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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' @6 n' x$ Z. i- a( b- w
By Mukta & ToxicDream

  1. 3 ~  i, `; T5 K/ H
  2. //for delphi 55 y' w. M' ~; Y% k0 n
  3. unit MMDevApi_tlb;
    ' X6 O2 \, o8 {8 z

  4. + L+ r: y: w2 i% O& C& G
  5. interface8 o3 f) [1 F0 J, y& S4 j
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    7 `2 A: R6 p3 s* H: _- c8 q' \8 K
  7. const
    * i/ O9 ^- R) _0 Q4 C
  8.   // TypeLibrary Major and minor versions5 q, B2 H' Q3 X. s+ p- p
  9. 6 a0 L, C9 \" F# _1 P0 G
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';! G4 r- U9 o2 e  X& {0 c& P$ a5 v
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    & a  q, _- {5 B, m$ m. R
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
      y8 z' |" p/ J( i0 J' W
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ! }/ {' ?/ i( M6 a  l6 z6 b" }6 X; g
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';( G- w2 V: l) l8 Q
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';2 E  Y4 W5 E7 V# d, U) y$ }' r* S
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';4 ]9 B4 r, Z/ B( C9 l
  17. 3 L( f. b3 D0 l+ I  T. [
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    5 c( [7 H0 b9 F% ^7 q" u" f
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    7 ?3 _1 q* H1 C8 E6 _! `
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    * l! m/ Q9 {9 m' E2 r9 y" m$ F
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    - M; U7 Z# D, t8 C

  22. - q; p6 i6 C8 ?7 u5 P7 t
  23. type$ Z3 @  s( `% P+ G
  24.   EDataFlow = TOleEnum;
    ! P9 ?+ f1 R$ J0 O$ Z
  25. const0 t1 l8 g5 H: ~! p" [$ `& P
  26.   eRender                               = $00000000;
    ' j: }% {* b' M- z& {# `3 r3 w# y  |
  27.   eCapture                              = $00000001;
    + G$ o+ a( u$ ?+ i1 S
  28.   eAll                                  = $00000002;
    9 q# ~1 p6 t* k# X. a; A
  29.   EDataFlow_enum_count                  = $00000003;
    - e) S$ H5 S: Q' T7 J
  30. ) C; K; S& O  c/ Z8 T& j
  31. type- X+ y( {: R, t8 V+ Z8 z$ E
  32.   ERole = TOleEnum;
    8 H& i! R4 f: ^9 _7 _, ?# b$ K
  33. const
    4 I$ l: S; X" ~5 S# W" D
  34.   eConsole                              = $00000000;! X6 ~5 p$ G9 K; F
  35.   eMultimedia                           = $00000001;  }; j! c+ ~# i7 U: G& O/ Q
  36.   eCommunications                       = $00000002;* n  i. @2 ~4 d5 q, f7 p, R
  37.   ERole_enum_count                      = $00000003;
    : S9 M' H0 `# D4 a

  38. 1 Q* v9 g% \) v0 U
  39. type
    9 k0 J+ m) H8 T1 l5 @
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
      n$ y; S9 k6 Z4 G5 p# h
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
      F9 x( e4 N/ j% l  G& {( {7 A& f
  42.   end;- l! j! F' t6 T

  43. # w& t8 v* ]2 m5 s3 c6 I
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    / G$ B, U, E' u$ S5 K
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    ; D" ^( E/ }8 n% i! a& z6 O
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ; m9 W8 a& }0 I5 }( V6 a7 B7 A- A8 j
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;; q4 N) P' M) F7 N' _7 a6 i/ |
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    + B4 X3 A$ C( ^3 M) @2 M
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ; ]3 E$ a: P: G! p' X3 f
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ' u, A; E4 w% Q. ?
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;6 x( u- S% G' I# I& f! \
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    , h% w; n- i, b1 S& I! Z
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;4 }% S' C; _% @2 j& `
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;$ Y5 |" U9 _# {# O! y' w
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    1 {, T/ P% k8 p8 k. H; Z
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;, O  l& x7 M5 p  |3 a2 }/ \
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;4 {/ @* d% H: F
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    / M: M. G0 q" S2 q
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;' U, m: e+ r9 Q- v
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;# P# H4 r& d6 v0 \8 t$ B, I- M& C
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;7 B  M9 ~8 Y/ D; l$ w- _; e1 g
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;0 c1 _6 L0 `% V$ W' u* H; a
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;6 y# u1 m" ^) z2 ]" C
  64.   end;: N) p( I) o% i# A
  65. " h/ x. s! M% Y, E4 g8 G
  66. {  IAudioMeterInformation = interface(IUnknown)# K" K; s8 b, H: A/ E9 S$ A
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']: |/ y: L# C. @: q5 U6 B
  68.   end;}. g% v" b! ?( P4 q& @# u6 M* T5 u0 g
  69. ' p' Y$ k+ b9 I
  70.   IPropertyStore = interface(IUnknown)
    4 O6 l- r2 R* d: U+ V: _
  71.   end;
    / D# M: x# j0 u$ E8 [+ ^( S; p0 h$ z  V

