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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, v2 U" G2 E+ z+ L& U' M
By Mukta & ToxicDream
  1. ) P# A7 `0 d2 T) @3 d2 ?/ x. Q
  2. //for delphi 5
    . Q. M5 s- s$ I
  3. unit MMDevApi_tlb;
    / I- P! C+ j" a( K) g) \, H( t

  4. 1 q, s! |% m5 L% r: D9 f
  5. interface
    : [# C' ?1 j& d4 d7 ~
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;. d0 _* c9 Z/ L0 C* a, E. K: i
  7. const
    1 Q, A8 e0 B/ W. _) Y4 S8 Y
  8.   // TypeLibrary Major and minor versions' R$ t! m7 i( P5 ~
  9. ' q9 D: g7 P! W: _
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    ) r0 l1 u  }' _0 X: e( n
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';; I  X% e0 K0 j- D  m, E
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    4 Q3 G8 w* j8 v' g, y7 y
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';3 p/ U8 K( `. p- w
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';2 E- H- v  D9 C( ~0 K- K4 ~4 @
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    3 e. T1 F' z. i+ ]4 z: Z' M  C
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    . t2 k' J3 l9 U( |- b
  17. 9 {5 x. h+ H2 J" W% g7 v
  18.   DEVICE_STATE_ACTIVE                   = $00000001;8 w* E# I1 n3 Z
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    ' h% \5 M/ p! B3 B; G: I7 x8 f7 R
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ! M; f9 l* [" a4 R
  21.   DEVICE_STATEMASK_ALL                  = $00000007;/ t: k7 s$ G. N

  22. 2 D& }8 u7 G8 T( F
  23. type
    0 S# j3 L( D1 y6 e/ k
  24.   EDataFlow = TOleEnum;& Q7 y% y. D2 q/ y# d
  25. const. r, g. l$ Y7 H' H5 Y9 ^
  26.   eRender                               = $00000000;1 G6 w) [# @1 u$ H3 k
  27.   eCapture                              = $00000001;% N; `. t3 E' U- S  x
  28.   eAll                                  = $00000002;) j8 X9 s9 u0 O5 Q
  29.   EDataFlow_enum_count                  = $00000003;& E2 G7 b  w+ r0 [( f! [1 h: z

  30. ! h2 C$ @* v, Y6 x: L9 J; U$ u
  31. type$ \. ~7 b' O2 P1 v* a, H& ^1 \5 d, P
  32.   ERole = TOleEnum;8 p2 Z6 n8 k9 j# V- z
  33. const' [3 k: y+ u) p0 E/ z7 v
  34.   eConsole                              = $00000000;
    : f1 o' L6 f" |% y) }
  35.   eMultimedia                           = $00000001;$ g" Y, N7 k/ c4 n6 H) h
  36.   eCommunications                       = $00000002;
    & u1 e& B) k, @
  37.   ERole_enum_count                      = $00000003;' J& y% o) P/ h) c! e9 M# [; ^
  38. ' t4 _( f. C5 T% i, w8 I
  39. type
      w6 J: r4 M6 s2 C9 e+ X
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    : w# p4 C0 v/ U( K/ G
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    $ k0 H3 [! o4 p+ P- A( Z
  42.   end;
    ( w" K5 r& g2 Q( \0 x) b" R! Q' j

  43. 7 `! G( O+ D4 z$ T" {5 O
  44.   IMMAudioEndpointVolume = interface(IUnknown)' r8 N9 u5 D: e$ E1 |" M' `. ]
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    * A$ v+ b, u, ~( P8 P+ q' B4 d' {- }
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;0 E7 }  j( f; D8 |: T
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;" y) M$ O  p6 l0 G+ R/ b
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    7 A& F# n- B" M9 c
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;7 E- K! s$ P& Z4 Y
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;+ k1 K3 O4 i. u* q
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    : F1 S( P# M! |6 O. A9 [. R
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    8 @+ k( Y0 u* y$ O
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    . H- |6 N! P. ^% ]' e
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;5 D: t+ k: Z' n0 f7 n, T0 |' {# s2 T/ s
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;# w) t- x/ @8 _
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;6 x6 f# ~: F* U. }+ d# N# R$ d
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;, {8 V8 ~- m7 h2 E" J$ R7 Q1 C# Y
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;: n6 ~  _( C9 T. K& C+ k( _6 ~
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
      X- ~2 {* k: K. `; d
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;( X8 @1 W7 h, V6 g
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;% A- J  H" n: q1 w
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;# R- `/ U  h* K7 G5 _0 C% Z1 x( ^1 {
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;/ |" n8 m9 [! [' o- g/ @
  64.   end;
    0 H. }2 C/ j- e
  65. ; A4 _3 j: J! c0 q6 I3 {+ G# |
  66. {  IAudioMeterInformation = interface(IUnknown)
    - F" `- R9 J- H6 [
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    ) C- X" w% d( R
  68.   end;}2 W5 y; ~& C: u, a0 `2 U

