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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
# X# M7 L8 @3 X* C: p$ ~By Mukta & ToxicDream

  1. 8 T* Z; ~& Z: q+ J
  2. //for delphi 50 }( [9 o, J; `* ^
  3. unit MMDevApi_tlb;
    ! O6 X1 R& s3 ^4 y" @# t

  4. + F( [2 w7 y0 w  ^7 E$ O9 C4 ?0 z; t
  5. interface. r/ y% _+ s3 ~; f+ O$ b5 {# @) G
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;8 N0 x# m0 Y$ j- ^& n3 U
  7. const, z2 M4 _' Z/ f6 ?5 F) D
  8.   // TypeLibrary Major and minor versions
    , m% k$ U7 k$ y6 _" r7 {1 X
  9. ) Q0 y7 o# y- g
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    1 h1 A1 ^. d; [
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    7 a6 k( m" `2 c/ l0 e( x- w
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';# z& c2 P; X+ d: L7 v; E% v
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    # E) p0 _7 c/ Q. m4 J
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';8 [0 v6 T! w- h: s) h
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    / n1 T+ _" Z  P7 ?) C2 P5 v, m
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';; r' t$ |6 Y8 G( [

  17. 4 Q/ h! O5 S) M3 E' w
  18.   DEVICE_STATE_ACTIVE                   = $00000001;) Q; E6 m: j2 ^' Y; E9 w: M7 e# b
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    / P, P6 t$ d8 |& [; ~
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    8 a4 v5 D# i/ P; b" N
  21.   DEVICE_STATEMASK_ALL                  = $00000007;- c  [) s. z! m# p0 J( o9 k6 u) l

  22. 6 g; D- ^( E: I, c& s+ C( H
  23. type/ J9 {. o6 A1 m& C7 S5 y
  24.   EDataFlow = TOleEnum;
    : N2 G9 P2 m: X& S; D2 u
  25. const
    , B( s2 t3 \& B) W% b2 ~
  26.   eRender                               = $00000000;
      d% a# V  Q: {7 n9 A' h
  27.   eCapture                              = $00000001;+ u9 S. z9 L7 O" ]9 q6 y2 \
  28.   eAll                                  = $00000002;
    ) ^9 t1 g% F  s
  29.   EDataFlow_enum_count                  = $00000003;+ @. {# }% u& }1 ?6 x
  30. : @3 M" d) S" h- `0 b. `2 h. t
  31. type0 r* @4 b: m) G- r6 U
  32.   ERole = TOleEnum;, h- z3 R0 T  M; r; s& M# E
  33. const7 B! T3 ~6 ]' f; r4 }% l& E: S
  34.   eConsole                              = $00000000;
    % K* u# S! H  E. I  B( J
  35.   eMultimedia                           = $00000001;0 n* I. \  Y! A  O5 [- ?" y' s0 \1 A& Z
  36.   eCommunications                       = $00000002;4 H; r- z; Y+ y& \( S# Y% h5 B
  37.   ERole_enum_count                      = $00000003;- D  t+ U# d+ M5 ]) G3 H* C2 j- v

  38. 5 P* a- L) I1 t- G. H4 n
  39. type3 p' n, B! o: w' h9 V7 g# B
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)& o$ e; K3 m; h4 ^
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']: t3 s$ m% b6 E7 U' {
  42.   end;
    8 Q1 z8 e  a, h

  43. - n0 H8 B  j1 C7 S' v2 w
  44.   IMMAudioEndpointVolume = interface(IUnknown)/ b. R* E/ a: G/ j& h1 s
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    " @/ Z7 E1 o/ h: V# h* p+ e
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;* A& y2 u- G- J
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;  g; s  W2 y1 o
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;8 b* x& t3 x8 E2 q) [
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;, \2 S4 ]- y/ r  M2 q" J
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;' v) \3 q0 T7 i9 j) w2 v
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    2 d/ U0 V/ d: r4 ]+ l4 T5 ?/ c
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;+ c: s+ H# I- P# F: S$ p, I: g
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;( b( ]' b  U# `8 |3 W) r3 X4 N  N4 [: ]
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;8 Q0 n1 L( J2 w% _- S* H( Z. `" ~
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    4 T$ R5 D, f, F4 a
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    * G% H& i/ V8 z2 i- ~
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    : j& o. [5 Y& B( ^$ l; [& F; d  |
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;" I4 h: ~# s3 L- j# H' ?
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    # g3 e. N) @, I; b+ Y# R7 J
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;% b* V0 J- z$ c, I
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    1 l) I# I7 A  R2 Z9 c
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    & w; g. @3 A4 }. H% @7 n9 p; W$ g
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;6 R$ J" f/ J! n6 z6 P
  64.   end;
    / ?8 P' k7 F) u/ M: w7 t
  65. , [& B8 F: j6 _, V2 x
  66. {  IAudioMeterInformation = interface(IUnknown)
    ' S# B9 g8 v4 S6 e8 a4 V' H
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']& H. d  e+ v5 z6 z& g* e" p/ L+ F
  68.   end;}! b2 g* y% }3 W/ g; w

