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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
# c/ O. k6 l4 f5 WBy Mukta & ToxicDream

  1. # O5 K6 B2 Q3 T
  2. //for delphi 5
    ) B* X! j4 Z, X3 @
  3. unit MMDevApi_tlb;$ ~8 ^; B, ]7 O- m! Y3 W+ ]
  4. ; T5 v4 I: O5 L8 L, e
  5. interface. R( |0 U4 X9 Z: [1 ?! U# `& j
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;9 `3 b. w" I$ Z, W$ a2 t
  7. const$ V9 C# [* C8 p0 Z
  8.   // TypeLibrary Major and minor versions
    4 x6 ?( a% R  H

  9. & e+ y" q2 p9 o& O4 b
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';5 `) @, l. R- R' O+ v, t# S7 X
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';7 _3 U. Z6 b/ W: B9 e# S9 o3 G1 C
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';. x& Z1 r0 j; O; n* `
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';9 y. g8 w" w5 |
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';5 H* h8 S. g( w3 q' ~" x( m
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';+ u1 e% n3 f* W6 i6 R
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';7 u9 ]9 Y% W8 ]7 c0 c+ V

  17. 7 W% m! L4 \1 `- h  ^1 U* G# \2 q
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    # a- w3 _- r* w) ~6 e* T
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    ' }; e2 U0 A3 l: l  q2 L" m4 M
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    , y; ]# c& Z, E3 u  ?
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    8 c& P7 g9 n+ E, e
  22. & R8 t2 F1 I7 [# R  L
  23. type9 G+ M8 B- F# `. b
  24.   EDataFlow = TOleEnum;' q( T& @1 J  h6 \( Z
  25. const
    7 \% k- x2 w5 E9 E
  26.   eRender                               = $00000000;
    $ l2 X# ^* o. g( S5 Q1 A: g) Y3 j
  27.   eCapture                              = $00000001;# q! W  O9 y: T# }
  28.   eAll                                  = $00000002;3 t% Y! ?6 }- C) j: o/ ~5 }
  29.   EDataFlow_enum_count                  = $00000003;) H  D8 V% @1 P3 N! }% w/ r4 t

  30. 6 M/ v% [7 S- e. a, @
  31. type
    8 z  {# E4 u; y/ ^  F
  32.   ERole = TOleEnum;
    $ [/ {9 b5 r2 B0 r" i& Y
  33. const
    ! z. C, D! q5 s5 g
  34.   eConsole                              = $00000000;
    9 v# Q& @1 i4 @, y+ O2 Z% c" B3 M) F
  35.   eMultimedia                           = $00000001;' U1 k2 R3 y% \4 m% I
  36.   eCommunications                       = $00000002;
    ' m# a9 P% F3 m
  37.   ERole_enum_count                      = $00000003;7 C8 z) t: h1 G3 ~- V4 |6 Q

  38. . u: c1 @, a' B8 w8 A
  39. type
    ; O7 m1 f& M& B# E& t
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    7 f$ T) j: f3 \
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    3 g" I6 w$ R2 @6 H
  42.   end;
    : k! f' G$ f& |1 x

  43. - h& c! |% I8 j7 {) R
  44.   IMMAudioEndpointVolume = interface(IUnknown)% t! V5 m# d7 ]  v) j& K
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']: L3 x# w8 t$ j+ B- g
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;1 u: Q# x3 j$ N4 V  H* k+ w# E* b
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;# v  o- ]. x8 |# q" D3 |) N
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;' v4 a" j, Q+ P) b/ ~9 X$ c5 J" p# |9 n
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ' j6 V4 p* K# J6 m, z: t
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    : u! s: V" x% y3 n
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;' t( P: U6 g0 A( f1 L8 ?: S2 g( s
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;1 _2 {& K% i* Z- h  P2 l0 |
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    2 \; z/ |, S8 }; E# G7 p
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    & _4 a7 W/ \6 B/ ]6 Y
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;! _4 L& u8 v1 H% @4 B
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;% j( O5 L  \4 f+ q$ t% p# u
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;2 m# X% X& M. Y" z8 \- m
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;% B2 O4 t" Y, g* c3 q- W" h/ v
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;! ~: l; t5 }6 o- _8 ^% B0 b) S
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;+ Y. B' K# }8 A8 t7 Q3 k
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;( ]6 E" x: v) y* }$ P# @
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;4 |. |9 j+ F6 l' v7 v6 t: N) w
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    ( f* J- A5 ?2 Y0 f' Z; o2 C6 R
  64.   end;6 Z9 W0 S! ?1 G0 X$ f

