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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
* ^4 _3 S* X8 `5 }( u. mBy Mukta & ToxicDream

  1. 6 c" G  D. h. v
  2. //for delphi 5, r# k; h/ L, Y5 C' x
  3. unit MMDevApi_tlb;' M+ h0 M$ c+ J7 }# M
  4. ) p, n8 C! V) X( t( e% Y& B3 q
  5. interface
    5 a7 \& ^% a1 p, C' m
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    3 A7 Y, p6 n2 [& c1 M% w
  7. const; v# X: ]+ ?" R2 N4 e' r
  8.   // TypeLibrary Major and minor versions
      _4 Q  H  ~2 [, @6 v8 s/ [
  9. ( j) y) Y8 d5 J! x. X* s
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';- l% v, ^: q/ p6 ?, r: W! P& u$ p
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    " R4 G: ]. x# A% a3 r$ C0 i; d
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    0 b% D- n! E8 J4 n
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';3 E, F) H; f+ r2 E
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    % l' c1 ]# v0 G0 ~. f
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';& R2 H& n8 B0 D( V
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';" F+ |- F; F" g

  17. ; r. ^- u& J/ k" C1 a  M7 S
  18.   DEVICE_STATE_ACTIVE                   = $00000001;+ g* v0 O. O& {
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    7 g0 f( P% v3 s* H
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;# B& N. O: O  x/ P0 ?
  21.   DEVICE_STATEMASK_ALL                  = $00000007;: h2 @3 |4 z3 v4 m
  22. 7 T* f% R  `6 e9 a8 O7 m4 W
  23. type- Y: r0 [% f+ ^& s: f6 `
  24.   EDataFlow = TOleEnum;
    " g9 e, s: C0 \$ {
  25. const$ I$ y, D* c  \: `" o2 n3 B
  26.   eRender                               = $00000000;5 W5 P: L1 s1 Y# B  T
  27.   eCapture                              = $00000001;  d9 k) w) E; y3 E4 u' B4 P( m
  28.   eAll                                  = $00000002;5 A9 D. I) F% r) P
  29.   EDataFlow_enum_count                  = $00000003;
    8 q! H9 l/ \& p1 ]* Q& V
  30. , {- c  H5 ^) v: U  V0 n
  31. type
    / z' H& C. L/ H1 q" @( n+ G% k7 P# ~
  32.   ERole = TOleEnum;
    8 J. q: P- p: H. L+ z
  33. const. ?. {1 n' |1 a8 F* I/ _: D  ]
  34.   eConsole                              = $00000000;5 s: ?& c* U% P* g2 y$ }7 [0 o4 Y! j
  35.   eMultimedia                           = $00000001;
    ! L4 Q, D  V5 s$ t+ p. u
  36.   eCommunications                       = $00000002;
    + V3 L" M0 D- e. U  L3 Q( o' e
  37.   ERole_enum_count                      = $00000003;2 y' T3 y2 A7 p8 {) T* o$ G" u
  38. : K* h; o6 t& `' O
  39. type
    ; v1 A7 a. H! \: V6 S
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    4 w* v% V3 _0 G& D' {
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']2 F& l$ H4 F! b% I! y1 q+ p9 }
  42.   end;/ ]6 s3 ^( f/ T! Q" o- e
  43. 6 e. e5 ?8 h' L2 K6 x0 {
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    2 J; f  n1 F' \2 Y; v" D4 n/ U, y# k
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']+ v+ t  s2 M  D5 h& e
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    1 m: {1 v* {% x' @9 R- ~4 ^. `
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    / w0 M. [0 T: O' Q3 k
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    0 `: F- A! l6 s& [) ]# P3 D
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ; d& f2 o; t% t; i
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;* }  |' z* d1 z$ i$ l
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;3 p4 O: c0 A# O0 r
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    ; r( L+ B1 z4 _) K* G
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    % u# F5 I/ E; \% G0 z7 U
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;, z- C& e8 c! B( U1 l% K1 ]& a1 q
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;7 l5 b; ~, a3 }. v% K
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;9 e/ X$ C" g4 J3 u
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;1 _  i) g. y+ C* l4 Z
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    9 Q& Z9 t  w! B# P
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;1 o, ?3 c! z& _0 t) l
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;- g. I8 C1 z2 k9 g* Z2 }  P" b, K( _
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;& N8 [( k7 H# X" f. r
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    ; |7 y4 m3 g& l4 J5 {
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;. P, @+ n7 d* a9 {# x
  64.   end;3 M/ r- q" s2 e/ Z; q
  65. # X! Y1 }( K4 Y  h& S' s- J$ k# @" J
  66. {  IAudioMeterInformation = interface(IUnknown)& b( U' D6 z9 p: H
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']# n% Q; K$ s+ e3 c) r5 F7 k
  68.   end;}* F+ C' u. _3 B2 \; U

