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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
- l1 L- K! f& m' A, {8 WBy Mukta & ToxicDream
  1. " [7 H. l& l5 i- ]0 F
  2. //for delphi 55 P: G) B: I- Q) K7 M
  3. unit MMDevApi_tlb;5 L- J" d9 G& e7 \  \
  4. # S$ b4 L% n( J, E
  5. interface, y% |0 D" _7 ^6 s
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;  g) a, f% Z, P+ u/ b
  7. const
    : \$ O  `# h& a
  8.   // TypeLibrary Major and minor versions
    0 _( n2 a7 {, K; e) S* I/ O

  9. ' c/ z6 O' u. h4 t: T7 U
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    , G% ?8 D" L3 F0 ]# D. k
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ) I4 L! `" S7 ^0 A% V8 J# W
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    2 X: ?& B& x9 [4 t- ?7 N
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';1 z/ P2 ~2 U) B7 r. y! J# w
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';# c1 B. t+ L1 S7 j2 R
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    ' ]" d; B( \/ G8 C6 d9 b
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    & }) u( c! q3 q' Z0 V0 @. L0 V) G
  17. 2 j4 D, c" z- d* T+ |. U7 t) ^% X
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    ( m- X6 ]/ y( V* M* b
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    $ E! d+ x$ D% D+ B- j3 r
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;4 G, x- X& n4 q/ Q
  21.   DEVICE_STATEMASK_ALL                  = $00000007;) e8 I; G% A8 x/ M  l. N- L+ O
  22. * U! J% u9 L, H- B* ^( ^
  23. type
    5 X; R! G) o( {- P) N5 O( |
  24.   EDataFlow = TOleEnum;
    / D& s% O! e- ^9 ?  a; p$ ^. Q
  25. const
    " H' T8 \; Z0 i1 b. V$ ~( B
  26.   eRender                               = $00000000;6 {, k' O) X! P, p' Q3 A2 w/ M
  27.   eCapture                              = $00000001;* r9 T( \+ Y  b
  28.   eAll                                  = $00000002;4 E5 m* c; v( s, {: Q& n
  29.   EDataFlow_enum_count                  = $00000003;& S6 }2 d# C+ }& b. \: o) I7 W

  30. + I, |, Z4 i9 i8 a) t; r, s' ?
  31. type- M5 \# Z; k0 ]" d( f
  32.   ERole = TOleEnum;) I6 `$ [: X/ V+ _, V
  33. const
    7 d1 n( V5 x. ]7 ^- K- w' G, A
  34.   eConsole                              = $00000000;
    0 t, ^- _' g1 r# {/ y6 ]: M
  35.   eMultimedia                           = $00000001;
    - o4 b7 ]; x8 j* U
  36.   eCommunications                       = $00000002;
    7 `9 B- {/ ~: c: G9 U! U# R% g2 ]2 j
  37.   ERole_enum_count                      = $00000003;
    7 o0 d' q  q% ~* f
  38. + B" j0 c6 E1 l2 d' d2 L6 l
  39. type
    ! q/ r# M) |/ [; b; m: q; B
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)6 I% Z1 ~) L8 c8 u
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    + ^( Q' u6 j+ u! U% |1 u
  42.   end;3 N$ c1 n0 K6 y& n5 f* n! l' t

  43. & A: E6 ~  X8 B; W- C' @6 c
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    # B; I1 s( K8 m8 C, {
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']6 a. ?- D( Z7 M$ \! D9 d
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;2 Z: M# T$ v: g8 i) ^- S
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;- q7 w. |4 Q* z, I- ]4 p' {, X+ i: k; R
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    7 @- `% I! c7 m5 j5 ^$ z
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;9 C( b$ P. Z# b; F7 g
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    5 |5 R% Q. @$ L
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;& s9 V6 G  f% I2 Z7 l0 R, U
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    ! ?5 m* e% T4 b
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;  I6 u) c( ]' q+ V. `& k
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;# L9 V  E0 K$ f* n
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;& T$ o& R4 k# x9 G' V' I
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    8 Y* z6 @5 ?0 t, L7 ^+ S8 {
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;3 U$ Y2 ?) j6 Y) I6 @- s* [7 s
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    # C; d/ ?! E. k9 n9 I/ s# L2 G* n8 z, ?
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    ( V- \& R" y) N; P9 G, ?
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    . }! T1 U; Q& }4 V% N
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;5 t/ z# f( H2 h: w: f# D0 ]
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    ; g% ]9 u/ Y) G" \; A
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;+ k2 V, s9 ]/ V- d5 M3 s. _
  64.   end;
    1 n0 ]  m) g" y* }1 G
  65. 8 c/ W$ F" T9 P" I! h
  66. {  IAudioMeterInformation = interface(IUnknown)
    * K0 v4 {! h, D2 b/ H
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    : R" G% ^, m' N; |( t9 T- m! O% R" X% M
  68.   end;}) N# d6 l7 H4 u& K& u
  69. / l- [0 q/ d. p
  70.   IPropertyStore = interface(IUnknown)8 Y- V2 h8 q+ _% Q: y8 B2 Q2 s
  71.   end;
    # I5 ~' _, h" {. r/ F

