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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* \" j! X, W& ^- y' d( j4 W
By Mukta & ToxicDream
  1. 7 u1 m# r& r" O1 z" y# o
  2. //for delphi 5
    : M. J& L, Y, r- K
  3. unit MMDevApi_tlb;
    6 a) ~# D! E/ X: W4 r  \

  4. ; O6 }; i' r) r0 X
  5. interface3 ?1 [7 n4 H$ }+ ?
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;4 ]: e- M" X3 t( U8 D% g$ f6 L
  7. const
    4 o. _+ m6 z6 ^# G
  8.   // TypeLibrary Major and minor versions
    : z& c. g0 E/ G' A

  9. ) I% B/ W( r6 i' I: N& p
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    " D3 @. ~; Q+ ?# I2 w  g3 x& m* H( x
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';- c* x) g8 r3 }. V! D
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';3 _# h7 v1 o+ ~# N
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';6 v& r2 B" ^% I; Y* W1 S
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';% b5 y6 X0 t% j$ w& L8 F4 w; z' v
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';7 m2 S2 P0 D( [' L5 h1 d0 A
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';& \$ N3 B5 ^9 y; J3 L/ w

  17. ; w( b2 Z8 c2 t8 _, c5 `8 k0 a. j1 ~
  18.   DEVICE_STATE_ACTIVE                   = $00000001;3 P  V# q! ~4 Q
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    ; C5 i$ M1 f: G  T
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;  A. e, a8 r9 O
  21.   DEVICE_STATEMASK_ALL                  = $00000007;* m6 i" i/ C. Q! u# o
  22. 9 b$ d  J) z* S% x  X
  23. type6 [% T& h( k0 {( W, |% _: n
  24.   EDataFlow = TOleEnum;9 C2 E$ R7 k. N* \. O/ {2 A
  25. const* h6 ~6 q( e2 H* F
  26.   eRender                               = $00000000;( P& i' F% W+ l3 _* E
  27.   eCapture                              = $00000001;
    4 i% j' E) L8 Z+ \7 I4 d3 Z
  28.   eAll                                  = $00000002;
    . e. g' I5 Z2 K8 s% K
  29.   EDataFlow_enum_count                  = $00000003;% N8 M( Q8 A& z

  30. 9 ^( @& y- D! D. ^: m6 k
  31. type
      `) H, o* R: b( B0 x+ j2 ~
  32.   ERole = TOleEnum;
    4 s8 q" D, v4 k: F/ l. j
  33. const# ]% W" z2 z0 b4 [/ |/ P& y  |
  34.   eConsole                              = $00000000;3 L% N' k- V, H! M) b0 v
  35.   eMultimedia                           = $00000001;
    / u3 I' S9 N: x. [0 S) ]* a
  36.   eCommunications                       = $00000002;
    7 F6 N/ n2 g8 y
  37.   ERole_enum_count                      = $00000003;
    3 ~9 {1 e* K; u  m' w/ l0 q; a' u/ T
  38. , {; `2 O( `  W% k1 ~
  39. type( u# d4 o1 g2 d3 f. e
  40.   IAudioEndpointVolumeCallback = interface(IUnknown), O! f( `8 r9 x! U# m% c7 s
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']9 h" g' I' L4 Q, b6 v+ b! n
  42.   end;+ K* A2 I& T' v: I8 n" F+ `# S7 J8 Q
  43. / E$ i/ C' Z- a. L& e* i. Y
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    " N. W  z# O: W" N  v  V6 W# d
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']' Z( p) I8 l# H* w/ f
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;$ X1 a7 I* k$ @! d2 r
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    4 B, F1 T; s$ z$ R9 W5 k$ o
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    ; E3 p- m+ e3 [5 H! e
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    $ q7 A* A( R3 |: f+ |
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ) P9 [+ E3 N; Z( J) s! H: r5 l
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
      m7 e1 M/ f3 M
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    . g4 [6 J) e4 [8 Q* U& H8 i0 l. c
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    7 r" B5 R( `3 `7 Q$ d
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    9 R  {# j2 v2 G
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    7 L' [- ^: ~6 h% ^) g
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    4 {; r1 L. d# D6 i; ~
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    # d, C/ `% C. P2 N: q& H
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;0 O- `( _6 D4 V+ P5 l' ^
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    4 T$ C0 Y4 ^: G6 K0 q* O5 o4 K) I+ g
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;9 W2 n2 ^; v. D6 O8 W7 l
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;7 s9 x% X1 u6 n9 q4 c
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    4 g- u( [" Y" m8 G/ [; [# L
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    / Y" ]6 K  U% s; x
  64.   end;
    + M# [9 g$ f- c2 j* z9 J6 P; o
  65. " F' c, l6 m- M- d4 v( C
  66. {  IAudioMeterInformation = interface(IUnknown)) e6 \# p8 n4 J' ]' j: z
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    8 B2 I/ R  N/ H/ l
  68.   end;}
    # I! E* G# x% D0 B

