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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
# t& r: }! O' A% p* @+ e: eBy Mukta & ToxicDream
  1. " z0 M; I) s$ A: U: U
  2. //for delphi 5# e0 E* J7 l6 K: Q4 G# N1 I
  3. unit MMDevApi_tlb;
    . [8 k+ K, I2 i, Q7 C

  4. 2 B  G: N; _) A) {
  5. interface" O; q* {) }. l3 N5 M
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;# V/ b, }3 k, [' B
  7. const
      k5 F7 S5 R! A* M' B" y/ k) A: V
  8.   // TypeLibrary Major and minor versions  w- ?* ^  W$ G. O

  9. 9 }- R9 O: Z& M3 V/ Q, Q' Q! k
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    : U5 K& f- L3 o+ F
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';+ T, `; \% H9 R, Z
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    0 b, E; E6 Z/ Z
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    0 q" X8 d5 J/ S
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    2 E& T0 ^, J# B
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';+ a) Q+ s/ m* O# M6 L! y
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';) J3 [0 S/ Y5 L+ Z$ m) a5 W6 R$ x

  17. / T, V# w+ C: v7 e. Z4 H( F" G
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    % l5 G/ n5 r4 L- @9 k
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;* F+ H5 D2 \# h. W
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    # E2 t& g' l2 k! v' B; |
  21.   DEVICE_STATEMASK_ALL                  = $00000007;- s9 a/ c9 l9 s  B/ T7 y. t% ]3 s
  22. ( U7 ~- i5 ?9 o0 i5 u
  23. type
    * v( A* V- A+ ?3 a
  24.   EDataFlow = TOleEnum;
    ( Z1 p3 i7 [9 b3 n% R
  25. const4 @, F) S/ _8 j+ `* k6 J& ]4 ~
  26.   eRender                               = $00000000;* }: j2 D! x% w5 U
  27.   eCapture                              = $00000001;
      D6 W' z7 g% J
  28.   eAll                                  = $00000002;
    . V" E, \2 S! B4 p
  29.   EDataFlow_enum_count                  = $00000003;
    " i/ K" H& Q; B: J
  30. 6 H( y+ C4 M0 _8 K7 @
  31. type# q! J2 v+ Z7 }- ^; B
  32.   ERole = TOleEnum;
    / X3 A" ?/ k  b" g3 @: g. ?" Q
  33. const) c7 S" c% M9 v
  34.   eConsole                              = $00000000;
    0 S7 h* q* W7 l; ^. D9 D
  35.   eMultimedia                           = $00000001;
    , v; k4 W0 k0 W
  36.   eCommunications                       = $00000002;
    4 z# C2 M* ^5 }, V5 D/ x4 x; t! U
  37.   ERole_enum_count                      = $00000003;
    . h1 t4 v) a3 ]. z( _7 F# ]
  38. ) f0 h. g% g+ s1 v5 B* k3 p# j
  39. type
    ' W( [( Y( d+ B- z' R3 z
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)3 }" ~5 O0 C/ r$ }: K* G' V9 \3 X% C
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']0 ^0 h. H% ~- b) G* N8 ^- u4 \
  42.   end;0 ?8 u6 }9 l- c2 ]+ Q6 Z
  43. ) B( ]. Q, I% |8 y. y5 I7 b
  44.   IMMAudioEndpointVolume = interface(IUnknown)
      g  b" C0 G1 Z+ O9 P* A: u
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    7 d* e+ G; s6 t* F1 B! g
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    9 M8 O2 c# y2 a0 z6 ]: z- x
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;2 a3 o0 u/ {* Y+ I- {, W+ D+ F& V
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;# w9 h+ y# q2 m3 ]2 [% x
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    , B  Y" P7 C. Y5 ]4 a1 n9 k
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    / g9 ]- Z+ p# m$ l
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;" I4 b) I4 _0 [5 l- Q
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    . ?$ A& ^$ o" d
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    : H7 }  O1 p& @0 e  q' ?8 K+ u
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;) b7 r* S& i5 `3 m$ u
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    5 {& ~4 L4 d2 @: k" m% ?7 \) {
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;) _& @# V( k( h) H# Y
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;: t4 ?5 Z& w6 T  k! d
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    : m# p3 ^/ ]- o0 N  l; d8 l4 Y( s
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
      K# U. y7 D8 V( \$ S9 {' z
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;( Y+ c& f7 W, z3 ?* z& x, S
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;  `% n- V8 f' ~8 j$ Z! c
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;! Y3 Y& B( B: ?( N' |( w2 C
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;5 a" a5 b' @3 R  _2 D- X% a: z: M
  64.   end;
    ( R4 I9 `- g) S7 h