  72. 5 i& \) q/ i, A* O$ M8 i
  73. type
    & H0 ^8 r! S* u& \+ W
  74.   IMMDevice = interface(IUnknown)- [: \; S% q' u% I  r" y
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    * u6 a: W% O2 s
  76.     Function Activate(  refId :TGUID;
    9 d. K9 p* _, a9 W/ a5 E$ E
  77.                         dwClsCtx: DWORD;8 I# ]! O1 N) T* ^: T- Y
  78.                         pActivationParams: PInteger ;3 t7 `) T( E( p6 ^) G
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    . b  }2 A! E; @$ W0 O
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    ; {8 Z2 ?' L* b$ o, S# B
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    8 [, Q% N+ l' `0 M, m) @4 E- B
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    ) Z5 P! O7 O2 F# L4 }' `7 {

  83. ; W/ z/ @) H, A# Q3 _2 P( T* ^# V
  84.   end;
    / j$ {3 }; a. C/ t! l3 @

  85. 4 X9 \9 I) ?6 U+ H- }* m2 J0 W$ z2 {

  86. ) }8 t9 L" s* S" ~/ |. W
  87.   IMMDeviceCollection = interface(IUnknown)* u" x( j. w* U3 F/ r
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']' v# R# n% C5 l( p$ I4 k
  89.   end;
    3 r* E: D- I5 @4 ]. V& M

  90. 7 z! j% Y( ^/ W% e1 ~8 `2 W) g
  91.   IMMNotificationClient = interface (IUnknown): z8 p4 L' x" m# s( K9 Z0 ?
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']- }$ [4 q& |( M# j% e
  93.   end;5 c0 t" t' |1 \9 ^* C

  94. 5 N0 L" M3 M& c5 m
  95.   IMMDeviceEnumerator = interface(IUnknown)
    $ D; L) I7 a% U- ^( y* K
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    * w- R- b3 Q/ V) r% I1 U1 ^$ ?5 {7 g
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    9 J6 Q6 l+ \. X
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    ( s7 i, r/ s+ H- j6 ^4 B7 s
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;+ g5 v4 E+ |) G; |
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;2 D8 s% Y" f- }. Y; n
  101.   end;1 N. P, Y) O2 U, t  i

  102. 4 Z+ k/ p$ e$ U0 F
  103.   implementation% [6 T& ~- }- A3 b, t" `
  104. end.
    % S9 f. |9 C- u( i+ ]

  105. , I. U3 D) A5 W* y0 L6 q. i0 S
  106. Thanks & Reagrds," y% V( I) O  b) @+ y: ^) j: J3 N
  107. Mukta ...
    2 ~6 ^, w) n0 \  v
复制代码

  1. ' u4 W2 I1 h( D- Z
  2. it's work in Delphi 7
    ) r9 j) O; C, o6 w' g: a
  3. //////////////////////////) N7 v* T( U6 q& z1 ~
  4. 3 x8 w: t9 l; l/ \6 y
  5. unit MMDevApi;
    . L% f/ J+ W( M! f1 u$ H' p/ y3 o+ h
  6. & S4 O& g* u% _: c" b2 Y% h( e
  7. interface
    ( f* V7 n2 P/ X6 n' g2 F

  8.   c8 |" T8 e7 U& F/ p% L0 k
  9. uses& P( d$ Q( G) c+ S) c, V
  10.   Windows, ActiveX, ComObj;+ |  i8 F4 H. n% P) B) j

