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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
  ?% \1 R" O9 N+ t' fBy Mukta & ToxicDream
  1. ) a9 `$ E1 ], ?
  2. //for delphi 59 h/ T  W( P) t) v4 n
  3. unit MMDevApi_tlb;0 `/ O) S! _9 F1 J& o9 E

  4. 8 T; m5 l/ q. }/ c6 _0 G5 _7 g$ ]- c, d
  5. interface
    $ P9 f9 W1 L/ Z5 p( }+ ]
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    ! J+ J  a$ }' B
  7. const# o  V3 G/ X' }2 @2 s
  8.   // TypeLibrary Major and minor versions
    7 A6 L+ f* x5 w3 j0 O3 ~
  9. ! x2 r8 Y; }: g+ ]9 D: B9 i% H
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    ; {# [! G+ P+ O/ Q
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';; O8 c) c) o3 O5 U) A* B6 i
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    7 N) R5 x# Q% L- T9 B2 ]
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';7 I) j' ?6 D$ X
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    ! m" O1 v" ~5 F. X- @/ R! V; E
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    / x0 M1 W* S6 Y+ R/ f
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    5 {3 g+ @# K& A) I, E: t9 l$ v. C
  17. - [$ P, D# m: G1 W4 C1 W# D" K% ^! X4 n
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    # P& D; r- ], A% \5 T
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;* _( ~4 W  G8 ~
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;, ^3 \- S" k; H6 V; M; Y' ]
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    * Y/ r8 {6 N+ {4 z$ {

  22. : ~+ u* u- X& ^! s5 d* M
  23. type* }/ u+ X, i) `7 r1 M
  24.   EDataFlow = TOleEnum;
    5 a) {6 T" A* |7 h
  25. const8 [2 u  d7 U) l# o. M
  26.   eRender                               = $00000000;
    ; i# V$ O3 c/ K" n5 \4 ]
  27.   eCapture                              = $00000001;! A+ W3 Q' {- r; K0 i2 q+ h% E& a
  28.   eAll                                  = $00000002;
    / C" R! v# [* D
  29.   EDataFlow_enum_count                  = $00000003;
    6 k9 Z9 w, w$ Z  k

  30. # d% U; T4 z) E
  31. type
    4 r" v7 R$ N% C, Z
  32.   ERole = TOleEnum;: o/ p# ?( q, q
  33. const
    " Q1 o# a3 ~  X; [- `
  34.   eConsole                              = $00000000;
    6 h! A: K* _3 k
  35.   eMultimedia                           = $00000001;# `7 Y- h& `: X
  36.   eCommunications                       = $00000002;8 D/ f, o# A- E  [+ S
  37.   ERole_enum_count                      = $00000003;% |# D; T+ q1 {: n

  38. ' D* z1 l- ~  @9 o
  39. type' r7 S+ `* D! o; ]: j6 j3 _
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)( f% q/ n2 T' A" [0 J) ~
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']# N  O) Q" M# S: R
  42.   end;8 T5 B' d5 c8 O$ }" L/ n) ?
  43. + P# l1 Q2 |* p7 T
  44.   IMMAudioEndpointVolume = interface(IUnknown)7 F& E; X" B/ X, a* c" H
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
      p: P% }2 M) y: |
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;4 ?* N* x- F* u
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;/ Q  o' n, K( A# }8 L$ P! x  H
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    ' s* n& u. |/ L9 V8 j
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;" w0 _% i1 ~( t* M- J$ e
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ( K5 ~+ r. B) E) |7 h+ T  r) W9 X$ p
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;$ a& G! n  |7 f4 H- N
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    9 D4 l4 M; r# E& m
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    , x3 Z1 M& m8 [% {7 ~  n
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    $ \* q6 X0 q9 s
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;) h( \* Z6 g/ J  I# D0 h" M; M
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    3 y7 F2 i# H- f& F: F* l! z
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    3 K: I& p; P* ^  K0 Y) F# ~: ^2 i
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    $ Z8 q$ M6 G% z$ E; J( i! Z% I
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    ' U- h& I1 s" P  O, o. |; s
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;7 K5 j* K( T7 i) N: b! \( k$ q
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;- ]1 N' u2 d$ K' u/ E5 F
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    % f9 ^+ V6 z9 @7 v4 N8 [3 z2 A7 d
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    3 M4 a$ c) H4 |( G0 K2 U0 H
  64.   end;" {- P3 I, f1 o  t5 G, K, q( m

