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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# [  K7 h2 Q' G, U* d
By Mukta & ToxicDream

  1. ) n: K8 V# g$ Q* ^. V4 }
  2. //for delphi 56 E2 R: r7 M0 X) D
  3. unit MMDevApi_tlb;" Y% W6 M. _6 I, R7 X# I+ ?5 R
  4. % p0 G$ c6 Q  K# ?
  5. interface
    8 k% l+ m+ j9 B5 g: L
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    2 f$ @9 p: U5 q, M' B
  7. const
    8 d9 C9 i, t  S
  8.   // TypeLibrary Major and minor versions
    4 }7 t! |, x( L
  9. . t2 O$ I+ y! v: o& g5 U
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    6 j! P/ w" X" \9 o5 I
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';( I1 |7 G$ `6 O9 S0 p8 ^4 z) K0 E
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';8 e: H' m4 @9 f% k: j
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';5 V4 K0 a0 O7 U3 o) H( A. l+ _
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    , A( V- B& `" D2 V/ J+ w4 M4 d
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';  y. K; i3 q1 C+ W% Q) [7 }2 W6 Y; m
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    ! k% s' u6 F( N. Y& V- T$ ?
  17. 6 P! ~. q1 T' S' i7 |; |: {. j
  18.   DEVICE_STATE_ACTIVE                   = $00000001;' |- I) y) m, o( i" {; A
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;1 k. [- P6 _6 ~  M# y6 ]6 l
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;1 ?/ q6 t4 W' ~/ _8 ^& B; x2 e
  21.   DEVICE_STATEMASK_ALL                  = $00000007;+ e4 [% G5 A/ ]$ o

  22. * y1 s8 V6 ?3 i
  23. type. m. r; T% _; V' m
  24.   EDataFlow = TOleEnum;2 B5 ], u5 s5 C' a" H) u+ a
  25. const# @& T) u: _  M2 g
  26.   eRender                               = $00000000;
    7 V4 V; C4 v1 Z9 Y3 B$ h, K/ J# d
  27.   eCapture                              = $00000001;
    + Y2 i1 P* a4 G  I1 j
  28.   eAll                                  = $00000002;7 o2 h8 d, B* E8 a+ m- s0 k
  29.   EDataFlow_enum_count                  = $00000003;
    9 c# k( ]$ D/ `* M, r! K+ j

  30. " l' p; }7 _. p- U0 _. N: `
  31. type
    " b9 ^) i! G# e# I" U5 U* w
  32.   ERole = TOleEnum;; j% x/ D6 y: A! b2 [
  33. const" V8 @# e6 ~& I6 A4 P1 u3 r4 O2 f
  34.   eConsole                              = $00000000;0 R+ {5 D  f- q. Q3 Z$ ^
  35.   eMultimedia                           = $00000001;1 H( o+ C# v+ Y1 u  a
  36.   eCommunications                       = $00000002;: J% D- b8 \3 O! j* |
  37.   ERole_enum_count                      = $00000003;
    " q) @" g$ z8 {. Z6 B
  38. - l+ a) J; v8 r' X$ a. Z+ [" N: z
  39. type+ ^# W2 E/ C( V
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    + |5 U* ?$ T2 @3 f% b/ i
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    0 R1 R/ t8 X$ s2 {7 [3 R
  42.   end;
    ! g& H; z3 j% Z/ L

  43. / S, K* N# b) d
  44.   IMMAudioEndpointVolume = interface(IUnknown)2 |: J2 [6 X( n1 ?# ?# h
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']1 _: x7 X" s& o' e2 R
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    5 B/ y9 L, b9 u7 U1 I5 O
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    " Q3 E1 N! b; e
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    ! h- D5 N% R9 p, o; _& f% g
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    4 P5 C% ?+ P4 G, \4 [0 P4 v
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    # r: K* [: n& @. F6 C( o* l- j
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;: @4 o) u0 \# L3 Y/ ?
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    4 t, {; J% I2 O  ?; }
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;# e/ g' H. P! h. x9 H/ m
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    6 j3 b7 H( J- S  u. g  s
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;7 ^! c  K( }( t, `1 L8 n
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;9 r* f" I) o/ F: V4 I' `
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;8 ]7 Z/ x0 R5 T; J$ N) j, t
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    3 I& J1 d1 z2 ?
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;* \9 L$ Z$ Z; C( z4 x1 s( T, [1 I& P
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    0 o; K" A9 D! E- v
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    3 e& o6 s# O& z, v# B0 U
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;& r6 ?7 o, y6 {( }
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    ) t3 j0 Y7 I  L& n4 s/ v  b5 {
  64.   end;
    5 T- R3 _$ x# y' W- |

