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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
, Q7 J* Z  W+ Z8 ]  ^2 d+ [By Mukta & ToxicDream

  1. ' C" b) p4 G4 T* n5 j2 d. H9 _( f
  2. //for delphi 5
    1 e6 b9 J3 _  @4 Y, ^
  3. unit MMDevApi_tlb;
    . t0 I3 e- r4 I1 `. T3 ~

  4. $ V( o5 T0 c% x  z7 u9 Q% ]
  5. interface' K) S# m. w' |, j
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;/ A  y  n/ B6 [* j: H; o4 I6 X, g
  7. const2 R% I9 D4 C; a; B) P
  8.   // TypeLibrary Major and minor versions
    ( L. b: n7 t7 e3 w  ]/ t
  9. ) x7 Y7 w+ y: {( C9 U# |6 w
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';  X" ~  u7 i6 w6 [
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    8 O& x/ L+ b  j! T( ~6 G
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';! h( U( X. D* I% N% O( _
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    + x7 ~- n( C' W# X6 s: B2 M5 ]
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';$ K* V+ ?  X) A8 N
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';* B: p' b# J( i8 }# r
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';9 x! h& e5 _. T: Z
  17. ( X) r( k3 H, e4 i; G7 p3 C
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    6 m' b4 j& A, F5 k
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    - b4 m( X. e3 Q- A, F
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ! u1 @8 ?2 I8 D
  21.   DEVICE_STATEMASK_ALL                  = $00000007;5 Y. B0 s3 O6 l/ X, G. X
  22. / _0 ~! e. M3 Z# b
  23. type: S* ?0 H  T6 }
  24.   EDataFlow = TOleEnum;3 I$ T( y" t# R3 V# G& p
  25. const
    2 L  X( P2 V+ S9 O; s! ^$ H) K$ \
  26.   eRender                               = $00000000;
    + P9 ^0 I. A5 Q. E1 G) D
  27.   eCapture                              = $00000001;+ W" g8 J8 b: Q8 }
  28.   eAll                                  = $00000002;/ C' Z. \! a, {6 I) @! O+ V# ?' f
  29.   EDataFlow_enum_count                  = $00000003;
    % Q# `& }0 r1 o5 r- q& ~7 g& O; M( k3 N
  30. " e" u( J* A+ e- N! d- h+ N( G
  31. type2 o0 _  n: A" {! Y
  32.   ERole = TOleEnum;$ ]  |# `! k) c3 p( p
  33. const
    " |- p% T" x: r7 f: Y" ~
  34.   eConsole                              = $00000000;
    & S, l1 Q( r# d5 F. E1 r* m) N
  35.   eMultimedia                           = $00000001;
      M3 P0 N% ^9 n8 u; N) {
  36.   eCommunications                       = $00000002;
    2 S5 ^7 S* V) n  q/ J9 H0 O# z3 U
  37.   ERole_enum_count                      = $00000003;2 i' ]" A, ~; s
  38. 5 B) T; w5 J3 O% P) v$ d* l
  39. type  S% X. Y3 J6 }& J1 M
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    ) @. l; o; j) t+ c
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    * f  L! n! S; S% J* a
  42.   end;
    2 {( p8 K- D. v+ O7 S# W4 T& E. F

  43. $ d  Y$ D3 \! u/ F; Q
  44.   IMMAudioEndpointVolume = interface(IUnknown)+ A9 E3 k; p9 [( x( k
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    % C6 j5 {9 }' D5 ^! m6 ~
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;9 W2 L$ B! O! z+ ]9 _/ N
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    " k2 s5 U7 ?! p( K/ R- x
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    ( M1 S0 p7 I8 F, q1 s' q  s9 i! Y
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;) E& _  C* K. E* A: @, ~1 |) l5 L8 A; R
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;: `2 Z- z$ D5 J0 p4 c6 I1 n
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    ( ]& c0 c" ^0 Q7 h) \% }* \
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    ! T& L" }: C' g6 c0 L
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    9 h' ]  ?4 B/ [( ]! L. X
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;% ^0 y& s5 R8 j& F
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    2 j3 l5 L. P5 b! m
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;/ u, ?. n) F* y: }9 G" i+ |
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;$ T  P$ h  |/ R6 f8 k
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;3 V( H* r/ L$ ]$ D
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    + S- T8 V: I+ s$ I( g$ x, b! G
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;$ u6 n  p4 e6 [* H
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    ) {5 O. A% N9 X$ H( N0 Y" z% Q
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    . f5 V4 a# C" I) Q% o3 ^
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;) w/ _" O& O) W4 l& j/ Y: J
  64.   end;
    , n$ `! u  C" J6 C1 B
  65. ' C0 @$ O4 }9 ?
  66. {  IAudioMeterInformation = interface(IUnknown)
    , E4 [3 S0 M. _2 {* U/ p9 q/ x# y
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    4 J0 Y/ Z% J" k5 [' b5 ?& K
  68.   end;}
    & l' @9 y! q4 ~9 _* ?
  69. - J. u) w0 P; t# b' U% d
  70.   IPropertyStore = interface(IUnknown)" U/ m2 u, q' |; j) \0 A( ?# e
  71.   end;
    * ^. a1 d: s+ X6 r9 i8 r( O

