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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
, w* }- A' D2 MBy Mukta & ToxicDream
  1. 7 L" c9 R' a2 n% g3 e1 m" [/ h& ~  J
  2. //for delphi 51 H# E# i7 q$ ]! {
  3. unit MMDevApi_tlb;
    " i# {/ j. Z1 j* I
  4. 6 x7 s+ u+ e& f; v) \2 `
  5. interface
    ' R# a! \4 r/ v7 {9 d
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    1 |3 r# }( R" f1 U! u
  7. const
    $ @# F' H# T% ?( i
  8.   // TypeLibrary Major and minor versions- |: I" s* C8 [$ `  S
  9. % T  ?3 e# q/ r* L
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';0 V. Q2 l4 o4 {, z6 v
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    0 ^6 D) p4 C, u2 {1 h
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    ( X9 s. m% [, R3 Y' X0 {. G$ P
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    8 h- Y: |2 g! Z% p7 ]# a
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';4 Q# L0 A  q/ y, r
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';6 [, p6 B7 v2 f3 N3 \5 L
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';; q, Q" z% _/ w2 O! P. `" L
  17. ; D4 p" C: V. M' B
  18.   DEVICE_STATE_ACTIVE                   = $00000001;* l3 F3 w0 x: R$ ^+ f- X5 W! ?
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    - r% S8 [9 z4 z2 w9 W
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    " p2 m! k. F/ s  J
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
      E) `! V7 _1 F3 h* j
  22. & k; ]' A$ ]/ c+ n2 g
  23. type
    6 m5 _8 X5 _$ L' X( S; `3 f
  24.   EDataFlow = TOleEnum;
    1 R, K$ q/ C( y$ ~9 G- l2 Z0 A
  25. const7 E0 }/ X2 D( y4 {% |' j$ A
  26.   eRender                               = $00000000;4 p5 A. X% t8 v8 H. r) s
  27.   eCapture                              = $00000001;
    0 Y: M4 k8 P" }% Z5 s
  28.   eAll                                  = $00000002;
    0 m" z+ t$ |8 E2 n7 M
  29.   EDataFlow_enum_count                  = $00000003;5 v$ l4 \! F9 Y, p+ a6 d2 W1 q6 `

  30. ! ^+ t1 G4 n* J# U8 w% w( g
  31. type
    3 S' y, O# `1 m' v
  32.   ERole = TOleEnum;
    5 ]" i9 w8 ~& e; H/ D  ~+ a3 S
  33. const
    ! p* c" W9 V6 v6 }3 g( ^- p) b
  34.   eConsole                              = $00000000;
    , i& a: P5 ?  H
  35.   eMultimedia                           = $00000001;
      V5 ~3 P. {3 @4 u# |7 G
  36.   eCommunications                       = $00000002;
    - ]. q; i; o# G$ U. `. L6 P
  37.   ERole_enum_count                      = $00000003;3 U+ H/ O1 z/ p
  38. ) S8 Z0 g( {3 E/ l, h
  39. type
    % N1 D  H+ c6 u; p0 k
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)1 _3 W) K, y# t# D0 q1 P  l( j( }
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']+ K7 n7 R) }! ?( z5 \
  42.   end;/ f+ q" s; `; Z9 d3 k

  43. 6 g; k3 K" h0 p- q# S) j
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    0 M$ v5 z" G  O& d7 T6 }: B4 Y
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    : O  l/ Q$ {4 C+ H" S# ?) N6 y; F
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ) x; N) `' `# z% l0 T
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    9 [0 _/ f5 y. [2 }5 Y  I' P
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    & V4 d: M0 Y2 w1 r4 ^7 x
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    , {" c7 e. e) m3 p
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    4 v% C9 R9 D4 O( D, J
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    ) m1 j! a4 ?. _0 |
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    2 I$ j) U+ p$ _4 X
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;7 Q9 H; S+ b5 Q2 I
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;, a' Q! |& Q' W) `4 d1 g& I0 C
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;  m( A4 v) S0 {: _( F
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;; P, @# w# `1 s7 T
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;6 i+ K1 ^% z' j( [- y# v4 f
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    + S- B: K# c! e/ v4 J2 }
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    + g& Q& z" X/ t: J  I3 f
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    6 u' K. Q, w, s; u% Q: o
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
      P5 T9 L4 H) {$ U) K4 [
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    3 }7 |0 A. s+ W) P
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    ; Q+ d$ M7 O! m. j. m0 z
  64.   end;
    3 M* D& s* B& r5 n. S3 D; I. M

