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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
$ g0 {  U& ]$ `) W( X  `By Mukta & ToxicDream
  1. * l' `! V2 ~: O2 u3 Q
  2. //for delphi 5
    ) a, o  ^6 p) v' r9 k& u3 j
  3. unit MMDevApi_tlb;
    + t' s( U) e. x4 m! a
  4. ! N! J* N5 _6 a3 n6 b+ L# t! ^
  5. interface! u: S3 W: j+ b
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;2 a! q2 h# u7 J
  7. const
    ( l* B# W( ?$ Z" Y
  8.   // TypeLibrary Major and minor versions
    ! x. w8 Y/ C+ d3 w# @$ `% `

  9. 5 n1 d$ ]0 a. T+ {/ Q3 C( c9 t
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    3 E0 n; N3 I% y6 b( b
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    % ~8 {2 `' F6 C( |. Z' w- k2 A, ~7 D
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    , C: }0 ]! {3 k  R  D' J
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    2 c9 c/ {3 H" f; I7 g
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';$ c. r6 ~$ t) K, q
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
      H4 s, f0 @3 a- ]  k! q: v& F( Y
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';, l1 ~' a5 G9 `2 R/ y
  17. 3 ?, B& v, v" {; j. n8 _
  18.   DEVICE_STATE_ACTIVE                   = $00000001;$ V6 W8 O2 B2 |7 U3 ?
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;2 T0 \. B1 o0 x% p4 M- K
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;) c3 M+ {1 m/ Z8 o' F8 m( K( D
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    $ |7 q$ _: W  `4 Q
  22. # f1 s2 k% ?* H
  23. type- C1 U' [6 u7 x  Y- l, M7 k
  24.   EDataFlow = TOleEnum;' n( G0 m- y! _! v% Z0 v% \
  25. const
    : }4 M0 |. T4 C6 Y0 }/ d' w
  26.   eRender                               = $00000000;5 M+ e9 H/ D" G# l' L5 g( f
  27.   eCapture                              = $00000001;
    9 B6 q3 I& C$ q; t! H& w1 w/ k
  28.   eAll                                  = $00000002;& S" c$ Q2 V0 P+ j# v
  29.   EDataFlow_enum_count                  = $00000003;% \# z) a( |% T. g4 D) {. M

  30. * X* j- j( G; p7 G8 [
  31. type
    9 B2 f+ S" Q% \7 J6 ^  g, ~
  32.   ERole = TOleEnum;8 l0 O2 R+ \( s4 J, j4 N) |6 f0 _
  33. const
    " O8 [. X& |8 F/ n
  34.   eConsole                              = $00000000;8 a& W; t3 _6 `0 v
  35.   eMultimedia                           = $00000001;
    ( `# M+ ~6 }# R9 w
  36.   eCommunications                       = $00000002;
    . T& C, {+ B  M  T% j) s
  37.   ERole_enum_count                      = $00000003;
    $ p3 k; j! I' ]8 O# [3 B! E4 a  p
  38. ! [$ G2 p! o1 b5 o& a
  39. type
    ( }' {/ n) [1 c: K# D/ m
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    ; i7 [2 e' X: b7 ?" m- E
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']7 j$ J8 D$ F2 c5 H2 ^4 M* u6 d* r9 q
  42.   end;6 H! O% U! c% s1 @# i! P
  43. ( y. k. g9 h. ]' ]3 R; B9 C( D- Z
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    2 A8 V  ], ~6 D3 Q% L4 x5 N, v3 i
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']& y8 p# Z, E+ h; N1 `- {8 P' Y
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    , N4 ]5 b% I: ~/ p; o) X
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;" |8 y% ?( F3 n' Q; j/ p$ A
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;4 ], t; N1 t6 p, b
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    & y, m" F8 s$ K
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    / I! [  j" |  b, \7 i( B  P
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    3 O9 }, ~9 c( Z* C9 i
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    , ^5 _! i$ g  }: ]  F0 P
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    : h# A4 q8 O" q8 Z& G: _
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;3 r5 S% M( }/ C. T" C- \
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    & b* f* N1 V- k( c/ K- m+ F
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;" S6 n1 ~+ ^& [$ H
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
      m! j' u: l, f
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    - M. g' @- {5 t1 L
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;4 b, _+ p$ @% W' f$ M9 g/ e: f" k
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;  S3 Z4 H! O$ Q9 |$ I
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;9 _5 ?0 C, x! `
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;* I! y" @, ?7 F  f' A
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;% g4 s8 Y0 ^" U
  64.   end;
    8 ^6 M& s1 N9 Q7 V  r( h6 ~
  65. ) g4 @* Y3 ]9 E& q& z4 F- Q3 D( h
  66. {  IAudioMeterInformation = interface(IUnknown), y5 O. b0 H4 D0 |0 w
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    , ~" r# a" Y7 u1 g
  68.   end;}
    6 t! T0 D0 @5 l) O- B1 S
  69. 8 o; {* L# ?* O
  70.   IPropertyStore = interface(IUnknown)  @; C. d2 l1 ?/ y
  71.   end;
      i: H2 z# s7 O& U
  72. : ^0 t  Y8 N8 K5 s1 `
  73. type
    5 Q( r$ A: y: O. F8 e0 i4 ]
  74.   IMMDevice = interface(IUnknown)
    7 h: C+ f. I7 m) Y6 c7 B. \
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    6 V3 P7 q/ U- M( R- U7 o8 w8 o
  76.     Function Activate(  refId :TGUID;
    ; j0 @+ N' {5 `8 L" m; r
  77.                         dwClsCtx: DWORD;9 [1 c' @1 w4 d7 h6 I0 v
  78.                         pActivationParams: PInteger ;4 _0 d) ?0 A1 X# x6 S/ U
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    0 l+ a2 K4 L1 \) t
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;$ _: x5 T7 |& s+ q* d; c2 o
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;3 `, k1 N" T, O, J8 h! [
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    5 U$ z3 `/ u* y3 A- }4 O1 U+ \

