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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
6 l0 K+ M! p: @7 j% k4 QBy Mukta & ToxicDream
  1. " q8 F- K4 Z1 B% _2 B! m( L# m6 J
  2. //for delphi 5
    & C: b* K4 h$ x
  3. unit MMDevApi_tlb;
    & w  d0 x' t2 |4 l  G) e

  4. 7 z, k' \2 |& n+ S9 D8 P0 ^. P7 O
  5. interface
    / Y4 k0 G- v& I: J" H+ P' N
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    ) f3 R9 C$ d; I# L
  7. const6 h& |- J0 }2 r' r4 ?
  8.   // TypeLibrary Major and minor versions
    1 `  T3 l  [# x! p+ q* j7 |
  9. 0 ]! h4 s" R6 l* @( ~/ M
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    . ?3 {8 G& i: e  x
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';$ ^( ^! W; T1 q) P
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    $ p5 y3 A$ j1 K* P( a1 l% |
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';( {$ q3 }# ]+ G; ?: X; j
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';" o5 w# d. [4 K* k6 `3 Y2 n: C# c1 T
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    $ k$ D) ~* E. T- T3 Q( S
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';+ l  r! V4 t. ^' J* P
  17. + W+ Z, F8 u  ^. K5 X/ v
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    * E" s* N' G7 I
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;# B" {0 d+ }1 x* P; _# j& J0 G4 J8 T: ?
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;$ Q; z5 Y3 H0 m0 @' x
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
      n: b' ^" V$ H) G, V3 t+ D
  22. 8 X5 V, c8 K* P1 y0 T& }
  23. type
    ; G' o1 p1 c  U, A& H' T, `
  24.   EDataFlow = TOleEnum;
    / b5 Y. y. v1 g- B! a5 p% |
  25. const
    . \# Y, M8 d8 F5 _1 Z6 |- `
  26.   eRender                               = $00000000;; j5 X+ K% z( e( u+ k: c
  27.   eCapture                              = $00000001;. e7 Q2 f$ Y! a% }) @: g  K
  28.   eAll                                  = $00000002;
    * m! J$ q' B9 m- e
  29.   EDataFlow_enum_count                  = $00000003;
    4 Y$ T+ `5 M# V& ]8 p

  30. 3 R! C, ~8 E' i
  31. type
    4 n5 U! V) O2 |3 a3 O( @3 B7 C* F
  32.   ERole = TOleEnum;( v; u" k. N5 H/ K$ N  O7 d
  33. const. l7 W- e1 O1 B( z- q0 j
  34.   eConsole                              = $00000000;
    % u# d: r( f) j/ d" r* t
  35.   eMultimedia                           = $00000001;
    5 o3 E# _4 v/ V+ r5 F, a8 q6 p
  36.   eCommunications                       = $00000002;
    8 _- K" m  I5 Q1 x2 s6 {; o
  37.   ERole_enum_count                      = $00000003;
    % G2 Q/ J0 {( c5 D, ?
  38. 4 t) T7 I$ k% T- O8 C% u# n$ v" Q
  39. type
    ) J0 r; h7 P# ~1 I* A/ s) y) M: J
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)- e% o4 G8 t' v9 X
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']+ D1 I6 V9 Z) A+ S( C# w5 P
  42.   end;& m/ K/ d2 J, r! d, i# L

