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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' P% u4 m3 {1 y* Z, ]: q# T
By Mukta & ToxicDream

  1. - |$ l; I5 h( [3 l
  2. //for delphi 5
    5 D  [, I( ~; h0 H) U/ X
  3. unit MMDevApi_tlb;- X- H# a4 L" V2 _( K) Q6 @2 ^. e* I
  4. 7 E  p. s$ Z" s+ V/ V
  5. interface' a- S+ B2 p+ r
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    ' ?& G9 x6 z  i8 X: _
  7. const4 X3 F" L! t7 ~
  8.   // TypeLibrary Major and minor versions
    % X- g! u+ {. L( Q3 q
  9. 4 y( O* d3 D3 [# z
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';/ Z% Q% ^; X; c. K; a' K1 u1 Z9 Y' ^
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ; [% o9 Z9 l( I% N9 E% v
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    / s' U" ~/ k6 |  Z5 M
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    8 b+ \% E# ^# Y
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    1 b3 \$ W3 g7 ]$ f7 x
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';- B2 \$ y# g( e7 b$ v- n9 s
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';1 V4 B. D8 Q3 E2 @$ q+ \$ P1 S
  17. 3 K' u2 k( X) \& C1 l. D/ S" t3 g
  18.   DEVICE_STATE_ACTIVE                   = $00000001;8 E, Q  v" J3 V) h
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;; r+ M( t0 z9 F# `
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;  P" Y- p1 F4 u) U9 V; x, p
  21.   DEVICE_STATEMASK_ALL                  = $00000007;. f/ D& M3 U+ O

  22. + L/ f2 U) r4 _1 v
  23. type; C; I+ m9 L9 p* l' O
  24.   EDataFlow = TOleEnum;2 a8 z  x% y2 e/ B8 Y0 P8 A' ~
  25. const
    * y5 |& z- W. Y
  26.   eRender                               = $00000000;$ ~1 P) x! C2 i% i4 n% X
  27.   eCapture                              = $00000001;- u; F5 G4 e9 P  ]% a1 u& x3 J
  28.   eAll                                  = $00000002;
    ' G0 b1 I& t( i1 Q. T' g
  29.   EDataFlow_enum_count                  = $00000003;# S, a4 r( x" C2 p7 y
  30. $ Y, W4 E, h# }6 O5 l. k2 {: M9 c
  31. type
      w' Q* y- `8 [
  32.   ERole = TOleEnum;  t- i. ?2 D2 i
  33. const& p  r: Z; z2 s: N: o3 _# E
  34.   eConsole                              = $00000000;
    ( P" _1 t0 i9 M7 E
  35.   eMultimedia                           = $00000001;
      T  [9 v( P6 _# v3 e4 u) q/ {
  36.   eCommunications                       = $00000002;
    6 J7 e5 ?. d7 N% e
  37.   ERole_enum_count                      = $00000003;
    6 b* w% l4 a, S! S4 Z  q) A, S