  65. ( ?6 {# Y+ b0 W
  66. {  IAudioMeterInformation = interface(IUnknown)
    4 b7 b4 k  a  o, G  S/ L3 x1 C
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    - n4 o* d* R. q1 s6 {9 r
  68.   end;}" G7 V# ?. M9 [7 T% Z

  69. 6 r; E* x5 B7 ]$ E% o1 k" s
  70.   IPropertyStore = interface(IUnknown)
      |3 i2 o2 c- Q* H- v3 v, E
  71.   end;6 i* V- P4 k: k) r& |

  72. - J5 R# @" _4 J( V, `) ~
  73. type3 \3 h" k( F, f+ M0 R+ D
  74.   IMMDevice = interface(IUnknown)
    3 d+ A! z, U4 j7 @- l- U
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    6 F  M" b; Q* C' [
  76.     Function Activate(  refId :TGUID;
    7 {, ~. K5 Y( L8 a- E
  77.                         dwClsCtx: DWORD;
    ' P1 I% p) }& X$ V4 z9 [& V
  78.                         pActivationParams: PInteger ;
    ( ~* s5 o8 a- _
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    / D3 ~6 X; M5 O+ Y$ S
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    8 i. f7 E4 h% w; S
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;& M) W  p& o+ a5 Z
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    * l, e- W5 @3 f: u  w

  83. 6 a) O8 D9 Y) ]8 H' E
  84.   end;
    ! `- ~; z4 U+ `9 V: A

  85. % E# O* B+ n6 C

  86. 1 ]% ?# s( ^# {' Y
  87.   IMMDeviceCollection = interface(IUnknown)
    $ ~, U8 U# l$ u$ ^7 B3 t, R# Y* Z8 k
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    6 L2 Z/ \  P2 h9 `
  89.   end;
    5 r; K& f7 ~) d: m
  90. 0 G+ ^: r$ T) T* i0 \) K, g' s
  91.   IMMNotificationClient = interface (IUnknown)
    & f" d& j: \0 v# F" J
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']+ m$ Y, Y' _6 r
  93.   end;
    , x7 g/ Q4 V: k( v$ z7 w8 S

  94. - b& T7 ^4 D9 F6 k0 d
  95.   IMMDeviceEnumerator = interface(IUnknown)
    ! U8 x$ I& A4 L6 ^& B# F! e
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    5 F% [3 R: _! [; B" ~, b
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    ! [* r; X8 K  Y- E2 c/ S
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    * A% l! j" ~/ N# y  Z3 o
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;  ~5 d& ~8 [9 K6 m6 \
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;7 B$ }9 L# R% h8 j9 T
  101.   end;
    8 N( `+ }" O. |
  102. 4 {' k5 ~3 w& z8 B4 w& G6 w( c3 m
  103.   implementation2 A' \6 {+ o* z4 E
  104. end.
    0 L( _5 R4 w" A6 [

  105. 9 S: [3 o. M  z. l3 q
  106. Thanks & Reagrds,' S" O& r7 l; J( H6 ~
  107. Mukta ...$ X3 o- P2 c8 b/ R* n# L4 v( R; W
复制代码

  1. 6 Q0 E+ B& J- g$ q2 {4 F$ v4 z
  2. it's work in Delphi 7
    0 q* V7 Y7 q" T
  3. //////////////////////////
    0 |! g/ O3 ?3 N$ t& }

  4. 6 K0 ]  ]& m4 a. S# J& }
  5. unit MMDevApi;9 I/ f8 i4 Y% W& u4 F+ P5 ?

  6. 8 E0 @" E3 k" \! l9 a
  7. interface
    + N0 L3 K. E; `5 Z% E% z5 b

  8. 2 T3 {; A* O" s6 o4 t7 l+ H; c
  9. uses
    ) u8 H7 o+ k, _. H
  10.   Windows, ActiveX, ComObj;
    8 d, m/ e+ z0 b& ?