  65. 7 \& q  j, x7 }. x) m
  66. {  IAudioMeterInformation = interface(IUnknown)3 H$ h9 F, P2 u+ D& _6 z( ]. o
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']% \$ c' x6 W2 p% V
  68.   end;}
    , S" N! f, P6 T8 A, R

  69. 6 p5 v# g  F% Z4 ?# P4 }- E! q  Q) f
  70.   IPropertyStore = interface(IUnknown)
    # {: z# Q6 b1 A
  71.   end;" n- Z  \& H2 ?9 o( q: B

  72. , k. ^2 x2 b  g0 E3 ~
  73. type
    ! Z& K) J% }& h& u, T
  74.   IMMDevice = interface(IUnknown)
    5 {7 \0 b. M* ?. p) J( L8 T" h
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    : h8 J7 ~$ y( H+ X* u3 z! [
  76.     Function Activate(  refId :TGUID;2 {' q1 M( E; a: K8 O- p: ^
  77.                         dwClsCtx: DWORD;9 R( s; k! r/ q/ q! h' B  R
  78.                         pActivationParams: PInteger ;
    1 W0 [" N$ a" C! j
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    ( d3 S! `7 R& a
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    - K* z! R1 a9 j
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    9 K3 [# i! n2 R% z% X
  82.     Function GetState(out State :Integer): Hresult; stdcall;
      D9 b% w0 s+ |$ f1 {
  83. & `8 S* {; N  G+ p* ?7 w5 p
  84.   end;" e% ^, P7 T; X
  85. 9 w7 V1 C4 A! |$ Z- |# U3 T+ p

  86. * J+ o0 Z' o1 W' v8 B# G
  87.   IMMDeviceCollection = interface(IUnknown)7 X7 W4 \9 [6 J/ T
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ; p. f8 p' n3 ~3 I2 L
  89.   end;
    # z6 A/ g: K+ r$ l1 f5 y

  90. 8 J5 o5 t1 U5 C
  91.   IMMNotificationClient = interface (IUnknown)
    " [$ u; S- Q' o. Z
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    * L5 q) Q8 {6 z6 i2 g% \
  93.   end;
    % g- d/ e; @7 [2 |7 M8 E
  94. ! A0 k0 k! s6 j8 r, ]7 h# u
  95.   IMMDeviceEnumerator = interface(IUnknown)
    + U  G$ e5 ?6 \# s5 b, ]
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']& m. b0 N! z2 J/ M
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    : a/ {) [2 R2 s1 v8 i/ r
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    1 q+ W# Y; X5 e, @5 y0 [
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
      h# G; Q' N$ a8 D' Q/ i# S
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    ' v# [+ h1 m% p2 A" V3 m: i2 S
  101.   end;5 d$ D' k% h. O4 ~" t1 `( @; C) C5 s

  102. 7 K3 D2 U$ `. [; S  q6 w: w* _
  103.   implementation
    ; O2 Y  ?& L+ _9 @% o& {
  104. end.$ T$ E0 p( C) m( ?8 S* ^

  105. . b( s; J% B  v& c3 d
  106. Thanks & Reagrds,
    % o+ i( e. O! S: \
  107. Mukta ..., P0 A& Z& }- q" ]1 ~3 x. o5 ?! s
复制代码

  1. / w+ h- V  `. p( R7 z% O
  2. it's work in Delphi 7: A: z6 y$ F  ?5 k: P, l
  3. //////////////////////////9 h; J7 v) v; N9 L
  4. : j$ o& J4 N( g, a% A
  5. unit MMDevApi;9 T( ?) Y5 P( N9 j

  6. 2 {% h9 ?" `' B! M9 ]# ?
  7. interface
    # o7 w: a( \! \/ P, O, P" H
  8. / ~3 K2 t1 g5 \9 I
  9. uses
    # \$ ?; s) N! e. ^
  10.   Windows, ActiveX, ComObj;
    / L* W; X3 @; y; |# K+ _' N/ F: q