  38. 8 [9 a7 E. O( s' l5 b
  39. type
    4 U4 e$ f% D' O
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)+ Q: ^& @; ?; @; e; ^
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    % P  d+ n( M( U) U1 h" ^. P% F
  42.   end;
    3 s! M: t# e; U7 O, F: o
  43. : x; {7 K$ S+ C) s; H/ P7 u
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    2 J& g  W8 e! ~+ X/ h+ o
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    # `. N# g4 X" L
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;7 D, {2 l% d  h- k9 @
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;& H( ]+ q! J) {: Z: i6 E# I* z
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    ) S7 `9 m; Q3 P9 \
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;" z( M( e; t0 N2 c6 o( `: E( N
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;, d1 S& J9 }6 t; B8 C  r2 b- @
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;2 f% k! z! p% p! f# F4 E5 o: F' k; R
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    7 H6 V; X( l, L3 h% ?
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;* r" ^& L) |# G0 _# T, M) m
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
      P. Y5 k' R* Z! A, x9 I( }( f. J
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;8 ~9 @+ s) @, p- n& V5 C4 s
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    2 v% ?/ h) ~* N
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;9 F) g9 N& r- l( s
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    & M$ U' E3 N4 Q9 M0 k# @# ~1 Y
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;/ ~- I$ E: N# t, u$ b
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;2 _! [' \  Y" z, g2 Q- K
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    9 {  \9 |% L$ X
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;# o' c2 L& Z& A- M! ^. e
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;6 z* U: z6 y! n1 `
  64.   end;- ^2 ?8 `! n( u; a1 g% `
  65. 6 e5 }- ]& ?* f6 i  U) G; E3 v
  66. {  IAudioMeterInformation = interface(IUnknown)
    + T- P8 Q% P' K8 L& B' c" v" P
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']. P6 ?6 ^. D, h8 }" I
  68.   end;}
    / [2 U1 G# G+ Q: `; s* B
  69. 3 F; k5 p/ C$ |) O8 h
  70.   IPropertyStore = interface(IUnknown)8 r+ }# O9 q+ [; R% X* o
  71.   end;
    1 L, {3 n" B( r- }+ k
  72. 6 A6 h- l, D; A5 ?3 l
  73. type2 Q# J  k! y' i. n9 v9 \
  74.   IMMDevice = interface(IUnknown)+ r8 a! ^' }9 Y% J
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    ( @) Y: I2 O! a5 v5 d* r
  76.     Function Activate(  refId :TGUID;  F" D# [& U- p+ n$ C' l9 L  ], b
  77.                         dwClsCtx: DWORD;
    : Y" x# D2 R! }$ R$ h% _
  78.                         pActivationParams: PInteger ;1 [8 ]8 r* o: f9 L9 H0 U
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    + Q4 l2 ]* ]: L+ Y% Q% }& {  ~
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    + E$ g  L1 i, W
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    0 U, Q% Y- Z0 c7 A1 H; g  d" C! i
  82.     Function GetState(out State :Integer): Hresult; stdcall;) Z+ o, L& I, _3 r6 e% d

  83. 9 H, o( g4 f  A) x. M
  84.   end;, w: R  S( P5 s

  85. ' P& P3 x; L6 Q1 _2 N1 S* m; q8 ~
  86. ! O7 [# D3 k8 Y
  87.   IMMDeviceCollection = interface(IUnknown)
    7 H3 T$ v3 ~- d
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    : _$ Z& R! I* ?1 u
  89.   end;  F7 ?! C) J) Z

  90. 1 e) l9 ~8 x5 B5 Q$ A
  91.   IMMNotificationClient = interface (IUnknown)
    7 K3 E% _0 [- X+ P! E: ]
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']$ `2 {- c) P, g! }+ ?, ?
  93.   end;
    % P0 K" v0 |! h. r
  94. ; P( N6 o1 K) n. U5 b4 u
  95.   IMMDeviceEnumerator = interface(IUnknown)
    $ b$ ]: }5 d" t+ f( P$ ~
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    : V6 ]8 E% D2 o1 m0 r  U4 C% e
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    1 ^4 e. l; O+ f5 K7 C8 _
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    , e- @4 {* n1 R
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;0 t3 a' J" n( d5 Z
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;+ r. H! i4 p7 N8 D3 ]3 `
  101.   end;
    0 K  X" ]4 ?/ G7 u9 C( N5 Q4 w3 q

  102. ; q- o$ y5 M. W2 D7 l
  103.   implementation. K! a, |, t% n; h5 R6 D  o* B: K" h
  104. end.) S, A" g; u; o& y% K/ w' r9 K& v

  105. 5 [- ~# {4 n! K, _# J
  106. Thanks & Reagrds,
    ) C9 f0 u+ L1 v7 D' d
  107. Mukta ...0 z" ~* {& P0 z# O
复制代码

  1. 5 |: m, G/ w$ I& j% U+ B0 i
  2. it's work in Delphi 7$ |/ e- b  k& ^
  3. //////////////////////////
    % A, ~# \: [' X1 D3 b2 Q" k

  4. ! V! y4 O2 S; Q: B" J3 A  y
  5. unit MMDevApi;- Q3 B) F9 ]% h& y$ p4 [) z% t  A' s

  6. 9 |# b9 [9 b4 m% x; s5 f2 R0 ]
  7. interface
    ! I8 s0 c2 d5 D1 S

  8. . |- `# V9 x3 v, p
  9. uses7 p2 L& r/ \. R8 G' L
  10.   Windows, ActiveX, ComObj;1 B) B% H# ?4 N# \9 F  v1 E' i