  11. / `3 M5 s3 ?% I- E; O+ `9 u) R
  12. const, e+ @  T6 o0 |& s; [8 L; \
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    8 E3 f& E8 T) I* d2 T" `$ l! I& i9 v
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';+ v6 Q! M" s' F% C0 C6 K: n
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    - I' ]0 p$ [: r, E# o* u3 k8 J& M
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';5 n7 p& D" y8 r
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    9 w7 l, U: ~. a: r
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';0 ?- N6 G  c3 m6 r1 I+ a
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    4 B2 i+ |/ l0 x7 c- m3 W1 e# s/ ~: j
  20. ( o! q: y% W; L6 }; g8 b
  21.   DEVICE_STATE_ACTIVE                   = $00000001;/ K/ _! c, Q: N. s
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    7 k+ r* e' A5 f7 V) T- c
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ; a; L+ S) h! T5 L) y7 n; J& Z3 D
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    4 t& r" {7 u  }' @+ s
  25. ) ^* l/ f# s. q) m, M2 O
  26. type
    ! k+ ~' Q' {. l! [6 V
  27.   EDataFlow = TOleEnum;
    8 ]/ M. B+ ]+ T5 F
  28. . O" Q. j- K, h3 a6 h9 W+ f
  29. const
    " t' Z5 `9 {8 V; z
  30.   eRender                               = $00000000;2 y. z4 h( H' A$ `- q% K, |3 C
  31.   eCapture                              = $00000001;7 i- L- G! S/ N
  32.   eAll                                  = $00000002;3 _6 K( ^$ d1 ^) S
  33.   EDataFlow_enum_count                  = $00000003;+ Q) F5 H, R! h$ B1 O" D& l
  34.   P1 }; Q* e5 y1 C# L& ?, `
  35. type6 |0 ~3 f, m0 O  ^+ m% ?- [
  36.   ERole = TOleEnum;: |3 V) }' z" h+ V) o) r
  37. 7 d& w/ @1 m! j2 |3 R7 X! C
  38. const* k) c& S  ?. Y0 L  i
  39.   eConsole                              = $00000000;4 V1 V- t9 y8 S# @" @  `3 Y* H
  40.   eMultimedia                           = $00000001;  v! _4 G' n$ ^- I. C
  41.   eCommunications                       = $00000002;
      s% D3 Y! Z. `* }6 ]  Q9 D
  42.   ERole_enum_count                      = $00000003;
    * N* S1 b5 {, a! i% F

  43. . \  D2 k# ]  U, p5 L
  44. type
    9 O+ B7 l5 {7 x' j! R3 I5 }
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    8 w; p+ S# i. S! t$ y3 J
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']8 {9 F# `* k' L: k/ C* d/ N) k( F$ G
  47.   end;
    & b( D3 I6 n- Q, m- ~5 _

  48. , L5 [" r- E' `% J+ b5 M% Z
  49.   IAudioEndpointVolume = interface(IUnknown); \  Z. O7 a2 L4 ~# n& S
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']* F" M7 V6 G# e
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;! V; g$ H/ ~3 V  d: [9 P, k/ \
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    " x& u1 |- n! E2 a: k
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    + m" F* k, K7 X) |- o
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;' t& C7 x0 v! a1 Q
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    ! n/ o6 M4 j$ O* d  C% Z
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;% y. R$ p3 t% D. U: w
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;" I( w/ g0 `* P% q  v
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;  F7 M0 f6 {* N$ K8 g" B8 t
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ; K, z6 Y, ~5 _. J
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;" r* B2 L3 f7 A- x) ?
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;1 J0 Y; [+ a9 |- u
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;, M" a# K6 I/ ]3 M6 a3 g( v
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;1 B- i5 X- z- Q
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    / w5 Y9 p- {# ]( L9 _2 o% H4 r
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;3 N7 r$ u# t) D- D: m9 ~$ M5 K
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    ! `( M1 T/ n7 U3 H' Y2 g
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;+ y! v1 O, I, \2 t! z  K. A3 x  b5 T- h
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;  h# J) E" ^- {) m/ `" I. Z+ {
  69.   end;. w) ~3 ~, K) M/ K

  70. 7 j6 {0 n7 i* q$ y2 E
  71.   IAudioMeterInformation = interface(IUnknown)
    5 v; A4 }! ]) ?
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    , m) I7 B- Z' }: ?
  73.   end;, _% k2 _5 a! P) w; S* w

  74. " h' |' w% M4 |  G' U2 l! \
  75.   IPropertyStore = interface(IUnknown)% A- b: Y. |- T. P  K
  76.   end;* e1 O9 M2 X  k6 q
  77. / _- c1 @& ~0 ^3 l  S4 \: O
  78.   IMMDevice = interface(IUnknown)
    " n. N. b6 E9 o2 V; L
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']+ x: {5 a: a6 i
  80.     function Activate(const refId: TGUID;+ X2 g9 `9 L( D
  81.                       dwClsCtx: DWORD;
    4 a) J, n/ F. b1 o! o
  82.                       pActivationParams: PInteger;
    . P2 z7 E4 t( u
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;- {+ S9 K2 h2 p& }2 R
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;1 m" U9 r* n# v; W  J
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;% N5 b- N7 F2 Z. S
  86.     function GetState(out State: Integer): Hresult; stdcall;
    % ~1 H% f4 l' t) L# w
  87.   end;
    & c# g( z  L# {% }. s2 g' t
  88. " @6 V$ R: I, W5 u; X