  69. 7 p  [: M2 y) G+ r3 g
  70.   IPropertyStore = interface(IUnknown)& q4 S* P' @) W; A+ l/ ^- ]
  71.   end;# W5 s( a2 Z5 l5 x; V
  72. 3 [5 m4 X" q! z+ f
  73. type
    7 g, L: T9 t8 t. N& n$ M" ~! O
  74.   IMMDevice = interface(IUnknown)
      A/ m0 o8 G: w
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']+ c& ]& W+ V* Y3 Z! g/ F% `) b! b
  76.     Function Activate(  refId :TGUID;
    9 O' M. H- g9 R9 s. n' O. s' u
  77.                         dwClsCtx: DWORD;- ]( G9 w# Z6 j: \
  78.                         pActivationParams: PInteger ;
      F% w5 _( f2 G( ^5 s8 B% @
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    * D: G3 e4 @& C# O1 S5 Z
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    ; [: h6 j! j  x% A% G
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;) Y% b* p8 U7 v% ~2 R& |
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    0 l+ `( ]! w+ X, z3 j

  83. & \) E8 a! @" A5 R) }+ X9 \
  84.   end;7 L5 `9 V4 e; n" q. X6 P5 O8 o7 u: ]

  85. 2 L: d. ]5 o% L( m2 q

  86. - f# A# k3 x  P3 p# v" y
  87.   IMMDeviceCollection = interface(IUnknown)
    $ J! \1 Y" ?7 w/ e; W
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    5 _( E. V5 @/ p. r
  89.   end;/ F3 n5 j$ _% b6 a

  90. - |; U1 S- I  M: Y0 i. F
  91.   IMMNotificationClient = interface (IUnknown)' L. h) o6 `2 T. m3 z" @. d
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    . f: R" [% h3 @* a, G' j( ]
  93.   end;
    + n# d, K* Y" h: K
  94. ( y2 p0 p+ u2 G9 `: x
  95.   IMMDeviceEnumerator = interface(IUnknown)( }( N: X; H% {3 w
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    0 V( P* h$ L  n+ c3 }% x
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    % T* k& Y8 T! s, y, }; L
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;6 i" P) Y0 t. M
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;2 J  c, j* k" m. _5 m1 u! `
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;8 [! y; \% }. \5 J; l
  101.   end;
    ! E! k0 i2 _4 P" c1 C# l

  102. " J5 i! L7 g7 j' K1 u2 c9 r
  103.   implementation
    6 U. a* k. q" `: I6 ~
  104. end./ c# M% S$ U2 p5 w
  105. ! S7 s% _% G4 v" o
  106. Thanks & Reagrds,! l! s; z& I" a& i
  107. Mukta ...
    & G" j$ k  Z) j4 |5 R
复制代码

  1. # U9 R% K) J: }: a: Y' N. X5 ^
  2. it's work in Delphi 7- n5 z6 l6 R3 T$ X3 b
  3. //////////////////////////
    ! v/ Z* j" y6 C5 z+ b

  4. " w  c# E" G" I  y
  5. unit MMDevApi;
    ! t8 F: f3 a+ Y

  6. 0 I; `6 o5 A, y: |6 j' I
  7. interface4 q- D3 i" J6 i1 {. O# Z

  8. 6 B  w# ^6 I) z6 a1 c
  9. uses4 [8 E* F4 _, D+ k
  10.   Windows, ActiveX, ComObj;
    : ~) [2 W7 P% f  A" |; z) w
  11. & j# y6 G6 l: h: W5 B) Y
  12. const
      V. g' r' s) |  i0 i9 J
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';9 r: i& ?& j: N
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';: {4 `2 i1 C4 w1 }9 t$ w
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';4 `, g  `! j% o
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';" r2 c# ~2 V% l" ]8 K1 Z3 n
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';. q: S, a/ e6 h$ a: \* ?4 C
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    $ K% D4 s( G( Q
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    ! ~2 p  k( [8 b" n
  20. ' G, N9 {% i$ o8 T1 m: g$ X7 i
  21.   DEVICE_STATE_ACTIVE                   = $00000001;' M' W; w/ K$ k3 `3 D$ W
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    * {4 v5 N# {' n, S3 |
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    6 ]- {6 C6 T* F3 d+ W, i
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    / S# X' ^; D, I( [- P