  72.   Y0 X7 K8 v$ t6 z( ?
  73. type$ }% U7 B5 O8 X, U: W* t
  74.   IMMDevice = interface(IUnknown)
    4 R7 y& e3 t" M( ^7 b+ L
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    ; _: ~4 J4 {5 C/ B7 |4 w( ~
  76.     Function Activate(  refId :TGUID;4 n! k9 T! ]$ Q2 S: d
  77.                         dwClsCtx: DWORD;
    & s# \; u* S% j# o0 B
  78.                         pActivationParams: PInteger ;& W! Y. X. O& V- ]1 @) D
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;. j2 ^, V& I/ U% p: l4 f3 S
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;5 {  M9 q: O/ M/ f) `' i& r
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    . I( f6 `) a- l# |: w
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    3 o% Z6 d7 h; q+ o; Y

  83. 1 d  k6 H2 r1 H$ @6 _4 B
  84.   end;! X0 j% c) [$ y

  85. 6 ]8 a9 a! y% r4 e* K
  86. + X3 C: V2 w; s/ o3 ?& G' P" ^5 }
  87.   IMMDeviceCollection = interface(IUnknown)
    7 K6 k+ O4 K- X6 S& z0 P! K
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']9 a4 V$ e- m$ `; i; f  I2 U" H8 G
  89.   end;
    3 J+ R- s7 k" a8 m

  90. / Z4 X5 O1 W& T
  91.   IMMNotificationClient = interface (IUnknown)
    5 O* m% n4 N: ~. n9 S2 x
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    & l/ e! ^. a5 Z9 @0 q9 b) v
  93.   end;% Y' \2 C6 {; K3 Q

  94. + J# v3 V" Z& t/ l0 }% H3 i
  95.   IMMDeviceEnumerator = interface(IUnknown)
    ( U/ ^9 w. p7 G% Y
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    4 k5 ~4 K: M% _; q4 V
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;" W4 j, W7 q4 _& F
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;1 w8 Z9 _) p: N
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;; i2 f) O3 \1 c* n! l' _; v6 h, r
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;& m# b' a( R4 k
  101.   end;" k  N- S" i( H# X+ e
  102. 8 y7 e/ i: R1 {) Z; W
  103.   implementation( ]! D3 q2 u: C3 a3 q3 H$ I
  104. end.
    9 H* }( O: @- |: {

  105. % E8 n) `; n% O! P( Y
  106. Thanks & Reagrds,
    ) y7 g. g$ U% T3 E, ]- `7 d
  107. Mukta .../ Q, t- q' i3 C, E( T) N+ H1 Y  W
复制代码
  1. 4 L1 \; t6 L& K1 ]9 l, u1 Y/ E
  2. it's work in Delphi 7- J5 ?& T+ T6 H, B8 t1 o4 Q
  3. //////////////////////////
    ; m& @! i! O) C" I: z
  4. & f# V7 E8 A8 S) c$ V) p0 E
  5. unit MMDevApi;+ S3 @: A1 O, N5 o0 ?
  6. ( {8 `1 ]/ u, S
  7. interface
    ) h3 B* s1 ^* Z/ q4 {# ?8 s
  8. * W3 j) g: h  I8 K4 F
  9. uses
    8 g& P8 [, E+ q# ^3 A& M
  10.   Windows, ActiveX, ComObj;; ]' ?3 y1 Y0 F6 E/ B5 j

  11. 3 [5 \$ H% D) M& h0 p
  12. const9 @2 o/ W7 t) X' N, H/ K* ?
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    7 i2 c# {3 N! t7 `9 g3 o
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';1 N, k/ r* J3 _  D
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    $ D4 J; F0 X8 a( l
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';5 r) o; ^# e+ K, q( p) P& \8 i
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';; M: ?8 i: I; `4 `
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    6 s" Q" q; Y) b) ^& w. h8 z
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';1 X. n3 _2 u7 F% U