  11. 9 T0 ]' m% ^7 M% g
  12. const6 u9 a& J# a% `+ m# I/ w
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    ( C1 S% w* ~! A9 o% P
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';; ]+ e* A/ Y- G3 `
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';6 d$ M( e! w0 ~
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';5 u- i3 P! u/ o( n1 }
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';+ T$ ^+ n' V2 h6 r0 c+ Y7 h" u
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    9 f- v: ~. r% Y* Y# f0 C
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';$ x' x, W1 w# e0 U$ V6 w' i
  20. ; Y6 b2 M" {' ^; K: L
  21.   DEVICE_STATE_ACTIVE                   = $00000001;1 a) I6 _) E; D! r: p& S
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    - o3 G! {9 D+ Y- P
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    6 T, g' S* p1 z/ {# j! Z! t3 L# x( Y
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    4 s8 m5 X7 e; y2 ^! [$ e
  25. 9 [& T8 j. o9 i3 O; t# F
  26. type
    & F' @! |3 }& Y5 ~. L; q0 U
  27.   EDataFlow = TOleEnum;' g, W, K, i( W( y9 u1 `! j$ u
  28. 1 ?" G0 h. S' K& w* o
  29. const
    0 o0 y, J1 W! ?
  30.   eRender                               = $00000000;3 s" Q1 ^. v8 e
  31.   eCapture                              = $00000001;
    % [" O" @* X( L% F! o
  32.   eAll                                  = $00000002;1 ?$ Z) o9 @1 L9 r
  33.   EDataFlow_enum_count                  = $00000003;
    3 e4 Z/ J+ F  L: N+ X

  34. 3 m1 ^1 E. ]: p
  35. type% U2 t- H# o0 V! E, z: W
  36.   ERole = TOleEnum;
    . Y5 v% B- o2 q" ?! ?8 i
  37. 6 k3 \) i/ t* Y  T6 |0 x$ k! l
  38. const# G+ R! ]$ X/ d) N% ^, y+ p6 d% _
  39.   eConsole                              = $00000000;- m- T- F1 z- T8 J- ~$ B
  40.   eMultimedia                           = $00000001;) M" n6 n$ H. w- K4 ~% b% H7 z
  41.   eCommunications                       = $00000002;( ?: t6 S( r5 p
  42.   ERole_enum_count                      = $00000003;" P7 p/ X# a+ X( C7 _5 L$ E/ R
  43. $ p5 G! G0 b6 }  a
  44. type" i! E3 z( M# b* j% W7 C
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)5 G/ b- Z( h! l  `0 ]. t- }
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']. v, ?4 b3 x' k; W; |: p* r' _
  47.   end;
    * K/ `. f( g  O& q* `

  48. $ z" L0 ?' _) E4 e6 u  L: X
  49.   IAudioEndpointVolume = interface(IUnknown)
    ) V& a( `. X) M4 b4 S" g
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']" i3 p  h" q) ], i" u! ?  M( k3 h
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;% o8 f$ G& |  h; Q
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ) R3 W3 E- L& z  R4 X$ K
  53.     function GetChannelCount(out PInteger): Integer; stdcall;- e7 _3 v) \% g& l
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;( j/ v+ [5 `: {. ^& P
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    + p& C0 e7 c# r5 K' K% {
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;$ C- A0 M* O8 Q/ E& d( k# S
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;% h2 f6 O& }; s+ `
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    8 J# A) G. U9 G, q- B  O- x2 i
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;7 c0 Y! a! ]; O" t7 k- X
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;4 w) v0 w, ]" g7 ~
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    5 F# T) u( E, K$ M. p7 o  V0 i
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;( F1 y; s& ~- _8 t' M
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;+ W9 u+ t" Q$ B; H# R
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;8 j0 C" m, }) }: W, N) B8 Y
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    . k( r: E. L5 T! q0 E( l' A  ^# p
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    ( F+ {* m- z1 _* T2 b$ t6 v7 d
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;, |0 z1 q/ `4 h
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;2 V, n: D" E* W6 W) @1 h8 w
  69.   end;
    0 }  d( w% k: K. N1 _

