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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-a8c9-2e27eb9ec0583 O3 Z9 H3 x. `* T4 U! h! g
By Mukta & ToxicDream
  1. . q1 [3 h) H) }+ W5 j/ `
  2. //for delphi 57 c( W; R& n+ r5 {& b- A
  3. unit MMDevApi_tlb;+ n# P' s- K1 z8 u: _1 g

  4. , S" P+ S- g+ {0 K0 c2 s9 s
  5. interface  g& }0 x2 c9 J5 V8 j# n- Q  W
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;! p/ |7 c2 m0 X% S, z
  7. const
    8 q0 z$ |* v$ D2 P# i
  8.   // TypeLibrary Major and minor versions: B. I* s- `' p) w4 @; p; K

  9. / c2 s# q7 N+ ?' Y) Y& ^8 \4 d, G
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    7 C1 {. D8 S3 Z/ @: Z  F
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';6 R3 K# A$ l" D+ W( m! Z: J
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';2 m8 e0 |' n- p% c. Q
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    8 l4 Z/ ]) J$ `) \
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    & `7 Z* R# J2 p8 y6 ?2 ~. ?) Q
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';* J' c( o$ Q% v( y: L
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';2 C' Y- u: a& _; Z

  17. 8 h# Y, N2 @9 J& {# U
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
      O9 J0 K: h2 ^$ r# H8 u
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;* K6 k8 r/ @: y
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    : R0 v7 \" G" k$ |9 J! O' V
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    , v3 y' C& K1 E9 R! ?) J

  22. # a. n8 s; Q: X) i9 d7 d5 [
  23. type9 C& j! D6 ^0 G- M1 z/ Q
  24.   EDataFlow = TOleEnum;
    + F, n0 O, h) J; u
  25. const
    % i& M) ~7 Y  P
  26.   eRender                               = $00000000;
    7 J, ]- [  v" _3 V+ I# h8 g
  27.   eCapture                              = $00000001;# l2 B. T$ Z5 h9 H0 F* B" P/ p
  28.   eAll                                  = $00000002;, ^& b' \3 ~% q" A0 k
  29.   EDataFlow_enum_count                  = $00000003;
    0 [% F+ o, r% w) [; M1 S

  30. - q# N. p9 g0 n' {9 C
  31. type
    # G3 E- m5 E; {7 O1 s* Z
  32.   ERole = TOleEnum;' @; H0 u, u* o9 M* r
  33. const' Y7 n: g( N9 c4 z' h
  34.   eConsole                              = $00000000;
    7 J$ m' J4 E0 u2 ^  c& @8 m
  35.   eMultimedia                           = $00000001;
    + n9 I* o) p0 P7 ?
  36.   eCommunications                       = $00000002;/ f, q' Y! Q- C# t. T$ }, }( @
  37.   ERole_enum_count                      = $00000003;
    8 _4 X8 C! x  d$ e0 Q1 n

  38. 0 W8 q# i# t' O/ J% \
  39. type* C) s( N  }  g( p
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    * F) b% h5 g0 y5 a/ m5 c
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']9 Z7 w. H. R  u% g/ f) x9 `
  42.   end;
      k& ^0 m0 D7 w1 Y! r2 K2 s

  43. : J7 m7 s8 e: b) u+ ?
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    ! U2 q# o  b- v+ ]5 m
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    % I% J: O4 t1 a) H
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    + b: l; ^9 C- m0 O2 I
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;& a$ C( W  @/ X0 n  d
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    ( P; n5 O! X, @/ s
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;" A: C% R4 M/ L. h) m( ?6 a2 W
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;5 h, J8 S; p$ M% ~: d9 f$ g$ J
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;5 i) ]; u2 F. t1 U' ~* p
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    ' H  ?! I+ d$ I$ e7 q6 g% o' E
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    2 X) G7 E$ j! u$ ^) x5 M7 U
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;& `2 Z0 m* z. M) v
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    9 m4 @" I' m: }8 H" q, w* d7 \
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    $ o: c$ e6 c& _1 c  @% Y& [
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;: g, t' t' `6 L( F( o: H
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;- N2 ~9 d& ^* D+ c4 C
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;. w9 z' C: q3 f3 U" @/ L
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    ) w/ ~6 t; x; i$ ^
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;2 a+ K# o6 O% K  ^
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    ! e1 u9 t8 K6 ^. Z! a5 I: o+ E. Y
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    # A9 P  f2 b8 I
  64.   end;
    ; O6 Z) G1 A( [' `: U# j" ]
  65. / q+ G- u& |. \7 c, V5 E4 y) f
  66. {  IAudioMeterInformation = interface(IUnknown)
    # h9 r( h7 q4 Y6 E" ?" S
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']3 J) g0 U+ x& D) \
  68.   end;}0 p7 P* G  t& i