  20. 8 Q4 o" ^  D& Q* i1 `/ R
  21.   DEVICE_STATE_ACTIVE                   = $00000001;* q" g3 h* P, ~" }7 O+ }# H  q
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    5 h5 g: g" \* S' C7 v
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    : J% I" s2 D9 S9 d
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    / e9 |' {% l& U* `+ ?0 S7 n

  25. # ^- j+ j, Z4 F, g. i  v- S
  26. type
    ' M. b' F- S: n6 m. k: V$ {
  27.   EDataFlow = TOleEnum;+ q+ \: t  N, G& ~/ ^( ?4 F' [' g

  28. ; J$ ^: a) O& d& c5 F# C
  29. const
    * |* Y1 M' n' S# y- q
  30.   eRender                               = $00000000;
    % M8 K7 H) w% s" E7 o
  31.   eCapture                              = $00000001;
    6 A/ h% M  _4 F2 S% @& E2 D
  32.   eAll                                  = $00000002;* ]7 t! K8 y; `/ b  g8 n: W
  33.   EDataFlow_enum_count                  = $00000003;
    - T9 z6 V/ ~7 b2 J6 m2 Q' @& @+ S& G

  34. . m) @- }+ e8 [" `
  35. type
    7 |: Z% n/ B$ c: T9 v* ?2 J
  36.   ERole = TOleEnum;/ Z# j! [2 Y1 p8 t* Q1 d( s

  37. + ^% `5 W/ C. r$ ~; F' Y" c. n$ ~
  38. const
    2 z" O3 b- f% O( ~
  39.   eConsole                              = $00000000;; ]/ t$ b+ U5 c5 P
  40.   eMultimedia                           = $00000001;$ I! V5 d" d! V
  41.   eCommunications                       = $00000002;1 F/ m* S( v9 r8 ^; Z) x& c
  42.   ERole_enum_count                      = $00000003;
    ' M( G+ P7 {' j) ~, t

  43. 9 g+ j# {$ F0 G2 T4 t8 s
  44. type
    / ?0 |2 L' `4 n) r! m
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    4 g$ x" Y/ Z7 ]* d0 f% G, u
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    $ S/ e0 o" Y7 J4 O; u  H
  47.   end;0 o. U3 b* ~* k0 `$ X' \3 t1 M" z5 X* ]
  48. 0 @% C; l# @& X
  49.   IAudioEndpointVolume = interface(IUnknown)$ M: g4 t) v: f# O
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
      |  e* u2 H% j7 Z' O
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    7 Y* `9 `% o1 A- c/ [( B8 U
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;% \1 r+ l4 D! u- z
  53.     function GetChannelCount(out PInteger): Integer; stdcall;- O6 S* i8 X# h& |$ q% `0 [
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;# F' Z% {, i5 M3 ?: |
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;# W5 y! Q' w- c# A- P: Q* L
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;$ R1 Y' v( u. p' H0 }
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    5 f- s6 f8 |, o
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ' ^* [* a$ C# F
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;3 f. F0 [9 T' J1 ?5 i4 \! g
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    . o9 D# d: T) R+ ~
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;6 n; Z0 r$ D! w, A9 }6 Y5 w8 o- o
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    * s; z$ p, T; _3 A1 }7 B) `
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    ; O1 ?1 g. n9 J' Y9 k
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;% W# X% [2 R* [7 e# p9 d- `
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;2 w: |$ n7 ^) S7 A
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    - u5 W" v7 A/ X# u% n' c
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    9 x' Q0 [( ~' y# w0 I
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;) m) X- |6 ~$ R; Q8 b/ n
  69.   end;
    . A6 Y& `, V8 h! k1 K% s: u
  70. # C) ^& i7 G: V7 A: ~
  71.   IAudioMeterInformation = interface(IUnknown)
    4 E6 h  @2 a$ J1 R$ R$ R, U
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']8 H$ o- f; ]- J8 q( ]- C7 ~
  73.   end;
    7 {7 c" }. g+ Q( B) `

