 z& W& c* Z
  104. end.
    , g5 O4 W6 Z$ b% E3 V6 L( d! ~
  105. $ L1 H. ~+ P3 o3 `1 r' a$ U1 Z
  106. Thanks & Reagrds,+ d1 q4 D3 R) t' r% y! l9 ?4 V
  107. Mukta ...& y! f4 w. [1 p! Z) s
复制代码
  1. , v% @: W' T$ R  E8 `! `$ q( A
  2. it's work in Delphi 7  q2 ?) h/ g2 E+ g- q4 b9 X% O
  3. //////////////////////////
    " ^- l( J; R2 S
  4. & E( R0 X1 c$ M! m6 F1 m1 x
  5. unit MMDevApi;
    2 L7 w% |8 {. o8 [9 p
  6. # Y! A1 A: {! e* _4 l( N; H
  7. interface
    8 u4 U( j, J# d+ j' t8 y

  8. 4 n1 R+ F5 b' n3 P/ Z& o
  9. uses
    " Z! N+ ?- H% G4 ?0 X  H2 E
  10.   Windows, ActiveX, ComObj;! L" i0 s, D1 P/ b

  11. : z! E# t- A! l$ w  c
  12. const
    2 ]! |* A: }* o+ K' K+ T0 Q
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';' g2 K9 }6 r7 H$ ?
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    / p  t! Z8 ^9 h; l
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';' x4 s- ]+ }6 X* f4 w
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ; _4 C' m3 }, n
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    * H# s' Y1 \$ E& ]( ?8 ~+ L
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';; i3 j$ m$ ]7 O7 l
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    * I8 ]: H! O( z6 H% q! q

  20. " C# h4 k; n" j1 }$ i/ B' _
  21.   DEVICE_STATE_ACTIVE                   = $00000001;7 \* _( o; z$ L* H( G+ M
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;3 G' U: e& B  J  ]) \, Y. c4 u( p
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    * l3 @/ [5 M% ^8 t! R. u) t8 q4 o( V5 s
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    ; R" P& Z* T# ]; v  ?, T* J- X
  25. , q% {( ?: t5 ^1 ^) p
  26. type
    1 C# }3 {: b6 P' W
  27.   EDataFlow = TOleEnum;
      P$ _* O, m# m1 V& p3 h9 [

  28. ' I% F7 V% J/ Y( K: J
  29. const
    ; D) |+ }# \/ v8 \/ d& Y# P; `
  30.   eRender                               = $00000000;# L: p: s5 X) _* a! u  j2 l
  31.   eCapture                              = $00000001;
    ) h6 O& f" j8 e/ N. Q& z% ], S
  32.   eAll                                  = $00000002;
    8 y8 ?! l& E' e) i/ W* r& }
  33.   EDataFlow_enum_count                  = $00000003;8 }4 k( Z  @5 P$ X1 ^7 P

  34. ! N  c' W, e0 \! s- L' {3 M
  35. type
    + z$ ]4 h; R9 l  |, @" q# J9 I+ m
  36.   ERole = TOleEnum;
    9 p; m# }' q$ n+ J. v) }6 t) L

  37. 5 V; M) K: Z+ Y. V& R
  38. const
    0 L9 S& g9 f. o7 U2 X
  39.   eConsole                              = $00000000;# M8 w. n' t; f
  40.   eMultimedia                           = $00000001;" T; x/ L& x: @- I+ K3 P
  41.   eCommunications                       = $00000002;8 s- Y6 k5 a: N3 T) e" ^, h1 `/ i
  42.   ERole_enum_count                      = $00000003;
    7 a6 [3 ?( u- {$ E

  43. 4 @; D! N. K, ^- M& @: }0 o0 F: C
  44. type6 n, h9 Z/ f2 o& d& P6 B1 |% I
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    2 g4 e! c( F9 ]9 ~- Y$ M
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']0 X" r5 X7 N* i3 a; l) ~
  47.   end;
    9 X: U0 E  h4 G" U

  48. 7 \' J% u; }! i4 f3 l% \5 {+ e$ A8 g
  49.   IAudioEndpointVolume = interface(IUnknown)
    ( e3 V4 ?5 Q9 c) s, q2 }+ e; O" m
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    # {' z0 ?3 R, l" V! U( |
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    1 ~" c# L" T; D: h7 k, [" }) e
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;2 s' n5 s% k; y# O) b( n
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    * h  v" O- K  _7 c& ]8 D1 Q6 g  v' E
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;1 q- H3 u  Z9 f& G
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;% n5 Q# h/ q4 K& q
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;  Z2 m) {) z4 ^" w7 Q: z) t
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;) Q1 F. V6 F* {. E: J' h  q5 h
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    8 `$ Z- J: y) D0 B, f- J
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    8 t8 K( n  T) r
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;4 n- W# _9 z3 q3 Q0 ?$ p# v) i! F
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;$ h* j0 l) [  _- {. U
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    , c$ l7 _; W5 o3 v9 F; j
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;! v* X+ o( v; G3 @  p# k
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    ; F5 _& c7 O+ H4 z& _# S5 u
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;/ T6 K. Z+ I' n2 j
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    - C0 D/ t0 L' }: M, Y9 X
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;& S& \$ D5 R* ~$ X  h5 F: x
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
      A$ {+ D" s# K7 H5 o
  69.   end;3 x! Q+ ^9 b7 k2 q: A* b

