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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/ Z6 Q* s) N5 z6 D7 O- ]
By Mukta & ToxicDream

  1. : v. v/ O$ q/ |5 w' ?' D# A
  2. //for delphi 5# r3 q1 t" v8 `( \6 _
  3. unit MMDevApi_tlb;. f: o! d! N* X+ r5 O% S  x

  4. 4 y8 _( \4 B4 \& ^8 t
  5. interface
    7 Q6 y3 z" U* K/ T
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    ! q6 S/ \' g& x6 m
  7. const' A, Q6 a$ v6 r; n: e
  8.   // TypeLibrary Major and minor versions" O& M) D) a) _" t# }
  9. - f0 h: I4 M3 M( O( i0 ?/ H
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';$ C. X0 C. [& i9 [* j  Y
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';( ^. d5 w3 ?; M* {5 r
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
      G2 F! a8 |2 L( L. P' ?8 w
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
      z( Z" k& |1 b0 B+ S/ [  V
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';9 y' T" ^! I: I- D" z: D
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    / [6 p. m" K* K0 m
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    * `+ b2 k1 x9 I7 q6 q1 S# n

  17. ( v- V! s: S$ Y( ~$ T8 b
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    - o  ~% F: z# S( d( w7 u
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    " P7 J; B" T& U: C  J' D4 u0 _
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;- N% R/ W5 b: P& m. N
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    0 |" @) J# m9 c/ o$ _6 z# E; C: P; b5 G
  22. ) n# k. ^, |* B7 G. [+ M
  23. type
    % A# c; P' O) @2 C2 g2 f- T: C! o* ~
  24.   EDataFlow = TOleEnum;
    2 n) N4 G) O0 {# }+ X% Z* U
  25. const* w9 V# r5 f9 E' J' }; P$ p; K
  26.   eRender                               = $00000000;
    4 ^1 ?; u& w! I; B5 g
  27.   eCapture                              = $00000001;
    $ f/ F  B; a% R, T) ]% [' Z
  28.   eAll                                  = $00000002;
    9 ~  j' L9 F, I( h0 c' p9 a
  29.   EDataFlow_enum_count                  = $00000003;
    - o# ^. a! X8 t

  30. 6 o7 L7 G) }4 ^( }8 a
  31. type( X" M0 ~8 s" W7 ~; O" Y
  32.   ERole = TOleEnum;- k6 K1 t  a( l
  33. const
    6 T0 Y, H% Z+ s* N. w0 ]; I
  34.   eConsole                              = $00000000;/ h6 k5 m6 m  v3 N; L8 a6 b
  35.   eMultimedia                           = $00000001;
    9 O/ n% a* p! B0 O* q
  36.   eCommunications                       = $00000002;1 t. C0 P# y. W* [$ `; i
  37.   ERole_enum_count                      = $00000003;
    1 D% d# x' Q7 Q% ]

  38. 0 `* P# D- F# E. Y2 d; K
  39. type# \& @/ ~# B9 f  m
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    . h. _4 M4 J+ b2 x( z. [
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    : A7 r# i, q4 v# |0 O$ t
  42.   end;) W( M; T- Z8 C$ E/ \5 U) r. o