  72. ' U: @& O! `! a2 v) K! @5 w
  73. type
    " _, V: A+ h  d4 m
  74.   IMMDevice = interface(IUnknown)
    $ @! V! b- c- {# E: f
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    ! H' j- T; S- \* |9 ^! x
  76.     Function Activate(  refId :TGUID;
    ! \" N; s5 e: ^, g2 l
  77.                         dwClsCtx: DWORD;/ }+ s6 X! H3 ^
  78.                         pActivationParams: PInteger ;1 j; [% K) r! B% [. y
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;7 ^9 Q# O) D# [6 J
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;2 o$ H6 S$ ?& I' I
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    ) l2 P, M, V$ F/ w. V0 K; }
  82.     Function GetState(out State :Integer): Hresult; stdcall;& l$ P: y2 G5 |. y/ M8 k
  83. & \* H8 N% X3 ]% x! x3 g4 R1 i
  84.   end;$ t5 z( T/ k) N! |& c! E9 r

  85. , y2 {8 M2 S5 I& E

  86. # m; b  g, m; o3 S# \# D
  87.   IMMDeviceCollection = interface(IUnknown)- i, m0 L* k( _, d  r1 `
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    4 D* A  t7 T& I: T
  89.   end;
    - h3 ^( i* W& b
  90. ! M5 z. Y" ?. A, w
  91.   IMMNotificationClient = interface (IUnknown)
    3 e; a/ \8 T4 [) f1 {% R- z% j, w  t/ P
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']4 R* Z" Z8 _' h$ b/ ^) B
  93.   end;
    : G) {% a, Z7 U5 F
  94. 3 ]1 l' [, c% c' z* q3 n& b/ [
  95.   IMMDeviceEnumerator = interface(IUnknown)
    ) q5 R% d1 w; K) e; S8 ?" H
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    9 D2 z! U# e& q( o6 ~. i/ K
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    ! g) ?# G6 h) r8 C1 n; q& [; X
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;2 i. I% X* c9 n# p5 G! ~
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;* v3 H$ }% ]- m$ i
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;# M0 v9 Y$ o4 p6 a" V
  101.   end;
    " ~% p6 p" O0 q$ I; i, M
  102.   m6 B, v* B+ R8 O" P
  103.   implementation
    ! ^$ O3 @/ k* c3 Z" z. d
  104. end.
    9 i% x4 t7 U) h! O* K8 X& q  d$ Z) P

  105. ) u2 g; \0 w# N* K
  106. Thanks & Reagrds,
    2 F& N: D) h( I
  107. Mukta ...
    9 S" V6 t, G$ r8 q! @4 y
复制代码
  1. ; N+ S4 T5 J% C& s. t
  2. it's work in Delphi 7) p+ q* i) j/ s' ^2 s# [# J
  3. //////////////////////////# _/ j- e4 `1 ~. a8 c
  4. 1 `9 O2 v% V1 [$ O9 ]/ o
  5. unit MMDevApi;8 A6 s. P0 z) }$ q3 e; ?
  6. / K/ L8 t5 W+ h/ ~. N) V1 D# |
  7. interface
    / S% @  k! b+ V5 Y) ]
  8. . F! i3 l# c5 }4 h
  9. uses2 {# n( ^9 @' x$ R  p
  10.   Windows, ActiveX, ComObj;4 G% K$ p; }0 n" G& b

  11. ; f8 A. L+ D4 v( E( ~' ]4 C+ }
  12. const; ^! \; }7 @; z1 s' g
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    : Q& L0 D5 z% E3 f1 m) T+ @/ Q& z
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';/ F0 d% p* L5 c5 M6 ?7 Q
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';. a2 Q8 L8 a( {7 o/ @
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    , P6 w, @- D+ e* U- J/ S
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    4 r3 D' T1 }) f% ?$ U: D
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';* h% j5 R3 Y8 J; Z7 T6 M
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    ; e0 t! F5 T) q+ ?, G
  20. ' ?2 ^, ?1 {% G5 s. g
  21.   DEVICE_STATE_ACTIVE                   = $00000001;' @  m& t( \) g9 i( _
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;5 i5 N/ o" f: w" E! ]: b& G2 G* F
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;+ [. I/ R/ {/ j$ Z5 z8 S; p* _
  24.   DEVICE_STATEMASK_ALL                  = $00000007;* Q0 z: }7 p2 b% w! A$ T9 W