  65. 0 X. b, |3 I5 W$ b0 [- b% x6 ?
  66. {  IAudioMeterInformation = interface(IUnknown)
    7 m- V; l2 E) ?0 M3 X0 O$ l/ g. s
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    0 R( c- L) V8 Z2 {) u4 \8 [
  68.   end;}4 r) Q* a1 Z4 y) w. ?3 U9 U
  69. % i( @5 F; C( c3 @! i
  70.   IPropertyStore = interface(IUnknown)  l: e8 t9 A, [
  71.   end;
    ' [2 k% x: P# ?2 y3 a+ N
  72. . D' i3 \0 Y6 _/ k3 S
  73. type
    . r9 h+ F  T2 T
  74.   IMMDevice = interface(IUnknown)
    % B: x. }  G0 s; ~! f: R
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']4 W- o% C1 H$ A5 s
  76.     Function Activate(  refId :TGUID;
      ~# `1 P" q+ b/ m. r4 C  O
  77.                         dwClsCtx: DWORD;
    / y! P  ^. b" r2 ^# B8 s
  78.                         pActivationParams: PInteger ;  ~" @7 m, F8 }2 h4 b
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
      O! w* \. B, Z( n- r) `
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    ! g6 x8 m( ^3 X, @1 }
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    8 n9 m0 m" W: k( ~- o
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    1 w1 K$ {9 d8 U( N% |) i

  83. ' C# O. \+ K: b
  84.   end;
    9 A7 J. [( d* d- f% R. e

  85. - D) l/ i% J. D2 J
  86. # A, W  B% }3 A. f1 ]- |+ i2 e  Y
  87.   IMMDeviceCollection = interface(IUnknown)
      o4 U# w- p% u5 ]
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']6 h+ B) W1 w9 E; l$ J
  89.   end;
    ) t( F4 k# X& \7 o2 [4 Z
  90. % g: r& o8 n5 @
  91.   IMMNotificationClient = interface (IUnknown)4 b/ H+ G; u0 q/ {0 |
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']" {( h  p  m" t0 c
  93.   end;
    + J- U* U; `8 L' ~9 A

  94. ' I! r& |2 B/ p- t9 V
  95.   IMMDeviceEnumerator = interface(IUnknown)
    % I# W- r: d. A. r- L6 l* H; K
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    . {: t5 e# d* d1 j" T; j( M, l% {
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;2 P/ m+ t3 I9 J9 |
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;1 Y) n- P7 L3 b; O# }, V
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    % `: L9 L: z' r0 w2 g
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    - y" U# v3 H* g! L, N
  101.   end;
    5 W. f/ B( P* w  u) L

  102. ' Z+ r, R/ L3 D8 h! ^
  103.   implementation7 B" n0 ?* e: P* J
  104. end.: c( o9 h. i$ D$ q7 D9 k
  105. 7 t3 _" e; {$ R+ o2 |8 x
  106. Thanks & Reagrds,
    0 B4 L; O/ \# Z/ \" }1 b9 ~
  107. Mukta ...
    6 f! a! }8 b+ y: P2 y9 S; F/ x
复制代码

  1. 2 z9 P! Y! ~# t  k
  2. it's work in Delphi 75 I7 \- Y  |* N$ |8 O* E3 j6 \
  3. //////////////////////////
    - X& s$ W9 H) c) R! F% ?
  4. / o& w/ B% E( E/ j0 o. x
  5. unit MMDevApi;1 }8 v' ?& S# _+ l4 W. l7 {" i

  6. $ ~0 {! b, s3 ^  \8 U" W/ M# e! `
  7. interface* B4 _3 {& D, u6 M/ C
  8. 8 c4 w. j6 j8 c: w! Q, S; C7 x! d
  9. uses
    6 p% \* n) N8 p' D* g8 v. `. z! o
  10.   Windows, ActiveX, ComObj;5 i* ]. ~5 T: I; J& Y  p' t  F

