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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-a8c9-2e27eb9ec0582 O  l" B9 d% q/ U9 b/ d
By Mukta & ToxicDream

  1. 6 G. D  y/ n6 G" j' {
  2. //for delphi 5' `8 f5 I6 A7 G% I/ D: ~1 [
  3. unit MMDevApi_tlb;
    2 e" b6 U9 W. s
  4. 8 }# t, i& Y& @& z
  5. interface3 ^, n8 H4 u) g% u) y+ Y5 |% g
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    - H1 \! R2 z. a# s, B/ ~" U; j5 d' d: o2 r
  7. const
    0 Z+ R' t- w" P# Y- [
  8.   // TypeLibrary Major and minor versions
    ! Q. k5 a, M3 P: u' X
  9. $ ?" h% Z% H% z' R1 T
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    1 |0 Z) Q0 s* R, p& ~1 ~( w$ m
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';+ D( _) i" |) @( Y
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';8 S  M$ S. x: C9 X, w
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';2 [& s+ G9 o! S( a0 }5 X& p
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';+ P. z3 J4 g- ?
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';- |& Q& i# i/ ]% {) B. E0 Z
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    + E1 s/ P! w* q- s
  17. : x! Y: o& v* k3 F! ?) k% j! G
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    2 P, @+ p! L2 J& T: m+ y
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;' r. _& S# j# ?  {# a
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;! L# U0 c  \' E* R% R
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    ! N/ \. e; `$ {0 |  ~. o
  22. * I8 H6 c% `! E: D- ~! w
  23. type' I; m4 H2 e! ]
  24.   EDataFlow = TOleEnum;
    * n7 w$ Q5 G3 x7 a, D! W8 Y
  25. const/ A; a" [: j  L/ }& V& S: B. H; ?
  26.   eRender                               = $00000000;
    # e0 R. g7 k+ d& K! L) a
  27.   eCapture                              = $00000001;
    $ E. S" h* r4 O! c6 |
  28.   eAll                                  = $00000002;6 }" v8 g3 |8 n4 H( s3 k0 y
  29.   EDataFlow_enum_count                  = $00000003;
    ; g& P% `9 J; V. e, W$ C
  30. % s9 D: }, k7 V: F$ a& z- w
  31. type* {  r* L/ o3 ^6 T/ I$ ^% e% ]
  32.   ERole = TOleEnum;
    , L# K/ M, b: c% f& [
  33. const4 ^$ D0 D: M0 e
  34.   eConsole                              = $00000000;+ V- R" m# w0 b4 e) f% |0 r; L
  35.   eMultimedia                           = $00000001;; [6 q, }& S3 J
  36.   eCommunications                       = $00000002;4 u4 K: V! e, B! e4 a" _% Y
  37.   ERole_enum_count                      = $00000003;2 T- Z5 L" d1 g* ?$ |  ?
  38. " A  `1 f; `/ x
  39. type
    . Q8 O  M- @6 ~! d+ t: P6 h
  40.   IAudioEndpointVolumeCallback = interface(IUnknown): a2 {; ?1 n' ^* n
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    , u" e) }/ a$ G; Y' F/ `
  42.   end;
    $ m5 z3 Z. v# u9 N& N: h$ ~
  43. 1 ]% Y6 I0 u# K1 D0 E$ q  T* Q
  44.   IMMAudioEndpointVolume = interface(IUnknown)6 i  L9 u$ k: ~% `
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']* ^# J! b) j" S2 i6 [- h/ {1 L
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    - i. x; N% G9 w! y- R/ M" }" Y$ Z
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;$ n& |. H' H6 v) L% A' f+ X. T
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;# q3 p- y3 `  n/ v
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    " o/ E' V! L" |& q: ~
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;/ X9 @- k- e7 P9 {$ k, T9 P
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    ) j' c! S( q$ @
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;* m- l2 }% t! k9 s
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;) ?. k+ |8 J# L* F+ \/ V
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    & A2 q: b/ r& b, k4 p) X8 g$ }
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;+ x% t- Z- }' B; x/ G' Q& |) m
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;9 p0 H4 o& M% Q7 Z; w
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    / I3 n' ^* `0 g# d/ w$ Y0 Z
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;1 M$ Q4 ?8 j3 ]
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    " a% z; ^8 {/ r
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    3 B; a$ \, Q4 a+ N+ `, X
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;3 W9 \1 Q3 u& Q: T6 z
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    % ^; X. @& I- }2 ?5 `/ \
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    : p3 d- u9 \2 r$ B2 S2 B+ e
  64.   end;
    ! G0 ^3 Y) l* l0 I% z: i
  65. : P: v0 z- M8 N# U
  66. {  IAudioMeterInformation = interface(IUnknown)
    ; V  n% A2 \4 }" U, ]/ A# d& J1 w
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    % f; t* e( S9 k1 m2 W( b& ]
  68.   end;}5 X* l, ~7 V1 x. w, `
  69. - n* c' p+ S& g/ f% y$ C+ _
  70.   IPropertyStore = interface(IUnknown)
    4 Q) O4 y* v, `" X  z
  71.   end;
    , M& b% L- _+ r# c