  25. ' x: I1 H+ y- r" I! D
  26. type
    7 x' P+ I) g( ~2 c( H) Q: C
  27.   EDataFlow = TOleEnum;
    3 A5 v( h  k0 |3 `3 S6 ^3 }+ @

  28. - t5 ?; |- v, S9 t
  29. const
    ) i' N& r9 X9 |& d8 L9 C3 ?! [% A2 |
  30.   eRender                               = $00000000;7 m2 }! x" O/ X& J+ L* n# v
  31.   eCapture                              = $00000001;
    2 K$ @3 t6 T5 h5 e9 x
  32.   eAll                                  = $00000002;- T: g3 ?0 x. d' F
  33.   EDataFlow_enum_count                  = $00000003;
    : ^/ v, U8 t( M- D! B  b7 ~1 t

  34. , {- j; C) \/ A  x% ~
  35. type9 ?1 y- Q) g7 i/ K* K$ f8 m. d
  36.   ERole = TOleEnum;
    5 [& |( k1 T7 f/ Q5 t/ U* {+ E2 J
  37. 9 v; O, X% s: t# L1 P2 |7 M
  38. const, N5 s/ T& ?4 R% i+ T6 \7 _/ f5 F
  39.   eConsole                              = $00000000;+ b% k1 O/ c7 _; U$ |* S( B5 i
  40.   eMultimedia                           = $00000001;
    * Y" ~4 q% D* P/ D4 O) f8 v3 a, q
  41.   eCommunications                       = $00000002;
    4 ?5 y7 S, M; E0 w& n  J+ Z! ^
  42.   ERole_enum_count                      = $00000003;
    / k/ t- H! H% t1 m. B! W

  43. 2 P* n5 |5 q4 k+ C4 W' Y! b
  44. type
    5 p) a$ D. A7 b  [2 K: w8 c
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    2 _, P6 I5 M( n/ v# r! f1 b
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    % N. u, a& L% @
  47.   end;
    , B9 a8 ?* Z5 _; f* h
  48. 6 {1 L! i  O$ H- v+ k% C$ w" `1 i& V
  49.   IAudioEndpointVolume = interface(IUnknown), z& r* S, g# g5 A
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    9 p3 z* X9 S5 F+ ?/ Z
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    0 p7 V* _- f9 P2 }
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    5 B  U: d$ u: s& N9 Z
  53.     function GetChannelCount(out PInteger): Integer; stdcall;* ~( c0 K  Y4 X
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;' e5 P8 R( c2 _. B  d/ ?0 G
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    1 {# C: w1 H) c! a& K) G
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    8 d! m. w, c- ?1 K2 ]& I$ ?6 }
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;, x* }! K6 P/ n+ R6 R: n
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;* x  T# }' M5 B2 Q, r
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;8 x( d& u5 H, \; u
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
      W; [# {7 M# C
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    $ Z: g+ z4 S. A7 k
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;5 H( [/ N2 e$ ?1 |% q% ~' y' f% M
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    $ @8 Q0 o2 h3 j& X" d$ {" a- }
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;% m& j4 z+ j* T2 a8 y) l9 Z
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;2 H! L# s5 l# l
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    ; E, y2 `6 B- j$ [: C7 x/ `
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;' Z& X% X8 D" |( A( m
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;8 Y3 z- N3 ]6 Q+ d. ]
  69.   end;
    ) O4 K! B9 [7 R5 n
  70. 3 a$ w9 I4 l3 H. M# {/ P' j( O
  71.   IAudioMeterInformation = interface(IUnknown)) g; q% _  e1 K; }: D7 K# F8 M. _
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    + p- K" h0 k4 C, D, Y! q
  73.   end;
      Y9 d1 J. \/ R& W3 u, z7 D' k8 k

  74. 1 m+ j) {4 Z% \& u0 j  T$ e- N4 C
  75.   IPropertyStore = interface(IUnknown)9 p2 c- C0 ?' T% v' k
  76.   end;3 T2 X7 w; Y! |* y. p& O
  77. # I0 K5 q# U8 @- f5 u# h
  78.   IMMDevice = interface(IUnknown)* p! y2 m! z1 x1 l* p5 `1 s9 a
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']$ \8 R6 s7 O5 }
  80.     function Activate(const refId: TGUID;
    $ K8 c( a( ]1 R2 y" m4 s
  81.                       dwClsCtx: DWORD;" \" S- V2 j) @; k$ P" ^4 X7 B+ K
  82.                       pActivationParams: PInteger;, d; Y/ K* E' Z6 J8 Q
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    ) d  M9 i; F+ k+ U# O' G; M
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    $ Y1 x8 ~/ ]8 M& B) Q
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;% f! F+ Z: H7 ^( g& A- B
  86.     function GetState(out State: Integer): Hresult; stdcall;; [$ X1 T2 m$ h8 B# q& h+ t' N0 X
  87.   end;
    ; D6 l( N) g) f! M/ J/ S. f( _

