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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& ?& `0 m& c4 t3 L( ]0 ?
By Mukta & ToxicDream
  1. , G, U% g1 S' s& _" C) a& u: G
  2. //for delphi 5
    1 {7 e; g$ `$ d
  3. unit MMDevApi_tlb;5 y- e; T* _' z* g$ ]' |! p

  4. 6 T! V, ^4 B2 z+ D  S2 s  _0 w: L% r0 d
  5. interface. |/ m6 g& v- B- G% w. G
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;3 O5 w6 h- L' i0 ?' [4 ?6 N
  7. const
    & p; d7 x# e; q
  8.   // TypeLibrary Major and minor versions
      q5 v5 q0 R( P, F- Z$ w
  9. * X7 u" K5 q$ C7 c8 O. u
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';! {/ ]1 _1 A4 N; s4 B
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    & X$ s. H2 W- y8 R6 ~* t9 f( ]1 D* j# ~
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';5 C! Q- {& S( K+ j
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    + u5 `: \" d! ^
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    - C0 B. `& X  w5 ^
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    / o5 U7 t/ s% t4 _1 P
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    % j7 S" h0 G" p( U2 c

  17.   T  q  a3 n5 e8 f& ]3 T" N
  18.   DEVICE_STATE_ACTIVE                   = $00000001;, ?1 U3 m9 W7 w- |. H. z. K
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    4 a2 l8 a. r) B- V
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ; T/ Y" D' u& w. k/ o1 V% ?  Z
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    % M5 j6 G6 ~) {

  22. $ S! K* j  v& M5 Y8 N
  23. type
    ; I% D) n& Z' z! T
  24.   EDataFlow = TOleEnum;" g- G9 _8 u+ v3 I0 D* h
  25. const) r" \4 B3 |- T, t, @4 m
  26.   eRender                               = $00000000;
    $ n" c$ J) L8 r$ ?
  27.   eCapture                              = $00000001;
    ! d0 u  P3 T- i) k' h& d
  28.   eAll                                  = $00000002;
    : M& N& {# R8 k3 K
  29.   EDataFlow_enum_count                  = $00000003;
    $ S( s/ ?* K9 o# ~0 k3 ~- n
  30. " v1 C! w4 K2 o1 D6 q& m+ c
  31. type
    + S" I* i8 u% @, L9 y. E5 g
  32.   ERole = TOleEnum;
    ! w& B) |4 ~; M
  33. const
    0 \+ D" i  j* s. l+ y  I* j
  34.   eConsole                              = $00000000;3 L7 i) k. N! I
  35.   eMultimedia                           = $00000001;
    . \0 x6 _3 ^4 e. R0 ^8 H/ W* B2 `
  36.   eCommunications                       = $00000002;
    0 M" h* n# n( e* Q
  37.   ERole_enum_count                      = $00000003;
    4 s, J/ ]4 J& |* ^" ?
  38. ( Y4 ~! u- ^' V$ o6 P
  39. type) Q' M) M1 Q1 J+ `
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    4 X: M3 |' C: v2 Z. T6 p+ S
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']1 w( h% x3 t# B: ]- [- D) a
  42.   end;
    % J5 P; J* t0 x/ B
  43. 7 ~. `- H: H/ P9 V, H
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    7 V5 y0 t( ?$ H
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    / ]5 i7 K% X. T9 z1 ~& O8 `
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    / {; z1 b) E+ ~& r+ O
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;& L  I8 T: X& c( p  H. c. s
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;& j2 }" `9 p! g1 ~
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    / a+ l  e& \* X. ^7 Z- Q# N3 C
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;8 j( [& e! U1 e" C
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;7 U$ K* Z) u  e; J+ @3 t
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;3 u) V$ L/ k) q6 v
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;  w' K: r% o/ w. ]
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;1 R6 S" u! H9 h0 a4 e* z. w* @
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    * K+ L6 o" n7 a5 f* P/ w
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;! d+ c. U, T" q- q. U: _
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;: D) P  V+ \5 n0 T7 O, ~' A
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    / R6 p9 c7 L& ^! W2 {& d1 a5 W
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    , ~! c  U0 Z) W( o) O7 l0 J
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    + C( T8 B* X8 V1 N! K
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    9 ?! u3 U2 x( M9 u4 T/ `
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;) C# ?6 h4 R4 O
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    " {$ t6 `' L* P) U  ]
  64.   end;3 z$ A5 _, F, L3 W
  65. + e! b, v/ C# O7 K1 b+ K, V- H
  66. {  IAudioMeterInformation = interface(IUnknown)
    . X1 V- M4 T" l& }  ]9 |
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    2 S4 V! O$ y' Q/ _0 C* t: X
  68.   end;}
    5 A9 n5 }# b" z5 w8 o3 z; {
  69. 8 i# ~9 F% s6 T) \0 x" n% k
  70.   IPropertyStore = interface(IUnknown)
    . t$ C- v$ e5 H* z2 R0 z( C
  71.   end;
      B4 H3 D! R; O: L7 F
  72. 8 M6 x, ]( v( N9 l$ X. F$ I/ b. q: O, x
  73. type$ Z; L* i7 f/ [$ ?3 e: f
  74.   IMMDevice = interface(IUnknown)1 ~( p; C9 E$ |
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    0 M# d( R) x; ~! w: S
  76.     Function Activate(  refId :TGUID;2 o- T' ]7 r  t* V4 x# @
  77.                         dwClsCtx: DWORD;
    & L9 r) b8 R! F
  78.                         pActivationParams: PInteger ;8 l# U! I$ X, B9 h6 j( r: ]
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    / c4 O( p( ~4 W6 O( m, f9 V
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;9 ?3 f9 O- |( B4 T5 Z8 m! ?
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;5 i) @7 o/ ^3 e* B2 N
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    1 G, ]9 a) @1 Y8 `
  83. 6 I8 r4 H* F4 Q/ E9 H
  84.   end;3 v9 _; X3 z3 K) }