  72. 2 F: f' z0 A0 r1 Y3 Q  e
  73. type
    ; \% H9 r) K2 H0 `4 G" _. M: r. i
  74.   IMMDevice = interface(IUnknown)) L$ b: Z9 ]5 W  a, q7 H
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']" {" j6 W) D  \: w7 P" r0 i6 w+ [& }
  76.     Function Activate(  refId :TGUID;6 f& T, i' ?8 @7 L* ~& n* u) d
  77.                         dwClsCtx: DWORD;7 q- s" x" J" M+ N
  78.                         pActivationParams: PInteger ;
    " A+ z8 {! W8 {0 t- a
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;& y  m7 F) l2 S
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;7 ?7 l# y# H, y& q! W6 G* s
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;" ?4 u' _! g, t6 m9 w3 ?
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    * D' x& i! m8 |

  83. % f- p, ~3 X: m  d8 ^6 D* m
  84.   end;
    * {5 _# Z* `- @/ E

  85. + ?' F9 o8 h6 L" M+ M

  86. 4 W* q) b; T/ r
  87.   IMMDeviceCollection = interface(IUnknown)
    ( Z  F# L. [# [1 {! P6 }
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    $ L, [+ }& N) [& z
  89.   end;; Q9 k+ R7 m0 }% I* T/ Z

  90. # a3 ?: J' g+ f) q, {! ]
  91.   IMMNotificationClient = interface (IUnknown)* r- p7 |6 N9 t2 L, X( g
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']* G( q5 h* T6 h$ Z. f1 n
  93.   end;
    2 S, s5 s/ F8 v. d: K1 W

  94. & Q; G, O/ ]& v' b
  95.   IMMDeviceEnumerator = interface(IUnknown)
    / V4 Q: Z4 l2 b
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    ; ~( r  L5 r5 S4 a2 H
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    ! u$ B  Y1 Z; \7 d4 V9 ?
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    2 `  Z7 D+ S* Y! O7 r* [; E- V; _8 g
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    # {& {" H3 W: V2 o7 @$ Z
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;* \- G8 X% K4 S
  101.   end;  I4 R( x0 |1 J& f- ^

  102. 3 D% y2 F2 z0 M+ H) D# X
  103.   implementation9 I+ _7 [, z! [# n+ K! p
  104. end.1 q6 O; I. i! o' H( R

  105. , g) p3 [* s* \, E1 j) Z
  106. Thanks & Reagrds,
    5 s" b5 o: U5 L# g) ~
  107. Mukta ...
    # G3 p* l  {' b# {' ^' g% L
复制代码

  1. . T2 E3 I* T7 e7 ^
  2. it's work in Delphi 7
    / T7 Z1 x: L, Z8 g
  3. //////////////////////////
    2 t, A2 X  ^+ M% ~; U. m/ [* X& ~5 N4 A

  4. 3 z( T- Q. M% d) g& m7 f
  5. unit MMDevApi;4 ^9 g: K8 O2 R% v* Y

  6. + L2 T1 k1 ]4 Q( P4 z. ?
  7. interface
    9 t. ?& T8 l/ Y: I& K. w* W9 f# X
  8. 3 l( S2 L9 b. K1 l" t  c
  9. uses
    + M  V$ i; i) O% w) w  p- f2 t
  10.   Windows, ActiveX, ComObj;: Z) B7 s9 H" v0 j9 P3 B( R1 @
  11.   N& `* M, W6 C8 _( ?1 N& v
  12. const9 t4 I1 @, m; o. c: D$ l: }
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';4 D7 x3 [9 U4 ~9 S* `% U
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
      k  `' T+ E* j
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';0 u% y+ ]7 p2 g# z/ B; A
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';6 }3 q( }4 `5 i, I) l
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';/ G  v- X- j/ x- o$ N
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    6 h- g6 a* I! \  Q& t
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    6 |# c8 Z' z  G( g1 H