  83. 5 f" ~) \; X/ ~+ F% x0 F; E: B8 ~
  84.   end;
    : t6 D- [8 q6 k$ G

  85. ! G- T7 C& f. E: ]# I

  86. 2 z0 T* [  i- i$ o/ |
  87.   IMMDeviceCollection = interface(IUnknown)7 Q/ x$ K3 c* J% W4 S4 y1 a
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    6 ^3 A  X' o8 d- ^7 M
  89.   end;) T# e- S: K$ X$ e$ d6 Q) ^, v! E
  90. ' V- j$ C' I, A. C& ]2 g
  91.   IMMNotificationClient = interface (IUnknown)
    ! N3 X8 s: [0 }2 ?8 {/ k
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    * s. o; }* E' A6 w! G5 D
  93.   end;
    8 I/ r, G  N- M

  94. 1 `: ]4 d0 I- r" u# T4 B
  95.   IMMDeviceEnumerator = interface(IUnknown); C' i3 j' ]6 m& K1 a6 }
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']2 E, x5 I0 Z9 I: x  @
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    . z! f3 ^- c$ U. c8 k
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;% G# y, P9 n$ e8 _: k5 O
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;+ e" z) G- G; ^+ ?* S1 z! U; @
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    & V  J4 m2 r$ g' N9 i+ J  E( |. q
  101.   end;
    5 T- K1 ^* q: z. ]" a7 {. X! \/ L

  102. 6 E% z/ Y' L1 N4 R& P
  103.   implementation) v( m( m) Q( U* n( n* q
  104. end.
    % d5 _+ `3 s  r; K) A

  105. ; O( b$ q2 L7 U/ _4 G! h
  106. Thanks & Reagrds,
    ( t. x- J) G$ j. C& z; s& H
  107. Mukta ...& E+ U6 h7 ^- p* b5 }
复制代码

  1. - _5 ]0 N( @& e! w
  2. it's work in Delphi 7* o4 B1 f) Z$ a
  3. //////////////////////////. Z7 ?$ F" o9 L

  4. ; _- Q. h& W, y/ D
  5. unit MMDevApi;* Q% M  I5 l5 A/ R8 d
  6. " w& C+ `1 J' U
  7. interface. }# _3 Z: s7 l/ W; y: }2 a

  8. " ]( H# Z5 N2 z( l/ w# Z% a5 t/ W
  9. uses
    ' v* ?6 u, A, ?' E5 Z
  10.   Windows, ActiveX, ComObj;: u& M( W$ l: x) R