  65. ' P1 [# l+ T3 Q8 w! e5 G, p
  66. {  IAudioMeterInformation = interface(IUnknown)
    8 j4 g1 U: ]! K$ z3 }: Q! E2 p7 v
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']5 i; e% t2 T2 [; p) e$ V" D
  68.   end;}7 s- L% L# n. W9 J  r: [& B, n6 ]
  69. * L8 z9 F# ]$ j; b$ @
  70.   IPropertyStore = interface(IUnknown)# t) ?  \1 |; T" C; k
  71.   end;2 B% o" m) O0 \: \3 b# o4 @- r  k
  72. ' N3 ^" S# o) G7 F* l0 v7 T, E
  73. type# ~3 \! {" ^! i2 b: \! O
  74.   IMMDevice = interface(IUnknown). Q7 i  `/ K6 J2 ^9 O7 }5 D0 u
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    % {/ g6 ~5 Q# [* @$ p$ q3 Z# R) p
  76.     Function Activate(  refId :TGUID;
    ' F1 \# [. ^9 x2 R% r* ^, C: O
  77.                         dwClsCtx: DWORD;
    4 S% y, r$ {% j" B9 _- q
  78.                         pActivationParams: PInteger ;
    + S) I( Z9 N* M0 y5 N
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;' B, F* |5 N! W5 ]# H* C" x
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    - ?8 z$ d% a& }, x! a: ~
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    ' p, z8 g8 Z1 U- R6 b& _6 q
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    / X* ^9 s$ m* b. d* _4 q- e

  83.   i- q( D* _$ t6 L& C. R( H, B
  84.   end;/ b9 u5 U0 p0 {' {6 c& p* w$ a
  85. 0 d! M  c3 G5 G) f! u% ]( O* ?

  86. * V0 D. G, X0 |4 X  J
  87.   IMMDeviceCollection = interface(IUnknown)9 R; B; L* L4 z% Q
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    0 k3 T$ T9 r2 Q1 q6 _
  89.   end;; p/ Q$ R7 M# I- D/ v

  90. & c7 ~; Q* {7 l( G, \
  91.   IMMNotificationClient = interface (IUnknown)9 [' M0 M. [- m4 B0 `
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']5 p, d& s4 ]" X' O' _
  93.   end;4 {: ~1 B0 @0 j, P5 @- T

  94. 0 U. o& i/ U' v8 |% h
  95.   IMMDeviceEnumerator = interface(IUnknown)4 [$ ^7 @( [) @( [8 O# n
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    * p' g% x9 Y' q. h
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;5 M7 E- \) x: ?& i! l3 q
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;- F  ]; [. H: L8 Q* S$ L( a
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    : C- s$ S* r# A; _" K1 A3 ?; ~
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
      ?& u/ v. B7 @1 A3 d, F' D
  101.   end;- `9 F0 A( u% v. ?( u/ y! p3 G2 z
  102. 5 _1 l- b/ c  i" `; C9 c8 U
  103.   implementation
    % `- Y- M/ r9 e7 ~0 A
  104. end.) T' @( R' l' [- O

  105. % K& `! O+ S. E4 n9 @
  106. Thanks & Reagrds,* g) ?2 R1 z( L/ i5 c# e, b* K
  107. Mukta ...
    ) @; z3 L+ O3 @0 {7 {( I' z. N) r- D
复制代码

  1. 8 x! v3 M* M6 c0 w+ A+ p
  2. it's work in Delphi 71 f- g9 [# t% \
  3. //////////////////////////$ |% m9 \- I: v$ ]& h% h0 a8 R
  4. / [; u4 c  W6 @; r$ Y( l# s
  5. unit MMDevApi;
    6 Q% ^& n" {& ~# j. @1 ^

  6.   p/ p& z0 t) v" }) j3 J8 _7 K
  7. interface5 Q% y8 i/ v. T" ]5 B

  8. ; H7 j+ x: G+ y
  9. uses: Q, A+ _1 ?0 _# r6 @0 A6 S& F
  10.   Windows, ActiveX, ComObj;3 c( P7 g# D/ A" e) `
  11. $ B; l4 ]: L  l3 a
  12. const
    $ v: Z7 i; F- R
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';; d4 c3 Q, m/ t' _9 K4 p
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';% U* z7 x8 u: p" o' X) s# _
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    ( j6 }# t+ w) y; h3 o
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    # A( Q4 g5 t! W0 ]4 v" W- |. K
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    / P7 d8 D7 n* K
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';  V. H# e5 @" N" q, R
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    5 Z& h- S! g! _: r7 y2 x, ~5 q
  20. / J4 N  |; q2 U0 j: @1 m
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    " N# Q0 z' E5 H/ u* t. R
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
      G! k( B+ E, U0 k! ]  r' Q5 p
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    1 a" a6 f8 g8 i2 |7 T# f
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    0 _) f( x3 J) J
  25. 2 b! h+ f6 }+ Z) o) b8 O- T0 y
  26. type8 K: C5 i  M  e1 m
  27.   EDataFlow = TOleEnum;
    ( V: k! R" S8 U' t  n; p

