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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; X! h& s( y% K& i) P
By Mukta & ToxicDream
  1. 5 ], `8 \& G- z" _+ h, J' [4 H
  2. //for delphi 5- Y9 S7 E3 n" f4 {: T# K& T  z4 M
  3. unit MMDevApi_tlb;+ Z, }0 v! \: A# c% w/ j. O  F# g% c

  4. 2 B& X$ C4 }; p8 ?* f, t
  5. interface
    ) N$ t- d5 C) o% P# _6 S
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;4 W+ u9 a2 i7 @" P& I# ^3 q
  7. const) }* W; @, k, u" |7 I2 C
  8.   // TypeLibrary Major and minor versions
    * q* d# t4 h( ]7 H

  9. : i4 i. D9 H# V+ R6 s
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    1 I: K+ C1 s2 n5 m  F9 E& H
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';" C5 I" K9 s( O! u4 r2 `7 o
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    * _& ~; h9 W$ ^: T9 Q
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';( `; ~& o! b* Q- w
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';% k4 W& P3 V  j% E2 I
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    " o1 l1 n) r. g) B$ x$ F6 X  Q' g
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';3 d2 S3 m. s/ y1 t
  17. 0 j- M: r* O& N, R7 `2 Z9 o
  18.   DEVICE_STATE_ACTIVE                   = $00000001;2 o+ M  H+ d+ R) X1 w) F
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    : c5 F2 w4 P) O$ K
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;/ I6 r: b% Q) i( q/ c
  21.   DEVICE_STATEMASK_ALL                  = $00000007;# z0 Q( p- b4 M6 V( D
  22. & ^- [0 Q/ b* V2 ]6 j0 F; |
  23. type
    ' c6 K+ ^1 H! D. e+ Y* ]& K
  24.   EDataFlow = TOleEnum;. f" w# h! z/ K! ^
  25. const
    + A* Z* v* {7 p' P4 h, b8 Y
  26.   eRender                               = $00000000;/ m# G6 r1 {& q% p; P3 A
  27.   eCapture                              = $00000001;0 h7 h; {$ g, ]6 F$ W4 q: M! D
  28.   eAll                                  = $00000002;
    / O  p7 P  o$ |0 P; n
  29.   EDataFlow_enum_count                  = $00000003;
    ; v5 z, j; }3 ~7 B6 @

  30. + d$ e* e' i9 c9 C& m$ c% ]
  31. type
    $ `# y3 g& j1 r: K
  32.   ERole = TOleEnum;, M: m6 i, P" Q; A+ {3 E
  33. const
    ( d( n: {- j4 j# r6 [
  34.   eConsole                              = $00000000;+ p- ?8 O5 D# }
  35.   eMultimedia                           = $00000001;1 ^5 e+ Z* R" x, @8 W! G
  36.   eCommunications                       = $00000002;9 F# ^7 t: Q& b7 j% p* T
  37.   ERole_enum_count                      = $00000003;
    1 [. U+ d' `1 r- R6 b+ A3 c
  38. - F7 _, u7 V4 T7 w
  39. type( e+ G9 a: U; u( [
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)! j7 @  Z/ o5 ?7 m, i! f9 D3 }
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}'], D6 r7 Y& X9 L# E9 Y0 d! l
  42.   end;* e7 g! P! h  ?7 H, X1 H, ]
  43.   W1 H( W, G" e% Q) _
  44.   IMMAudioEndpointVolume = interface(IUnknown)1 V8 ^1 T0 B, i+ u5 N+ k. C$ A
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    ' l2 O( O% I# e
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    : i3 e' h8 ?# D2 U2 w7 w0 Q# G
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;: R: R' I  o# i1 J0 T# H) e
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    $ w6 p2 g* {; N" F
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    % x# t8 F+ v# S7 N# y2 f
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    3 ^0 C0 L$ U; O( ?4 {7 Z3 ~9 A
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;- M6 v4 b" D7 g( Y. W1 e
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;4 D$ {# O1 p+ S6 C: `$ w6 e
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;4 i- t  L& H5 Q
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;  u* J9 H. y4 t  c9 g' J( B6 ^
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;( n, C8 f  a% ]
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    ' m8 `' o  h/ B8 X( Q
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;$ @; h8 j. p9 ^3 g  H7 g5 ?
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;% W( T; J8 L1 M$ @( k% Y9 x* d& W+ g
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    2 k6 T* p2 M0 {9 _) a
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    . [5 v. }' _. a
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;" B/ F7 L" X. [; ]
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    # j* k/ v, G( b7 x3 i3 M
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    & q" }( b4 i0 F. N- e4 G
  64.   end;
    # v) o' i# L% N0 W