  85. " l" d2 H; G& y2 ^- v7 \
  86. . j: e! s2 J& J" t9 G- _! F
  87.   IMMDeviceCollection = interface(IUnknown)
    ! S" K. N. b6 M( t9 T4 z+ u
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']; I2 U. R% E5 Y
  89.   end;
    $ W( \  e8 i3 G4 g% a7 x. i; Z
  90. 0 P0 H0 R$ Q0 ?8 x  U: s* i
  91.   IMMNotificationClient = interface (IUnknown)
    1 T& B- ?& ]% R- Q! q* C
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    0 g1 t3 j6 j3 x  C/ c
  93.   end;2 ]7 z7 f: X0 A

  94. ; F. u0 h$ A" ~& J  t+ C4 M
  95.   IMMDeviceEnumerator = interface(IUnknown)
    - l) V4 a( `6 ?3 Q) I2 [0 x* |
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    , `9 M8 ?" ^; H6 L  G: A) Q6 G
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    , O  U) S" F+ R$ S  a. Y+ |/ H+ N0 x6 ^9 @/ q
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;% @; p' x+ O6 V5 b
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;. }2 A; @/ K% L0 G4 `* E* h$ b, t* Z
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    0 c) Y: K9 o6 ?4 S. Y5 h# d
  101.   end;, a$ h, l6 Z5 y$ f% O

  102. ) t% _# r; D( Y# h+ u" h
  103.   implementation* q1 J% A6 z3 M0 l  U) p9 i
  104. end./ ~4 o  H5 I; j. z+ I
  105. ' c- z) d, G; X; V! K; L* r
  106. Thanks & Reagrds,! t+ o8 Z6 Y% v* T  c1 N/ l3 g8 I
  107. Mukta ...
    $ l/ G$ I7 F" {2 F
复制代码
  1. . w% m0 ?" R, V( X- n) N* B
  2. it's work in Delphi 7
    ' @7 x) e( Z; ^
  3. //////////////////////////2 q+ X0 g) p% f: X6 F

  4. ' f+ a: R% p4 I2 U" L7 d2 t. V* H
  5. unit MMDevApi;& V! {9 r* l5 ~
  6. & k9 W8 x2 r8 E4 x
  7. interface: n$ a. A, b+ s9 S: W

  8. ! K  O+ S, I+ N6 R: j$ c0 y
  9. uses
    ( V7 b( t8 \! r3 [6 S: u
  10.   Windows, ActiveX, ComObj;9 g) ?0 }1 J2 f+ r6 u- n2 B