  11. $ d5 u% [2 u' J/ I) O5 {8 f3 k
  12. const. P; Q' j' r7 y+ w3 ~8 ~3 @6 J( J
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    + n# B. Q5 h, q" s/ u
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    $ m- u& M' c0 r
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';& ^2 v0 Z  S, X
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ( {1 H% j. u$ v% `6 N1 A: ?! }
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';; H" I: H$ T. [: a
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    0 z9 T% |8 `( I6 k
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    8 P0 g. V: u. b. R

  20. 7 q/ V! ]4 s, G. [5 \- Y; D% e
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    0 X  d+ t) ^" M
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    0 }% a' Z1 s( m6 N4 x; }
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    7 ]. K+ M5 k3 P. L& R
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
      H' k; k4 X! p4 N9 A& D

  25. - @3 n0 J- u# e3 E
  26. type. P( G) m  {2 c$ Y
  27.   EDataFlow = TOleEnum;
    4 z- F/ m9 @6 m0 j2 }4 u% E* x9 P  E

  28. # t  k8 b4 ], I3 p% `& S
  29. const
    % U: [# r, `" o6 M* i! L
  30.   eRender                               = $00000000;
    6 H7 B5 u6 l) E
  31.   eCapture                              = $00000001;. h' V! N$ W+ d
  32.   eAll                                  = $00000002;$ x5 u3 P8 h: ]0 ]
  33.   EDataFlow_enum_count                  = $00000003;4 L5 {  L5 ?3 ?9 s% s
  34. % W7 L5 ?" ]; a$ ^
  35. type
    2 Y; b9 G- A0 I* L
  36.   ERole = TOleEnum;- a# X$ g/ K  V2 B& k& i

  37. ! N+ O- H( f7 _7 E% i; m" F! A* Q
  38. const4 l" t+ ?: c# ?; v+ e; c, v
  39.   eConsole                              = $00000000;
      p4 e: [7 D  f! F2 u# W
  40.   eMultimedia                           = $00000001;1 Q+ g- Q) }+ I* c4 u; Q" k$ S5 {, G
  41.   eCommunications                       = $00000002;9 l$ [, v) u# P( F( L
  42.   ERole_enum_count                      = $00000003;
    1 I) w9 i3 O; @6 y+ g

  43. " ^0 g% [+ H; P/ f& M+ e! g
  44. type6 I  h6 H) L+ |* L& T# s3 F
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    , A* Z9 ?, y6 ]; s* I1 A8 |
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']5 T3 l7 ~7 ]7 Y7 s% ?- b: J
  47.   end;' A6 u- |# |! F* C, r% t" w; o2 P8 ]

  48. 6 g9 b8 m2 n# c
  49.   IAudioEndpointVolume = interface(IUnknown)
    ( }  z8 i. f8 m& \0 W
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']7 Z* F! |. a8 }+ I  c, L( T
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;0 q! S& h7 o  l; r( J
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;* O  q  G$ p% Z& S
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    ( c) [( F6 @5 {; I
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    7 d5 J' q, R% g: x7 N
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;5 G* U( a" V" R' ]  t  R
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;8 Q7 p1 T, _7 \3 G# L4 V
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    ; m# f5 ~2 r' ~9 k+ n) Q$ D
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;1 Q7 j" y; r  R( j
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ! {% @  E$ ?7 _( n" i+ Y6 H* R  b
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    9 E; d; x+ U- v+ P6 _
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    # Q9 F: i( S% p
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    . i+ B7 e* M; v: K* G9 z+ y
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    $ k* J3 d. @' D3 a, {
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    , U! b7 i) n! X* i& J3 ]
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    , {1 R" i7 t" Z9 A
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;6 l% ~' N9 P8 ?+ o
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;$ h! R, I1 }/ |9 Y4 r
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    0 [- S3 e1 _; e+ A8 c5 b2 b
  69.   end;
    , \, Y" C; n5 I) a. a# H
  70. 2 Z: B8 u! I. ?8 [
  71.   IAudioMeterInformation = interface(IUnknown)
    ( ~  y/ Z1 o4 _
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']4 _) {& [+ v1 J! c0 G( C
  73.   end;; i4 _9 E2 n% p
  74. 7 E8 P7 ~/ i- j
  75.   IPropertyStore = interface(IUnknown)
    0 a3 L/ e2 C7 w9 t  B6 z
  76.   end;& R) `3 t, J) q+ Q7 U: l$ }
  77. / ~1 R& b7 E3 a# K
  78.   IMMDevice = interface(IUnknown)
    $ d  ?- z/ B; B+ p, N+ r6 m' t
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']  r6 l7 i8 K5 C$ \3 t
  80.     function Activate(const refId: TGUID;
    6 g; |. w) `! _% n8 z5 U& C
  81.                       dwClsCtx: DWORD;) Q' e. M/ F9 |9 s- u9 p
  82.                       pActivationParams: PInteger;
    1 o8 J1 U* z( S
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;7 ]! x( m' F+ X0 }
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    + y& k2 H+ M1 ^# B" B  ]7 k
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    / U1 x6 x  |' r$ ~
  86.     function GetState(out State: Integer): Hresult; stdcall;$ n" k0 G" z$ [: }$ n
  87.   end;; o2 B5 x! ^  d* W9 y# I