  28. * w5 G8 o- V& a$ ]5 |9 Z- _
  29. const$ L  K) V7 ]9 Q* Y
  30.   eRender                               = $00000000;' e$ J  a( U+ ]0 D; m& |8 |
  31.   eCapture                              = $00000001;9 S. |2 g* b0 c4 |" P) n$ \8 J
  32.   eAll                                  = $00000002;
    ( z' P3 c6 s8 c5 N7 i' f3 i
  33.   EDataFlow_enum_count                  = $00000003;
    % n2 O9 K" J1 O7 n) i

  34. ! C) p/ f: H; c/ C9 o* c9 W
  35. type
      ?/ [3 W3 l3 ^9 _5 Y3 J
  36.   ERole = TOleEnum;6 E/ \! {3 o% ]

  37. $ R; I9 C# c9 c* {! `+ ]
  38. const8 Y7 Y& j0 [$ I! B9 [
  39.   eConsole                              = $00000000;
    3 x% o8 p# F! p1 }/ L8 Y
  40.   eMultimedia                           = $00000001;6 }* b0 x  F$ ?6 @( d3 i
  41.   eCommunications                       = $00000002;
    4 m3 Y# {9 w. m
  42.   ERole_enum_count                      = $00000003;7 @/ P2 o. w1 A; f! i: x9 t/ [7 q
  43. 0 o+ J2 U7 N0 [/ T7 s/ |) T2 ?0 Y
  44. type
    1 d' ?) }! F2 _4 Z* v' x
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)% ~3 A7 j0 |7 s% U+ ?  f. Y, \
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']% y& d) m- O: v2 S( |
  47.   end;
    : Y) h/ q$ w' v2 I6 j
  48. + _7 ^- s. O3 e& T, N
  49.   IAudioEndpointVolume = interface(IUnknown)
    ' `4 b+ K3 K. Q8 _  @
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']* G6 n% K+ M/ |* I/ T
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;4 t1 ~  m" i( ?
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;6 \* K6 b* e5 k' }5 _! X) ]9 t1 C4 |" S
  53.     function GetChannelCount(out PInteger): Integer; stdcall;% U( b) _2 q3 l/ z- b& z+ A4 M
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    " e0 \5 i  e8 ^! O/ Q0 U) o
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    1 d3 D* R8 T/ e! I
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    . {; G5 y, z- N3 P& C  J# ~
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;  Q* T# u  O  q1 ?2 W
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
      S7 C/ r" u5 y/ d! `! a
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ; Y+ |+ q# H% m8 J! A% G0 Q3 M7 q9 _
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;, @# a( \% h' v
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
      p: S% H% n. b# a
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    ! v3 P, ~% C3 Q9 B2 g! l$ r3 g
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;, [. g7 O3 n+ R+ X+ Y
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    5 y8 B8 s3 \4 N% M
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    & n4 M) i; @, y2 X: H- n
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;! Z% _. j2 ]: q# g5 I+ c
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;0 m1 p. w/ d6 n7 n$ P! f
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;* `) z2 t3 r. A2 [/ N
  69.   end;; A/ M% Y9 L: }" P  V4 r9 C1 v9 R1 o- D
  70. 3 g/ L( {  N: n% A
  71.   IAudioMeterInformation = interface(IUnknown)
    . Y; a  d8 L, ]+ T' D
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']+ L/ R7 ]1 j0 ~) {3 j2 I  a
  73.   end;2 S4 H) g6 M3 ], H0 F6 D
  74. 2 z3 F3 v7 X( ^/ K5 h3 {
  75.   IPropertyStore = interface(IUnknown)3 ~, Z& W/ Z4 F9 D6 c7 e. s
  76.   end;
      w. n0 e( ^; v! t