  69. ! i& U) _' @8 W
  70.   IPropertyStore = interface(IUnknown)5 M' I4 ^5 k  c, Q
  71.   end;
    & X$ W" `3 Q5 Q2 j

  72. ) w( a5 s8 ?/ U( c0 F- Q
  73. type
    3 \  m% w, B9 H( ]  Y# g/ s: S
  74.   IMMDevice = interface(IUnknown)
    % M& D' w8 T% D6 N, ^
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']# `6 J( j5 ~3 x6 V8 K; P/ I
  76.     Function Activate(  refId :TGUID;
    : \  o& P1 H/ p+ c& {! v; T) p
  77.                         dwClsCtx: DWORD;, ^- I) d( n0 z3 O* K' _/ _
  78.                         pActivationParams: PInteger ;+ y2 m( g4 B& P
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;% S+ Q2 x! k9 A1 l
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;+ H* @4 U# X0 b3 _2 }* a- _
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;, f8 J" a1 o, ~" c. j* j
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    7 R; v4 K) Z( t3 n" P8 {
  83.   i  a0 ?# C, u' N3 t
  84.   end;, j4 x# k8 G& c: ]+ R: p+ n: N

  85. . L, p7 h6 O9 `$ d2 ?% R, v! z2 G

  86. " i/ j0 R# P" w, _' ^
  87.   IMMDeviceCollection = interface(IUnknown)% G% J5 X% s8 D, E
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    9 W2 e3 k7 F4 V+ j
  89.   end;
    0 K1 y: m+ h, F5 l$ K4 l
  90. . k) N/ s( x0 E' ?6 ?$ J4 }
  91.   IMMNotificationClient = interface (IUnknown)
    % i" N! O+ t0 _2 s- w% y& p
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    ; o$ {9 p/ N6 F2 C+ _6 Y, O! q
  93.   end;1 B: J* _4 I. a

  94. ' i8 \5 A) }7 ^4 G; }2 K2 f
  95.   IMMDeviceEnumerator = interface(IUnknown)
    / `+ R+ Y/ `0 I  R
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    # v2 Q4 T+ W' Q, y. v4 L2 J
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    0 M" @& T& g( I6 V. Y2 W9 @# g
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;0 [( W7 Y" B8 b- r  d8 g& \
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;, o; i) ^9 m4 O& X, ?% A. S* h
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    1 e. x5 _. E, F( @
  101.   end;
    . S8 R! m& V  c# s0 ^6 h
  102. # e, V* K: \# K. o) A
  103.   implementation
    : m) V& ?+ o; Y9 [7 H# c
  104. end.
    / Z, b& a% p* t
  105. ; z2 e: x2 K8 z6 f- _7 @
  106. Thanks & Reagrds,
    % D9 o& u' g9 P0 Y
  107. Mukta ...
    $ R, @, E3 @+ O# I
复制代码

  1. + ~1 b9 S) \: q+ G  s$ d( b
  2. it's work in Delphi 7* p: y; M3 v2 o2 `& d
  3. //////////////////////////
      _0 U& u' m4 i3 d1 O( m  C- w

  4. # E  A; q- @# t6 t6 p
  5. unit MMDevApi;( `2 K# a: O" S# {5 l( M4 ]
  6. & m- F* C4 _- V- J  k
  7. interface/ u: ?" z1 M$ O5 v0 S+ B8 f
  8.   m4 [& B/ c1 R1 A% Q
  9. uses/ ]+ w) ~) s4 T: ~, g/ ?# u
  10.   Windows, ActiveX, ComObj;- d. Q& _$ C  y. m0 f4 |( {