  65. + e4 I2 N) ~  s2 {9 G5 E# @
  66. {  IAudioMeterInformation = interface(IUnknown)
    & J8 S, ~3 ^9 o- x
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']4 `" w9 f  `& u7 |
  68.   end;}
    4 W" u6 c9 D; B4 f+ _3 f% @
  69. % d! B* k% R4 l% _, x( K1 ]* C  {
  70.   IPropertyStore = interface(IUnknown)' v% M# V) C" D
  71.   end;
    1 n6 d! _$ q  ~* W, w" @
  72. , }& }3 Q9 \( V) u/ e: f7 E( x
  73. type
    7 u6 \9 }0 H1 y* f& ^
  74.   IMMDevice = interface(IUnknown)
    4 w. H1 z% ^! T& s
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']5 X9 B# W. u  o& P
  76.     Function Activate(  refId :TGUID;8 c7 F& U8 X+ Z/ l
  77.                         dwClsCtx: DWORD;
    % d" j, W3 g* L8 T
  78.                         pActivationParams: PInteger ;
    3 T  m2 `3 ]! {, v& e
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;# y# K4 p8 R) n* S5 G- ?
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;& K% F1 r! Q! }0 R) [  a
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;9 T8 C) W) _  i( d' Y0 f. C
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    : _6 Q8 \4 M: q

  83. / r" G& W' R$ w9 N1 i  K
  84.   end;8 y8 E) D# z& M5 a+ N/ D
  85. 7 M% B( E7 {8 \8 q! W% M+ e$ j( B
  86. ! I9 a( B( s$ U' G5 j1 y% G
  87.   IMMDeviceCollection = interface(IUnknown)
    $ T& e5 S3 |& c/ V% p
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']$ X8 x9 y7 T% s) A4 S- a
  89.   end;7 ]' G: o* p9 v
  90. , G2 H& G+ c+ F% Q0 |, Y* l8 D
  91.   IMMNotificationClient = interface (IUnknown)
    3 x! @- V( h3 W$ v
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']" \( \7 h( O6 S2 ~( P) Z! ~$ v& D
  93.   end;
    * O4 }* U1 S) Z% M* {% e1 b
  94. / W5 v1 q6 I8 |' j# m
  95.   IMMDeviceEnumerator = interface(IUnknown)
    , c* Y- N& b+ t+ ^! d) L
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    : ^7 a2 i( C$ R4 t2 B
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;, ~0 n- O1 |! S) v
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    ; F" V' s7 V  k
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;, M) S- h8 P: [0 \4 m
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    , R7 }/ C, ]4 [; n
  101.   end;. L" _6 L4 ?/ a. B

  102. 0 N! u3 ^- r" b" _1 B. M% ?
  103.   implementation- A! s0 q/ q# f
  104. end.
    5 I. z# B% T8 b! v( a% S
  105. / ?2 J- J/ ]2 F" @- G
  106. Thanks & Reagrds,
    " W7 U. I& g" @9 R6 [( g
  107. Mukta ...! d- Y) k& ]# q! ?' T; G0 Y3 R
复制代码

  1. $ a) J3 _; y1 b& L# s4 Q0 ^4 g: b
  2. it's work in Delphi 79 F$ }" f5 |% W! a, e- i2 d; f* q
  3. //////////////////////////
    9 X9 a8 X* F/ `2 w% @$ |# T

  4. & {% B& U0 v  F% L
  5. unit MMDevApi;
    1 _1 G9 P5 V' w
  6. " Y8 ?' j; d& b
  7. interface
    ; G3 G3 F+ l6 s* H4 W* C
  8. 6 U. Q4 P+ a/ V/ c, ?( D
  9. uses
    8 B+ a+ E2 c" I% K6 T' V% J
  10.   Windows, ActiveX, ComObj;: O" _0 M8 |+ b6 K6 `% |
  11. 8 b, o( @& G2 U
  12. const
    " O  @; l+ s$ a5 y4 W' M
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    - {1 u" n0 q9 b4 k$ f' c' ~% H3 Z
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ( ]% j; F" Y( t( p, P
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';- f) c6 J: a' x: R; g& d9 g3 `' k- Q3 ~
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    . j' _: R- e1 \8 F/ e- G
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    , S* L3 W* ]! f- a' I' {
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    0 }3 [3 M, I+ T/ d
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';3 a1 x) X+ h: q: x+ Q. h3 q8 ]