  11. ! W* J% [* I. t
  12. const* m! T( P; c0 ~- e
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';. ]1 x8 P  S# @9 ^7 ~( z( P
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';( [8 O; J. p6 L6 J6 b. z
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';1 J, N9 G& ]; l8 N
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';, F& i1 b- |' A- P$ J- b
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';0 C/ u# c+ J6 W; A# m
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';: Y2 g" a# J4 w# ^
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';& M' M8 m' B# r( X( L+ F; {, w

  20. ( H/ d2 L/ c. [; E5 S
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    " U" i- K  A9 v' Q) a
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;, h. a, ^, U* i4 C0 b
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;, H6 M; e3 h* G" X- N
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    5 t/ t6 V  c# I+ A9 W( Q, z

  25. ' y9 b: J5 x( n6 h9 p' s
  26. type3 X# w+ n. j3 i4 c
  27.   EDataFlow = TOleEnum;
    9 k3 p8 V+ U6 f1 |( R# a+ F
  28. 8 ^, [: p/ ~7 U5 J
  29. const
    % u% B. x6 s8 W) q6 N
  30.   eRender                               = $00000000;8 f! o) ~% T7 _  f" ]( `
  31.   eCapture                              = $00000001;: H+ S5 g6 d1 v1 @. i+ `  E  a8 ~
  32.   eAll                                  = $00000002;) o* z  r( Y& e; B
  33.   EDataFlow_enum_count                  = $00000003;
    : X4 G/ ~$ E- P" e8 ^

  34. 9 E3 C2 a) y( {7 u7 g" t7 o
  35. type: ?: Z  T! v( V( F3 u
  36.   ERole = TOleEnum;
    : t$ l" r% z: d/ H. d! A  A1 [

  37. 8 U# c" _; `9 b( u$ b$ p: r8 k
  38. const
    + T1 c1 i% o- `
  39.   eConsole                              = $00000000;
    & l! u3 S% {7 E' z, s/ L' W; f
  40.   eMultimedia                           = $00000001;
    ; I! r% B! Q7 a' m) c
  41.   eCommunications                       = $00000002;5 W! n/ d! f: H4 Q+ k- o8 f8 e/ f
  42.   ERole_enum_count                      = $00000003;
    7 i4 e9 ]8 O3 C- {6 _7 c& z0 n
  43. ) s, j3 I/ k1 b
  44. type3 I1 v  q" w) a( `7 U/ }
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)& k$ O' [) K8 f9 W8 e
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']5 v  r4 y3 H8 r
  47.   end;
    $ ^; ~  }; r" I$ _" I  P& `

  48. . Z5 |! f. B+ s" G) }
  49.   IAudioEndpointVolume = interface(IUnknown)
    : M4 x  T+ U7 I. p$ }
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    2 m4 j8 A: Z* v/ H7 }& q1 }4 u3 U8 Y
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;" j( P2 c1 S2 C; y' W/ ~7 j" Q
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    5 k, `# w% H9 Z, u
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    + N# J/ ~0 y7 y) i* L' B
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    / s2 G9 G7 ^: F' B6 a1 P$ f% p
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;( u8 i4 k4 U  N2 K1 c; v/ j* V7 O
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;. n* F! V) D& t$ b: K' x, `
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;' {; d: z# H/ F0 G* b. p4 z! _- [
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    - {7 n7 P7 ], v; ^! h4 \
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    * r* M/ ?. G- v% a% E9 y6 `7 S
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;4 O" d" u, f! e3 X
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    : D, Z" A$ M# N2 [' }' p9 U
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;9 ^& k" c! B2 A; l, a
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    & @* Q: l3 i( K  j2 z1 I" V4 _& d
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    % J" J- O* H3 o1 s6 A0 G1 C2 M: B
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    % L8 @# X# n. ?+ I2 M  y' J
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    - @3 }8 Z! ^" {! X2 r1 G% }
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;* g+ Y' ]. g1 {8 L6 a% M; K
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;) J) t) Y5 Q1 b, g
  69.   end;# r5 E# ^: f6 w+ f" G9 a4 l

  70. . d3 n. Z7 F% I2 I/ W1 I1 C" N$ Z
  71.   IAudioMeterInformation = interface(IUnknown)6 ^; R9 R! f8 n
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    # w' h7 H9 D. ?( U
  73.   end;
    ; N8 r  h# h4 l! z3 {9 k5 E

