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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
0 g( [* N6 ?* _1 F6 pBy Mukta & ToxicDream

  1. 9 G* G' l. k: |$ \2 g
  2. //for delphi 5# d5 Y3 y! `) C% k0 I
  3. unit MMDevApi_tlb;
    , A$ x! p9 T+ {& w5 K/ [; N% P
  4. 5 O$ Z! |: X$ J7 Z
  5. interface1 Y  m0 O) h3 }, M0 @+ C- V/ s- E0 H
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;7 F. j/ E# |; U: X' n
  7. const
    - ]* E0 k( |  t$ j& P
  8.   // TypeLibrary Major and minor versions9 Z* u  Q; P) |" u
  9. % k+ |1 S/ @' I" i/ @
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';$ f9 j( x$ A. @% \
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';  A) Y/ t  W! z* D
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';  A- Q; A# X# _" |3 O% J( Z
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    8 }: m+ ^8 j3 ]" ~. t
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';. E7 f. v8 i* m% f' c$ H9 i
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    / n) u' b( R3 s9 G
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    / N: Y, b# Y6 x9 b  s' A9 ?, m
  17. $ C+ T9 Q. y. J4 ?$ h, [' F
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    ; g+ o5 D% D" [/ j! Q' O; i1 ?
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;- e; B1 r0 Z& A- G( c
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    6 J6 u8 C2 @! c6 H: y  C
  21.   DEVICE_STATEMASK_ALL                  = $00000007;, V! l* x; O% R' |1 e

  22. 2 {. D% N( o8 r
  23. type
    4 a( G/ d5 S2 }7 b# z0 @$ w
  24.   EDataFlow = TOleEnum;
    ! ?, o& l# }8 f% ?, N
  25. const. }" L" g8 D2 G8 C3 n6 R
  26.   eRender                               = $00000000;8 M4 u9 u& u5 G  A
  27.   eCapture                              = $00000001;% a6 J/ v4 P4 D9 j5 E5 l9 `
  28.   eAll                                  = $00000002;* [- H1 i7 h, D/ a
  29.   EDataFlow_enum_count                  = $00000003;1 t1 G$ q) w5 v! Z7 V) o
  30. : B' g0 X. ?* P& h0 l6 s3 M  K
  31. type
      w- W8 a- R" ]! L( S; T% @
  32.   ERole = TOleEnum;. S$ d7 m" q# h# j
  33. const8 u* K0 `! X& X/ [) o
  34.   eConsole                              = $00000000;
    4 G5 ]0 a3 k: ]. `, l
  35.   eMultimedia                           = $00000001;7 E2 T2 y5 C1 ^
  36.   eCommunications                       = $00000002;; N  o0 c1 X* ^. Y3 {6 h
  37.   ERole_enum_count                      = $00000003;  O9 |3 R# V+ f9 y( {
  38. * E, p% X2 {, _. Y; U$ i
  39. type3 W3 b9 @' {0 n! v) D4 A' y% T9 Q9 S
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)2 Q5 O$ ^+ v; u  e% L' ?# s/ V( d
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']0 I' u! T' |/ k5 |8 |' S7 q2 v* s) y
  42.   end;% S3 F% g; B8 J5 A" D+ H" M