  65. ! K! \/ [) S( `( l# }/ h
  66. {  IAudioMeterInformation = interface(IUnknown)- |  P( G$ j, D
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']* a' v0 G1 c3 y- ?& j; K1 ~# Y' W
  68.   end;}/ u4 {5 ?4 u; ?  Q6 X0 g! R

  69. % @8 l' M( I. R8 C" ~
  70.   IPropertyStore = interface(IUnknown)4 ~7 m; n, Y: Z! M/ g
  71.   end;2 G" P5 D' U* B/ v) [$ p; i& W
  72. 8 z; N: m6 a- [0 W! [1 N
  73. type+ ]  i2 l+ X! @7 _
  74.   IMMDevice = interface(IUnknown)  g  B: M* s. I
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    3 u; w( S! x: T+ |$ N3 F
  76.     Function Activate(  refId :TGUID;* u' ?1 O) ^$ @, P; b) y$ P
  77.                         dwClsCtx: DWORD;
    0 c( g' R. S7 t2 p" l
  78.                         pActivationParams: PInteger ;
    ; ?$ M6 S* z+ X* F( G9 s: ~
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;7 [: _% [8 K9 Y  f9 @- q: ]
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;1 ?8 G4 z% J: N9 B/ p% j
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    6 U" m1 W* u9 Q) W
  82.     Function GetState(out State :Integer): Hresult; stdcall;3 a5 R2 v! N4 I
  83. 1 a8 Y: l' g: ~
  84.   end;" C% f4 V) V6 b+ g4 Q# z

  85. : \. _' P4 A- }0 G& B, x. v

  86. " S( l2 O( c" R8 [$ b: J. w  ^
  87.   IMMDeviceCollection = interface(IUnknown)4 F, p8 U  O+ t/ T
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']; C6 I1 R# Q7 L' I. z1 h+ D* Q
  89.   end;9 r: S1 x' P& `6 T/ j5 g3 p
  90. % j3 |  m9 u' s( v, }
  91.   IMMNotificationClient = interface (IUnknown)* x$ o3 g* D/ Q0 p6 O
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']+ U" }( Y' p8 B% Z
  93.   end;
    5 M$ `8 r: E# U4 x. ]8 `. L* ~( q$ n
  94. 5 G# h5 }3 n; @
  95.   IMMDeviceEnumerator = interface(IUnknown)8 L9 {. }: v9 I  z
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']% C  U6 M5 L! z7 g) {2 C3 R
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    % G; h  [" O, A6 Y
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;; b0 \* L  W- m* F; g) O
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    - r0 |) g, N: q% X( k3 k
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    5 \, K" d# m8 e; x) V, i& t
  101.   end;- g) F1 X1 m  Y( o
  102. 0 w" K& R5 |/ }  g, ^5 r; l/ @. q
  103.   implementation
    - D; w* @: U3 _0 \' o# N3 u
  104. end.
    ; @+ P9 f, n+ S( N8 s

  105. . ?2 j$ d5 @: W. [/ T  s
  106. Thanks & Reagrds,
    1 o# [) {* {4 E2 v0 _' ?& f1 u
  107. Mukta ...
    & I9 ?% o- F% z# e8 p4 q
复制代码

  1. % n% @3 s. X# ?( K* i( h
  2. it's work in Delphi 7
    " L( z* {" q1 W
  3. //////////////////////////* \6 s- ~  N' v
  4. ' z0 a! K* j" G" \: @0 H' H* ^
  5. unit MMDevApi;7 q2 |8 a7 S0 i. p& W( Z. C