  20. $ t' ]3 P- T: z: u* L8 p* |' U
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    ; w* ~( i- }: @3 @
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;2 z$ t; u( f) ~& q% r. c) O
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;! A" _# ^: p  v$ X, ^
  24.   DEVICE_STATEMASK_ALL                  = $00000007;( r' i0 e' s+ A- b# K5 X. K+ ^3 l

  25. , z6 `, ?& |' \2 _) ?
  26. type/ g: W- r/ d" C! r! u/ F* g
  27.   EDataFlow = TOleEnum;  |7 A% z) |* U; f+ {8 s
  28. 8 A1 _, I9 Z' u) ?$ s' H" e) ^
  29. const1 ~; S1 b9 B% i- T4 ^4 O
  30.   eRender                               = $00000000;
    5 s  P+ ]+ O. R  I
  31.   eCapture                              = $00000001;
    % D5 ^3 @7 [: |" o2 S" p, b4 E8 i5 H
  32.   eAll                                  = $00000002;
    $ O6 g# x9 y8 B' Q. f5 r6 L! t
  33.   EDataFlow_enum_count                  = $00000003;
    $ w) _5 y# Q" h$ p1 U4 g' h' ~
  34. $ ]" b* E/ m5 F9 Q
  35. type( ~9 |7 z1 {/ J& o
  36.   ERole = TOleEnum;
    9 N+ p9 a# b7 X+ T3 s
  37. 7 L$ l8 j' n- k2 [/ v# q
  38. const: {9 A5 e) |. v9 ?. ^
  39.   eConsole                              = $00000000;
    & n1 N- P1 k( M8 e6 V$ s
  40.   eMultimedia                           = $00000001;& s% ^6 b2 \# N4 a- s. a' Z1 m
  41.   eCommunications                       = $00000002;: _% W' [" c# T9 t. V4 F
  42.   ERole_enum_count                      = $00000003;
    ' _$ ^% {& ^1 n$ v" A# b
  43. 3 Q1 H+ Q& q, N- w
  44. type
    0 H1 q3 V" B/ E" U! E6 d
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    % G  m; h4 F# D2 i& f
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']  ~5 ]5 ^; l  x' f
  47.   end;
    7 N4 g3 a  x4 d' ~! j: f$ |. e, G

  48. ! `8 S, ?% i8 U9 S& Y
  49.   IAudioEndpointVolume = interface(IUnknown)
    , j2 m6 ^+ f+ R5 Y4 P$ A" h" h
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    # M3 F4 j0 a! i# H5 }; F
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ' F% H- t) N% p/ r% F
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    5 [2 Q; I% {: h, d
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    3 ?  y: ^! m4 l/ f
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    % U$ a) w9 @2 \8 P( X
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;% y% c8 K9 [3 l
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    5 C0 M; X6 R! w
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    " D+ r" c# U0 t4 Y* c6 r
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    / @4 M: n8 N7 P- Z; p
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;! s% @- b# r$ `' N- |6 S
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;5 r% c% X. y$ a$ a7 E% @. k
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;8 {. B4 \8 Z9 I, j6 Q: h
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;# ?: q+ q' {1 t
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    4 I* J! h7 a4 r% }! ]
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;9 S  f* v3 z; J5 [
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
      M* _& B0 O8 o" h
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    / c" h  \& s$ }. i6 ?5 z; t) }
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    : ]4 y+ v' G+ h1 c
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    0 F' f) J! O" u" K0 u) h
  69.   end;# X- [$ a1 u/ y- a) W. n6 R

  70. 1 h+ u' u; o1 S! K+ c6 ]: ~
  71.   IAudioMeterInformation = interface(IUnknown)
    2 m! @5 `4 J1 N* T" s. e+ L
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']0 W& J4 U8 Y0 U
  73.   end;
    # Z7 ?  }' r- N