  70. 9 N. t, `! O% @" i* h+ i
  71.   IAudioMeterInformation = interface(IUnknown)1 i6 Y0 V: z3 c! `. K0 S; F
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    ) ?7 k& f5 j/ m4 e1 T
  73.   end;
    * M1 f6 F1 H- H: _) n
  74. 2 m. v0 t! D4 J; y1 C4 ]+ v
  75.   IPropertyStore = interface(IUnknown)
    0 h' H) @$ O- r
  76.   end;' s7 X8 U2 u8 G, O8 Z
  77. ) p: [3 x' _# s3 Y2 l* \
  78.   IMMDevice = interface(IUnknown)
    , U; L; [4 j; ?9 O4 h1 e
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    * {2 O: E  @0 D* v# y2 ~1 q
  80.     function Activate(const refId: TGUID;  p# M' _* ^- y3 l7 n3 o2 I
  81.                       dwClsCtx: DWORD;
    9 O- h$ C. Y' ?+ k; w. }
  82.                       pActivationParams: PInteger;
    4 m+ }$ m  y% I5 t# ]
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
      ]2 h( N5 ^2 o4 u8 l1 f% |2 w
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;9 Y. u3 w7 d3 {& ]. ]4 n3 b* s
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    , v8 A( S4 Y' h( Z5 y7 ]" ~
  86.     function GetState(out State: Integer): Hresult; stdcall;5 o  F) ^' W( a, Q- B/ B. F# Q
  87.   end;4 C+ m/ d0 U  j) Q: j; p

  88. 1 ]4 Z! A9 h8 W, H
  89. + \/ X' p2 b" Y% }
  90.   IMMDeviceCollection = interface(IUnknown)
    9 z2 e) `; x" P* i$ j" A, x0 g
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']0 R/ X6 T* i3 H# ?0 B8 U5 Q
  92.   end;
    . n& e+ F1 ^& O+ @4 O3 b8 p1 l. `
  93. . p: a1 T  z( S; p. Y6 d3 [! R
  94.   IMMNotificationClient = interface(IUnknown); J: {, T  u8 a1 h; _8 g
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']% w+ B, N8 j5 u
  96.   end;7 {( L' f+ p0 n. k; l6 l9 |1 U: o
  97. ' u4 J9 W& U$ _& d# F6 L$ h$ [
  98.   IMMDeviceEnumerator = interface(IUnknown)
    " h- t1 f" l7 E
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']( g( h5 Y# y8 i) C4 d9 J: A% F. ~! V
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
      Y9 G9 O  _1 h' D/ E  i
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    ' {: j, W4 c. Y( W
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;2 M4 ~& s- }( u& i+ [/ }
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;3 E9 ]9 p: _; {% }, O
  104.   end;
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  105. 3 J! A! f: x$ O3 e
  106. implementation& C& N% h. |$ Y! g) T
  107. ) K7 A' r9 N0 ?5 d9 N
  108. end.
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  109. , h  g3 ~# \0 `6 U/ c1 A" o
  110. ///////////////////////
    5 [# d. c9 X! p% t1 z) N  f
  111. simple sample :)5 s) a0 Q1 v; }0 d
  112. ///////////////////////' O' S7 T7 {& Q, S( h+ P

  113. - ~- w, `! ^$ D! X) }
  114. //...... other code: R- ~, F. W# O5 A
  115. 1 U4 X- H) C. d* u6 \8 h  C' p" h' w
  116. uses ... ActiveX, MMDevApi, ...;
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  117. - C4 j( W! h; c# r3 n
  118. //...... other code8 _5 Q% p, E: \- ~0 X- d( S
  119. 0 s) }& J0 I/ H4 B% j# K9 Z
  120. var
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  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. ' p/ R% A" _9 [" h2 N6 ^( n
  123. procedure TForm1.FormCreate(Sender: TObject);0 G; z; q" ~8 P2 b% k5 _
  124. var" x! H" ~# H% S) k$ V
  125.   deviceEnumerator: IMMDeviceEnumerator;
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  126.   defaultDevice: IMMDevice;
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  127. begin* |- ^& d- ?. H3 M$ `; T8 w
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);7 ~4 n* a% R: O+ `+ v9 m- d" ~
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);, }# a5 t4 ], `. _% k
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);  o( M! `3 P' P  T2 l9 z9 o2 m9 ~3 v
  131. end;
    + c: U3 T1 h5 Q1 k

  132. 2 i: O* L5 O: [$ C/ P# @& ?
  133. procedure TForm1.Button1Click(Sender: TObject);8 W% Y2 W4 z  t  x
  134. var6 e  a8 k0 R1 b% q8 O
  135.   VolumeLevel: Single;
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  136. begin. Z! C% K1 K& P" Z+ q7 {# O$ C& @$ J
  137.   if endpointVolume = nil then Exit;: ^% }/ g" B/ b1 p5 S' J" S
  138.   VolumeLevel := 0.50;
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  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. 1 Z) ]7 D+ E# L/ A( z
  143. /////////////////////////////////////& D( r3 \, U6 A" z' S+ L' e+ q
  144. ! f8 P% m% n& i. \4 x; y0 g
  145. // with best regards ToxicDream$ o1 _# R1 L5 L" @6 L
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