  43. 6 @. A7 u3 r  z2 R3 E: t
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    + [% i% I/ ~0 s" O; L
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    4 e8 v7 }* e6 w. u8 p
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;% {! U9 k! z2 d! N' G, t$ _% u7 ?
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;& L- D- A, _7 f2 i( n
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;7 {3 e' L' R# s2 u. w/ \9 m5 ?
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;& V: Y/ c9 b+ ~, s, @% a
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    . u6 S, U" ?, p6 N$ m4 {
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
      p6 f' M9 ?' ?/ c: p* `% t
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    " G; w" J% q# Z* i$ N: ]! @
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;' ]- w9 T" n/ V4 _! }0 ]
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;/ D0 D( K5 s+ ?
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    ! ]" p% @" i( w# \' I; [
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    1 W6 P+ C* w1 B+ h: V, e
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;3 u% `+ n% N# d) k$ T
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;0 _# \- ^8 @/ T/ `3 D) y  L
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;$ M* D5 G" c1 T  C! |3 M7 {. G
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    ' M$ H) n) t* w0 K2 J
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    . x6 ~! G3 g/ K. b, f9 G# L
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    . h3 L9 g% n9 ]
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;3 E0 X1 d3 y+ c1 O$ s& v
  64.   end;" q7 x% u2 D9 M5 r, S
  65. # X1 S/ y1 E8 \9 {4 W- L
  66. {  IAudioMeterInformation = interface(IUnknown)
    ) ]9 h8 C4 y; I- `$ h1 M
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    8 ]1 s) [2 G; K# d. ?
  68.   end;}$ a8 Z9 n( X& E9 J  F! h
  69. 8 t* A& g1 A& t2 e& T" M
  70.   IPropertyStore = interface(IUnknown)
    * B3 m* ?1 E3 i, T/ Q- y: }
  71.   end;
    9 ~. x4 }6 Q! Y
  72. . X9 O9 \) K4 N* q0 V. _1 J# t3 K
  73. type* P0 A. [8 l% U- o$ c+ i. C
  74.   IMMDevice = interface(IUnknown)/ v+ M3 {2 \. B+ C! o+ Q7 e0 D
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']) ]- s( |2 E9 D4 c8 G: R
  76.     Function Activate(  refId :TGUID;5 x1 [; C6 u' X. L/ O4 s# J8 [
  77.                         dwClsCtx: DWORD;
    ' i! L. L5 V5 K
  78.                         pActivationParams: PInteger ;
    : \; j8 [+ M1 H. R
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;, ]. `0 b$ r' o5 }
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;# u; ?3 i+ ~' h$ c# o" i& A
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;& a1 `" H* a, X) x. l
  82.     Function GetState(out State :Integer): Hresult; stdcall;! C4 o9 O0 W  `! `) o1 e

  83. - ^: C/ Y% w" `
  84.   end;5 E) |1 o" f/ k0 }: X% F6 c: {/ P

  85. 0 [+ f& n- D, M, f$ _4 S
  86. 4 _8 w, Q: C7 B, M
  87.   IMMDeviceCollection = interface(IUnknown)
    5 x  @+ X1 V/ i/ |
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']7 i/ n: _* b  k; w% w
  89.   end;6 z" i( C! t- W: |* b5 q. U9 n  H

  90. 2 B$ s9 v1 d+ {1 E- A
  91.   IMMNotificationClient = interface (IUnknown). z$ Y* j; v7 ~0 F
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    9 @  V. M/ z' x8 A' W
  93.   end;# |' W% |: ^0 T+ p8 j+ S
  94. . ^. @0 d+ w8 h% K6 V5 n3 f: l
  95.   IMMDeviceEnumerator = interface(IUnknown). i, j# @8 H, _. G4 |
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    7 s* x: m" O$ `4 \
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;. p* n& o# h& P. R; ^
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    7 i. C1 n: V& Q
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    1 L( `" E1 V8 L2 [% ~* R/ W
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    6 |  [7 _) r' I! _5 L, d8 x1 ~
  101.   end;
    8 a. v+ X1 u, j1 B

  102. % H- |0 _1 ^3 ?; a8 B
  103.   implementation
    9 A& C0 l) Q- c& v" g& p
  104. end.
    , \' C# H3 T+ p1 F5 T
  105. ! z, s& R- J7 A. j
  106. Thanks & Reagrds,$ N+ H& E& Y' l. g5 V/ Z/ q0 X! K9 |
  107. Mukta .... c; F- R& P& V+ K( z2 G7 q0 V
复制代码

  1. % Y" V  {, {3 U  J
  2. it's work in Delphi 7- X6 ^3 k, e$ p+ O* g4 M5 h1 g) M- c$ o4 Y
  3. //////////////////////////
    : M: o/ x$ o% c! T3 B* a
  4. : Z6 l3 g  u- Z5 n  L
  5. unit MMDevApi;
    . U, K* |: D" K- i5 x# e9 x7 b. L, N7 F

  6. + B2 U# F9 Z5 E1 q
  7. interface
    ( a8 r# j. Q3 k, A9 n

  8. , d% l$ d9 |' @8 L7 |, z: \
  9. uses
    9 z3 U( }- s8 I( o% f2 X, W2 T
  10.   Windows, ActiveX, ComObj;
    + X7 `. _5 ^1 X( ~! r, u

  11. 7 e, c7 A; \: u2 D" X5 j; p' M
  12. const
    / z8 c+ B* w" J( B/ f4 x6 N
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';" ^, P* e  c* [# }: m$ C" l; J- N9 h
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    9 ~) f! P/ q0 L+ Z& P5 W: {
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    5 b& D8 f. _% I# q) E& z: d. w
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ( O' |3 K6 w. O' z/ L) g' G
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';, s* A5 `' B, N4 h/ G" i
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';  e9 B; l" j+ ]  m3 `2 @* A
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';' Q! [5 X; J' _( v7 `) x1 T. h1 y