  88. ! Z; y: G  y+ C2 @" e

  89. : ~7 ?+ K+ z) ]  V) U
  90.   IMMDeviceCollection = interface(IUnknown)
    9 I: O% e0 e  H) `
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']7 b( T, Y7 S" V: [$ S0 R( n* X
  92.   end;3 `+ e% P  q* j4 C0 k, s

  93. - |  o$ D0 S( g5 B
  94.   IMMNotificationClient = interface(IUnknown)
    ; R# L( E. ]7 F& H1 y- n
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    * a3 `/ T% D6 L, l- E' h
  96.   end;4 e$ c+ d" m8 j5 ]. K

  97. " D& v! |4 b4 i: M
  98.   IMMDeviceEnumerator = interface(IUnknown)
    $ {0 o9 n" F! C
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    / x+ S. A* M# x& j' J" I. f
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;0 }: b& r5 I) M% n3 a
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    7 Z. G, W* K. \/ |7 y
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    ) ~* w$ v3 y& ~6 \2 F6 Z
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;0 c; u' k( h4 D0 C3 w7 @5 v9 w
  104.   end;6 M: }- K; r4 F! \
  105. 0 r/ ^" j3 c8 u6 e& F( J: c
  106. implementation# I% }. n6 x  w+ p

  107. 4 G, \* ]! d3 a( {. f/ Z5 e; @) O
  108. end.
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  109. # s. R) V- l" [
  110. ///////////////////////
    ( z0 {  R  O3 n
  111. simple sample :)
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  112. ///////////////////////
    ( h; _# u. P4 \% b
  113.   W. `# @5 D' `: @) G/ @$ o
  114. //...... other code+ `( M+ [: M5 C. h$ K; S1 `' q
  115. 2 H+ H+ }, j( R' l9 ^1 v8 k! @
  116. uses ... ActiveX, MMDevApi, ...;: Q% W3 f/ C/ V- H3 R/ P0 o9 ]

  117. # Z0 I! y' V/ ~1 K& B; h  ^
  118. //...... other code/ U, M  C' ?% H6 M* h# Z
  119. & ~, {" X3 n+ e0 D. s8 P9 h6 k2 Y
  120. var4 Q8 C  D! V, p
  121.   endpointVolume: IAudioEndpointVolume = nil;' H8 R) b4 @8 s, y2 k

  122. ( n+ K7 y! H  ~* v, {* |
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var6 F8 H& J1 X- }. }* e- n0 I
  125.   deviceEnumerator: IMMDeviceEnumerator;1 F6 d& C6 U7 A2 w9 J
  126.   defaultDevice: IMMDevice;$ l% w/ O! q. A/ {
  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);) l9 Y, S( w" g3 G
  131. end;6 a& z3 Z1 s/ K
  132. , ^0 n7 j3 H, X. X" z
  133. procedure TForm1.Button1Click(Sender: TObject);( P: T2 b( z# u3 J9 ?& {
  134. var
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  135.   VolumeLevel: Single;
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  136. begin
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  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;
    9 H6 N) `' h3 s, b: o
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);) H* z3 {5 _, ~0 L# I
  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
    " Q" I& M8 {1 [2 f

  142. + E& q4 l) V' s. ~7 t) }8 r
  143. /////////////////////////////////////$ v1 x% i. Q! Y
  144. . I1 P; E$ x, w
  145. // with best regards ToxicDream6 ?! R; X7 i) p( s; C3 `2 @/ q
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