  20. 6 U3 `+ r$ m) w- _
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    + P2 ?5 o) Z1 G, U3 f) V8 ^
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;# L) c1 H% K9 Q/ G1 m) t
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    * i: }- ~8 w, F6 ]
  24.   DEVICE_STATEMASK_ALL                  = $00000007;  c! t1 P/ V4 }4 i: d

  25. & ~; Z, B% |1 h( P/ I
  26. type
    8 m6 c7 J3 h, B
  27.   EDataFlow = TOleEnum;+ z! V& i4 D, N; L) a

  28. % Z  K$ G  O% s
  29. const
    ( w. D+ B3 D/ g
  30.   eRender                               = $00000000;
    # ]$ m1 @+ x) {1 q
  31.   eCapture                              = $00000001;3 e) Z) v8 v) G- N
  32.   eAll                                  = $00000002;% E% f! g2 A  `$ o/ Y
  33.   EDataFlow_enum_count                  = $00000003;) o  K0 Q0 w0 e7 }* d5 T

  34.   E' K' ?# [0 F) \9 K/ @
  35. type
    , ?, i6 F$ H: h- C
  36.   ERole = TOleEnum;
    # H  A  q$ _* C& F% \1 v, M
  37. ; {8 {4 Y, @: y6 a; K; x
  38. const
    8 t# \; j3 y+ z- f, j% {( w$ t
  39.   eConsole                              = $00000000;
    , O7 q( N, n; y( ~! N* B$ k
  40.   eMultimedia                           = $00000001;
    * W1 |3 B4 g& o/ m6 n- Y
  41.   eCommunications                       = $00000002;' o  V  ^9 _+ H7 _( b$ t
  42.   ERole_enum_count                      = $00000003;1 w, K5 Q1 n% y  e" `

  43. % i* @; t% ~3 C& s3 s
  44. type; I9 F  S7 N5 {% |3 x; W& m1 Y
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)1 D. B4 m  M7 Z+ Q4 t( Q2 B
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']1 o) j4 \) V8 d6 L  }
  47.   end;5 f0 n8 s" v8 P4 ?% f
  48. ; [7 i5 A: k% F4 U, f, R
  49.   IAudioEndpointVolume = interface(IUnknown)
    9 V+ f, Y8 \) m( W7 S; K/ T
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    ; B$ c% l3 ?1 B3 i) \8 I. T1 X
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;' U  P- w8 q) R8 t
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    0 m7 Q, v: W2 B  F
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    ' x1 Z7 q9 j$ t/ l0 I- a* I
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;6 x3 Z6 W9 S. e+ a0 b
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    8 K( D2 V+ W8 q( M8 Y
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    6 a2 ~/ r* L" L5 D0 M2 l
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    ' K, q1 J3 z$ G5 G5 f+ d% Q
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;7 w( M* I( m/ b2 l
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    7 l" x2 u6 s6 r4 G
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;  N& C1 {! f2 S
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    ( h, ^% y/ u3 C/ h7 G/ C
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;) r  B/ j7 X$ e! `
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    3 M4 H- m) {# x/ l
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    # \# t+ Q3 F( u& I" ?8 M* N6 s0 u$ D
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;9 q4 L8 d( O0 d2 B; {, \  O0 ]; L' a
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;. O# F$ B) c6 {% D) L- U0 O
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;) B+ j1 V6 l6 g
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;( R  c# T  {9 p0 }/ P5 y7 [* N
  69.   end;" h5 v% p; W$ V1 }3 s& F! D
  70. : m, u7 Z4 V0 s6 L+ T
  71.   IAudioMeterInformation = interface(IUnknown)9 V7 Q- C7 p; W. x  m6 |
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']! D2 ~' |8 {$ R- \6 e8 q
  73.   end;; `$ b9 [, B" u3 m  }8 s
  74. ; m% M1 p' d: N% q/ q
  75.   IPropertyStore = interface(IUnknown)
    5 n# k) k" b8 |9 V
  76.   end;
    9 i9 M3 Q2 {. N) g8 n