  70. * O& i" m* H9 U" x
  71.   IAudioMeterInformation = interface(IUnknown)
      }, }! z( ]& P( @' H
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']9 _- Q) v2 H% [& l+ a/ _! G
  73.   end;( Y; I* i3 {  S1 T. A5 \- P6 J1 B2 o

  74. 0 P8 x! [8 y8 x) h  P0 ?4 K
  75.   IPropertyStore = interface(IUnknown)3 @, G- r2 I; c
  76.   end;0 [8 n- X% o8 j) Q# N  _7 j

  77. 9 ^% C6 M& Z& l  P6 M
  78.   IMMDevice = interface(IUnknown)
    . w" T+ p$ r/ f, Y! ^) P
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']) w  ]. o7 R. @& u( e' `* J
  80.     function Activate(const refId: TGUID;# n" J- o. a; A' h( z
  81.                       dwClsCtx: DWORD;5 @! x  _  n- q6 W2 t. r9 m
  82.                       pActivationParams: PInteger;
    - g  ^8 T5 P' }2 ~2 u5 |( F
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    ! V+ P% x; p, J( \
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    1 R+ f  D: @; v* H
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;' Z5 u# O" \: F) j% {0 T: \
  86.     function GetState(out State: Integer): Hresult; stdcall;
    $ V3 i( X3 r8 b
  87.   end;
    5 p6 |) T. K" X. f. u* s' x
  88.   t# z6 {- O3 _  @3 V6 t! Y
  89. 3 l0 l+ z# Z+ ]6 d1 k( O
  90.   IMMDeviceCollection = interface(IUnknown)
    ! [! U( _! P" _& f. D8 K
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    * K8 u: e( B$ Q7 [1 _' |4 ^# ?/ F
  92.   end;8 ?6 N: k% T  r

  93. , k$ n( U/ }1 B: y+ m( `, U' U
  94.   IMMNotificationClient = interface(IUnknown); Q$ }$ \8 l! q% i! {' k* i2 S
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']; i( }2 h. Q; \" Z3 d
  96.   end;' ^% _$ `" i) E8 [* c+ }. h  s
  97. $ V: E. O" y9 F4 Q* f) U
  98.   IMMDeviceEnumerator = interface(IUnknown)
    9 K+ Q7 S0 {+ \4 Z' i3 p
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    - e* Z& l! j, Y& a) G- c5 c
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    ( [% t9 p) u5 ^/ h) D
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;( T+ `8 o7 l: K5 @  O* F. T1 t$ e
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    5 ?% ~5 g/ Q+ j. t
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;8 `2 N2 c7 u' t& |, r  R" \7 `
  104.   end;
    1 @, i  W, O0 C1 k) ]4 X% X' T+ y
  105. : g& T. @2 `5 m( H9 Q$ a
  106. implementation
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  107. ( M, M- ~2 \2 {$ l1 m
  108. end.5 D! A' O: Z# i1 ?
  109. 3 h+ G9 [' f" j3 H* G
  110. ///////////////////////! f1 c! z4 u5 {4 ~" u( W9 b* C0 e$ y
  111. simple sample :). t9 W! r% i3 U/ ^6 b7 g+ U, r
  112. ///////////////////////+ Q5 J  q5 G! n+ q2 l
  113. % [& M% E0 V+ w% \$ ?; s
  114. //...... other code0 j6 R; X% v/ d

  115. - w0 V/ l' P1 v; j% h. A
  116. uses ... ActiveX, MMDevApi, ...;* ?- U/ G6 O( I1 R- d8 P

  117. : V. S0 W; A; d
  118. //...... other code
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  119. 7 v. ]$ c1 F, G5 q" S. L' O; ?" B! ]$ {
  120. var
    ( T2 E. P8 i6 O0 b7 l, r/ U7 Q
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. ' Z( d/ {3 N& \: q$ Q
  123. procedure TForm1.FormCreate(Sender: TObject);0 H& h+ H; i$ F. ?# N- W. w. N7 i
  124. var
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  125.   deviceEnumerator: IMMDeviceEnumerator;
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  126.   defaultDevice: IMMDevice;
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  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);
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  131. end;
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  132. 0 Z! k- S( P6 K1 Y3 @, d* q
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var2 v, `8 C: U8 y+ S2 L6 m
  135.   VolumeLevel: Single;# q7 }% e: ~3 o7 c6 y: i
  136. begin
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  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;# X& ~( I# H. Y* H* r3 ?
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
    ! ]" L" b! P5 ?8 ?
  142. 6 }. t) p. Z3 a0 k1 S# q
  143. /////////////////////////////////////+ Y' z# v/ a& _& F6 K% ^

  144. 7 c* Q0 d+ X6 `. X
  145. // with best regards ToxicDream
    * }) w, R1 A: X( I
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