  11. ) N1 x* V: s3 d* ^
  12. const
    . i  b' s4 |# X2 }
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';+ Z; C, _# E0 f" t7 v" S  x
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    9 Y* B, |3 q: Z( y
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    * S% k, B; o( Q, E
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    . t/ v8 t$ U7 h
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';2 m- @7 Z8 q+ }) q& g" v% x
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';: L! @+ r3 R9 W7 J6 f( L
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';5 A: N( @5 V  ?5 S
  20. 4 J7 @' x* o1 f0 i2 L9 c
  21.   DEVICE_STATE_ACTIVE                   = $00000001;6 j. R7 @+ @, f. [) O
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    1 a. E) T3 |! {( f1 j( R9 P+ Q
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;" w& R4 c0 q2 s: G9 f; t
  24.   DEVICE_STATEMASK_ALL                  = $00000007;/ o/ E9 }3 m- Z/ h) x" ?
  25. 6 F6 c! n( D% w
  26. type
    7 \- L6 J" n8 [  F
  27.   EDataFlow = TOleEnum;/ Z2 k& O' J  j% ?7 n0 }
  28. 1 _! T* p# W5 N4 P! `) j
  29. const
    ' G! R' {4 h; X/ ~6 P0 l' q) w
  30.   eRender                               = $00000000;
    . T+ I/ W' r* C2 S( O: [
  31.   eCapture                              = $00000001;- p7 U4 ?' M. Y& [/ H
  32.   eAll                                  = $00000002;. C$ c( J/ p8 v6 [( b6 k( l
  33.   EDataFlow_enum_count                  = $00000003;. P1 {7 `. \) \) V' L% G8 d

  34. : W5 V5 a: Y7 U0 A1 N9 Z8 @! y* o
  35. type8 q& G: B, z* G- L; V' L) J
  36.   ERole = TOleEnum;$ l7 s) r1 x8 q$ S' S+ q. S0 o; M

  37. 9 r7 N. H3 r, F& i+ X
  38. const* d" C6 M  x9 J
  39.   eConsole                              = $00000000;. w" J6 |+ @6 s* T% H+ r% Y
  40.   eMultimedia                           = $00000001;
    & M' _3 A" Q; K1 i2 k. |
  41.   eCommunications                       = $00000002;$ q8 |) F9 n( O1 I& [, I" A2 a0 t
  42.   ERole_enum_count                      = $00000003;
    / i+ C8 Y& B9 D% v9 P

  43. ! N( a+ q* x5 [7 o$ \( T
  44. type
    9 |. b: M3 D6 l5 G# P$ X2 u; e( H2 k
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    ' }8 ?- ?. l. D
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']$ j' J) f) W, v: s- m3 b
  47.   end;
    9 F/ b; l) e6 b# ]/ m

  48. " M1 m8 n6 B: x1 C8 H) E2 J% `$ X
  49.   IAudioEndpointVolume = interface(IUnknown)1 m# t- u2 M3 r% n, c
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
      G, J- k8 C* m  X! h
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    6 |. q; \/ G- ~$ @& _4 }0 z: N
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    : `' X. U) M8 }
  53.     function GetChannelCount(out PInteger): Integer; stdcall;  }3 S, `, V$ G6 Q3 b
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;& Y6 s  l( i4 M0 R' p+ |
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    0 }* R/ O: O' q
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    : O8 n% G) o7 h" \3 V# A
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    ' T- C, O& i! x+ \8 {% t5 s0 j
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;! p  P0 r) X7 L! V: w3 `. f0 L
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    8 d6 F: z% P8 R3 l/ Y% [( R; s5 z
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;8 Z7 Y) c8 p3 _* U8 \
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;2 c# o7 J9 C* f0 m/ K
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;5 r9 Z; w1 }  g8 P2 Q9 y
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    0 e: K: r$ @4 a2 M7 H
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;0 K; l) n3 q, Z- @& `0 N# R
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;. ^5 `7 b7 W! s' j
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;, N) Y& [0 p8 c. s
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;. N# ?8 I% b, U: V; {
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    0 a! r, i1 G% P
  69.   end;- o8 G1 G( T' O: Q. X* R& V$ D+ r. h
  70. / a1 B+ k$ ?: Q' u% F5 S  W
  71.   IAudioMeterInformation = interface(IUnknown)
    & S7 L" R, ~$ ^: y
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    , S' q& A$ K6 |: J- K3 G, `5 ]
  73.   end;$ e7 x0 r9 g+ b& `. W  W
  74. - v; O! U9 [  A5 y. v2 [. i
  75.   IPropertyStore = interface(IUnknown)
    # v3 b( S, j/ e* j
  76.   end;. M; E; P; S7 ]# [/ V5 \  c

  77.   O% t% l6 g+ t' F; f( Q, i
  78.   IMMDevice = interface(IUnknown)) ?' z- U+ v4 N+ ?& T2 j" P4 K
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    & S& G. q5 V, a2 v* P
  80.     function Activate(const refId: TGUID;' M6 Y- x- C1 C$ @! @  a0 M* p
  81.                       dwClsCtx: DWORD;
    + z. o, T) ]% }8 y
  82.                       pActivationParams: PInteger;
    ) r+ U9 p# Q+ k7 m
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    " |' M5 P5 F8 B6 v( W( m
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;" [! m" A/ L  d
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    ' i6 M  v. T2 N& C# a* \5 o
  86.     function GetState(out State: Integer): Hresult; stdcall;; V% j3 ]8 n( I9 X
  87.   end;6 I+ |: f+ j5 d  [7 e& I  H