  11. 9 W, n1 J) u# I# p4 A% k; K4 K
  12. const) [/ {8 ?2 u' c5 b  @+ j
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    - m; U7 c$ e0 t2 d  ]/ ?
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    * u) F: i% q, @2 V! `
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    $ F# z. U5 O1 e$ s
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    - _% a4 q9 {8 [+ J5 k
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    ' s3 X1 ?7 ]! }* W& f8 u
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    8 p$ y, t4 M4 C
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';9 D9 u1 F8 }: G  x
  20. 5 x& i; y7 [8 h, S. Q3 w. `9 t9 d' Z
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    5 t  z4 B/ _& M' ~  }
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;& i# e* y) u2 c5 D+ |
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    2 R1 u! U- G1 f. f% s
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    4 o2 ~& e, c/ v" w7 z' ~
  25. , w4 @7 |* r1 ?" I! E  K
  26. type
    ! A/ U: n3 U& {
  27.   EDataFlow = TOleEnum;6 {. }: C# s2 J

  28. & U  S2 w4 \- E( k( f  L" f7 ]
  29. const! D" i% k( O. i* F0 w
  30.   eRender                               = $00000000;! _. L6 U2 R! w& j+ ]3 E. u0 ^2 y
  31.   eCapture                              = $00000001;
    1 {+ r4 k; P6 H7 C+ w
  32.   eAll                                  = $00000002;
    * ~9 [* }+ H( r4 X7 ~6 N1 N0 l, `
  33.   EDataFlow_enum_count                  = $00000003;) s& T9 H7 _: @: W" R$ a

  34. " `5 z9 ?. l. j9 p2 x+ l
  35. type8 I* ]/ m$ G) n) g0 S( K
  36.   ERole = TOleEnum;
    * [) z( G# e* I  d  R0 I
  37. 2 W8 g5 r9 r  v& Y+ d
  38. const* m% N- _/ C: W- ?7 e0 k) X# V0 f
  39.   eConsole                              = $00000000;9 Q7 q+ Z" ~9 r8 B) D
  40.   eMultimedia                           = $00000001;9 b  s& d% U; g& u/ W9 F/ d5 ~
  41.   eCommunications                       = $00000002;
    8 n' _- Y% {: V9 m) i
  42.   ERole_enum_count                      = $00000003;
    & o$ E4 t8 D- U& ^

  43. ; B4 d: O2 b0 S- J
  44. type
    ; |+ P& Q0 E2 u- @6 U& h
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)0 A8 h2 X/ D$ q
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    2 y5 z* \6 V- B; _3 @8 ^
  47.   end;
    - J3 x0 j# A7 s4 [0 J, D7 q' I

  48. 0 q8 H) A6 Q! z5 l! N
  49.   IAudioEndpointVolume = interface(IUnknown)
    2 |+ V  o) R$ x/ O$ f) l3 X) b$ R
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    : O6 D9 @0 l+ D/ `8 B4 C
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    * g6 t) E3 m& ~+ M; I, J
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    / V' e  c) b" O% m6 z0 m
  53.     function GetChannelCount(out PInteger): Integer; stdcall;2 E1 ?4 [5 A, ^& b: K! M6 ^
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    # p: f7 w+ k! R
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;/ [/ X$ {* b4 T! i6 f3 R
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    7 O: B$ [0 s$ v! n& c0 X
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;( w  z: m+ \) h! G
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    . |4 V+ F! S2 I7 k- n
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;* c6 t9 v& {6 Z: r: c8 Z+ R
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    % U* a$ O' p- ^5 F; y& V
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;' V- T& ~' @& u$ E
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;. b2 M9 ]8 ?3 Q" V
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;2 M1 [4 @9 }" o/ I
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    * P% H+ }' X4 t3 x! p4 P
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;& ^6 X' A( v- ^6 N
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    $ Y! y! P! a6 o
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    0 |9 B" y  k5 N- g5 \$ m! h5 p
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;8 S5 X6 _5 W! r. O, d
  69.   end;
    1 l1 z) E: A; D( S: d; q6 m
  70. $ U8 y  A4 n- c
  71.   IAudioMeterInformation = interface(IUnknown)
    " a7 w& ?1 Q: T
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    ( i- n7 Z# J' Z
  73.   end;( ^" {+ t$ u" m# X& V
  74. ) O0 L8 L% v% a) L% p) _0 J
  75.   IPropertyStore = interface(IUnknown)
    6 M9 L) C) c& g' O3 p8 {' ^! ]
  76.   end;
    9 W' H$ A0 `0 O3 E* [- I. @6 [