  74. - W/ y# n3 N1 ~8 q
  75.   IPropertyStore = interface(IUnknown)5 z& p, |; N4 S5 |% [" D! q/ L, Q
  76.   end;
    , P- P$ n4 o2 {' ^
  77. ( F+ T1 y$ ?9 W+ C  l
  78.   IMMDevice = interface(IUnknown)1 G5 T4 `' _* P" C& N
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']* \7 s% T( `6 W: u
  80.     function Activate(const refId: TGUID;
    * b. X6 G: q+ H2 |# C3 R
  81.                       dwClsCtx: DWORD;3 s7 h, x) l8 F- p8 n
  82.                       pActivationParams: PInteger;
    9 E* s: H( W+ H5 u8 b7 G. Y4 b
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    % p0 F8 |$ `4 S/ e* I
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;& `3 r) I* e& e' `* V1 }
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    1 i! c4 K% V1 [: H2 r
  86.     function GetState(out State: Integer): Hresult; stdcall;
    # e7 ?& ]1 ]0 l& @& f: H
  87.   end;
    6 C, W1 c; B7 N# h$ a. x

  88. ( g0 w( x& @; x- R* K
  89. . C+ O# c4 D4 @$ t% H
  90.   IMMDeviceCollection = interface(IUnknown)
    ) _& J' D$ h6 |0 R9 c
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']+ Q  E/ G* H" R& d3 T9 m/ A
  92.   end;  a2 x+ \5 `# _0 m0 c

  93. 0 Q( c; {6 _1 Q& c1 m, h" A
  94.   IMMNotificationClient = interface(IUnknown)
    . W! T; d$ w- z, ]" @  E
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']) W6 F! ~% N. b# w
  96.   end;( K+ F# L* s/ E! _
  97. * s8 H" i( U6 b+ E
  98.   IMMDeviceEnumerator = interface(IUnknown)) k$ k9 M! d& A9 s3 Q
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']. Y0 U1 \9 }6 E2 P5 U* @$ b
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    / E) j  O( @$ v4 ^
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;+ k; H2 A3 F  w+ @2 G- t& u' ?
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;6 s6 v# u- e+ D7 F
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;+ O: m9 U9 e3 G$ e# ^4 k
  104.   end;3 Y# a" X$ S( p
  105. ' U0 D4 m& T' M' i8 B9 R0 B
  106. implementation
    % D* L5 L- d! @0 J4 j5 W9 O5 X; I2 Z+ c3 x
  107. 7 u! e7 `5 j8 H$ o! B5 ]
  108. end.
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  109. $ F* x5 E/ {! {- P/ F+ o. E& D' w
  110. ///////////////////////0 ~& A% H$ B6 P6 E) {
  111. simple sample :)
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  112. ///////////////////////
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  113. : b, [& f3 k3 F  d" {2 |9 H
  114. //...... other code
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  115. . S2 U3 d; J, _; ~7 [8 T$ x) w9 S
  116. uses ... ActiveX, MMDevApi, ...;' ^3 Y7 c2 a5 c

  117.   T7 x9 v/ S! ^; p5 t8 X# H
  118. //...... other code
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  119. : D" F) X  T* S$ U- I
  120. var3 |& [8 a& e% ]1 g
  121.   endpointVolume: IAudioEndpointVolume = nil;, w; w, C( o5 x! d. a

  122. % y$ C$ F" C2 J
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var% \  g& z# o0 h+ o9 i8 k( c
  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);5 e* ?- Z7 z2 A0 ?) Z3 V/ s# {7 E
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
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  131. end;
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  132. 7 L8 E# W) c# `
  133. procedure TForm1.Button1Click(Sender: TObject);5 T9 [8 M: F% M
  134. var
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  135.   VolumeLevel: Single;
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  136. begin# [# A$ ?9 d) x4 O  b
  137.   if endpointVolume = nil then Exit;3 Y# t' F/ H- N. @; X* A* {
  138.   VolumeLevel := 0.50;1 `# f2 h& \) R% q8 @
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);  {" p/ |. C4 n7 E2 z8 i+ n6 v3 J
  140.   Caption := Format('%1.8f', [VolumeLevel])- G9 W' X2 w7 g- i; O
  141. end;: p' R: {* I4 }# j: C$ m1 [* O/ J+ J

  142. 1 k$ [7 o  {( P; ^5 f' L
  143. /////////////////////////////////////' K  K( i8 d( h- X/ L+ z

  144. 1 [' g# B8 P: A8 p4 z9 r* a
  145. // with best regards ToxicDream
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