  11. 1 C' _. p* I2 W( P
  12. const1 D0 s! B/ f/ o( k9 `  \
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';$ u; o7 Z3 |5 S  R+ k
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    " o. @8 k! C: d/ u6 X
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';% O* K. n9 o& m* y
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ' C# X& S# n& E8 X, d0 \
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';2 E. h, P& T8 R
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';% @" l9 H; k9 j' ?9 g8 @
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    + e/ V# a- L! m+ }

  20. 3 r" p& y. n: v6 `  J! m
  21.   DEVICE_STATE_ACTIVE                   = $00000001;& q9 A+ Q8 y) r1 [, t. f: F
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;. i- o5 v* O+ T* K) E" i/ Z
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;% v/ J- W% f# ]0 j4 N
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    . \2 ?- `, b) N" D. ], s& r! @

  25. ' }! I. Z, Q9 Z7 O2 a
  26. type0 J4 o; o& O# H5 ?4 H, q- D
  27.   EDataFlow = TOleEnum;
    + Y. u* i3 _7 i$ ~- [
  28. & n8 J% |. M. w
  29. const
    ; u8 d2 G. t4 @9 P; r
  30.   eRender                               = $00000000;
    2 `" \2 p3 s, X2 i
  31.   eCapture                              = $00000001;
    " l' u% t7 _. e/ ?  h6 P
  32.   eAll                                  = $00000002;) D& H( D. i( c, x, F
  33.   EDataFlow_enum_count                  = $00000003;
    8 U  X# ]& p2 |/ t# @  A
  34. / c4 R  h) s8 l# h" i! M8 ~
  35. type
    1 |$ E5 L: y; v5 s" \! {1 S* [
  36.   ERole = TOleEnum;
    : h3 W- m6 u# m2 C, R; B8 q
  37. 7 _' u1 {  ?6 c- {) g
  38. const
    ) i. R, H6 g2 X- O$ B" G- H
  39.   eConsole                              = $00000000;
    - F& _! r6 P& I* H
  40.   eMultimedia                           = $00000001;) }3 B' x+ p, I4 P* `! {$ e# u
  41.   eCommunications                       = $00000002;9 M8 |* ?: j6 M+ ?7 Q
  42.   ERole_enum_count                      = $00000003;
    + Q+ o* W! m6 y* r

  43. 6 j9 D/ J( _9 O/ ^7 j4 X
  44. type& x5 k$ m8 z) t6 b& e
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    " O0 Q: Z6 E8 K0 M
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']: R4 b. d: W! t, o3 {* R: v
  47.   end;
    # {+ ^' g" N4 ^' k0 U6 L
  48. 8 x: N8 l' Y; ?) l
  49.   IAudioEndpointVolume = interface(IUnknown)" Y4 O1 x( [( e; I
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']7 f) x- V: j9 [+ F6 \$ m; u
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    1 t. t6 g% I: ]. j8 U/ L
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    0 C  J/ O6 U. P- V" z& R4 J
  53.     function GetChannelCount(out PInteger): Integer; stdcall;7 I" U# c6 G1 c8 f
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;5 c. ?; L( U& L& c5 _
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    3 e; d; c& ]" W' C
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    2 j) z/ ]" F, x- X- L( ]/ h
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;# A4 g; h% Q! U4 H' F0 z
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;$ \9 Q/ q# Y2 x1 e/ p, g$ e( y
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;' J+ C$ i9 Y  A' A( {, y* k
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;( Q+ E" K- t. R6 K3 ~  e8 z/ ?; d
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;2 C& E# Z" L) v: _+ h- Q" B
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;3 T/ M" ~; ?  r+ u( [# I0 c" S) j
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;' G3 z0 C) l4 q4 ]/ d4 H. q8 d
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;" \, a, y; ^; H+ R) ?* V
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    5 l6 N' m% Z6 n3 U! k
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    / M2 h' K- i5 [+ z6 F9 C( v+ f7 I
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;& J  b# L8 Z' T. v  m1 N
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    / Z5 S# l- p- e
  69.   end;9 j+ W4 l+ M% v7 _
  70. 8 y0 O5 \  R8 @7 `; ?$ H
  71.   IAudioMeterInformation = interface(IUnknown)
    8 w( y( C; w4 Y7 R( h' S
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    3 y0 I  @- Z" l, X0 p! N
  73.   end;
    : u6 h( o" G3 L  M5 O1 ]! f