  74. 2 m0 A0 H/ s9 ]" H. a3 ^) z
  75.   IPropertyStore = interface(IUnknown)' H3 D1 ^. M# B1 F; o- F2 k* @- Q
  76.   end;
    4 `$ _/ J2 V& m' M3 p
  77. ) G( G! [, B0 V8 [$ I7 [1 Y( O
  78.   IMMDevice = interface(IUnknown)
    " f' N* a; k5 j' [+ y$ U) t
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    # y( n3 z* y8 `( R5 R
  80.     function Activate(const refId: TGUID;1 D5 H- `, Q+ S0 L
  81.                       dwClsCtx: DWORD;
    ; `; |5 Q3 E1 C( e
  82.                       pActivationParams: PInteger;3 R% d  K1 P- Y9 D
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    1 d2 x" ]9 T" e
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    8 x9 ?5 x( ^( w% q. e
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;0 g: ^3 j9 v. W% t6 M* d
  86.     function GetState(out State: Integer): Hresult; stdcall;3 g9 Z) ~* e8 b( f* U
  87.   end;+ i. f) i4 v, H$ ^0 @

  88. 5 _! X. h, @1 F5 ]2 ~
  89. 2 |% U% P3 t: a1 q9 e0 [' x
  90.   IMMDeviceCollection = interface(IUnknown)2 x, V7 A/ U" e; J6 q
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']9 G4 j, U6 T% h9 ~4 V
  92.   end;
    9 b; }3 Y% l' y2 V& |

  93. . }  T, |" P% I  D
  94.   IMMNotificationClient = interface(IUnknown)
    % i, a! q1 z3 E+ l3 Z/ d' G
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    9 E6 ]: @( K! d! K1 k
  96.   end;, B$ T) N" L5 @
  97. 4 i" u) W  q' O4 {# O# T
  98.   IMMDeviceEnumerator = interface(IUnknown)8 ^. c; E5 Y! m5 G; L$ Z1 A1 [
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']) W) C7 H3 U$ [
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;3 a+ r) [. T! y. l: w# @
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    * S3 h6 V) Q- Z5 A8 a% _' ~- c$ c
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    " A) D6 i; `% T& I% z, t$ g: c
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    6 O0 c! I2 Y1 C  r) U, F, V6 C9 z; ~
  104.   end;
    ' l; d% r0 k8 _- V, A
  105. - L# w6 W; t5 v( D; i, N, K" a
  106. implementation
    2 i7 d; [! d* Q3 p
  107. " ^9 T  Q3 z9 @4 p- W
  108. end.2 e2 F' u1 B1 `& W7 L
  109. ' Z. H* h! A( ~: R8 j* R
  110. ///////////////////////* w) B* R. D( \0 z$ t6 O
  111. simple sample :)
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  112. ///////////////////////
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  113. 8 ?2 k& A2 O7 B+ ?0 `2 m: a$ E4 ?. H1 L
  114. //...... other code2 o  b7 O: F* }% w+ k* q

  115. * w' |, \6 r) \+ O( c/ I3 c* ]" k
  116. uses ... ActiveX, MMDevApi, ...;) |/ W( o( T* d' A$ d7 k: I2 ]4 D
  117. 8 E$ w6 n4 o  K4 V4 t3 v- x
  118. //...... other code
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  119. 8 i. `* e8 Z" Q. W; O7 t7 ~3 L% n1 N
  120. var& u5 ?+ K: ^3 n0 {
  121.   endpointVolume: IAudioEndpointVolume = nil;; r, d* t9 d+ M  s
  122. ' D9 x8 \& m* ?$ k* y' h
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var
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  125.   deviceEnumerator: IMMDeviceEnumerator;
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  126.   defaultDevice: IMMDevice;
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  127. begin
      ?5 [- n$ p  c( o8 Q. t! k
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);7 X  ^( U! w6 H3 Y8 R( m$ j$ t+ r
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
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  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);, t" m- f& O+ O: ^& _7 m
  131. end;
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  132. , h8 z" A2 ]9 D
  133. procedure TForm1.Button1Click(Sender: TObject);3 q* Q$ |4 [# E5 h- Z9 u: q/ K8 m
  134. var
    5 F  O3 T& B  h* u  @
  135.   VolumeLevel: Single;9 D0 m" P0 W5 c# z; [
  136. begin
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  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;- {6 N( K2 v5 ^% z2 W9 A& v! a
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);7 d- L' ]' I9 d$ ]
  140.   Caption := Format('%1.8f', [VolumeLevel])0 B1 E) Y' q+ @) X- K
  141. end;
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  142. 9 |2 t/ w7 L; R+ N. J
  143. /////////////////////////////////////( d. m5 Z& Y" n" G6 ]5 {
  144. 7 }6 b) o3 N+ m4 T2 _! M0 [
  145. // with best regards ToxicDream! G; A) k: \- P! {8 W
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