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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-a8c9-2e27eb9ec0581 r# I1 D5 _) n% Q1 Y
By Mukta & ToxicDream

  1. % @5 A$ y# r! q. J3 D
  2. //for delphi 5# M8 O: ~! O4 X( c. {: b
  3. unit MMDevApi_tlb;
    # l! S& T* t- _  q6 t% m! C4 d3 m
  4. % Y) m; Z- n& M: S5 L" B
  5. interface
    ; f- i; j0 D9 R' J8 Y9 @
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;* v& ]7 o& F+ b
  7. const
    3 U8 l# z: v0 \( r+ d( p
  8.   // TypeLibrary Major and minor versions0 R9 c+ j* j8 K" U; n" C" [
  9. , `( O; j( x% b; E
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';; C; _$ {* \" |2 n
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    * z# s5 B6 x$ ^
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    : y! x) b# r: Y" G
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';5 [$ y! n2 W8 B! S+ @" k
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';' z7 y- l" [; ^0 d( I
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';- B! j" A' r; m0 o" R2 s! f; \
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    ; N4 D. N- q1 ?$ E1 k9 {8 ?$ t
  17. / M: w# H! Z( y9 v+ V& o5 R" |
  18.   DEVICE_STATE_ACTIVE                   = $00000001;! N2 [3 s5 D' S4 R: ]
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;8 v% x6 ~, W8 x) u0 [8 g, \
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;7 @1 P) K" v4 m: p( d0 h
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    / Y# r* b2 c' I, L0 ?3 ^1 R1 }+ o

  22. % l, u/ X4 m0 X
  23. type
    ' _. _+ h: P! V5 g7 i; U
  24.   EDataFlow = TOleEnum;
    5 e; s/ m, p/ M
  25. const
    3 z( B+ g/ e, S% z- c
  26.   eRender                               = $00000000;. x- t0 M! W  q4 ^8 b: l* A" b. `
  27.   eCapture                              = $00000001;3 q$ s0 g9 i" N6 w
  28.   eAll                                  = $00000002;2 l- H1 O+ _/ {8 j; f/ ~5 M
  29.   EDataFlow_enum_count                  = $00000003;2 s" E$ z/ P5 l4 S# @: e

  30. . i. a' z' o9 f
  31. type
    9 d3 C3 P1 ?  s. I" G4 J
  32.   ERole = TOleEnum;
    5 @' }! _1 Y: E: E
  33. const, ?$ l9 Y1 M+ v, Z& ]
  34.   eConsole                              = $00000000;
    & j' k5 r; Y- V3 C
  35.   eMultimedia                           = $00000001;
    & w& R+ x* N0 [  e1 p; A# V
  36.   eCommunications                       = $00000002;) }+ H7 _9 u! [$ P5 W% B0 I; [1 T
  37.   ERole_enum_count                      = $00000003;3 h% S% X. p% P4 H& |- U* c+ `+ M

  38. # A8 [: x$ m5 F
  39. type4 M7 s. d* w1 r2 }# X( y1 X  Z' J8 g
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    + f5 r. `6 q0 y4 \& ^7 @
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']" \" O0 A# g) c- F" r
  42.   end;$ w0 c6 u9 ]! Y% U' J" F
  43. & f) A$ h6 \9 T, P
  44.   IMMAudioEndpointVolume = interface(IUnknown)" m* B0 b  s' K8 _# ?1 k$ B
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    5 [! O1 i( k. Z2 C! {
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;* }0 ]. d$ |! S( F) ]. y+ T) L
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;( k& l0 o- W. t, I, I  m
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;% y$ ?3 o: w1 Y( K4 P
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    5 c8 I, P( B/ f- W1 c$ s
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;0 i9 R9 _3 K0 v8 Q
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    ) @4 p* g# |5 `( E$ ~) E# {
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;3 m' P, ?8 `$ D+ K- H
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    # m; g3 A" P! z- w# `, e0 Y
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    * n" G/ {8 T8 l( c1 o
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;. {% D7 \, T  t3 ^: P
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;8 b" o4 q! y5 [( S1 t
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;* q: [/ P$ O: P2 w: L" p
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;. j: [, l* a; K/ e1 u2 W3 l
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    , H" y- r, X0 E+ ?9 I4 x  a/ ^
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;' O* Q! L( w% b% }
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    : Z7 h- @9 g3 G4 f/ b+ Q" @  s
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    ' |8 _4 |4 C& M* ~. h3 P8 I$ k( w
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;" ]. J% T0 m# G5 |8 f2 _* ]5 }" U
  64.   end;4 G6 {' |: y: W' {" a5 X1 ~) ?