  6. ' u, R0 @1 E* I
  7. interface
    : [  u" `9 X4 e0 s# F; n6 B# z
  8. 4 C! D! ]* R- v$ r* x
  9. uses0 r5 H  n+ y0 d8 S
  10.   Windows, ActiveX, ComObj;- ?  ~. |. W" G/ V% J
  11. 8 L. A" g# N/ M( d
  12. const
    ' H: N2 x' _+ H. g! `
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    - d; A8 y- D7 P2 `9 M
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';0 _5 `5 L, h7 E) X, ~. h1 }
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';$ l5 Z) E1 m3 j4 E; V
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';) ?0 B' T) y8 h2 `0 y- ~* |
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';# Z1 h' r$ |, |4 c7 C9 o  O9 _
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';  p8 P" w1 G; F3 z9 T
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';# z8 M5 N8 l5 r) v. [! m
  20. 1 D7 ?8 Q- L  T/ l" j  r3 l; N
  21.   DEVICE_STATE_ACTIVE                   = $00000001;; @1 G) C7 H  {9 X
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    : |  i% O3 o7 B
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    4 v# E$ C/ w# F! Q
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    ( |4 {, j7 A6 [( O0 l3 [7 K
  25. 3 H$ V' s0 Y5 T' Y* G
  26. type' @) D" z. R6 ]  |
  27.   EDataFlow = TOleEnum;
    ! G& K" u( ?6 l. B/ E8 I
  28. 8 {2 S; P, @4 q9 Y2 p
  29. const
    & x% R. h+ x  t$ E; |, P9 @% N, d
  30.   eRender                               = $00000000;6 F7 q6 L0 h! t6 ?; b1 S) a$ z1 _+ Q/ \
  31.   eCapture                              = $00000001;. h) e- B; M, F3 Q4 v) H8 d
  32.   eAll                                  = $00000002;# w' r2 u$ L1 k1 d+ ?$ F" n8 M" r
  33.   EDataFlow_enum_count                  = $00000003;6 Y( C3 h4 w/ `' w$ x  I
  34. ( _5 W) O/ i5 ?8 h: `4 `5 m" v
  35. type
    % ?- ~& w: m3 i; z+ {0 _0 k; V
  36.   ERole = TOleEnum;4 ]1 [. u0 N- N8 e# p5 @8 m

  37. # K" t: R) ^2 H& O* K
  38. const
    7 g1 D) `( R- \$ P8 l' l/ v% q
  39.   eConsole                              = $00000000;
    * {7 k- O+ p3 Z1 z
  40.   eMultimedia                           = $00000001;/ \2 n; z, V: f6 M" c
  41.   eCommunications                       = $00000002;) D  y! q$ p  `0 A$ T
  42.   ERole_enum_count                      = $00000003;
    9 Y) [; v4 E, O* m5 n$ t
  43. ; m0 h  p6 T7 c  f8 I8 ^0 V
  44. type
    3 {1 W% T2 H, B2 R! x$ x
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    4 y6 Y. _' ^) p" X$ _
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']6 I  k9 X0 \  w* F- I! O1 M+ T' ^
  47.   end;8 Q) C% ^' a2 G7 j  I3 s

  48. 3 z! V$ `7 m# _0 P' U) _
  49.   IAudioEndpointVolume = interface(IUnknown)
    $ Z+ t8 a; ~+ m% I
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    % }! ~) C! A/ S# Q3 u2 X! ~4 v
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    + Q1 e. _9 V4 j1 Z
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;" I* [, W1 H5 |7 A
  53.     function GetChannelCount(out PInteger): Integer; stdcall;# H. B+ M: _" q' ^5 `" R5 D
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;) Q8 x, d2 H6 _( R* D
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    & d# a1 V) H9 z* d/ o
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;4 M  m8 W: e: r
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;( K! c* a1 g; d" Y
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;" k9 ?% w) e0 i4 ~+ x
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    # ]$ h, c: [- }8 _
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;) I, W# o# P5 L3 Q: G- ~. G+ @
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;$ D( `, V) W# v
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    8 O: [: r, P1 _' S$ O% M. d
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;( X7 m% x! n3 h
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    5 g! W/ G' |, ?1 d6 e! J7 ^+ J
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    - V1 X8 `7 u8 r  L- m  h
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;7 G6 h) r3 g! [: V7 M
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    9 |0 u5 M4 T$ c7 X
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    5 i! `3 S+ T" a: j6 [
  69.   end;
      C. A; ?# q% R( @" T0 q; M  R/ }

  70.   B- E2 {% |0 z5 H. t/ F1 l9 d
  71.   IAudioMeterInformation = interface(IUnknown)+ b& ^/ S5 B" o+ [
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    9 K' K% W: O" B4 |5 u1 t; ]' w9 l
  73.   end;% j, _- r2 Y1 H! j4 g
  74. / Z- b% f! a/ e& Y+ q, i7 ~9 J
  75.   IPropertyStore = interface(IUnknown)
    " s% E# U) x* O% j2 p
  76.   end;
    ( H, Z! G$ m% L) E

