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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/ q' u7 @! j7 ^7 w5 f: L* k& b; H
By Mukta & ToxicDream

  1. 5 b1 M  d& R8 b: }7 ~" A/ L7 |! ^
  2. //for delphi 52 E  ?' }& B/ f! m
  3. unit MMDevApi_tlb;% r1 O0 Y# @  ^$ `6 k

  4.   W" `' J6 H. s  P
  5. interface0 P% m+ Z; u, ~2 ~3 }# c: o
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    9 }5 j' C6 G' I
  7. const; N/ S. Q/ u! M% T1 s
  8.   // TypeLibrary Major and minor versions
    ; Y, I% {( {5 N
  9. * v7 @. p5 F) }0 m
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';" E3 p$ U" o$ C  u- v" t/ x# R1 E
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';+ s& z2 h( D: D
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    $ o' q! Z) S6 n0 |9 ]& T
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    . M" h* {# t7 s; t' h
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';, H" \1 ]5 U# B2 `; l
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';% ^, [. ^9 f8 ?0 u
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';( s# z7 \7 n0 R3 }) T

  17. 4 l$ }* F. d: l/ S  B7 B! D7 h, L
  18.   DEVICE_STATE_ACTIVE                   = $00000001;. r) h' u) h; z
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    ( }, _7 [0 U# Y, E
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    . h* S. C' \0 z7 i
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    ! p+ F2 G6 q, W! @7 f
  22. . a$ h. s8 \6 d& t% Q
  23. type0 \. y2 G5 B  H# @9 Q
  24.   EDataFlow = TOleEnum;  O" `4 `+ m: `) G
  25. const/ D6 }- u' d- f, R. @
  26.   eRender                               = $00000000;
    : P- p% {* E5 \1 b1 F' S5 U4 C! H
  27.   eCapture                              = $00000001;
    5 W% ^' {. K# ?. R6 Z2 R
  28.   eAll                                  = $00000002;$ S& ~" H% c2 n& x) I* P; T5 U: J
  29.   EDataFlow_enum_count                  = $00000003;
    8 ^) ]6 A9 f2 c2 _# l- P! W$ C
  30. 2 c$ L7 w; C, ^% H/ l
  31. type5 \' |; R1 c  t5 k
  32.   ERole = TOleEnum;
    - w3 o) d. G, Y- K6 W7 u
  33. const
    $ O% h7 f$ F9 r! u  }5 z% r8 n
  34.   eConsole                              = $00000000;
    + P  G% s! }$ \0 ^2 m
  35.   eMultimedia                           = $00000001;# Q0 t6 M& T- p; W
  36.   eCommunications                       = $00000002;
    ) u/ }( f+ n7 P9 F9 Y6 X% a  K& N9 F
  37.   ERole_enum_count                      = $00000003;' d: h2 ^5 Z: h0 {  ]! m4 N

  38. / T: t& Z: v5 i( h- I# w
  39. type
    ) c3 V& s7 y# g
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    0 S& Q4 m, e$ N) x+ z0 R$ ^# w
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']# C- R% ^( ~# n
  42.   end;2 ^2 u# W, E. t4 X* S

  43. " s( G- K: w0 j
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    8 ^# g* F/ {: l1 B% b* P0 p/ Y
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    & p: U6 H8 \) B
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;% u3 R$ F/ l4 |* e# [, P7 A
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;" D8 o" P  ]3 I& K+ e
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    ' C: N) Y: N. o  H; z- [% W; M
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    - M# F4 `2 B& J  v" L
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;; h. C3 u" E% e
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    : h3 d# ~1 K+ h, r8 y
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;8 w6 G/ c% S+ p9 R" I
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;! n( [" s% p! z6 w4 _$ s- t
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    " d& Q8 d7 i% {) C1 }
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    / g4 b7 s3 m& Z( F: G* n. o
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    ' Q' A" Q' q' X7 m, r( a2 D7 D
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;. L  h* D, w7 M
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;' p0 }  X0 d+ p, t* i# P7 O
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    1 x6 D$ h4 L* x" r- k& ?, k* t
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;, q# e" E9 D% C1 z
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;: u1 C7 n) n" d! W  P0 e5 a) X7 s
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    $ y. P' U! _0 U* U$ x$ I" a# K" `
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    . N4 ]8 y% t% P! ]: B
  64.   end;
    ( s3 }$ f# [% S. ?2 X1 x