  20. ( r; s9 }9 }9 Z9 p8 }! m
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
      W% O% _" S5 M; z' i& u
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    8 i1 j# J' k/ O5 S+ c( H  f
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    : Y  x9 w* @. m& U# F! ]/ X! x
  24.   DEVICE_STATEMASK_ALL                  = $00000007;( G8 r1 {: Q! |5 F( t8 I- y& X

  25. . }' ?; c, F; M* H9 ~
  26. type
    - E; f/ M: r2 n' {& M" B
  27.   EDataFlow = TOleEnum;; T2 K& v1 a) y- ]5 B% ~; z& w
  28. 9 ]/ C- T9 \1 k5 x& W; }' a- u- U
  29. const
    " b3 O7 |" ?: t$ _8 U+ ?
  30.   eRender                               = $00000000;, X' Q8 Q' {! D. W1 l
  31.   eCapture                              = $00000001;6 A  |& [7 r5 {# m4 [0 H
  32.   eAll                                  = $00000002;
    ) @3 ~# b7 E* i" y. w, j
  33.   EDataFlow_enum_count                  = $00000003;
    2 S1 n: t* h( L' x, U3 X

  34. ( ^. c) F, g* z7 m  g( A* t/ @
  35. type: j0 r0 _+ ^1 N$ V% Z% Z1 E9 f
  36.   ERole = TOleEnum;
    3 P8 Z- q: M+ C" N$ K/ \

  37. 2 B& L7 `, X& J! b6 p6 d3 N
  38. const
    ' e  n, a( K) l2 K0 U
  39.   eConsole                              = $00000000;
    1 N" N1 T0 s. D/ }2 M' o2 V
  40.   eMultimedia                           = $00000001;' X( Q+ w( [/ K& ^" e- X
  41.   eCommunications                       = $00000002;% k+ F& [5 ~8 l( O
  42.   ERole_enum_count                      = $00000003;1 H9 s0 F- }  z5 G6 h' i
  43. ) {4 c+ Q, I2 a' U. p7 }
  44. type
    5 _+ l1 B" J6 v+ l8 q+ T2 o0 \  |$ i
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    ' y: _$ r7 Q- S  [
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    ! i! J4 A. T( ^4 w3 C$ d" i- M+ P  N
  47.   end;* D8 A. z9 k: O% X7 ~# E
  48. # |5 ^8 @- [1 `# O% W
  49.   IAudioEndpointVolume = interface(IUnknown)7 [' y0 J' u& r# x2 n2 [( j
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    % G8 r4 h8 s4 N0 S& h& C
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;6 B, v: x: v) Z; A
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    # d! V9 g  R5 I! o9 U5 t) @1 `$ _
  53.     function GetChannelCount(out PInteger): Integer; stdcall;0 K, s' I1 j# m
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    0 `0 `6 `9 Y, L3 h
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;( |% u, [: m5 |" p- d4 r7 P/ x; C
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    - N' N" a; _7 W
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
      M/ o* A+ A* [( W6 J8 S
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;+ H( W! L/ w/ V) o6 ?  M* T: p
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
      V3 b* ?# n2 N+ j  `
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;% w; h. f4 Y$ e5 `
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;+ G2 n% t) G) F6 A: [, j6 {+ A, L
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;! n- e8 u5 y3 R. x" U0 \
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;5 J7 H1 h4 X/ I$ q- Z+ U- I2 Z
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    5 ]- m3 p- {" P  T
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;! I. z' i" t  D% N/ w- G. {
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    - l' t1 R6 A. T' y
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    : D! X2 Y: k( z
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;- B6 e" D) f6 \
  69.   end;
    / O4 `$ x, a5 J1 @
  70. * k* b9 w8 ?; O% }
  71.   IAudioMeterInformation = interface(IUnknown)- [; |0 y1 h% F! {' e. m3 u) i8 ]
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
      R7 L# _% i, N* \9 G1 r" _4 `
  73.   end;( L6 ~* F7 \) ~' H) ]; m) W, ~: I

  74. 5 x7 Q) o; i. }5 T$ v6 J: b' g
  75.   IPropertyStore = interface(IUnknown)
    + o$ n2 d& F4 U+ `, ?
  76.   end;/ p6 d3 A: Q. o- I& D; m( i
  77. 8 x* Q4 W0 z; D
  78.   IMMDevice = interface(IUnknown)
    2 g( l: \; x: \( X
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']4 P  ]1 u$ k+ B8 ~- Q+ o. z
  80.     function Activate(const refId: TGUID;5 T' E" q/ w; I9 P* N  H4 g
  81.                       dwClsCtx: DWORD;8 \3 p! C+ i4 s3 X) B
  82.                       pActivationParams: PInteger;- n1 m; c! h0 W. t
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;' n4 |* R5 O  E) s( l
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    8 x& x. ~1 I4 _2 V8 W, ?
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    ) T2 K/ a1 f: X8 s# j
  86.     function GetState(out State: Integer): Hresult; stdcall;
    , Z3 B: q+ A1 ~
  87.   end;
    5 c: a3 y' ~; A  P" G8 k