  69. 5 _+ g( \5 D* ]
  70.   IPropertyStore = interface(IUnknown)
    7 N4 f# G1 b, H) V; ~
  71.   end;  Z; h3 _& z* Z& d0 r

  72. $ B" c. ^* q, Q' @
  73. type/ r% x5 B" Q# |" \/ o7 l; F
  74.   IMMDevice = interface(IUnknown)
    % ?$ H. `' q$ D
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']5 }& O2 ~8 y, f0 B3 y
  76.     Function Activate(  refId :TGUID;
    # x0 {& g/ r( d# F
  77.                         dwClsCtx: DWORD;8 l+ U) p  O$ i5 t2 c
  78.                         pActivationParams: PInteger ;1 E, n" m: j9 l4 C
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;7 {8 I5 m; O2 M
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    7 Y( A6 ^. @& y2 m+ F6 O: J) `
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    / z9 }, [( ^5 Y5 ]
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    + ~0 @( P+ J: R& b7 I! E
  83. . |. u& Q# }! u+ u' F
  84.   end;( I: {1 Y# P3 Z+ m5 E( z2 f
  85. $ `5 p8 x/ m/ ?. C5 M& N$ H
  86. ! Y' Q5 Z8 ~- z  H5 b- r
  87.   IMMDeviceCollection = interface(IUnknown)0 u4 e% E2 X% O1 s9 D% G
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ' N/ Y  [3 ~) @0 b! @" q) T
  89.   end;
    % S8 w5 w. G- L6 ^( w4 C

  90. / d- b7 i3 ?; Q3 L6 i
  91.   IMMNotificationClient = interface (IUnknown)/ W$ W% E. X3 _, l- S
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    + \: g0 q, T3 Q
  93.   end;
    ' u2 h3 l1 R- V4 e0 O  v
  94. ! n! i, K' u- R7 ?- h
  95.   IMMDeviceEnumerator = interface(IUnknown)+ m! T1 U; `. F4 s& H" e+ k
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']( I1 U9 @7 l  j; a! h
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    * }, ]: N4 ^6 E. R' k' y. B" M
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    2 f' l( ]0 n. }: N
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;' G; M& c; X9 ~7 Y% ]5 Y+ }- v. b$ W
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;1 [6 T) k0 I# @6 ^3 I8 T/ `6 _5 z: A
  101.   end;
    7 C+ Z/ ]0 o# ?; b4 {& p

  102. + |+ Y1 P. z- s7 J
  103.   implementation
    % o6 \9 h; X. m! F
  104. end.
    ' D- i  u8 U2 Y' h* Z  A1 i4 A

  105. 4 P3 _$ \( d3 p8 Z
  106. Thanks & Reagrds,% j9 a% X4 @/ _! ]# r
  107. Mukta ...
    / H2 N5 a+ n. |+ I
复制代码

  1. 3 g- n% Q5 `: |& f: e
  2. it's work in Delphi 7
    , R2 ^) v( ]6 P8 l; e" x$ {# Y$ ?
  3. //////////////////////////" ]. A$ Q, K/ h. v  p! ]

  4. * }7 L7 T& r0 p9 A' s7 o5 z
  5. unit MMDevApi;6 o' S& t/ `$ I! V- [' r" v. ?* z* p

  6. : S0 i8 ~+ y0 g8 F$ J. o
  7. interface8 M" T. y' z# B$ D1 Q) }
  8. 4 q' y) T0 P  {
  9. uses
    % }$ ~+ z+ p/ ]# q3 @% H% R
  10.   Windows, ActiveX, ComObj;' L$ |" t4 n% t7 P) h) |/ ~8 l