  77. ) k  L9 {7 ?0 z" z, ~, Z  D1 U
  78.   IMMDevice = interface(IUnknown)
    + e# a; i- I$ ?8 x1 L8 j
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']) t) h% Z/ w9 J3 k: N. ~. `
  80.     function Activate(const refId: TGUID;
    1 P3 F  v2 |. t' {% Q9 o
  81.                       dwClsCtx: DWORD;
    - {) c& G; N1 F0 }
  82.                       pActivationParams: PInteger;
    ' `, d9 A  c+ T' R3 P
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    / @5 e; ~/ N( f
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    & y/ w8 w+ O+ E- r
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    ) U6 |9 m' a: {8 o, |" o
  86.     function GetState(out State: Integer): Hresult; stdcall;! D5 a# a3 N) i+ J2 {* y
  87.   end;
    & A( b: e5 j2 x, }$ p! x, b
  88. 5 t3 b0 e" c( S
  89. $ R* v8 [  ^. B
  90.   IMMDeviceCollection = interface(IUnknown)
    0 a, g* I! B& Y6 r
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    : d: ^, m& @# }# V# J* r# ?. i
  92.   end;$ `# b0 ~) z  d7 R
  93.   n) l* Y, T! `" r; {
  94.   IMMNotificationClient = interface(IUnknown)
    - m: L' g9 n2 r$ f+ |
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    ( F3 @5 r+ ~9 s" ?4 ^* h2 l! t5 \6 n
  96.   end;
    4 Q0 b% F- K) [* r8 [; q/ _

  97. 9 }% p; m7 {' w2 k2 i
  98.   IMMDeviceEnumerator = interface(IUnknown)5 G5 l$ [! y! f$ z. @- z
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']2 ~# ~& L; `# O* s4 X
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    . I- S- K# B) d! s6 X+ ^/ g! G
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;: `: m0 _7 R% J) \/ \' V1 |
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;9 G1 t6 J. {5 y) B, T
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    ; K/ v/ H7 u# T# r' x# [' V
  104.   end;
      m4 _+ z2 p9 _8 Q) F% O  k

  105. : `2 a8 q" Q; M
  106. implementation6 p2 Z, T. q1 o& O6 B" Y8 L
  107.   D' [; R& O: f- K  _! Q9 U  |
  108. end.9 t# \) }9 Z/ [7 `# M2 y
  109. ( ^: B; B' e6 ]) z5 {/ c
  110. ///////////////////////
    . ]0 [1 F! w# ]7 h$ e3 D" ]3 S
  111. simple sample :)$ l0 \, l2 [9 Z; B+ }* r. y) P
  112. ///////////////////////
    # `8 M. G9 B, T$ x

  113. . @% M. K& c, x+ V4 T' A
  114. //...... other code1 i1 a& H5 s! H1 }
  115. / s8 V9 o& y/ \+ f- N  A! J( U
  116. uses ... ActiveX, MMDevApi, ...;# t  i, s  u5 A! f, r0 C9 \1 \! l
  117. & j5 d; r  z- T# Y
  118. //...... other code
    3 i7 U1 d6 S- T& ]2 Q2 r

  119. 6 |9 n! j6 J, s6 r$ ~+ Q
  120. var4 \: F7 i+ B. k: e( q% r
  121.   endpointVolume: IAudioEndpointVolume = nil;1 w9 L  w2 P2 o4 F5 Z" @
  122. 1 w' v% f5 D  c! I, n1 l) {
  123. procedure TForm1.FormCreate(Sender: TObject);
    : r# M# X8 t' I& I. T$ Y7 w
  124. var2 Z9 i4 w6 }9 i( Z
  125.   deviceEnumerator: IMMDeviceEnumerator;9 F$ E5 O0 e& V$ d  ~( a
  126.   defaultDevice: IMMDevice;
    2 V% A4 g0 K! [- X& O8 r
  127. begin
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  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
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  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);, ?4 J2 W1 c4 C4 [+ C$ k
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
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  131. end;. z4 Z: E# Z# J6 d" g  k% \8 r& B# `2 L
  132. 9 \! `2 n0 n# S& P8 G, l: m/ a6 B0 w
  133. procedure TForm1.Button1Click(Sender: TObject);; x2 [- G3 K8 M7 K
  134. var; {8 {% n* H" b% Y0 N6 b  t: h
  135.   VolumeLevel: Single;5 t" ^) T& N- l, R' Z/ G8 M% ^
  136. begin
    * N+ i( l7 W1 _6 C1 G
  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;
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  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);! T& @4 R( r. I& y
  140.   Caption := Format('%1.8f', [VolumeLevel])% e. p; \% i- h3 X+ M' X- @
  141. end;9 A; N& `2 f- I* P0 o# E  C
  142.   F" A6 N- i' L
  143. /////////////////////////////////////
    & }$ `. R: [6 c& G

  144. 9 [9 X) u8 f* z% N( s; E2 V1 x- V
  145. // with best regards ToxicDream# ?* d7 j% s' j9 _8 n9 G
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