  11.   f; m5 H8 O$ n1 X
  12. const$ u$ ^) a- B% R
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    , T: ]/ D$ D7 n- f+ t
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';/ ], C, k- o$ r
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';7 u5 h2 `1 w) j! r7 _
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    0 J" Q5 _; `' B  @9 k5 Y
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    4 Q- R3 P2 u& x6 w6 K) \
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    & ~+ S) K7 {) a3 }1 G
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    7 W! H5 P; V7 {7 E- v& I# I  g

  20. 6 G4 R5 O% j& j
  21.   DEVICE_STATE_ACTIVE                   = $00000001;$ ?' i; _- `8 ^: j: h8 U
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    ! f% ]) t( P  j' ^
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    / t# B2 a3 v  |3 C
  24.   DEVICE_STATEMASK_ALL                  = $00000007;. n- ]3 Z" j, p9 _

  25. 3 r( h, u( j; F) {
  26. type
    , X6 E- b. F$ Q2 l
  27.   EDataFlow = TOleEnum;
    8 [  l* a5 o" A, X

  28. - E7 C7 J2 _; B8 D
  29. const
    + [6 X9 A& _) k% E9 d& ~, H; j4 F  a
  30.   eRender                               = $00000000;
    2 X- l, z' @/ g( {
  31.   eCapture                              = $00000001;
    0 ~8 {+ \8 r" u- [* A2 o1 e2 O
  32.   eAll                                  = $00000002;
    " a: R$ I" t) ~6 _: m% k! c3 H* r6 B
  33.   EDataFlow_enum_count                  = $00000003;
    ) a5 Z# J/ I# ]1 R
  34. - m+ M* u$ Q% ]
  35. type
    1 N9 W* i$ w! S2 H1 J+ N
  36.   ERole = TOleEnum;
    0 h9 n' @/ O  z$ A
  37. . K& u, Y/ v  ?/ e2 V" p
  38. const
    * J8 B5 c6 \  |- P9 L- t; W
  39.   eConsole                              = $00000000;# j+ I# s7 Y8 N% {7 D
  40.   eMultimedia                           = $00000001;( S" `! o* ?+ {+ r$ h) W
  41.   eCommunications                       = $00000002;
    " o9 `. i; e0 r4 h# Q" ^
  42.   ERole_enum_count                      = $00000003;5 W* k6 `0 b: H2 p0 K0 K% O

  43. - t1 F) }% v* E8 m
  44. type. y3 m5 v. Q4 ?( p( o
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)1 W) l5 @" A( V" S
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    . J' M7 D+ x6 @% Q
  47.   end;, O; q4 O& w' @) w2 w- N7 a# }3 Z
  48. - m7 V  k  z1 a# K
  49.   IAudioEndpointVolume = interface(IUnknown)) q* M# c% c" L/ n1 I
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']( r' E+ G$ Y4 p/ [9 V. Y
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ; H- \7 @* I* o. q8 @5 `
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;# G5 E3 Z+ ]+ q6 f; M6 Y9 N3 T
  53.     function GetChannelCount(out PInteger): Integer; stdcall;+ r' n+ k3 u7 D3 ~. A7 V
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    0 W# A0 r+ ]/ \2 `! z" H& M
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    - y4 l4 ]* K9 t7 `# _
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    ! y; J& o5 g  m: s' t! M- b) a
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    * ^. M* E- f% J2 q" N' p$ H
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;; R9 ^/ A% S" m4 ^
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;, H1 l* R& S2 T$ n$ o
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    6 P1 |4 y* C) N" l$ r
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    2 _8 B# R" s$ e1 _" ^1 f
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;" T% H3 }! B) Z( Q
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;3 S- F( f1 k# U% a5 y# ~8 Y# u
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;; G( W; z* d  K8 H" O
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;% V, F" l/ }9 Z
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    2 _' E5 y' H  r0 R
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;5 B3 }& ~8 ~) V! n
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;% p& t/ p* _2 B4 D: t, l7 k
  69.   end;+ j. [/ q1 o1 v/ L+ V
  70. ; x! {$ A% S8 n* ?+ ^0 b
  71.   IAudioMeterInformation = interface(IUnknown)6 [# T8 J: m% g; Z
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']) G- E$ s: F+ L7 |  J( M& z* s
  73.   end;
    # [% B7 E0 D1 x6 M# ?