  43. 9 u5 v9 ?4 z1 _) `3 s1 m; \
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    8 z  {7 K; C& U- V$ o5 m$ K
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    & Z4 o9 C1 }& `$ g/ l
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;9 Q0 S7 _& U+ H: P. f
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;9 G: o" L8 s, ]
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;; W6 m/ E" T7 Q/ t
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    - z8 i" }  M# T( s
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    : y# N2 K6 {( M
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;7 Q" ]6 w; ]# }5 O. Q7 x1 X
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    ) W8 M% i3 B' J1 i
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ( {6 N; C/ i& p; E4 g  i
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    * O) N5 J3 _" A9 W) o0 U% q4 i
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    * j6 C( h6 Y5 {, _
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    & M# j: S0 i& z* r- E
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    - _2 D3 d0 C- k- H# W$ }
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;* {; v& c; v  ^# K
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    2 \7 A: g: g6 o1 H! B
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;; Z3 C2 G1 g$ k! G: G- C
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    , }5 G# |. s" f
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    : |6 N& i$ ~! {& ?
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    0 F  y/ m3 x2 `
  64.   end;! a# E/ s& C4 E& X9 U0 f
  65. ; Z0 A4 A5 C$ C: |
  66. {  IAudioMeterInformation = interface(IUnknown)/ f4 z; N7 a. K; T+ u+ w& t; K
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    7 \  ]- R+ V  o" _. e
  68.   end;}- U! F; R6 o0 R' B
  69. . Q2 x* m+ p. @- I' u! B; h  n
  70.   IPropertyStore = interface(IUnknown)7 @+ [! B' w+ l0 A% O# L
  71.   end;( q! |' u+ x* {  w1 }
  72. $ ^. W/ ?7 d0 l% ^" s- D
  73. type4 I: t1 C7 p8 J: n  B
  74.   IMMDevice = interface(IUnknown): ?/ L( k6 C7 y7 B5 b! b6 F- f
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    . b! a. S; k9 L) ^1 }9 c
  76.     Function Activate(  refId :TGUID;
    0 G; g; ]( ^. K  O! u
  77.                         dwClsCtx: DWORD;9 }: Q: g% l: n
  78.                         pActivationParams: PInteger ;" y3 D+ b0 u- g9 [5 Z7 Y
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    & M. @1 v* C5 C7 t% |6 s
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;, {) K4 @( U  r6 f
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;( B' T6 k% G+ M: }
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    ) {$ t' n  e2 R9 T
  83. 8 Y/ k0 i/ P" |" A; W( T4 B" V3 [
  84.   end;8 D: e' O- m, \

  85. 4 U1 P: L! U+ J& N) g+ G1 H

  86. : s" z. n8 N7 V, J9 a
  87.   IMMDeviceCollection = interface(IUnknown)* M+ x7 d6 Z; W
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']0 w1 ~6 P% c. Y7 \- u# k# m0 R8 u" N& P
  89.   end;
    ( z! p3 Y5 o- k% h; X* i4 ]
  90. : k/ @3 S* S9 f3 P8 J
  91.   IMMNotificationClient = interface (IUnknown)( Z, v! Q+ A" H, _. T
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    1 l; C# h! D! v) R1 W' W) l- f
  93.   end;( `8 y4 i/ u1 O- J/ j
  94. % w; y$ F: ~: I* ]7 P
  95.   IMMDeviceEnumerator = interface(IUnknown)& G+ X+ ^; Z" g5 `, Y
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    & j7 y) e# _4 |/ S3 M
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;8 ?# q1 \+ _! J' X% O1 x# O  t
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;4 D& R, m# J" e; i9 j5 A8 L3 s
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;; a: ]7 p6 T/ x% M' Z2 k
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;8 n# D6 B# Z1 J; q
  101.   end;0 f2 _3 N/ D+ e4 Y$ Q9 N" c* {
  102. 4 U0 H1 U0 S0 o. U  N% j0 A+ C
  103.   implementation, k9 g( S9 \& s
  104. end.* O* W. Y$ S5 F

  105.   `' m* o4 Y# Z! h: V, `
  106. Thanks & Reagrds,2 R/ o: e2 w- e0 [! z! e. \$ L2 C
  107. Mukta ...
    " [/ c/ i5 d% @  \. M
复制代码

  1. % \8 N% a0 \7 Q+ M7 v$ d: G. A- n
  2. it's work in Delphi 7! p8 p* y. F% y1 t* x
  3. //////////////////////////
    , C1 h: @3 c  \% X

  4. 3 p9 d, Y$ v3 f+ U) w& o1 O
  5. unit MMDevApi;
    3 U, J" P( S9 W9 c. [7 i6 o# e: ^3 d7 K
  6. + @% k& n2 s4 r" d0 E1 y
  7. interface- {. {! {" z7 x: P$ J" @

  8. 5 N; |# J7 C0 C* [
  9. uses% R' K/ C& |- T$ g
  10.   Windows, ActiveX, ComObj;
    7 E; ~8 P9 ?- U& Q

  11. 8 A9 e0 L# i# T+ L( u' G7 {; U
  12. const. X% }- a( {, N
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';2 `+ t* c/ \  c6 z3 I7 e- u
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    9 G0 Q7 K4 v$ H: n
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    3 X# M* R4 b* r2 a; o! S; K% A# A
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    2 Z) g7 E4 s1 C* R$ S! T4 V
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';' i2 u  x, X( \. f. y# t" N
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    ; s' J9 D2 `7 L
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    # K7 N1 Z" g( j- ^8 \4 I* Y