  77. 8 M  l- y6 D: d# ~; C% }3 I
  78.   IMMDevice = interface(IUnknown)
      d8 ?  w/ N* O. k, H* k# [
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']3 t- N6 f  V5 K( @8 O  K
  80.     function Activate(const refId: TGUID;0 k" D: q! u/ I. G( C4 q4 A' L
  81.                       dwClsCtx: DWORD;6 V# c( L4 E/ ]5 z) \5 E; S
  82.                       pActivationParams: PInteger;1 n9 k  a$ m2 J' {
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;% T- T) h, ?9 i' p( X2 ?( B
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;# [+ T) F1 ~  z2 a2 c- s- K
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;- b% {" d- O7 Y( O, F  g/ n1 D
  86.     function GetState(out State: Integer): Hresult; stdcall;
      Q7 W# M- B8 N( B
  87.   end;! }6 B0 A2 k. x1 e6 C
  88. 7 I/ o+ x9 L" v0 t- n: d

  89. 6 k% r* m6 u; X$ O! |' X
  90.   IMMDeviceCollection = interface(IUnknown)0 u7 R* \' n# I* S" q- M  p+ l) [
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    8 ?( ^  B* s3 M3 }9 B
  92.   end;& {2 P, c" c" ~8 i3 ?6 l* H) }' l" x
  93. 7 E% F. B9 ?3 ]7 Z* w
  94.   IMMNotificationClient = interface(IUnknown)
    - t* Y1 b2 Y6 j7 X5 b" J( U
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    5 M7 x; }( m5 r9 E* }/ p% r* r
  96.   end;/ ?/ ~& u( i0 Q1 J) R

  97. , I: Y# h: b/ a( V& V6 g2 Q4 P
  98.   IMMDeviceEnumerator = interface(IUnknown)% a9 q7 o3 E$ j$ u  l# P1 O, C
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']% `0 W" l# V6 A8 a; E- t
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;' u! W% I6 U2 f2 v# `0 ~
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;, D- S0 I) [$ a
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    ( h! j4 v' z6 t" o. ]
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;! _' L# c7 A+ ?
  104.   end;
    5 V! J$ a" D0 M" ?, f" f( e

  105. 0 g3 \+ S9 n# ~( s, A- ?  s& m
  106. implementation
    5 V7 u8 Q( B  q/ M  m
  107. % U+ _2 i- |" t. o1 V
  108. end.' J: M, n8 m* X1 N! B
  109. ' l5 z0 e) n0 u, e9 o; s
  110. ///////////////////////) V% w( z" `6 q2 Y
  111. simple sample :)/ k9 d# \* h; V; X& _: W* x& g
  112. ///////////////////////
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  113. 8 Y; G( t- f6 d) f
  114. //...... other code
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  115. 2 q( `9 p3 Y' O
  116. uses ... ActiveX, MMDevApi, ...;  A% E: b% A: d$ _* B5 b

  117. ) I0 F6 C1 y& @9 m( |% y, R
  118. //...... other code  J. P# m* d, k' @" i

  119. 8 l9 W6 |7 \. l% J6 I5 z
  120. var
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  121.   endpointVolume: IAudioEndpointVolume = nil;: |. c2 v& ?# V7 D/ Y7 c; [/ }9 `
  122. ( S; c& O* z3 ^' J
  123. procedure TForm1.FormCreate(Sender: TObject);3 l  _3 C6 X$ r2 l9 `% r
  124. var1 k* g4 C. t2 X7 N
  125.   deviceEnumerator: IMMDeviceEnumerator;+ d1 D2 \# ]8 ^6 J2 p
  126.   defaultDevice: IMMDevice;
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  127. begin" p) J) i) P! U0 S) P6 G# b8 P
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);7 l* N/ B0 K5 R. Z; Z/ K4 x0 Q3 Y
  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;% ^. Y) j2 T" x

  132. % }; f( ^  X3 b( H8 v  s2 `
  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;, y8 ?  V0 v5 U9 J
  138.   VolumeLevel := 0.50;* e' F; i& U' E) z
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])) {; t+ F0 A9 @! A+ j
  141. end;% s8 x9 |! V/ Y- R! A

  142. ) `6 x/ a8 [8 l! S8 @" U2 z
  143. /////////////////////////////////////7 l5 ]3 `- R# q( F8 s! d/ B
  144. $ P# l% _3 J4 G; d3 T2 V
  145. // with best regards ToxicDream' Y8 T( @' C* g: p
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