  43. ( ^3 ?0 V1 E! `( Z2 [7 A
  44.   IMMAudioEndpointVolume = interface(IUnknown)
      c# R. v8 J2 P& E6 t
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    ( Y$ m" w/ z$ ?& p1 h
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;9 E: _8 T! `  n: V- L: C
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
      I' F4 F, k; ]6 `' N8 ?# F; M
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;/ ?( K3 G1 ?& }* |
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    : P. E) |2 K$ B+ s. z1 F
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;5 C& L, j3 _  i' e# q- J, b9 c9 h( l
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    3 q) B2 ~% A& x4 t' z& K/ |# S4 o  ^
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;2 u" l) ]3 Y8 a$ m1 g/ ?. g7 o
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;) w6 ^  t# Q) U! H! t" Q; ^
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;; E. {0 ]  K  m3 r, K6 r, y4 u
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;/ S7 z7 y" U1 J9 t( P
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;3 M* Q5 G1 l) p/ k
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;0 R; {; J1 J$ I# [. n* ^
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;: ^- X! d- }* q$ y( f7 Q  C" @7 z) t  n+ b
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;+ F8 U7 @$ o; r3 q( A
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;+ o3 r! m! `4 u6 q2 A
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;" V$ s$ Q* O# A, f% }* R% g
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;( v  k2 U  w; L; [& F+ N% ~
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;0 q1 ]5 S8 v+ G, `: T* e" i4 X+ N& l+ r  Z! L
  64.   end;
    + ?5 [% |( t+ a) a/ U1 X: u" [/ e
  65. " f8 J# I, T# D# o
  66. {  IAudioMeterInformation = interface(IUnknown)3 }) V( m  ]$ W
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']' ~7 K& o8 ^- x
  68.   end;}
    1 U& m6 a$ I4 O. {) c6 h$ m
  69. 5 R: J; r6 P$ Q3 ?( y* R
  70.   IPropertyStore = interface(IUnknown)$ `' C0 J; c+ J, s+ l
  71.   end;! \1 @6 ^; V0 U! `. f% b: A+ w
  72. 5 |; o/ ?% l+ O1 u+ q+ d  d; G. w
  73. type5 n7 m2 \" _) _( K( l
  74.   IMMDevice = interface(IUnknown)! R  `$ E5 R# z3 t% u; T* i$ C4 }
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']) W2 O. J7 D4 V- \9 ~* e
  76.     Function Activate(  refId :TGUID;9 R5 y1 \" F0 Q1 T3 w4 B# x) B( p
  77.                         dwClsCtx: DWORD;7 [' n  H9 p  E' |. H- p( r
  78.                         pActivationParams: PInteger ;
    $ e" k8 q( o, C' H3 V0 `
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    $ N( B0 X' F8 P- [6 _# o9 J' S
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    ' E6 n2 M5 u6 c* l
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    % O) I: `& G* g" |$ N
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    ) k+ }4 }- e4 k7 B3 [

  83. 8 S6 \9 W) s# t: y4 J7 T  j) o9 p
  84.   end;+ b1 s# @7 s" q$ u8 }; {) D! K6 I

  85. / m% x* t, S8 a& Y/ z

  86. * h; r. x" |2 M3 I( K
  87.   IMMDeviceCollection = interface(IUnknown)
      }# d7 c5 V+ o  O0 c5 a  O* g( m
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']* x# A' B$ x: `" p, n2 T  l
  89.   end;6 B5 E' v/ }1 h! V+ x( [$ l# j' l
  90. 1 j  b3 R1 D& F5 Z, r
  91.   IMMNotificationClient = interface (IUnknown)! P  O4 U2 f( T" F
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    % i" g8 G: C- A. \+ P
  93.   end;6 T; R: t; \$ ]. |8 l  ^
  94. . d, U% m& Z7 u; L! U) t
  95.   IMMDeviceEnumerator = interface(IUnknown): o# g1 ^& p* ]1 i9 ]; D8 O2 P! U
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    / `$ k: R) l6 L7 Y) j
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;8 J8 R. ]/ ]7 u2 c( K
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    + q  Q# h; Y. B7 o0 e( N" \2 W
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
      ^; Q# T" v# O7 I# B) k! f7 }- F
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;6 m1 ]! O8 s7 Z2 B" z0 i# x
  101.   end;% c! ]: j9 K7 d9 l. Z. d2 Q* u3 M) v" j
  102. ; A" u% _$ \! _; J0 t; E* S+ d6 J
  103.   implementation
    6 J; e. l! `6 q
  104. end.$ c# n! U. u5 D, Z( J

  105. . R2 ?, ~" `( R) n+ y( O; Q/ x
  106. Thanks & Reagrds,; N3 l2 l' V7 \3 U& T: {# D
  107. Mukta ...: _( y0 |/ S, @8 {3 @! ?
复制代码
  1. & \6 |. F3 a( ?9 b' G
  2. it's work in Delphi 78 U. W  s0 g  s+ x% ?- g
  3. //////////////////////////! i6 d0 F+ J2 O5 B- g3 ^, T

  4. " j  a* j2 j# L' b# E5 l
  5. unit MMDevApi;
    ) d+ a1 b* u0 B
  6. 3 A. d% S, ^1 g1 d( z1 \
  7. interface
    1 F3 `' ?, a5 f  K, m) j* A# D