  20. & \" b( S5 Y3 g, b
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    $ V/ u0 k. e. o7 {8 A. O
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;0 Z4 d. ^5 V4 A3 v9 j
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;; f' C3 X: h; C$ C
  24.   DEVICE_STATEMASK_ALL                  = $00000007;1 n7 O! h3 N# q
  25. % t* Z6 S/ ]( C( X: J
  26. type
    . z2 ]6 o# h: e! V- }+ K& w
  27.   EDataFlow = TOleEnum;  p- Z- p/ c9 A: J/ R
  28. 6 G) L; O! a- y& D2 l' q* P
  29. const4 l$ S- M' ]" K% x* P
  30.   eRender                               = $00000000;
    $ k) P  h4 \% E( {; d5 O% x
  31.   eCapture                              = $00000001;
    2 ?3 R' V; M7 X
  32.   eAll                                  = $00000002;
    9 \5 b5 f/ g- V/ b; ~6 t
  33.   EDataFlow_enum_count                  = $00000003;
    8 R! c  k8 _0 c) n2 I

  34. + f5 G3 c3 q+ ]2 ]8 E
  35. type
    " P  B' g, j5 E; x& I
  36.   ERole = TOleEnum;
    0 P3 X8 ~/ P% C7 C

  37. ! ^) l1 H! Y! k, J0 _# h6 _
  38. const
    5 O3 i& m, l6 ]0 r" h
  39.   eConsole                              = $00000000;2 P* m0 Q# R* g! W2 P
  40.   eMultimedia                           = $00000001;
    % B; u/ M8 t" _/ l5 h
  41.   eCommunications                       = $00000002;( y) u0 g5 [3 k8 y( o+ r4 K* b
  42.   ERole_enum_count                      = $00000003;7 ~' z5 b! N/ D) B
  43. # v% L. \! R( l+ \& r5 U
  44. type, m6 j" c- Q4 t" ^' t9 x
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)2 B" h9 c, K; Y8 T1 e- m7 ]
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    0 N! H9 D+ A" R5 N+ q  g9 ]% o( Z
  47.   end;
    & Y1 T4 g" y3 X% w' X7 w

  48. - S5 K$ g7 I- R; S! u
  49.   IAudioEndpointVolume = interface(IUnknown)
    3 S3 m; J' c* L; r! i$ u4 X' g  z
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
      v8 D2 C3 G' P. e0 a+ G$ D5 \& R( t
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    $ {  T+ G1 u9 V
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;2 v) J" z, ?9 |% n( k6 B
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    1 i6 q0 V6 z# S/ ~5 @1 n0 R
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;0 O9 C3 h& P: w  o
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    & }. O" R, a. a+ ^  S0 P
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    ( v3 b  q, q) J1 ?5 s$ [
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;- W3 X! g% z* H5 h! K) Z; n" Q  e  b0 i
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    2 w. n" T" \/ Z, ~& E7 R- c& G
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;. N$ X3 B- W& o& ~6 u2 o
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;) p3 R4 ^1 R# e6 Q8 S( l
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;: g6 j* W4 m, z
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;, F, f. {$ w) R! Q& f
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    : }# v0 G, v: B. K
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;& ^7 ?8 W, s0 R8 p0 z# a% a, w
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;$ O, @' O0 a- S# {  m# s  [
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    8 t- E# H- M. y7 h, o
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    6 P# L* B4 s" j; D
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;! R9 e( l% P& v* C) ~* v4 ^: l
  69.   end;
    . M4 t' F" M: s7 W