  74. " t4 C- {, h$ I: x" m
  75.   IPropertyStore = interface(IUnknown)8 m' X+ n) c' E1 b1 U  t$ ?
  76.   end;" Y6 V$ `+ X6 u3 _

  77. 5 j5 T" Y4 K& ~2 s
  78.   IMMDevice = interface(IUnknown)
    % }! L8 R4 W; y: A4 K- k/ j- Z( {
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    ( X) {4 K. q. g  m$ f9 b1 Y  I
  80.     function Activate(const refId: TGUID;
    9 x* ?/ r& z* D5 `
  81.                       dwClsCtx: DWORD;: R7 a& i* e8 b4 D% H, |
  82.                       pActivationParams: PInteger;
    0 r# t$ `) L3 o+ n
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    2 \9 O- a. o2 Q/ s( c& E( h
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;# r2 f; K. J" `! F
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    $ ]- v6 n1 O* U1 I1 z+ M7 J
  86.     function GetState(out State: Integer): Hresult; stdcall;/ @4 {, Y1 B) u& s; P$ x3 b" }' |7 P
  87.   end;2 g! @4 \' u- r: l' n

  88. : P% {  o& G6 ?* J
  89. 6 Q4 Z+ o; J# Y4 M0 d) Y. k
  90.   IMMDeviceCollection = interface(IUnknown)  H5 h0 J8 J& m" j7 o
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ! \! E4 F7 h* D4 V4 r# w5 j
  92.   end;
    7 S9 N  C  h# J* Z! g! L

  93.   W0 K1 g; B) T8 {2 E; B/ S
  94.   IMMNotificationClient = interface(IUnknown)
    1 `" e) g- r( z' W* f; D
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']/ z; m: y% z  G% x' g' ]5 {; M
  96.   end;
    / Z: J! A4 A. A4 E# X
  97. 1 h+ n( U7 p7 C- ?2 u
  98.   IMMDeviceEnumerator = interface(IUnknown)
    4 P" ^9 ~8 L2 ^# H
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']8 K9 Y) {' b# I0 y* y
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    2 P- l$ A- N7 ^
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
      x* Q" S/ z  W/ t
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;9 j5 _# z2 }1 r
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;, l  ?# E9 t0 {
  104.   end;
    6 Y: z% y. E) o% {9 d  T7 y& Z
  105. ( s# y6 y, ^. k! D# Z* E8 j
  106. implementation3 x, j% h3 O" j3 g; `

  107. . S* m8 S+ p2 ~; Q6 j4 ]
  108. end.
    3 G. y2 J- r5 W0 v9 g; K

  109. , J0 h  O3 h& D& E9 D1 r7 o) E. f) h
  110. ///////////////////////* A% H' T; o) K& i
  111. simple sample :)
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  112. ///////////////////////( \6 _2 K) @" g# W  t: U$ |6 I
  113. ( `- o  p3 J. n: l3 c. s$ t3 M& F
  114. //...... other code* p" j9 t. [  U/ e5 N6 a; b
  115. 9 S/ c2 w: w% Z
  116. uses ... ActiveX, MMDevApi, ...;
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  117. & J: I0 ~' {( ?* l2 B( C
  118. //...... other code
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  119. ( Z- m: Q9 H% d! M1 g. y) o" [
  120. var
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  121.   endpointVolume: IAudioEndpointVolume = nil;2 r* n+ U7 I, i

  122. ( i. j6 v% T) X* Q# @
  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
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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);
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  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);% y: k+ a8 U! ~5 z8 G% S$ j! x2 @  v
  131. end;; A5 h* |! J) z# m
  132. 9 I- r9 B5 M' t: f( y
  133. procedure TForm1.Button1Click(Sender: TObject);1 R. F) v( i2 q4 N0 U% [, O
  134. var
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  135.   VolumeLevel: Single;5 t/ ~3 M( Q, B! P3 G; F& o
  136. begin7 {- V- V7 c9 Q
  137.   if endpointVolume = nil then Exit;
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  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;
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  142. ) j: b' M# u- N7 M. u' @4 w
  143. /////////////////////////////////////5 Y2 S' S8 _7 g" z4 @: _

  144. & Z3 @( T9 z. j! _- E6 U* p5 M
  145. // with best regards ToxicDream$ R4 Z  j& V3 B" O4 m7 U, W& N, U
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