  74. - ^/ T6 H% w8 R$ e! Y/ P9 h
  75.   IPropertyStore = interface(IUnknown)# @% O# d$ E* \8 y# L! J
  76.   end;
    4 M7 T4 x$ ~9 Q1 V

  77. 8 T5 w( j% K3 N$ s  z6 X
  78.   IMMDevice = interface(IUnknown)
    4 A/ a/ n: [3 M  j" I
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    & [! K# f4 k  Y1 m# h) O
  80.     function Activate(const refId: TGUID;
    2 G  E8 x) n0 Q
  81.                       dwClsCtx: DWORD;( M5 ]2 s# S* k; G: z0 Q
  82.                       pActivationParams: PInteger;- i$ N9 K, N: w+ Y7 p6 {
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;: U+ U$ V* E; V, W
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;% q! Z4 f; g5 M/ m0 o
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    7 {0 t. Q" ~- x- g1 e3 b+ V
  86.     function GetState(out State: Integer): Hresult; stdcall;
    2 o2 i& L9 k# M( t- |
  87.   end;
    , d2 p# d3 D- M5 w3 o
  88.   s& d* b) V4 G. N& b
  89. % t5 w; Q# @- ^, s7 S+ q5 M  i# {5 n
  90.   IMMDeviceCollection = interface(IUnknown)
    + ?% n. I9 T% l5 `' {" |# w1 O! q
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']- @( [. R/ l* w* H' c
  92.   end;
    9 |, ]; Q' k! O/ r' e
  93. : F+ F9 [+ b/ G+ c3 |
  94.   IMMNotificationClient = interface(IUnknown)+ ~6 U3 u4 Q# J
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    3 p* B. }" o/ w8 [
  96.   end;
    0 }2 ]5 y: _% w7 _

  97. # z( Q  P' q% f$ Z( ?+ c
  98.   IMMDeviceEnumerator = interface(IUnknown)$ j, l% h! G" R8 x4 v& e# }
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    - w# t8 @' c  o" T1 c: Q$ {
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;+ k1 D0 y" x+ d; H- d. V. l
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    8 W- G+ y% e: F: U% E
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    + J) i2 _4 I/ }5 q
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    & L; Z" Y0 i% ~/ h+ N1 a
  104.   end;4 _5 M% X/ m$ {5 q0 J

  105. 9 a( B" @+ p+ F4 l' e
  106. implementation
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  107. 2 O' |, h: Q1 w- Z
  108. end.
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  109.   d. t" h6 @- O) a! P2 `# ^1 T( q, M
  110. ///////////////////////
    7 _) u* ]! E" A0 D+ M8 w1 J& Z
  111. simple sample :)( f+ g2 F! p, W9 z5 K6 x* X+ i! h
  112. ///////////////////////
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  113. 7 ?4 M9 d9 m3 W& C. l0 Y
  114. //...... other code
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  115. 9 @! C. F1 d7 W9 w3 C
  116. uses ... ActiveX, MMDevApi, ...;/ q5 x- Y9 u9 C# v
  117. ( g! f7 u2 y/ M. _; r& I
  118. //...... other code
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  119.   W2 D! B  X0 v$ a
  120. var
    ; `- R/ H0 ^2 v8 ^4 a, D' T) {' W
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. ! d" a) i2 x4 N+ z4 G# s8 n
  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: I8 @* p% U6 v5 S" ]
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);0 Q- S+ W8 C) Z
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
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  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
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  131. end;
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  132. * b+ m# {2 b* p7 v% A
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var: _8 s; }9 c. _3 O$ ^2 {
  135.   VolumeLevel: Single;6 l7 J% v  A( F4 Q  t
  136. begin
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  137.   if endpointVolume = nil then Exit;; c& b7 m6 g4 C% S. Z$ S2 q& [3 R
  138.   VolumeLevel := 0.50;) _, _0 A' z  ~, E! t
  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.   V: u+ \+ P9 H$ R. ~& q  O/ G; ]- m) d
  143. /////////////////////////////////////% i- L: v& _7 g) E
  144. 8 _, I" r8 z# K# t- W1 ~  Y
  145. // with best regards ToxicDream
    / ?" Y6 W0 ]3 {) U% ?1 P
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