  8. ' R2 N% ^0 s/ V1 o
  9. uses
    % J3 e5 w( P) u8 c, @  L/ q  G
  10.   Windows, ActiveX, ComObj;
    . I9 y9 k! X) W& G5 y* Z: ?
  11. # B" }7 c& d- k# @7 g
  12. const
    3 G+ w- m. H1 F: l% _
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    4 s# `: \. Q- [' [) M
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';6 Z/ c; _9 O! x% c: k
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';( C. E& P  S5 x* s3 P* h* Z1 k$ o
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';) ]* S' F- v& W% L2 J9 C  l
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    & ?* @( F5 O. o, q2 Q
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    8 O( @3 r# D, a* Z7 t& y. y
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';0 ?$ _4 f/ A# W- P

  20. & l3 t6 r/ z' Y6 ?9 d2 T9 d
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    " k, k% f; W5 C/ l/ N1 _  `3 `( `+ i
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;/ \  A% L% v8 x  l" k
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    1 Z# J( t/ y( B  @
  24.   DEVICE_STATEMASK_ALL                  = $00000007;5 y* m; Y# t1 u/ C8 g% z" F4 |  \- C' P
  25. 4 ~6 W8 A) c; Z0 h# h
  26. type
    ) U4 \/ @: w# _5 }7 C' x/ P
  27.   EDataFlow = TOleEnum;# {- G8 S2 N5 W  h# O. K7 C: ]+ P

  28. 7 t) ]: `8 R& ]% p0 K
  29. const
    - B: }3 X" h  D
  30.   eRender                               = $00000000;
    & D+ Y1 h1 D. m9 X; G
  31.   eCapture                              = $00000001;3 [1 p5 W6 ^( F- j$ F
  32.   eAll                                  = $00000002;
    $ j" J& X% B* q' a, [+ N
  33.   EDataFlow_enum_count                  = $00000003;' o: _) @3 N& r/ j; s; c8 k- r

  34. ! ]! T  k( Y# F& s) b
  35. type
    + e/ r( o, |% q& \9 t" `3 S9 \
  36.   ERole = TOleEnum;
    , v* t( l2 C3 I) u! q- R; b
  37. 0 ^+ E' [- r7 d& v& h9 H
  38. const) u0 x9 h$ z5 i( o
  39.   eConsole                              = $00000000;
    * w1 j+ P9 v  r1 Y" k) W. j, K0 c
  40.   eMultimedia                           = $00000001;
    + J8 }6 T6 |) c* x" D
  41.   eCommunications                       = $00000002;& Y+ t/ ]( f% T! v6 v9 F! S1 x1 R
  42.   ERole_enum_count                      = $00000003;, Q. e% N4 I- a; P# d% w/ j( }

  43. : Y. h6 w6 f* R- ?, d) m/ M
  44. type9 |# J- `4 _6 O$ @
  45.   IAudioEndpointVolumeCallback = interface(IUnknown); z/ e9 f$ d7 z* U# c) Q
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    : e* o+ g+ W- T
  47.   end;0 y8 ^" p# d# ?$ _7 H' W

  48. # m, N2 Y# x) H3 h8 \# I8 l  m
  49.   IAudioEndpointVolume = interface(IUnknown)
    6 L; ?  N) @4 b& x7 i
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']: X& S6 N" N" J5 |2 ]1 ]* b. [9 U$ S
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
      W' C) M. x2 _7 G% ]4 V
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;1 b7 ?2 r% p9 y6 ^- S
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    8 R" L1 \1 d" O" t1 ^3 j. Q
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    ' J) ?4 u, f- f4 C
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;) R( P7 A4 A7 z5 ?" m
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;: v/ L/ S. h$ ]" F/ S3 P7 n
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;% W* P$ z" X/ P8 a
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;6 h: |1 X3 [6 |  u+ r% ~
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;$ V7 _' [& ]4 a. ^8 k
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    4 o; L' H- Z9 |8 b
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;8 \, U" k6 \! V# F) U- e6 P
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    ! o) X7 O$ q3 \1 K, k/ M
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    ! O. p1 X. Z+ H2 o; E* G
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    * m) ]) i$ e0 Q) w) v0 k  b
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;! a* b) }" e7 Y4 A, ?4 }
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;6 U4 }- g3 m. _$ [
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    ( F  w8 u, W% O1 I4 v7 _3 v$ P
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    , ~; f& w) E; i% G. w
  69.   end;
    ' Q# X/ s4 t) [' L* A, M, O
  70.   e0 A8 d5 q1 E3 o/ W
  71.   IAudioMeterInformation = interface(IUnknown)
    / J& v% L5 P' u  E
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']3 y6 c6 F: V* ~0 H8 `% Q, O/ ~
  73.   end;
    * ]: i* K( I. m7 f
  74. , @7 y4 ~4 `- r6 W
  75.   IPropertyStore = interface(IUnknown)) }( @; F! _  |2 u- Z) ?
  76.   end;3 A: T1 `( l  j* i6 _1 z