  65. " e8 {/ H* f- O6 `# I  c( n2 i
  66. {  IAudioMeterInformation = interface(IUnknown)# ~' n- t2 O. j6 N' r! y7 d" E, e+ K
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    + s! c, X9 O' Y# ~& g% w+ `
  68.   end;}
    4 q$ K" Q1 l6 y, w- E: K) H3 {
  69. 3 z" R+ `7 v( R: y; b4 K2 a
  70.   IPropertyStore = interface(IUnknown)
    & z  z9 Y! @4 o8 G% t- |9 i
  71.   end;% M& u6 D) f" w' b$ d' A

  72. . [1 O8 n! o1 r6 u! K
  73. type
    - j. P4 F9 ^" o5 I
  74.   IMMDevice = interface(IUnknown)
    . V; V# O: k- n" X, ^. ]0 ]
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']7 e  J% C1 U" a( r" R
  76.     Function Activate(  refId :TGUID;% M7 I' P3 L6 h  P
  77.                         dwClsCtx: DWORD;
    ) J7 w5 B/ ]) d, C; J
  78.                         pActivationParams: PInteger ;
    , ]- T4 m! F4 {, b$ r. ]! Z  l
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    ) J5 F* X0 @+ b3 m
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;- n1 A. ]% `8 H
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;8 }! z5 }; u8 B
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    ( V0 s4 ]. O- k, I* ^4 Y. B6 Y

  83. # ]: K  n7 ^# ~5 D7 d+ h
  84.   end;
    , q, X) A1 ~8 f  w
  85. 8 o7 [, i8 i9 _. S7 h) R
  86. 4 e9 G  P& t3 X7 m0 U( X$ W1 `' l
  87.   IMMDeviceCollection = interface(IUnknown)
    9 \# ?3 S( `( n  A1 e
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    # ]5 {: Q( M1 J( E. q" Y0 r
  89.   end;2 U/ _8 x0 z* Z! e

  90. ' v% T$ i) [5 J! \
  91.   IMMNotificationClient = interface (IUnknown)+ y( l  ~2 c0 i1 A( b+ X3 T
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']( e5 _, ]8 M- G  g8 m
  93.   end;6 }6 f) N/ z1 U5 @, h

  94. 7 n- h; k3 p) o, S& l& l
  95.   IMMDeviceEnumerator = interface(IUnknown)  `) A; m  S: I9 g% y& z  N
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    8 x9 k$ S4 c/ |
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;+ e2 m4 G& R9 l  k
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;2 |2 n/ ^2 d1 Z. `. [* t) I
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    ; j0 d5 J/ w, d
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    " V* n* Y8 T& B5 u4 \' P8 f
  101.   end;. I' _$ U8 X2 e" [2 p
  102. & j8 W. |, s1 {! I' E  h+ s* A) o. \) R
  103.   implementation5 ^) C8 D, H4 \! q: R/ g
  104. end.
    $ g" s+ B( O* o% X

  105. 6 x& d0 \: S' ^$ W! v% O
  106. Thanks & Reagrds,
    . s' A6 J: C6 H. Q, z. Q1 S9 w% Q
  107. Mukta ...
      X2 j5 L" @, G8 `8 @) [4 P. ]
复制代码

  1. & l! U* s( V! t$ x& P* U
  2. it's work in Delphi 7
    2 T$ ?& u* z; Q8 g; x8 z' u
  3. //////////////////////////( q* V+ t! p8 Q0 e
  4. 1 L9 h8 O# y) ^' A" c
  5. unit MMDevApi;% N0 r# M/ p9 D! \" Y
  6. : h! Y- x/ i, v9 y. A
  7. interface5 x& H1 I' I' B, K1 H

  8. 0 B& Y; T) y$ m
  9. uses
    " ]% t# n6 @$ {! y5 N: Q5 h
  10.   Windows, ActiveX, ComObj;2 @# S) }# g- \, T( q/ A' l

  11. , x0 z) A+ Y6 |' F' ]& Q( F
  12. const
    ! j5 ]( _# F5 k0 O3 E- y
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';( d- V$ E# f1 @  p, v
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ' Q7 S# ^/ [5 D3 G( z
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    * u- x  L2 l  ~" N6 A: B: [- t
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ) q* f- b* W7 k! J9 M- k# O' i
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
      G$ M) c9 H% M
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';8 s  O2 K# t9 i! i  l& P
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';4 B: G4 W9 L$ A3 l: S
  20. - Z: F, `+ j+ I& S2 H* S' t
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    + ]. o  Z0 L; _- Q1 D. r% x) _$ V. x: c
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    ) q% P4 X; a% p) P8 i. S
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    6 q- K" D0 H' Y
  24.   DEVICE_STATEMASK_ALL                  = $00000007;8 \1 {4 c+ u2 l) }' w3 u
  25. / s1 T' t, \4 y* M/ i3 l! j2 G
  26. type
    # ~+ x* O, @1 M( k8 |
  27.   EDataFlow = TOleEnum;
    - s7 D% d: T& R$ B- y5 l3 @
  28. ' \' f; m8 H/ E! P: C4 u: T/ m* Q
  29. const
    0 t6 n0 q2 J9 m
  30.   eRender                               = $00000000;! G5 Q$ I3 N8 L* Q# ~1 X
  31.   eCapture                              = $00000001;
    , O, h: ~! }& N) c$ w( `$ e
  32.   eAll                                  = $00000002;8 o  P8 I  z9 w% M* Z
  33.   EDataFlow_enum_count                  = $00000003;
    ; N- m) Q" {1 M) A' X7 u: f