  74. ; K* z$ h  A! L: X1 i" X
  75.   IPropertyStore = interface(IUnknown)% _5 }6 h) `7 G% ~1 k5 u+ x' p
  76.   end;+ G0 f2 ?0 w6 I2 A+ W, j; L& m  n- t7 Z
  77. ) n& e' B  m  n1 x
  78.   IMMDevice = interface(IUnknown)
    % V1 g1 b$ W; L3 b8 j: \
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    + f' Q" b$ U1 n1 u
  80.     function Activate(const refId: TGUID;
    3 x) E* b1 d% k  @
  81.                       dwClsCtx: DWORD;
    ! R3 P, r* C' f! Q: h
  82.                       pActivationParams: PInteger;# T9 @0 c  s6 y) O4 ~3 t9 B4 S+ N( R
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;: v* R5 i8 i. b2 n
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    0 f! \% i) E/ G" d! D
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    ! M' k& R3 y# _7 R
  86.     function GetState(out State: Integer): Hresult; stdcall;" n; d! w7 V1 {6 j
  87.   end;3 G  }  i  R5 q& P$ r' u
  88. % h- t* \% v5 f" ^1 |' \9 L
  89. - Z2 @$ v2 J! W2 n
  90.   IMMDeviceCollection = interface(IUnknown)5 j8 v. ~# X$ l* g
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']% W9 e' r% m* X! y4 g+ l
  92.   end;
    ' f% G+ @8 J5 x$ z. T
  93. . N: z2 c; D  f4 l
  94.   IMMNotificationClient = interface(IUnknown)* [) d- M5 z( c& ~% \
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    6 M$ q* a% N: V2 h4 \& S1 ~0 N  I
  96.   end;" r, z: l9 x) f! F4 d) H2 E8 [. Q3 q

  97. ) Z/ Q2 U3 s9 Y( W8 a( |! L
  98.   IMMDeviceEnumerator = interface(IUnknown)
    / G5 R8 u- g2 c8 o- i6 o
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    # P+ B6 l* a" Z
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;- y$ F( m: B! u, W% Y" \& q" D) H
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    1 ]" w% ]' _* `
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;/ N9 `2 u' b# Q, h! `5 k
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
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  104.   end;
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  105. % U) o# S( G7 R' [) J) P$ g
  106. implementation
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  107. 2 h- t6 {4 v, s9 i4 c
  108. end.
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  109. ) n5 t3 R  K5 X" X, |
  110. ///////////////////////! {6 h5 `6 Q5 f. E4 z
  111. simple sample :)
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  112. ///////////////////////  ^1 U8 G% H4 n0 u9 R

  113. 4 N- I8 j/ b2 ~7 Q- Y. z  k
  114. //...... other code7 B3 x. U5 `9 O6 j

  115. ! Y$ }/ j( z0 j! l7 I% t! f
  116. uses ... ActiveX, MMDevApi, ...;
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  117. % x& ?: g2 K) `8 ?. A
  118. //...... other code
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  119. 7 \$ }6 q5 n: Y7 t$ c5 I% h
  120. var% x5 w! {$ Y& q7 w9 l" u8 z
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. . I+ L5 d( |  J. T* l, |, s
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var* q# L/ M8 h& q
  125.   deviceEnumerator: IMMDeviceEnumerator;
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  126.   defaultDevice: IMMDevice;
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  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);6 ^" A, u- V. P5 w+ w# u
  131. end;# x7 m% p# a1 B' C+ {; H# L

  132.   I( c: g0 i8 n  S' D
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var9 Q# P* Y# L& @" y7 L
  135.   VolumeLevel: Single;
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  136. begin5 Z" X2 J+ _) T, x1 T: L; i
  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;9 Y4 g5 g$ o0 N
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);& H. f0 o! L! |4 ]+ F2 i
  140.   Caption := Format('%1.8f', [VolumeLevel]): J8 c6 n, q+ E1 r
  141. end;1 d  K6 P3 c$ B5 S

  142. 9 D1 g5 ?$ n3 r# w8 V' D
  143. /////////////////////////////////////- |( f6 s) T- B* |1 n7 r2 ^% u, z% K) C
  144. 6 H9 o' D, _/ G+ G- `
  145. // with best regards ToxicDream7 g$ q0 a# |# h9 B/ g1 m  `
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