  69. ( I7 Y, T- S$ a5 q" M
  70.   IPropertyStore = interface(IUnknown)& \5 \- W( e' \3 d2 w* G
  71.   end;# T- c( W' S2 e# ?3 f

  72. ' G  X, \; K  Q+ P2 Q
  73. type
    , p8 ~7 v( z% b  d5 P. ]& N9 g: n; ?
  74.   IMMDevice = interface(IUnknown)+ f* G( `! \2 r6 p; _
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']7 W1 W: @& }( u
  76.     Function Activate(  refId :TGUID;
    + ]% |( i+ R8 Q  m: Y& w& C; n
  77.                         dwClsCtx: DWORD;
    6 b7 u5 f& K: ]# g$ Z3 E
  78.                         pActivationParams: PInteger ;
    - z% ]2 Z4 R" W2 e6 u: w0 N
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;$ T8 F) l  x' @4 |, x
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;, c+ a3 B1 R7 {" e" O! B8 T1 V
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;: Z" m5 C2 j& I8 W
  82.     Function GetState(out State :Integer): Hresult; stdcall;9 u. g( ^( B" \

  83. ! T. Q1 D# d# q" D/ b& J  U+ e
  84.   end;
    / y* {1 P0 S! I9 [4 H

  85. * f5 G7 P- E% S. v5 j

  86. ( }3 a8 M6 ^$ b1 A: P! i
  87.   IMMDeviceCollection = interface(IUnknown)
    : g/ q/ S( k. ?
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ( n1 E3 j6 s, x( F6 g
  89.   end;' J# M4 p9 M' @/ d; M: p( Y
  90. $ L! Q+ ?2 m/ A7 f% {6 j
  91.   IMMNotificationClient = interface (IUnknown)
    3 ^/ A- q) [* H) {8 f* ~
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    2 f1 R$ t1 E1 F& Y( G/ ]9 y) c
  93.   end;
    ! j. Q4 K+ G( e

  94. ) c1 x( f: X, \
  95.   IMMDeviceEnumerator = interface(IUnknown)
    ! A0 S" X1 r. ]% `! e
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    % O! ^2 G% ?/ r
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;1 O/ V7 K% a$ J4 w
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;0 }& f2 v+ l6 H8 }
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    ) K: G; @7 z5 }; _) M9 C
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    : b8 R) {  S1 G6 F. ~4 X$ Q
  101.   end;3 K7 w* H, O5 c3 `: G
  102. 2 `  N. ?' i3 n! k3 P
  103.   implementation7 @7 s8 `' o, U
  104. end.% E) l% k" s) P
  105. ' I! B* F5 p' v" Q' p
  106. Thanks & Reagrds,
    * m% L2 w4 D# f, s6 d4 `; e
  107. Mukta ...& r( t& s9 A3 ^/ Q
复制代码
  1. / p; Q, G; }% T7 W
  2. it's work in Delphi 7
    9 i' D. {$ C5 x  I9 ^
  3. //////////////////////////
    0 R* b# A! T8 d5 F( `! {2 E4 F
  4. 7 [! g/ T1 f, P: W2 U% b/ R
  5. unit MMDevApi;, P8 y! D+ ]/ V

  6. 0 w- g5 c, n% \  n
  7. interface
    & K# i2 [; W2 ^) }" p

  8. & \0 y' ?1 Q" V% n+ P
  9. uses
    & D& b. F, O9 ^" E" p, p
  10.   Windows, ActiveX, ComObj;8 ?3 ~) Z6 w' a

  11. # D" ?5 m5 O" z! v% C
  12. const6 I( u$ _/ F, e* ~+ [6 B! i+ I
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    ' P2 V' k' [: T! w, D3 ?2 e
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    2 j* _/ p6 G+ A; ~+ M; h
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    : Z. p5 h( X# L; s
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    9 d6 N5 _; C" Y6 |8 Q2 k
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';6 Y2 \* e7 i7 g/ u( V4 w
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    ; S& Z  r% r6 o3 |: e# ~
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    2 O3 D0 T, f7 V3 G% r& d- y3 K: W8 [