  11. 8 ?6 H, i. c6 V! v; P- M- n. V* `
  12. const
    % v3 s0 m3 R+ C- Q; q7 M
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    1 O  C! {/ M0 F  M# K" ?! T
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';) S! j5 F" D) C- _
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';( I. [2 X  t. p+ W* A: R$ q( l' j
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';) P, r8 L; R) \2 w$ p6 ^
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    + v# J! w9 [0 t9 v
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    " L/ @7 g+ k, k
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';# R7 d" Z# w! H' a% n, d

  20. ' G! N1 e2 v4 G! ~$ V$ K
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    3 Z- _% F  T' a7 K/ C* e
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    $ c) a- K4 ?& W1 f* I
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;, s$ n; l6 `. p: D- _3 x+ t: [: v
  24.   DEVICE_STATEMASK_ALL                  = $00000007;, m. d. q5 }3 m* m$ h- N# b

  25. 3 Z& _7 Z, M& c
  26. type
    # ]; x, r1 B; Q9 x$ t
  27.   EDataFlow = TOleEnum;- {* C# O5 p- _& X" O+ M, k- j

  28. 1 m! Q$ G! u" }/ E& d2 q- X
  29. const
    , k. `, o8 n, ], B5 B
  30.   eRender                               = $00000000;4 R9 z% _2 V, ~0 z# ^
  31.   eCapture                              = $00000001;* \; d, I9 m( T* M, Z3 r' K
  32.   eAll                                  = $00000002;
    6 S/ V! }3 m  e% V! K
  33.   EDataFlow_enum_count                  = $00000003;3 O9 H0 ~9 i5 n! a: n6 t

  34.   x4 ^) ]; i1 |4 E
  35. type
    " C* {' V) c3 g! G2 e
  36.   ERole = TOleEnum;
    ! Z3 q, j% O+ w1 H

  37. 7 o$ y- p0 R4 J9 r$ l7 L& y2 f7 g
  38. const: j& ~" ^, m/ v  W; R* d- P
  39.   eConsole                              = $00000000;
    ' d& z" R! A6 U" w: Y: E% R; @, t
  40.   eMultimedia                           = $00000001;
    ( V' M, X2 L# U! l1 N
  41.   eCommunications                       = $00000002;. U  k* ]/ J" u
  42.   ERole_enum_count                      = $00000003;8 `5 F9 o  U" {

  43. / z) h* K0 F0 ]4 G
  44. type
    % w* P3 [7 N& c7 e+ ]0 O
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    9 n2 S. |/ y) S: a% e* x. S
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']! a9 ]; p' J1 P) ^
  47.   end;# Z6 W1 u' m' k5 r

  48. ! |  s+ N7 r# |/ z* z6 S, L
  49.   IAudioEndpointVolume = interface(IUnknown)8 @$ I% e3 }, e# g( L  G& v' _1 q
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']* ~9 R6 h: l8 A0 U
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;( P( Z' j% v' {8 T7 T- ]
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    6 Z/ e0 |- J! U( M+ T
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    + d& p& k" V& q: q: _
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;" A+ n8 q, p5 T: q- T! t3 u. ~7 w
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    % r6 I# i0 G/ ]
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;3 ~% L5 X# F' d
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    0 p" [" d! j2 p! ~6 l
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;( _. X* y- V# H. ^% y) T0 d
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;  g- c/ F# ]( z) p  K
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;% B3 }  E# k- [( \1 Q+ w
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    " e2 i* C7 p& X6 R* ~; f: Q
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;% P2 D6 |" x( M5 [: h: d. F& l2 [8 m
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;" `6 |  q# A" q% E
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;$ V5 M. q! \# K6 P
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    3 V( H8 A; m& x5 |9 G% V" l
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;2 U! e: ~0 d, j- v0 g
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;" C* Z, i6 o2 ^2 b
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    & x8 {8 V% k/ E4 b: o/ U
  69.   end;7 ~4 r+ B' \: J3 Q) M, C' a# O
  70. . _- e- C8 v; ?% {
  71.   IAudioMeterInformation = interface(IUnknown)" F9 I! G7 u1 p- @
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    9 c* b  H- _: S8 u
  73.   end;. Q% ^. S' l) b- W8 Z5 x
  74. 4 e: ]% y% S" w& M  X
  75.   IPropertyStore = interface(IUnknown)
    5 v9 q) R9 K- a( \* J) N& E
  76.   end;! Z, @3 ], x: ?6 r$ G( P& ~4 y6 n
  77. 6 V7 R& {; j: p/ T
  78.   IMMDevice = interface(IUnknown). Z8 u) ~; Q4 ~$ v4 W0 I
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']- S, T$ v# a% W. F
  80.     function Activate(const refId: TGUID;1 _4 i- E3 E& e5 Y
  81.                       dwClsCtx: DWORD;1 @; o/ D: I3 R& S: y/ {' f
  82.                       pActivationParams: PInteger;
    5 o" {0 M+ v2 V
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;0 l+ _1 V& X! X( ^$ U: p, K
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    ; v4 P$ A0 J- T. t$ \# p# P9 p
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    5 l0 @  G. c  Y2 \
  86.     function GetState(out State: Integer): Hresult; stdcall;; h% Z4 q4 g4 t1 e7 W6 Q, N1 g
  87.   end;* U( g& c* D$ I/ t2 E# ^: Q7 V+ `4 g