  77. 4 r0 }6 o! L+ d; |7 v9 Y3 |
  78.   IMMDevice = interface(IUnknown)& g% c9 Q& {% P- ~! F$ r, R# ^
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    ! G( i  j0 [& v( z) }( S
  80.     function Activate(const refId: TGUID;
    ; U- s% u: k1 U) ~
  81.                       dwClsCtx: DWORD;
    " A+ Y2 f: k# \  U
  82.                       pActivationParams: PInteger;! D9 ^, w: V+ v% k* b
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    9 }- {3 F+ S9 o/ c9 y5 s
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;+ j+ N) N& [6 M" z0 ^6 q, Q
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;, ~0 |! d6 H- q1 j
  86.     function GetState(out State: Integer): Hresult; stdcall;
    ! j4 [) o* A( B5 C0 q+ k' y5 K
  87.   end;
    / F& B( ]$ Y( o1 ]0 c, \% y( `
  88. : @5 W+ i5 m: Y8 I- N0 i$ G) W: y7 |
  89. 7 O- I$ c! G) C# K6 x
  90.   IMMDeviceCollection = interface(IUnknown)
    : p% r3 \* v$ \
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']7 t/ X5 D! D- j: I7 w5 X1 f0 b
  92.   end;7 M1 M& E* J- U9 @

  93. ; h  w, Y+ P9 g" h, t6 r; `
  94.   IMMNotificationClient = interface(IUnknown)4 H) L5 T0 [9 i3 o! A+ d
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']. t1 f; I% Q7 K% v1 Q& y
  96.   end;  ], Q! ^, ?( ~+ R
  97.   v+ a0 A  d2 \( y  W: o
  98.   IMMDeviceEnumerator = interface(IUnknown)  j- O4 j& i% r- p9 X) X+ ~: O
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    * W& t9 X/ p, Q. T0 X( v$ F+ O
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;, }' o; [6 W/ S+ i% V
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;! U- w% O" j$ n# j1 @" x3 l
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    , m0 s9 b2 [6 k0 L! ~: Q. p
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    2 k5 w% }1 x2 n+ q0 m) m3 z3 ^
  104.   end;
    * \/ V/ L) z0 `5 j
  105. ' u! }$ O- W- ]3 j3 H7 p  v) X
  106. implementation
    " d. H: Y! N( L' Z

  107. 1 T# W9 z. a# e, n2 M  C4 Z
  108. end.. P' N$ A" Y1 |
  109. 2 ~' w4 l0 g4 \, Z* h
  110. ///////////////////////
    ) x3 w% Y  h; Z
  111. simple sample :)
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  112. ///////////////////////' R+ y% k- Z) B( y3 \1 Q  \  @

  113. 2 V8 F# U7 M7 V2 P% z6 j4 |" h% C
  114. //...... other code
    + v+ |0 k% y6 g' b" A+ c7 n

  115. . f+ e  ^7 [& `0 }5 P
  116. uses ... ActiveX, MMDevApi, ...;- |* }3 u& t- `; E
  117. ' ]3 p# S9 T  Z
  118. //...... other code( g! R* F- K4 b1 [

  119. 2 @- r8 c& c5 c8 ?. ^& U6 y
  120. var9 t9 j4 p, f& F5 k6 [
  121.   endpointVolume: IAudioEndpointVolume = nil;
    ( U1 H# V8 s. B* ?

  122. 9 Y3 l0 Z; Z" a0 ?" t
  123. procedure TForm1.FormCreate(Sender: TObject);
    " J! a) |! u6 {" t: ?
  124. var
    3 V/ \1 ?4 s. b9 U/ H; [( q
  125.   deviceEnumerator: IMMDeviceEnumerator;
    : `4 E7 X8 b" a0 }" _- k
  126.   defaultDevice: IMMDevice;" A  r. h5 l* n  T
  127. begin1 S, O! v/ @$ i' K3 B
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
    / R0 K. e5 o- G, k0 s9 y
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);2 L6 L# x! v5 ~/ b2 Q
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);5 _0 T2 t( X. E# m* O% G8 ]+ E
  131. end;0 l: B. u8 t! a$ \* N' r" I
  132. / A3 Q- F, `* n' i. `5 t/ X
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var- e: `& a* B$ x7 h5 o  x2 h
  135.   VolumeLevel: Single;- o9 k: T  w' n# W* g( t; m
  136. begin
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  137.   if endpointVolume = nil then Exit;6 u, @% I, k1 K3 ]
  138.   VolumeLevel := 0.50;
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  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])
      \. ~  V% i4 w3 K/ f$ @; N& _
  141. end;
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  142. 1 @! `8 P- k( e. d$ G
  143. /////////////////////////////////////- v4 D# U. F. B1 a$ K

  144. 9 }' v  H. J  r( L* F
  145. // with best regards ToxicDream
      n6 @$ h3 T1 v7 Y: j! a
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