  20. + k* b6 i3 R' p' W4 A) P' g- E! E
  21.   DEVICE_STATE_ACTIVE                   = $00000001;% H+ `7 x5 e. ?* {) @6 _' F! k/ k
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;, w- O. A; }5 M5 I' Y& A# c" C
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    8 i8 h# r, u* c, Q
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    $ m; w! d& o2 p+ O9 i
  25. 9 y0 C$ }% _# v5 Q
  26. type- `  W& Y6 ~+ @  r
  27.   EDataFlow = TOleEnum;
    2 m# q) B* v3 B0 C

  28. - n! y* V  v+ q$ h' \; X) I' j
  29. const
    0 p* e6 \% m  H0 }
  30.   eRender                               = $00000000;+ [) V& b- S) V4 @9 ^/ w
  31.   eCapture                              = $00000001;! }1 x! D: J5 n4 [1 o
  32.   eAll                                  = $00000002;
    0 O- H7 L$ M/ r6 K
  33.   EDataFlow_enum_count                  = $00000003;) y8 o3 B* ~0 ~- @$ L. _+ Y! h

  34. 3 `9 ?' B1 B3 g, b7 F/ o- Z$ i- }/ C
  35. type
    + K1 {' u- k6 Y! H3 u( E
  36.   ERole = TOleEnum;
    4 L! w( L3 g! e8 s% W+ |0 V
  37. : p6 B, M7 I5 M( Q
  38. const
    ; Y3 N: J1 P& Z/ v
  39.   eConsole                              = $00000000;# s5 l0 ]- z! ^. F8 R, C
  40.   eMultimedia                           = $00000001;0 Q4 Z2 K; T6 E/ p+ {
  41.   eCommunications                       = $00000002;+ t+ i# y5 u2 e* ?, b' b3 b6 y9 {! Z9 ~
  42.   ERole_enum_count                      = $00000003;3 U% h% F) R0 r+ I" m/ g9 A2 Y
  43. : I. X+ v  T; `. _
  44. type5 ?0 c0 |: d1 B0 X
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)1 P1 E2 r+ o& G: y6 W
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    1 ~" g$ F( t  O3 q9 W4 O$ G
  47.   end;
    . b6 l' y0 a/ b0 M4 c

  48. ! W& X1 |  B" R& B' r) z
  49.   IAudioEndpointVolume = interface(IUnknown)
    9 F" I" I9 c0 }$ `; j
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']; O7 Z# x% e6 r: _0 s
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    . L& |! B9 G' {& |) m* Q' B
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ) c, j. g! d0 D4 {' @2 r" a) D
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    2 }8 K) b( H* `* v" R# r" x( D
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;6 V. P) f/ m6 f' Z$ u9 W
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;$ {% k5 a* d& Q6 \( e1 w
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    ! O' U8 b! n) r$ |2 f1 O' F+ D
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;# l( K0 Q& D9 y7 V1 l4 s" R
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    . z5 X% z/ C8 `( D+ k
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    8 b- ~7 f5 y+ f) ]/ r8 W1 Q& g
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    5 L) u8 x2 a# c3 S  ~, ]
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;8 e3 w7 @4 F- E4 n: a, R1 G" ]4 b
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;' }; Y( g  U! W7 {1 Z
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    ) _( n( B1 f/ P  ]& m2 B, z
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    ; c5 A% u$ a! u2 v1 M
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;& _- ]7 e; {9 q/ y
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    1 L( }+ m! v' e* s6 n# P8 g& h6 r
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;# N; i. ^% J. ?7 h7 C
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;  ^" F2 T) [7 A6 m: p* w
  69.   end;
    1 Y% F& j' I$ [) l, `+ ]