  25. 7 A' Y  q( b) w- {
  26. type
    8 N# z5 q9 |6 b  Z! U; L/ x
  27.   EDataFlow = TOleEnum;% s, a( G5 E8 A, C; h  p, q

  28. 6 R" u, b/ U  ?
  29. const
    # E, R2 h7 U+ e+ I; {8 U, X5 Z& z* H
  30.   eRender                               = $00000000;
    1 Z9 \' f, f/ c& |3 j6 P3 F
  31.   eCapture                              = $00000001;
    6 @4 p7 h3 k2 P2 B9 I2 O& u
  32.   eAll                                  = $00000002;
    8 r/ f0 Y7 d# j
  33.   EDataFlow_enum_count                  = $00000003;
    - [& B) g5 S/ V+ r3 w5 }' W+ g: S
  34. 4 X( G" s% ?; b, n
  35. type$ @: v# O! F2 N( J' u
  36.   ERole = TOleEnum;
    # X' D$ A5 \! n: w! G2 U  W1 j
  37. 6 u2 @$ P; z, w6 _
  38. const
    % Q' ^- f* F1 _' @$ x) h# ?) J
  39.   eConsole                              = $00000000;5 c; U& C$ N8 i: a3 ~, r
  40.   eMultimedia                           = $00000001;
      D; {4 I8 P9 e# e* A% p8 r
  41.   eCommunications                       = $00000002;& v" N5 k, X6 Q. h7 \
  42.   ERole_enum_count                      = $00000003;! Y$ ?1 _7 d* w7 |/ [, E
  43. & X, s4 E7 e3 b) ~4 [
  44. type* X' t8 l# T0 e" U/ `' E
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)5 ~7 ^5 X5 \! Y2 X" B/ c8 s
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']) n' r6 k4 h1 I& Z* O
  47.   end;
    : R4 M5 A( b9 {+ w& ~- Q

  48. : R6 P* n. j( Y5 u. n! Y3 u
  49.   IAudioEndpointVolume = interface(IUnknown)
    4 n! ?9 c! L5 W  _+ U
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    - i/ {9 Q9 I- X, E8 Y
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    2 d1 o7 \4 \5 ~, O/ p4 y
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;# D) Y7 [$ X9 f  q( y
  53.     function GetChannelCount(out PInteger): Integer; stdcall;$ S  r1 b0 x6 A" B  Q) d8 V& J
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;% G, j6 A0 T  H, P2 f
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;% N+ O2 a! \! L' ?
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;& U! U2 \/ T- B
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;; K  T$ ^# A, E- z
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;- C& O* H( r. Y# B9 h3 Z/ ?
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    9 J1 O! g0 _0 G" Q, B# f! t# e
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;4 E, l/ T% c1 V  P7 M* D5 M
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    * _, q% E- d. A4 X: s8 U. `, X
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    0 g" H6 l. w( ?% b
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    % r+ A" D, n) D1 v% Z) W% v
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;+ {; x! v  z( U6 }3 h5 W* B' }7 Y
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    ; L, J! s, o+ z9 `6 z6 w' X
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    5 j. S: |! K* S9 |5 c7 W9 B
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;# `  M- I* J2 @! b( B3 M) d
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;1 F" q. ~/ p  m! B1 c5 r4 G* I
  69.   end;
    + O1 e, g9 ?. i8 w/ Q8 A
  70. / {# K5 M& {8 @% ]( g: t
  71.   IAudioMeterInformation = interface(IUnknown)
    8 g# H3 z2 x( m
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']6 N2 I5 \( K: _! R# H0 g
  73.   end;
    , k% u5 l/ n! V0 f4 \
  74. # ~& V) J5 Z. ^  i, A) t
  75.   IPropertyStore = interface(IUnknown)! p- d' l2 Z* c8 s: r5 f) x0 \, Y, {
  76.   end;
    0 }7 M9 o$ c/ _6 B3 F% N' L
  77. 7 U4 _5 g1 K1 f+ e
  78.   IMMDevice = interface(IUnknown), Q% u, p& ^" {! t7 h
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
      n* D3 T: O' p$ {' g9 S
  80.     function Activate(const refId: TGUID;6 x/ G# J9 {  S! \( [
  81.                       dwClsCtx: DWORD;
    " o3 Y0 v5 i0 W) m4 @
  82.                       pActivationParams: PInteger;  o8 s) a6 K, C+ r% p" q
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    : w1 m0 O* ^9 s! O) Z
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;) b2 _: v; m5 B7 G" g" a0 W: H
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;( w. d8 n  C2 L7 Y7 q* \! m' Q
  86.     function GetState(out State: Integer): Hresult; stdcall;7 _# f' t& n8 W
  87.   end;% h+ ]7 s; d9 ]6 t' b6 J7 v, x- u
  88. 2 z2 F, M; N+ ^  b/ j0 O0 c