  65. $ \* v# N. H+ h4 s2 b
  66. {  IAudioMeterInformation = interface(IUnknown)
    + w% B/ [2 o* }# C- U: {, G0 C3 T
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    : ~0 ^# G. s. U5 G1 H8 M
  68.   end;}9 j2 k! d# U0 }) P4 |' O8 K3 }6 d
  69. - M5 y# L3 |  z
  70.   IPropertyStore = interface(IUnknown)4 `- T  ]/ y1 b2 a: ]9 O/ R& g; Y# ?
  71.   end;
    ) M# p+ _8 s' W  v  X
  72. % Y! N3 B* S6 b6 k6 s3 t  D
  73. type: R# z( b/ S% N6 ^% r
  74.   IMMDevice = interface(IUnknown)
    / W9 }; ^" W' k/ X! X
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']  p% U: X" K% j5 N
  76.     Function Activate(  refId :TGUID;
    . A9 V. w0 E+ [; L" B' u# W- W
  77.                         dwClsCtx: DWORD;
    + m) S; V3 }6 W( r% g1 e$ V
  78.                         pActivationParams: PInteger ;; V( V0 C+ p7 ], u/ L" v. T
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;  K/ ^6 a5 }1 B; K
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;# ~- e4 H' O) z: D% h. @
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;5 J+ \2 m2 S6 N4 O9 O4 _2 Z8 L
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    1 ~* j: f6 W/ a0 S4 |# g# v

  83. ) h* u) K, Q" _* P  s; w
  84.   end;
    & c$ C8 L  ^0 L3 N

  85. 1 @" i# H0 N9 Q" H' B6 L
  86. 1 U( L* J# G$ P2 X- O. D
  87.   IMMDeviceCollection = interface(IUnknown)
    * ]1 h1 ^( p. g
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']% [+ e% f+ U# d3 ?7 b& D# n
  89.   end;/ f* A( _4 ^) ]
  90. ! R$ }8 Q. Y4 t3 O2 H! @
  91.   IMMNotificationClient = interface (IUnknown); T9 L4 }# ~7 W( P; N9 x" U) I6 M8 f
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    & H0 r& O) b# w: P( P
  93.   end;
    7 E" _# h) N+ ]0 W6 S$ O
  94. 5 l' Y9 d0 I- D0 g
  95.   IMMDeviceEnumerator = interface(IUnknown)! o7 q: w' b& p0 W
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']( E5 c  Z2 I; _$ X3 [# ?
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    # u3 }- |; s* ^
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;: q1 {- c. e9 x( e) X& ~
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    % x+ p/ P& h! L+ c$ U  U
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    / Y. |/ ^# I* y1 F0 Z  G
  101.   end;- }: i  ~% s& G

  102. ! p" _% P* u) F- `, J# K
  103.   implementation4 P4 k  t, s& Y) i+ d1 D! u& K- }
  104. end.
    * {8 Y! K8 C; q3 S4 q* R
  105. : A. J+ e8 I" h, j5 p  O  _
  106. Thanks & Reagrds,
    1 C" z5 _* V) ?; k
  107. Mukta ...2 C6 j5 u; I) ?8 @  [7 v0 N
复制代码

  1. ; J/ A& b* M3 ~7 S+ P5 b5 b
  2. it's work in Delphi 76 C4 a- t: a# |. G
  3. //////////////////////////$ O/ A& S: n  P) Y( ~
  4. & U* Q. l5 K# x
  5. unit MMDevApi;
    9 }8 |/ e- `7 \1 L# F6 j