  70. ( ~2 S+ R" I! d2 L$ G7 d0 S# d4 D# N
  71.   IAudioMeterInformation = interface(IUnknown)
    5 {0 B: L# |. C* A
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']1 W% J  _& i4 s0 D& {% Z
  73.   end;# n; O" B  I  h+ b2 V
  74. : T/ k- ]) ~6 w8 \
  75.   IPropertyStore = interface(IUnknown)
    * u% K4 U3 p6 ], R- D3 ^$ M
  76.   end;
    ! V0 o1 m' U# F* T! A
  77. 6 F, |; |" F( z, q; F
  78.   IMMDevice = interface(IUnknown)' Z0 E. C: e8 v, x: f5 [
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    0 _; ]! |0 K% q* F9 c6 X2 K/ L
  80.     function Activate(const refId: TGUID;
    6 W; r0 B( o1 d% {1 W
  81.                       dwClsCtx: DWORD;4 F1 Y) j1 _2 C: y" R1 o6 b2 ]$ F
  82.                       pActivationParams: PInteger;) x0 C2 n3 q) f
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    ' h$ ?  l  @; ?; P; D* J- Q( v% F
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    0 {9 k, j2 c1 o. q
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;& {0 C5 J  _6 Y8 y& c! b
  86.     function GetState(out State: Integer): Hresult; stdcall;
    ' s% Q9 P0 f9 l+ c
  87.   end;5 e$ @1 Q% t1 U
  88. , Z( z# s& p/ r/ c% v+ ?6 T

  89. $ Z0 b& H. ^8 u$ I+ M1 r
  90.   IMMDeviceCollection = interface(IUnknown)
    4 D, L4 I- `$ u$ W( i
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    " ~8 w% G, r1 q
  92.   end;" f, @+ F2 Y) l3 z/ k  ?3 J' ^
  93. 0 V! G$ ?9 |8 r) Z6 X
  94.   IMMNotificationClient = interface(IUnknown)9 G. D1 {" P1 P* [% o4 l
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    . _3 V! S( W! W1 {5 T" p. }
  96.   end;2 B3 j/ M& z3 K  c$ h; x4 a% D

  97. + h% X% t6 c& V6 J
  98.   IMMDeviceEnumerator = interface(IUnknown)% ?4 E# p. H( j" G$ `/ g* D, P
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']7 \" f3 s7 I1 n7 L2 ]
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;7 @' x8 w, u; g0 @2 p& ]
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    # e, a6 `, Z- Y7 v! K
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    / m2 Q9 w3 {& _/ P5 X9 ^) R6 R9 N
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    0 l; Y! r) m# g0 }* t2 Z# F' F
  104.   end;
    ' A! ]  w% n4 S+ @+ X# }: f2 K
  105. - r& [5 R' C. \
  106. implementation
    ; M/ V; o# `2 ^

  107. 9 g8 ]& q& b7 |( c& K
  108. end.! o* R( r* v8 _

  109. 8 R( s, K. \$ r9 L- r
  110. ///////////////////////! o! X5 p" {1 m
  111. simple sample :)8 p. d0 c4 f/ d
  112. ///////////////////////
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  113. % i" \0 T" ^- x& k! `3 _
  114. //...... other code8 A" }) L& o- t3 I2 Y

  115. - k( O% F& L# K8 n
  116. uses ... ActiveX, MMDevApi, ...;& M) x" f9 s+ {$ G. G8 I" ^. B; l& u& H
  117. ' `. z. j$ |; e0 }
  118. //...... other code
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  119. 5 K7 j1 z4 [' c* b  R8 h. L9 Y
  120. var
    1 u( z8 X6 N- ]6 M
  121.   endpointVolume: IAudioEndpointVolume = nil;
    # V9 X6 k. ^, s7 N) s

  122. + p' V8 s" q1 {% g
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var: p7 ?7 D  n2 C7 w& k
  125.   deviceEnumerator: IMMDeviceEnumerator;
    9 I9 e" j! A5 \. i" }
  126.   defaultDevice: IMMDevice;, o- a  [7 `( l& m- \9 u
  127. begin) p' a% E* O8 ^5 u
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
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  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);: i: T# J: f# T% L3 O
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
    ; U! e% {4 R8 |$ c1 q8 @
  131. end;
    % C" a4 m- l& s  e# |" s5 x

  132. 3 m3 l6 f# x8 C9 L( l! {
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var
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  135.   VolumeLevel: Single;% E/ T6 m; h4 j0 a! E
  136. begin9 X0 o: k+ Z# ^  R
  137.   if endpointVolume = nil then Exit;
    . O  b1 U) O: _/ m* m
  138.   VolumeLevel := 0.50;
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  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
    # l# y0 R5 H5 s3 z$ M$ b& _5 Y- t

  142. $ v$ R* M8 s! m4 |9 T
  143. /////////////////////////////////////
    ; V- ~+ w: q2 x7 L2 V; U1 s6 a
  144. 7 O9 `3 V: H' d( q- i. J. |
  145. // with best regards ToxicDream
    8 M+ C1 c/ F# {- x+ s
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