  70. " _8 u! w/ z8 R  i, D$ o
  71.   IAudioMeterInformation = interface(IUnknown)  c* ]2 K- B7 `& u! M
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']. }& G; V7 @3 x, {
  73.   end;
    : L7 Z" u: |2 q8 y2 B' g
  74. 9 m" y  L& Z7 k
  75.   IPropertyStore = interface(IUnknown)
    ! }( L5 t6 v7 Q
  76.   end;6 H1 U0 e5 V5 \/ T+ J9 E1 D" u, X
  77. . a& x) J" T( x6 @$ c
  78.   IMMDevice = interface(IUnknown)
    9 G% L& C4 Z+ o8 k  |" e
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}'], j4 ]% }" {- g
  80.     function Activate(const refId: TGUID;" h' C- }& R& x* }% V
  81.                       dwClsCtx: DWORD;1 I% k& p# `* S3 S
  82.                       pActivationParams: PInteger;
    5 C2 L! i; _4 v# T' J- q
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;) l% i0 m: b& u. ~. g
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;5 I1 x# O+ P% k$ S" W2 B9 g
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;" ~+ U/ w+ [% w/ l7 K
  86.     function GetState(out State: Integer): Hresult; stdcall;- Q3 h5 x6 {; Y4 y% \& w
  87.   end;$ \. n4 X9 a' m

  88. * T5 E& I( c' R0 Q" q4 W2 e. z6 c% _
  89. & A4 N5 ~1 F7 K4 k1 F
  90.   IMMDeviceCollection = interface(IUnknown)
    . P5 H8 [. M5 `
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    + h. Q8 W  k! N# W. v! |
  92.   end;- N7 a( b1 v4 v2 B
  93. / M9 ~; g1 S$ m: ^' G
  94.   IMMNotificationClient = interface(IUnknown)
    + `9 N3 x0 k; d( f2 ^
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    , |* h9 w8 D/ E) `  ^
  96.   end;/ v7 L( s+ M* |5 p  `; O# a( F

  97. & @, N$ m: D3 L# S  Q6 M( G
  98.   IMMDeviceEnumerator = interface(IUnknown)
    " r& n# q& T; P
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    / O/ }% U. o7 j1 j9 U/ n# e' e* S
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;+ y- E9 N( B. _) W" d0 Q! S7 j
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    ) h& ^7 ?: I( H0 A9 U9 ?2 a
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    * [* F9 X1 e5 I& T
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;- ?- {5 V' B4 P* b0 s! O
  104.   end;# u* ~7 c8 I* `2 L, _- |2 g
  105. . }) h) O& G  g3 R; P2 q) q# D
  106. implementation( m& s" Q4 W) H/ D) o
  107. 8 Y7 L$ `+ A, P5 t$ d' m; E; V2 Z. n
  108. end.
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  109. , {1 Z4 W; Z' h; d% t
  110. ///////////////////////& Y- _: P( a! c" s
  111. simple sample :)4 e  k0 w. H! t# R% A
  112. ///////////////////////0 q* B6 E- p5 l$ W0 }# V+ x
  113. 2 w" G( n5 |& F+ ^; }
  114. //...... other code
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  115.   x& ~: t3 r7 w& [. R( v% R
  116. uses ... ActiveX, MMDevApi, ...;, N  `5 K5 f( @, j: U5 e. r
  117. 3 c# U4 g7 l# I7 k! |! F
  118. //...... other code
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  119. $ `' p# |  S0 d6 p
  120. var
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  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. ; E/ V) q0 l# z
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var" g# n2 k0 ], K3 M0 n
  125.   deviceEnumerator: IMMDeviceEnumerator;
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  126.   defaultDevice: IMMDevice;. X- ^* @3 P, r
  127. begin
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  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;% ?; g$ L5 t5 N- }3 r- Z

  132. ' ^9 q" B' k+ M: x* k7 k& X
  133. procedure TForm1.Button1Click(Sender: TObject);
    ) x% {/ c, w- _7 I
  134. var) D. V& p% X9 q+ J, m7 e
  135.   VolumeLevel: Single;
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  136. begin
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  137.   if endpointVolume = nil then Exit;+ D1 }& c1 P* a6 S0 u9 @" C
  138.   VolumeLevel := 0.50;4 W( i  X8 k: j! f2 b8 H
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);' h0 O. }7 @; P( N" I
  140.   Caption := Format('%1.8f', [VolumeLevel])5 R& `, I3 f* Q7 p1 |
  141. end;
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  142. 5 j& X8 a8 S' k! I) T* w
  143. /////////////////////////////////////6 C. _& ?" D9 v- S0 D" ~7 T/ y) v

  144. * b% w, j$ k2 x% a* y3 K7 V
  145. // with best regards ToxicDream
    # h7 ^0 \- [8 A0 D  o
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