  77. 6 N/ f7 v5 ^& ]- ?
  78.   IMMDevice = interface(IUnknown)
    2 P* ?1 r, ]7 X: C! J2 P# X
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']1 ?2 P, R* [& P) I- H% K- x2 s+ B
  80.     function Activate(const refId: TGUID;
    ) l8 R5 j; c- q8 E7 b7 b* r/ |! z
  81.                       dwClsCtx: DWORD;
    $ }. S& L$ d" J% \" n# V
  82.                       pActivationParams: PInteger;/ n8 J: ]% Z# y, o, B
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    + K% s+ M$ H* b' |" Z
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;$ x* Z! \  {. X0 J0 a. T
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;, j  [6 O7 g4 w2 Y$ y7 Q
  86.     function GetState(out State: Integer): Hresult; stdcall;4 }+ t7 d9 ~. M2 n# k/ m& n* T
  87.   end;
    % g" G6 G- r9 `3 C1 c3 c

  88. 1 g" g" E2 U0 y" a7 m

  89. * n& A2 R/ l0 b4 Q" L6 e5 z
  90.   IMMDeviceCollection = interface(IUnknown)
    ; `$ Y1 f1 I8 x* T
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']3 P2 y# a9 l% m! ^' b0 E
  92.   end;
    ) q/ o- u$ g& Q* A2 |8 t# N( B

  93. : J1 L  L; ]/ S* n0 i& y8 _9 V1 {
  94.   IMMNotificationClient = interface(IUnknown)
    ! R2 X+ v0 z0 S
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']) V- {6 ?& p4 |( f* T
  96.   end;- b% ^9 |- c* T) ~1 R0 Q
  97. & H+ R/ U5 o- Z$ L- M3 j
  98.   IMMDeviceEnumerator = interface(IUnknown)
    2 W4 [" o5 U$ k; f
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']: U" @: T' h) q7 ^7 [) ?
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    0 _# t- ?4 X8 S3 d% w
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;& Y: W0 `2 @- C, _6 ?* i# W! c( H
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;+ S# z; B. X; H% s$ ]
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;0 n8 b# h) X( t' r& F
  104.   end;
    / O4 N9 N! [- Y/ _. b

  105. . [8 B8 P8 _# [0 \) z
  106. implementation
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  107. / B4 q5 l6 ~+ z) W  x
  108. end.4 C4 T# t% l: i( x. X; g6 @  |
  109. 4 ^1 v* U+ b; Y" \, `( F& p
  110. //////////////////////// P/ J+ J# I  Z1 @8 f4 O
  111. simple sample :)  W# Y; `# ~' g4 x9 q; j& P: g
  112. ///////////////////////
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  113. # ]- J7 g$ z4 T' U' z
  114. //...... other code
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  115. + G" X2 R9 P$ Z% `3 Q% ?6 Z; Z
  116. uses ... ActiveX, MMDevApi, ...;, i/ ?: P2 ^7 d
  117. : v/ v, `* v7 G5 K$ f( W
  118. //...... other code
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  119. : H$ C9 H# a! _9 x+ |
  120. var
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  121.   endpointVolume: IAudioEndpointVolume = nil;* y5 K: i) h3 |  o5 E

  122. # {- |/ f4 x; o' V
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var
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  125.   deviceEnumerator: IMMDeviceEnumerator;4 }: j# B& t  v2 j
  126.   defaultDevice: IMMDevice;+ R0 u- n4 a2 A+ ]( D$ }1 G9 y
  127. begin% N$ S/ V. o9 v7 v
  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;9 y; w. N' W$ v! l7 K

  132. ( D# @1 e$ i. p6 H- M- I
  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;
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  138.   VolumeLevel := 0.50;2 O, Z! R4 H" b* y6 H9 ]( S# l
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);$ R& u- q# K$ z" m2 Q7 c  _
  140.   Caption := Format('%1.8f', [VolumeLevel])0 T. z4 j& K& }) u
  141. end;4 X) G, U* j0 Y4 N
  142. ( y8 m% A; y) U0 A1 O4 S
  143. /////////////////////////////////////
    $ I) d" V. s/ k4 Q$ c. ~) N

  144. 2 i8 d8 Z% h2 l4 {3 d  V$ q
  145. // with best regards ToxicDream
    & C# X5 V4 S/ v
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