  88. & ?" N; z2 B5 h! r: Y; U' T

  89. $ ~: e. a# \, A0 B" [- a/ b
  90.   IMMDeviceCollection = interface(IUnknown)4 n9 x; h* K- Y& [
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    / v, R, ^3 |/ i) V2 Y
  92.   end;
    , A( v" e- p0 r  o" s; r
  93.   W/ N0 u1 Q' Y) G
  94.   IMMNotificationClient = interface(IUnknown); t+ H( B) t6 f, {$ ?
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']+ \3 L3 h- Z  U" d
  96.   end;
    % j9 B8 t, O3 |; k8 z
  97. / `/ F' g7 S/ r) c* r
  98.   IMMDeviceEnumerator = interface(IUnknown): k4 X0 m9 d$ K' |' j
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']& o  L; Q4 B/ X  L$ w
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;0 P2 `( t# k+ l' m
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;8 Q9 Z1 Z2 v# n
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;+ T$ W9 j% `. A9 Y/ M$ T
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;8 z! I. j, P7 m' [8 j% J
  104.   end;, T. o- h5 O1 Y' j, `4 _

  105. # w' |" S3 W5 N4 h8 m* d
  106. implementation9 O0 B* w% W3 A/ c

  107. - m+ x  i6 }& l& x6 I) V! x
  108. end.
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  109. 3 M6 o3 R$ P6 @5 B2 a1 |
  110. ///////////////////////
    5 |# w, r: b5 m  t  W- V
  111. simple sample :)# k1 V9 f& O0 `
  112. ///////////////////////$ h& Q& w* e* O' T" H. y" U# r

  113. ! ]* Y5 U' j% Q2 O7 P+ \( X) `
  114. //...... other code
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  115. ( ]/ e2 n, ~" M; l$ j& J+ u; J
  116. uses ... ActiveX, MMDevApi, ...;! g& D) }9 m6 C; @
  117. . y3 P0 W1 R4 ?. m8 O# B5 y
  118. //...... other code! ^: W' c& R' X3 j; y
  119. , t# M0 l) R! h
  120. var
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  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. ' g( e5 X2 k; R. B7 Y4 |# a
  123. procedure TForm1.FormCreate(Sender: TObject);' l. S0 I8 g- N/ j! e% ^0 I3 M. C. _
  124. var
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  125.   deviceEnumerator: IMMDeviceEnumerator;) ~( M( B0 L1 I5 G& n5 Q& p
  126.   defaultDevice: IMMDevice;8 E! Q* T0 P4 ~5 l
  127. begin2 j/ M( H) K7 R9 [4 _5 A4 G
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);: A. {- s: D3 e2 C
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);0 a) B; }! P. \# B* H4 S" I
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);; f# g+ [, S% o, L3 o% f% j
  131. end;/ }6 [  |$ g6 t, c1 s
  132. - v5 |1 ~1 _$ z9 s
  133. procedure TForm1.Button1Click(Sender: TObject);
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  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;7 i8 F! v: {' P8 ]( Y9 C0 {6 l' N/ L
  138.   VolumeLevel := 0.50;* e- j, O, h2 z5 W# L/ J
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])" s# I! J& D6 u( O+ ]
  141. end;2 h# P% O6 D7 X
  142. : U* |+ h6 W4 J; K7 t+ j- |
  143. /////////////////////////////////////
    ! o- i& F) K- b& S7 O" B. y
  144. 8 V  s5 I7 N! W% A7 K: @# }. y: k
  145. // with best regards ToxicDream) }' l$ T+ Z5 r# z  O, G9 z. [4 @1 ~
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