  77.   G1 @% J: t& ~( n
  78.   IMMDevice = interface(IUnknown)- a: O" F5 ?9 b
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    # a* m6 a, x: e- O. o+ v
  80.     function Activate(const refId: TGUID;0 K% M4 D  o* f0 T
  81.                       dwClsCtx: DWORD;
    + X% _5 b/ R" i
  82.                       pActivationParams: PInteger;
    , |; z) B& W1 [3 b+ h0 H5 [  b6 e
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;4 z7 h$ g4 R4 M3 P8 q% Q/ B/ x
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;0 v9 K. Z: Y: l" l2 B+ m0 H  w9 Z
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
      v& c" H' [! f
  86.     function GetState(out State: Integer): Hresult; stdcall;
    # O& N9 G( J& R4 Y
  87.   end;+ q+ j* O! h1 ~: E) x
  88. 8 z5 d/ }* p% ^8 j; @) f9 E# M' `

  89. ( L' r# l* }. N7 ^
  90.   IMMDeviceCollection = interface(IUnknown)' L5 b2 m$ }0 ]8 e
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    # T" E5 P7 @- K$ F* ^6 ^
  92.   end;& o6 r6 S& m- h; G
  93. 8 T  c! B$ q9 M! D; a. a
  94.   IMMNotificationClient = interface(IUnknown)1 t; o! _7 b$ w4 R) s
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']  `8 i) e+ Y) u5 r. J
  96.   end;
    ; r: z4 k7 }! U* I" U; [2 W

  97. 0 j- N0 i: \, q# ]' f! _
  98.   IMMDeviceEnumerator = interface(IUnknown)8 L8 c8 G% k1 ~
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']. ~0 I# u5 T  k  [  w; g
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;' e3 f4 C0 W* L2 s: Q$ o
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;* I3 H! ?% v3 |, p
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;+ {! C* }0 Z7 U6 M/ M' n% j
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;9 P1 k  u5 Y! B$ y4 o. H
  104.   end;
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  105. 9 k/ K0 f$ R# x0 s4 @, D
  106. implementation
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  107. ; W) [5 a" N0 E( N5 t+ F
  108. end.0 H" }( L% k8 H$ H5 {. W$ _

  109. + n8 H- w" r7 D9 |) g& w* m, p" {' _
  110. ///////////////////////1 m0 _# q5 [2 C. h, q% X/ G
  111. simple sample :)
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  112. ///////////////////////
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  113. - v- W3 A" @' Y9 L- C7 e6 i# B( E
  114. //...... other code
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  115. , w: w+ f1 P/ D- E  [
  116. uses ... ActiveX, MMDevApi, ...;
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  117. ; y( M5 |+ p" ^/ Z3 u/ B* X
  118. //...... other code: f5 b& v0 |6 R. W
  119. / ]8 d: Z- y6 Y; }; u. w7 \
  120. var, \+ o: p# d: A- d1 V8 ^1 ]( K
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. % ~' A9 ^2 r/ o9 m( T, u2 Y# X
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var
    5 s6 ~  }. ?- T2 I- \  u  ]
  125.   deviceEnumerator: IMMDeviceEnumerator;
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  126.   defaultDevice: IMMDevice;/ L! H( I5 R3 D, S5 r
  127. begin4 c- {, `4 m$ D, z8 n1 Y, O
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);+ J. {" F9 q; R) C5 z
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
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  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
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  131. end;
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  132. : q- m$ }$ b# `+ Q
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var1 l4 e4 d" b. D
  135.   VolumeLevel: Single;) H1 |" I) x( l  W; e/ B" e
  136. begin
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  137.   if endpointVolume = nil then Exit;, a1 p; K, S( u( B5 `
  138.   VolumeLevel := 0.50;4 H2 ~5 t% ]; f- Q
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);5 Y& c! a) |3 I
  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;' {- H, u4 F& q) h
  142. 2 B/ b# l2 b4 F! i
  143. /////////////////////////////////////5 D2 X. u  i& A+ [# F% f1 ?( U
  144. : q6 ^1 {: ?& c1 v8 H# K0 H
  145. // with best regards ToxicDream
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