  88. " J7 a! z; r' M' c1 S
  89. ' W5 k. ~$ w& J- t/ N: q; y
  90.   IMMDeviceCollection = interface(IUnknown)
    + `- J% n- R, i3 C- W( k' J  N( o5 f
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    8 J( s- [8 z2 L& a
  92.   end;- d3 ?5 O  X+ S5 }( r% @0 t

  93. 2 `& B8 t4 n0 B5 U0 g8 V( u
  94.   IMMNotificationClient = interface(IUnknown)
    $ F: u5 Z- Q7 `+ _) A6 J; Z8 t
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    ! p0 V% u: z' q, d. M
  96.   end;0 N5 C- o' ]8 q# ]1 B
  97. ' o8 E3 t4 R, w' }$ K4 R" d
  98.   IMMDeviceEnumerator = interface(IUnknown)( b1 T: F/ _: V+ \
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']: y  `0 Q$ L+ O2 P5 j
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;# r2 ^& Y! O5 r) [+ B# N, c
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    1 D( j! m* Q& f: W2 ?' i: G
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    / J( O1 L2 b5 T
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
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  104.   end;$ b4 D* w1 p, {4 r5 D$ V
  105. - s$ K3 Q) J7 T6 l2 |4 s6 n
  106. implementation
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  107. 9 B5 i1 a+ _5 C( x& z( i* D5 b: n
  108. end.
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  109. / `4 \- v0 n1 @# q! G
  110. ///////////////////////
    - G  z1 L6 M/ p' c6 U; |) B" E
  111. simple sample :)5 h& L0 c: A, I! I* B5 c( r: C
  112. ///////////////////////9 P+ u. ^$ S8 b, u. {' }
  113. % k* o$ P/ [7 \: e" B& a( W6 ^
  114. //...... other code
    8 |/ y( ~) n) _- m: R) V4 h; \. V
  115. 7 G  K5 q4 F# J2 h6 ?
  116. uses ... ActiveX, MMDevApi, ...;* w4 n) S( s$ ]1 N8 v7 H

  117. 3 F5 }: J! O, [0 s, d
  118. //...... other code) A) A, b' O2 M3 @, \
  119. 6 G+ ?6 [" {* A
  120. var( J8 n3 r. H8 s% Q6 ]
  121.   endpointVolume: IAudioEndpointVolume = nil;
    2 E4 Y3 Q- V3 k6 a- a
  122. * k5 Y) n+ S' R) x! b4 [
  123. procedure TForm1.FormCreate(Sender: TObject);" U: ?0 O! _& P
  124. var
    - x: Y( G9 P( t+ |% C( N, c
  125.   deviceEnumerator: IMMDeviceEnumerator;
    , ^+ z, t+ v: d
  126.   defaultDevice: IMMDevice;6 F) g) I5 [2 E- G; w- _
  127. begin
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  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);" s3 j4 u' ^1 E
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);6 h" Q* l8 p: `" p" Y+ }' N
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);+ ?* Z9 B! _3 y5 }! h4 a; ~
  131. end;
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  132. ' N% ]+ d. H; G$ L
  133. procedure TForm1.Button1Click(Sender: TObject);9 q  c, \$ B4 W. }+ x( P
  134. var) I1 i; J8 p) z! l7 y
  135.   VolumeLevel: Single;, J; m7 ^, w" I
  136. begin8 _+ |1 S+ [0 h' U
  137.   if endpointVolume = nil then Exit;
    # q3 [9 r/ }; y) D* d
  138.   VolumeLevel := 0.50;( M( C% t( h! x" O3 _9 K( p$ s
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    + m! Q# n; ^* _
  140.   Caption := Format('%1.8f', [VolumeLevel])& ^3 r8 a: P# ]% u
  141. end;( M4 o, ]' r' k$ P% W3 n
  142.   C: ]; W6 q' A
  143. /////////////////////////////////////
    . ]3 S# D  _: m. F8 W; G1 R
  144. 0 V  v, q0 A9 F, ?3 p- J( _
  145. // with best regards ToxicDream( s0 {" t7 M$ f5 a3 h1 v' f" w! S
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