  34. $ b7 l2 j* j2 L+ R2 I) U
  35. type5 P- ~8 B4 _6 |# D8 i, v
  36.   ERole = TOleEnum;
    3 Y% A7 X, _5 [( ?7 A8 P$ a
  37. ; C) X/ S  y  ~0 D
  38. const
    , V% {8 c. V6 o) o/ i
  39.   eConsole                              = $00000000;
    9 w, A' G* N/ l& q4 M1 u
  40.   eMultimedia                           = $00000001;
    1 \- ?! M. ]$ ~) \+ l  P
  41.   eCommunications                       = $00000002;( Q7 W- w$ s+ I. c
  42.   ERole_enum_count                      = $00000003;/ a& v; f) g# {' g
  43. ) l8 N# m( a! T9 J* w% B
  44. type
    . {/ f. x& \8 a: }* |; P4 d
  45.   IAudioEndpointVolumeCallback = interface(IUnknown). K0 w; @8 ~" @- j0 }: u. [
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    7 n# |/ z7 O& g
  47.   end;
    ) }3 i+ e% ^7 s1 P; A
  48. / ~( D) U3 E9 `6 i7 b7 z* q, W- o  S
  49.   IAudioEndpointVolume = interface(IUnknown)7 x  Z- n" o2 X- Q6 S3 l, \
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']6 Y1 I! U' r( o; L" E" Q
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ( f+ h& p/ M5 U: T
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;) ^" O( s( S# U5 r3 Z1 L" [
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    ! @2 [. X6 T- E/ s# \1 m
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    2 Y1 L5 x3 U  A' {* G+ C
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;% [' _3 `$ X2 g" b: {& q6 [/ G) B, w
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    6 h; m7 B- L. O3 a
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    5 A, e4 o- g8 W* K4 n- X, X
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    4 C/ G5 ~9 J, J: U
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;+ ^. k6 C+ U" `% z$ W
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
      @  Y- P! i4 o8 ?8 t
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;' p3 Y) u( m4 N5 l
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    7 }7 Q2 E5 c) p
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;) R3 L/ |; z( g  L! z+ o! ]6 y
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    ; V: H8 W- ^7 I# X- M) X
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;9 K+ t! A' c, @# v9 G" _, r
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    / I4 {3 p6 H# a9 A' T
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    3 ^/ g9 |' h: j6 C0 w# k
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;  N  M5 W: A0 o
  69.   end;$ m' k4 w- n3 X8 \. T

  70.   S. m- ~3 u7 R" t- ]) g* `
  71.   IAudioMeterInformation = interface(IUnknown)
    6 y3 B& ^; x2 |! |5 H2 o$ J  H
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    % v( R6 m) L" n, l, w" Y
  73.   end;
    * A' ?, k# A; X
  74. / Y; V" `; P6 X
  75.   IPropertyStore = interface(IUnknown)
    ! X' R, k# o; W, {# O( ^' o( K' _. |
  76.   end;% ]. T4 Z* X2 X- p4 I
  77. 5 j: x0 L! R6 u2 k
  78.   IMMDevice = interface(IUnknown)
    ; y3 G' a& V, y7 _0 ^# f* c+ W, [
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']0 |8 t9 _  S0 v) _' B" |1 z( c- f4 u
  80.     function Activate(const refId: TGUID;$ [$ C, W8 g5 M: _1 B  V9 J
  81.                       dwClsCtx: DWORD;7 s& i0 h. {7 j" h0 {  c' A; E
  82.                       pActivationParams: PInteger;
    0 l& |0 s6 W* u9 s* ^6 q# c6 \
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;. U( `& N& O8 P8 f* Y
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;' Q! O0 x! \6 r' N; Q' W
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    ; @, H3 v# L5 H$ B& k: H! r
  86.     function GetState(out State: Integer): Hresult; stdcall;
    3 }& {, z' ~+ p5 }: |* H# j! o0 |
  87.   end;% N3 Q9 T2 ~* r$ b4 F/ c. r" V
  88. $ b2 F3 L; B" D, v
  89. : V3 d5 n$ a& M/ m7 B
  90.   IMMDeviceCollection = interface(IUnknown)' c# y; F0 T9 E+ ]8 @0 T4 \
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']. }' _( h) {, C3 e: k
  92.   end;4 W8 W- y9 A/ b2 n" ?! {! T* ]
  93. * d5 T  q5 ?. A2 V$ Y+ q* R7 T- S
  94.   IMMNotificationClient = interface(IUnknown): M* V+ Z5 Z$ t! [4 W6 W, B
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']4 S$ D  ]. Y: d- z& L  s# f7 j
  96.   end;4 |! a9 h/ [. c7 @# O- W