  6. 9 V- |! Q$ S# h) F8 [
  7. interface
    4 ^! y. N; O$ W% g) @# f1 J  j
  8. " n$ U4 L  j6 |7 t
  9. uses
    9 G, V' Y0 m" ?9 |6 _
  10.   Windows, ActiveX, ComObj;
    6 H5 i8 `9 l' |+ a
  11. 0 g: `% J4 ]9 ^2 `! a- i& t5 t
  12. const
    ! n; b/ v. F0 u- Q, O. l, J! }, g
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    - q/ m+ r/ K; z% r( u% i7 n! }9 l
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ; U1 T8 S  E% ]. q3 n
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';( D9 P& u6 w2 x( J' D! O! Q
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';% i4 i- {/ Q6 P) E, W' a
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    9 t& ^  Q- }6 H9 V1 H
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    4 o* h3 ?9 F0 S( m! ]2 a
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    7 E, G; J, g9 c' r5 d
  20. , H  e8 @# o* s  `: Z2 B
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    ) p* h4 ?* r4 K8 f0 Z: X# c
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    & \7 `# U* I( q7 u: G
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    # S' N' X7 z5 D* P
  24.   DEVICE_STATEMASK_ALL                  = $00000007;" y  d3 L8 N" C2 @/ [; O% u1 r
  25.   }  H4 Q' c( t, \! u$ G
  26. type
    ! X; m0 \8 y9 k; C1 R$ m2 u9 S+ m0 B
  27.   EDataFlow = TOleEnum;. E  u- r+ R* ?% E+ b  v; r/ W
  28. 6 b  r+ t  w5 b; j. @
  29. const
    ) j8 _5 l3 @+ E0 P. `0 s
  30.   eRender                               = $00000000;
    % k: A; p& J& ~' N& x
  31.   eCapture                              = $00000001;
    ; l+ }' E$ c* t. S
  32.   eAll                                  = $00000002;
    $ W4 P9 L; n  P5 g) N1 P2 Q; d
  33.   EDataFlow_enum_count                  = $00000003;
    - N% i1 n( T5 @! Q; h/ [
  34. # g2 j- @0 V& M/ @" h/ E
  35. type
    # u  `" f0 r& T8 |3 z) Z  ?
  36.   ERole = TOleEnum;
    7 e- `: ?. G) y& P3 B

  37. , g* q6 h! I( n0 D1 v9 A( s* l
  38. const3 O/ I4 ^+ W  k6 M
  39.   eConsole                              = $00000000;
    3 X9 x  _* k1 L6 o. J) g) L9 Q
  40.   eMultimedia                           = $00000001;
    ' `( `) i8 x% u; q/ a2 G1 {
  41.   eCommunications                       = $00000002;% a- a2 U. A: m8 ?5 d
  42.   ERole_enum_count                      = $00000003;% a3 z# l$ h- z) `5 a+ }
  43. 8 h$ z% B" S. ]' \+ t
  44. type
      E4 X8 K3 q7 I  p! e& u
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)" y: p1 f; j( v. `4 h( F3 N% ^4 h+ V
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
      ?8 j* E& C& {6 }
  47.   end;) s4 f$ J) K$ t' p

  48. 1 \4 m& C4 J  w- Q/ D
  49.   IAudioEndpointVolume = interface(IUnknown)
    , [* ~. W% B+ q" r% ^, q' _
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    ' j7 I/ s, w" i- _- ~2 `- T
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    0 C( f6 n& o* V1 L4 m: e, _0 x, b
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ' J0 j, F7 w+ f  ~! @
  53.     function GetChannelCount(out PInteger): Integer; stdcall;6 O( t7 }6 ?, q
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    : c. C% @' H% T* \0 I; G
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    2 w* r5 B0 E- Q2 {2 Y) j1 F
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    ) R4 k# p) }  f" b) ]3 }, }
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    2 L1 V0 C) r$ l, T) M5 N
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    * J4 G7 W9 C' ]: J) v: k$ u, N" a# I
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;* q6 ~0 E  @3 I- L; c
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    # I& u9 {  x/ U; s6 H) `
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    " e- A5 Q# v9 ]. `4 k
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    5 e/ A0 Y' E% g6 q
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    & e  X- Q) A# V! I/ G0 \
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;7 h# U3 L. g8 b& I" T
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;4 [( P: s. ~$ M& X* n
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    * f, c& H# u. n. ^" n( d, B
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    7 A% a0 [! Q# q0 Y& o; m
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    % m* r/ }& s# O; m
  69.   end;8 D; Q& Q5 p, _4 D0 D