  89. 1 K2 z4 @# d' S* Y6 S7 m/ a. z
  90.   IMMDeviceCollection = interface(IUnknown)
    8 o* }5 A' V' z5 c. J9 L) K$ r, L
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']8 @4 e* S4 D+ D* h
  92.   end;
    4 T" L9 k, z6 b: F3 j3 S

  93. , S1 Q5 n  m) U% w3 ~2 I
  94.   IMMNotificationClient = interface(IUnknown)
    ( Y1 R" }7 t5 c; g
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']: Z! [# x+ N2 _& T: |( B) c0 s
  96.   end;( x- K2 T" [9 d% k) K% `+ J
  97. ! |& A. `7 h* S/ F" M* Y3 f
  98.   IMMDeviceEnumerator = interface(IUnknown)
    ) V7 F  ~3 B2 \: Z
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    ( o3 U7 E( r9 o. \; z$ w
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    + W7 s% i# N4 J0 P4 \' j6 s
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;' V  h5 C) w# j$ a; ?
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;' x2 U& y( [9 T4 @, g
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;+ E$ J  I% }" Z
  104.   end;
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  105. 5 }3 G1 _& P- e2 L7 j
  106. implementation& `* t3 ^! Y. _8 _
  107. % n, T5 K7 b0 V& t& y' w2 l
  108. end.5 T. w4 f3 N3 ?

  109. 3 B# y' I9 {1 P. k. U. o9 b5 Z9 z
  110. ///////////////////////
    $ C4 n' g6 v! s' M# w2 p
  111. simple sample :)
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  112. ///////////////////////
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  113.   U( K) i$ Q7 }" E
  114. //...... other code
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  115. % W) t2 P+ M* E6 l# F2 o) z
  116. uses ... ActiveX, MMDevApi, ...;
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  117. 5 {$ L# t- N7 I
  118. //...... other code
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  119. 5 b- n$ }& M. G: ?2 B
  120. var" }# g; R/ l! S# t
  121.   endpointVolume: IAudioEndpointVolume = nil;# C% w4 c7 C2 a2 }, F; l9 ~6 @0 K

  122. 8 C1 e& p3 k$ E
  123. procedure TForm1.FormCreate(Sender: TObject);" d$ n; g* H* }( P
  124. var: ]# h. X* ~$ E9 c) I. @2 x2 f
  125.   deviceEnumerator: IMMDeviceEnumerator;
    ; i# m) q' M! }0 y8 @
  126.   defaultDevice: IMMDevice;$ Z3 t4 V% g! X0 J5 E# K/ k3 W
  127. begin7 J( Y& [4 h, B: B. ^' E
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
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  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);' `( h6 ^2 X& y" o- o
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);8 S8 ^$ _# n4 ]; j7 n1 O
  131. end;# [/ e- r$ P- \- R3 Z6 n( H* p/ U' d
  132. . |7 }/ z2 G' y0 m: P
  133. procedure TForm1.Button1Click(Sender: TObject);
    * B) {# |/ Z" i4 \
  134. var# Q; Z  l$ n% U$ a
  135.   VolumeLevel: Single;
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  136. begin+ j8 l6 F! K' q
  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;
    + Z1 V! c8 Y5 [: R& _, Q
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])" [- I: M; l% h5 q" O6 c. [) J  l
  141. end;- ?5 H' S/ o' X8 L" q
  142. 9 ?; w9 N1 F( p2 ~- ^; i7 g
  143. /////////////////////////////////////3 v, _% P% }9 d+ M! Q$ C& |6 k! ^
  144. 6 Z7 |7 o- p" L! w7 g0 D
  145. // with best regards ToxicDream
    6 F" G, o- H3 X8 S- d6 }
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