  97. + [3 X2 w6 U  M3 ~7 i. z
  98.   IMMDeviceEnumerator = interface(IUnknown)6 C4 `4 P/ P7 \  M$ z/ H
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']  i9 |# K" L6 V# N9 L6 k3 |
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    5 V) ?5 X6 G) s  Z! N
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    1 {9 M4 y! J0 h+ W1 d
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    " F" v$ Q- g0 h5 a
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;/ s8 B/ S" \: I8 c2 Y) s
  104.   end;: f1 N" ?; z& t; B2 E6 x

  105. 8 ?$ i" V# ~# I8 [% W6 g3 S
  106. implementation
    " _) L; `3 r/ O! S- y0 l

  107. ; N8 e& ^* t: I/ m0 e; e" s' ^
  108. end., F5 T/ x4 w- c6 D2 H, f8 y# f

  109. . G! K. B& Y" O9 g: X1 N  [
  110. ///////////////////////$ p: l7 G" U) Y8 z/ I
  111. simple sample :)$ C$ B7 R5 b. N+ }* |4 Z
  112. ///////////////////////
    / t* z# g; Y; B3 u( [

  113. & `) u0 }# f: _+ d
  114. //...... other code6 G2 F4 s' w/ q( d

  115. 3 r8 M; K3 `# D6 F  {! `% ~+ z
  116. uses ... ActiveX, MMDevApi, ...;. }- y, G' }3 \- T

  117. " T% y+ F7 Y. D; h9 ~
  118. //...... other code" f! W% X$ O8 m8 c: O
  119. 6 W* k2 M) D9 J' n0 s
  120. var
    7 d# w, k. T( Z* L" ?8 Q% x
  121.   endpointVolume: IAudioEndpointVolume = nil;# N' k0 K' [* n: I3 e$ _
  122. ' g5 g( p0 I) G) ~4 r( S' \1 K
  123. procedure TForm1.FormCreate(Sender: TObject);3 }( g8 w0 B3 _/ w# L
  124. var
    * ]% l, S& z$ @6 h" T/ B
  125.   deviceEnumerator: IMMDeviceEnumerator;
    5 H! \# [2 |9 J$ \* ^
  126.   defaultDevice: IMMDevice;
    : V& t$ T- ?/ d% z  e/ a
  127. begin0 Z0 w1 S9 Q1 N8 K9 W- ?
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
    9 i' v7 K  S$ n& t4 |  A
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);2 ]* I. |) G: A
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);5 a4 J; i( {, g; Z8 |
  131. end;; e* @. c: [: ?
  132.   W$ z( L/ V$ K& y: i% U
  133. procedure TForm1.Button1Click(Sender: TObject);3 J2 k/ g+ n5 c: \
  134. var
    # |, r6 ?+ O# y% e# d. B
  135.   VolumeLevel: Single;! }2 _4 f, G6 C0 F, Y" `8 m
  136. begin
      E# E: x2 }! I% S& J( B: K
  137.   if endpointVolume = nil then Exit;
      M3 w3 k* e+ e! l) ^3 D
  138.   VolumeLevel := 0.50;
    . c7 ?+ Q! Y3 w% q
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    ; U0 ~5 t, k- L$ V4 l
  140.   Caption := Format('%1.8f', [VolumeLevel])! }: W$ p1 f5 R
  141. end;9 |5 x, ?  {% ^" p  ^. \, x; Z" y9 G' j

  142.   o2 T, x+ u- g5 R- Y% I
  143. /////////////////////////////////////
    * l& E$ e( }& q' S0 i
  144. : f; ]0 J- H2 H/ V
  145. // with best regards ToxicDream
    , O' X" N& M: @
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