  70. 1 |( \$ e6 u3 \
  71.   IAudioMeterInformation = interface(IUnknown)! H6 B2 X+ }; K) ]5 |' a
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']7 @+ |3 Q  Y  g7 N2 H# y# ?9 \
  73.   end;/ K' i" g. P/ ~: @% y
  74. 0 l0 b: [  x/ y- T: ~, o
  75.   IPropertyStore = interface(IUnknown)- h/ K8 O: {+ S  X
  76.   end;
    / R. R" j4 a' o4 @) R
  77. ( V( r+ P) E1 t5 R9 [% W: a
  78.   IMMDevice = interface(IUnknown)
    . Z1 R7 G% _9 S/ Z* T, [: Q
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']3 E% j+ i1 m8 y, s' q% U, w
  80.     function Activate(const refId: TGUID;
    * N, q3 m0 @& V8 B
  81.                       dwClsCtx: DWORD;" a, [7 }, R: x8 [9 Z# Q* X
  82.                       pActivationParams: PInteger;6 E7 ~; k& k% Y; |4 b. ~: t
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;. V$ S2 ?( ?+ A# }3 V5 H3 c
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;! C; |2 P* E0 C
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    # q' @% b4 Z9 K/ J+ R
  86.     function GetState(out State: Integer): Hresult; stdcall;
    1 v& z/ \6 }3 g3 v
  87.   end;6 q7 k) O! j6 t3 n/ {: B' D- e( \
  88. + Z6 F0 Z+ x' d! r

  89. 2 M+ I/ P$ w' A& I' D9 E
  90.   IMMDeviceCollection = interface(IUnknown)2 e" V! t1 o) X; u3 Y$ D4 x, Y8 I
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']" [# f6 R0 f" C% e/ K& N
  92.   end;
    ( s$ i7 ~) K" A7 u
  93. 7 V3 q( L( E) E2 y0 ^# ~: ^: m
  94.   IMMNotificationClient = interface(IUnknown)
    - P' A1 e1 G5 r5 p9 C  b5 e
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    7 s" K  w* A8 h/ e9 \* x8 P: H
  96.   end;" `9 g/ P" u$ M% _' J
  97. 1 H5 ~) u; r7 c( d( W) l
  98.   IMMDeviceEnumerator = interface(IUnknown)
    7 m3 P* a# t7 j& t
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']  u( P5 ]% D& g/ a! E7 i1 M
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;* X( N5 |! \; |/ `2 @$ Z
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;% i* E( I; u. z- P/ v. t' T
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;) l0 u- s' s& _! H
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    1 p! u, F. b# _3 N2 Z
  104.   end;0 p. R8 R3 i* h: {, P! F$ `" m

  105. 5 j1 y, g- e4 B5 z9 @% ^
  106. implementation
    8 ?0 U  X3 j$ q

  107. ( R+ z% @+ \9 n. G4 M! I
  108. end.$ k. J6 J/ ]5 v6 Y$ p' s

  109. ) X3 p- B: P- ^
  110. ///////////////////////
    , N& j; p4 c/ t
  111. simple sample :)
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  112. ///////////////////////2 s; E9 ~. z7 n% F; m
  113.   t0 b1 w/ m% O' i$ J( _' R7 T7 o
  114. //...... other code% U- y4 E( L% Y6 m

  115. 7 A+ w9 F: s0 H/ _
  116. uses ... ActiveX, MMDevApi, ...;
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  117. ( i' e1 {/ h7 [* ~8 |, ~
  118. //...... other code) U. a/ Z% F4 Z2 n

  119. . ?/ r% O3 h8 O3 A  v& u! k
  120. var8 V/ |  y0 |; C7 b
  121.   endpointVolume: IAudioEndpointVolume = nil;
    ! s  z) R4 g; K  Q1 J9 ~
  122. 5 n9 k- b+ t# e3 N
  123. procedure TForm1.FormCreate(Sender: TObject);
    9 f- A! G3 I# {( x' {
  124. var
    : @" i- l3 f- E) n" X1 K  B: D
  125.   deviceEnumerator: IMMDeviceEnumerator;* a9 j9 O. S: M) w- P
  126.   defaultDevice: IMMDevice;
    $ y! t& C6 N  B
  127. begin; t2 x6 \% `, v/ l- u* B
  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);/ o5 H5 L3 \* m4 l) m0 C8 Z
  131. end;
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  132. ; G" X# B& x4 u: Z# ~
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var' m. L1 B, {* d/ V$ K
  135.   VolumeLevel: Single;
    ; Q# U% }- N6 J/ w
  136. begin
    % A# u4 h' _2 ^; h5 O  I* j
  137.   if endpointVolume = nil then Exit;% I$ C4 u. S6 c) D7 B  w
  138.   VolumeLevel := 0.50;
    , ]: {" D5 o' R
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
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  142. 2 D% B) P% n5 k( I2 w+ _, G  {
  143. /////////////////////////////////////( w: [2 w7 Q/ [7 Y8 [

  144. 4 q- L6 l- r* i' t7 Z
  145. // with best regards ToxicDream
    . ?9 E, _+ [" G
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