  89. : V8 @/ u- K1 r2 i" [& o9 g' w% q+ z
  90.   IMMDeviceCollection = interface(IUnknown)0 A! R: Y* g$ r: z7 C( v
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']! R5 R8 N! A9 x% N! H! }. K5 u$ k
  92.   end;
    + l* y; F8 d* ?+ z5 F& _: C; V

  93. / H" e) i+ Z6 k  U
  94.   IMMNotificationClient = interface(IUnknown)
    ( x3 D3 K. P1 ?5 b& P, ^6 {6 R
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']' H+ A0 f/ `/ ?" T
  96.   end;: o$ S. v) [2 x7 M
  97. 0 ]% O1 b" v" T$ z' I1 x1 X* Y
  98.   IMMDeviceEnumerator = interface(IUnknown)9 N( e+ |& k% n7 W% e
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    2 `' [' B5 `& o; w4 i! s  Z
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    - h% K4 H  w' b% W7 u7 u+ E/ w
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    9 X9 N4 w8 H! _  Q( @% K
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;9 u$ Q  q0 F( F% Y' w5 C
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;; U4 H8 `. K% D; e
  104.   end;/ v8 m* P/ a3 Q, i! q& J/ e

  105. 8 d9 ~' X' L) p* @4 g& l
  106. implementation
    % t8 w5 c8 M% o( O' F

  107. * V+ t$ |7 b. Z" S4 L& }/ X  Y
  108. end.3 d0 g! J* f3 Q7 c2 p; }% V
  109. - z+ i; [- k1 W9 b
  110. ///////////////////////& d0 F* E+ `% D" @, |
  111. simple sample :)
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  112. ///////////////////////
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  113. * @" c! s5 [4 K  `
  114. //...... other code" K+ T9 ]# ~, A! y
  115.   X4 [2 j0 u9 }( u5 G, _; H: `" U# A
  116. uses ... ActiveX, MMDevApi, ...;. S- {' D  e# k7 J3 e' g2 d

  117. : l5 R2 c$ E/ J  j& ~" q0 N6 Q6 w
  118. //...... other code' c, _; L% n% U, n5 q
  119. % M( I  L3 y/ o" q; [
  120. var
    ' K( g! r! y1 k$ m; I
  121.   endpointVolume: IAudioEndpointVolume = nil;6 O! H4 W# v6 s: i) z
  122. & \2 e$ n+ y7 B- k4 \% ^
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var
    % P. u( z6 a; U+ @+ f; B
  125.   deviceEnumerator: IMMDeviceEnumerator;
    ; Z; E5 F& r, p7 \: x" Q6 q& P8 Q
  126.   defaultDevice: IMMDevice;$ @: M0 n0 g6 v
  127. begin
      b: c1 c- \" ?/ r2 w, T1 y$ f4 I
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
    ! s2 d. M1 z  f! b1 o* t" Y: h
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
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  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);2 J, T, N* d5 q- p$ H8 m4 q
  131. end;* }) }7 @/ A) Q& a% b
  132. ( Y# A  J1 d* \7 b0 U6 N) C. s
  133. procedure TForm1.Button1Click(Sender: TObject);5 J+ ]/ F- O) T) }; g. a" v, H
  134. var; v/ R5 @3 `7 i* J! @8 t
  135.   VolumeLevel: Single;
    ; f- @4 @, I+ g3 D. Z
  136. begin5 C% X( k& f2 D+ k4 s
  137.   if endpointVolume = nil then Exit;( X* D, p$ e) ?; j$ f: _- {
  138.   VolumeLevel := 0.50;' h; l9 ?3 v9 L
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    4 p- h3 n( S6 n8 h  w
  140.   Caption := Format('%1.8f', [VolumeLevel])" e. Q% F/ z0 J* h6 G. u
  141. end;' k0 i+ R# l$ ?  M2 c3 ~

  142. ; f5 S, M% T4 U, s1 P, d- \- h7 N
  143. /////////////////////////////////////8 h8 a' {- O9 [3 F" i9 A

  144. ! ?' _* _0 e2 b$ E# _9 a/ r
  145. // with best regards ToxicDream
    # F. L0 N5 o/ f
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