  88. & E! ^5 T- a0 \: m& w

  89. # M$ v" @& w) L( F! c; ^4 h
  90.   IMMDeviceCollection = interface(IUnknown)
    1 p$ G6 @8 f* |6 x# w* f
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']$ F. C' D6 y, b; W  u, e# Q( P
  92.   end;: ?' W$ p, J) g* G3 C
  93. 5 b1 m: }- ?2 l* v7 A
  94.   IMMNotificationClient = interface(IUnknown)' X' V% G, ?2 {) e, l' I
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    $ R& D6 A6 n0 ~& v$ U  C
  96.   end;
    ( ]+ X: R" B* v

  97. . v( _4 R3 e+ z% q6 l1 E. i
  98.   IMMDeviceEnumerator = interface(IUnknown)
    + h% k6 c* z, r3 N6 }/ ]
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']8 X" g( G6 X& @( q
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    6 s6 k* ~4 o7 y0 ^/ z. \* Q
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;- o6 U0 s' ^/ K* ~
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;" {# l- w% j: K2 H
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;& M7 ~$ e% u: x0 t3 C  R: ^
  104.   end;5 S) A! |0 L/ f  S
  105. 8 ^0 @! z* c4 ?, t8 r) J
  106. implementation& j9 i" h" Q+ ]. b, z4 u

  107. 0 C0 i- D: p/ g
  108. end.
    + I9 e0 Y. j4 h& Y3 Z1 [; Y7 E" R
  109. 9 y3 N4 u) B# X5 N
  110. ///////////////////////4 l, |+ j0 ~+ v8 n8 A
  111. simple sample :); o: E4 l% `6 k& }
  112. ///////////////////////2 W9 Z3 D+ g8 d$ m6 F7 J: W2 d

  113. 4 N2 {* W& Z; c- f2 K( T' i+ N: i
  114. //...... other code/ s# {1 I* T3 |% \
  115. 6 v6 ]- O. S7 H( }
  116. uses ... ActiveX, MMDevApi, ...;" Y0 w6 W' u& P/ x8 ~% H  c
  117. - B/ w) {& T& ]7 S$ P" @
  118. //...... other code% b2 W$ I, ?$ B9 @0 f
  119. . ]) Z$ u! N. ?  z) J, k
  120. var1 ?7 |! Y8 {1 N' k9 a4 W7 F" \; G8 T
  121.   endpointVolume: IAudioEndpointVolume = nil;
    2 v0 B5 u. q; {! E! u6 t! Q; M5 |

  122. ; _+ U+ g. }4 i7 I* O+ t
  123. procedure TForm1.FormCreate(Sender: TObject);4 I  g. I. S$ N/ _" C
  124. var
    / ]4 m0 v7 {% j7 h) ?; T4 S
  125.   deviceEnumerator: IMMDeviceEnumerator;- G# r, `% Y$ G% {) v
  126.   defaultDevice: IMMDevice;
    * b+ h6 H0 B' s( T3 ~  p: G$ ^; E) C
  127. begin
      _( A! W( L# W+ H# q' r$ j
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
    & T, m; x8 b/ W9 G' C
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);9 D2 C+ _8 C4 O! ?+ G9 j' z% Z
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
    9 u, z7 t$ e3 H7 u/ Q% I
  131. end;. v$ _( d2 P' x  i, V6 v) w

  132. ) z+ |* l. d7 J1 o+ _
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var
    ( E6 p% O7 H+ x! d
  135.   VolumeLevel: Single;% y3 f' Y1 t; T+ g+ n
  136. begin5 Z. n  U# A5 g* f7 r
  137.   if endpointVolume = nil then Exit;7 G0 p/ O. X' X) m, e& g5 B
  138.   VolumeLevel := 0.50;
    / T0 P0 D( \( @& t9 V
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])4 h  i" V. F. B$ e1 k
  141. end;
    ) s/ a' `2 r. I$ G6 ^! `6 ]% V' z

  142. : M$ A7 G8 F# ]) j. W
  143. /////////////////////////////////////3 D6 F9 O  `+ Z: Z

  144. ) }) m& I0 K8 a1 W* P& y: U
  145. // with best regards ToxicDream
    ; g7 C* K7 k5 \7 p1 k/ E& v" |2 t
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