  88. 3 d6 ]! T. N' k3 C& y4 z
  89. 0 _+ y3 q' |. w. \6 k% P
  90.   IMMDeviceCollection = interface(IUnknown). Z2 o  C$ W6 {9 Y9 q
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    6 k2 d6 J2 \8 }! ]7 Y
  92.   end;+ R: u7 }$ Q& b

  93. " N' Q9 n3 |) ^( u
  94.   IMMNotificationClient = interface(IUnknown)
    / P+ d' s( a& P& G/ n4 n
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    & L5 N2 e- I8 v8 L. U8 R
  96.   end;) x" t; r0 B, e; c% x1 X: z

  97. , I# [) z* u' ?  ]! V
  98.   IMMDeviceEnumerator = interface(IUnknown)0 ^: ^4 X7 U8 x2 \8 N! v
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']3 [  Z' e! r2 ?
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    ) }5 p, \$ `: y, Z* D4 u# ]5 v! a  o
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    ' l  o# E2 w6 U- I
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    7 R: A$ ~5 K. X0 R& ?" o) |9 _
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;" p/ e4 z' [0 v8 A( J. @* Y
  104.   end;- u- O) z! V& r4 j
  105.   q2 F2 k$ t7 {& Y
  106. implementation7 n, |2 N* ]' Z0 U& H2 l! r% E0 N

  107. % i& @- D3 D+ Z
  108. end.
      r; a% ~: z( q& A2 p2 e; k/ V; Q
  109. / h' o% q- u' c" {! Y9 q
  110. ///////////////////////; @1 x$ m0 E0 w2 Y0 t6 S7 G  i# u
  111. simple sample :)
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  112. ///////////////////////
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  113. 6 H  b1 ?. a8 Y: V$ B* u4 a: R- }
  114. //...... other code& I, a$ b: A! H7 Y1 ^+ f

  115. * r5 G$ }0 i# X0 x# `1 u  L" b+ E
  116. uses ... ActiveX, MMDevApi, ...;
    4 [; j7 v( t: x% j; ]* d' L* Z

  117. ) ~- ]- ~( ?% z% V- D" Z/ D4 e4 E# g- T
  118. //...... other code: T8 ]' m2 U5 E" t5 w7 |
  119. + X* s! c6 ]0 S2 Y( Q6 t2 s8 h. d" A
  120. var
    # c% a* c: D6 z1 {7 _. v8 C! o
  121.   endpointVolume: IAudioEndpointVolume = nil;
    0 g! {! Q3 S& E$ I

  122. 2 f4 B) w1 l4 a
  123. procedure TForm1.FormCreate(Sender: TObject);
    : a# j1 {9 q! C" `
  124. var0 q! \$ v+ Y' {; y9 H4 D
  125.   deviceEnumerator: IMMDeviceEnumerator;& M1 j+ X) ^+ S* {" n/ t" P* I4 _
  126.   defaultDevice: IMMDevice;1 c3 r: l) h6 s% H
  127. begin9 d% F6 K- b+ C  v$ [# \0 w
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);) Y: A: P5 Q+ u7 U* [
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);* g# x6 U& \& z( l+ z5 u
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
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  131. end;1 d. @3 o! q0 V! Y

  132. 9 N: `; Q) }( f! r  X0 r4 S* s, Z( l9 S
  133. procedure TForm1.Button1Click(Sender: TObject);# T  y0 ]$ e. ^7 T
  134. var
    $ P. e+ z8 g- R
  135.   VolumeLevel: Single;8 }$ d, ^  [4 m% o9 K3 w
  136. begin" @% A# D0 i, ]/ E
  137.   if endpointVolume = nil then Exit;7 o8 R6 D/ R- x
  138.   VolumeLevel := 0.50;1 O  }5 k2 f2 e$ n) r
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    4 O! ^0 g5 N# W2 t1 \
  140.   Caption := Format('%1.8f', [VolumeLevel])% @& F8 v! e' z' e. p8 s& V- k
  141. end;
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  142. & u) K  ]- K; X2 i- \6 X% L
  143. /////////////////////////////////////: e' E: `" @- C9 q) |3 ?4 F% r9 g& Z
  144. : r- ^( ]/ r4 d  c
  145. // with best regards ToxicDream- E& ?9 M' g; q9 V2 B: ]
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