  69. * D0 W4 K+ P6 `2 ~- d( x/ _* x
  70.   IPropertyStore = interface(IUnknown)
    - _& s3 }# D' Z8 t3 Q4 w
  71.   end;0 Q0 F( @% A5 W

  72. 0 A) m) j# ~* f: H8 A
  73. type
    " p( V. x. F* o! a! k
  74.   IMMDevice = interface(IUnknown)6 D6 n, u" W" m7 s3 p% \0 U
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    6 t: U, C2 M( r  ]' X
  76.     Function Activate(  refId :TGUID;4 G6 @; c+ F6 r; J' x
  77.                         dwClsCtx: DWORD;
    ! U$ u# H/ z8 M; x4 K" I
  78.                         pActivationParams: PInteger ;& l  h% r$ ^* A: L9 c7 k( u# }
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    5 N. A* x& |  |, g# D# U# M8 E/ n
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;% u$ e7 V' R5 G. T1 f4 ]# ^
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;8 J2 ^9 D1 d1 E+ @1 `; S( c
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    ' i  P5 d" Z1 @5 E6 e( M5 {
  83. 8 N2 b4 ]$ U/ r4 E  M' l
  84.   end;7 A. e+ c" _0 N

  85. 3 Z$ R* v* }9 M0 U
  86. 4 a8 y* k& j6 o7 a( ?8 ]
  87.   IMMDeviceCollection = interface(IUnknown)* T1 ]0 |( h5 S9 e6 j
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']9 d* r. H( N$ K. g
  89.   end;
    7 f$ H; [/ ?; u7 G2 h# B

  90. 2 Y: E4 b: S# a4 ^) k; e1 e
  91.   IMMNotificationClient = interface (IUnknown)7 d- R! U& x+ @5 W- v
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']3 M! M, P1 q& x9 C4 \
  93.   end;) z% a. m0 O3 H; t: Y7 j6 Z

  94. 0 T5 \! D0 m: g  d+ c1 g* x- Q+ q0 m7 Z
  95.   IMMDeviceEnumerator = interface(IUnknown)
    / \! m1 ]$ Q3 e: k& j, \
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    / w. N* M( l; b5 |3 k6 i& o7 d2 X9 c
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    * J% e6 o/ ^2 n! W+ m& l! R
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    + O, [+ z; X. i% ~* u
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    9 `& b0 E2 L1 _5 T( u
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    0 {0 _( l- Z7 N
  101.   end;) N: W+ [7 E# ^  d) [8 A& C
  102. . r: \6 B' g; k. ~
  103.   implementation
      Y- K% x0 Z! O& I$ X  s
  104. end.
    5 u5 M3 i* X# p: w& H
  105. + c# Z6 }1 ]; }, R9 s) y$ U3 d$ Y
  106. Thanks & Reagrds,
    + p8 q. G& V0 f% a: u: d. K2 X; F  Y
  107. Mukta ...
    1 y/ K" h" V4 f$ T: C# z
复制代码
  1. 4 C# t' a7 v0 b6 b/ Y2 @* a
  2. it's work in Delphi 7. J5 [" R8 I2 @$ A$ D
  3. //////////////////////////" y4 X! C. r( @* h7 `( n. x

  4. # a5 s9 s) L5 m3 O5 y
  5. unit MMDevApi;) M; Y  y9 K9 o7 T
  6. # P5 T: `9 _3 M  s  n* c. \2 f& T3 H+ N
  7. interface# ?: T3 \4 X3 P. d, T9 t% O

  8. 8 j0 }$ x( w2 @
  9. uses) V# [0 R" j9 D
  10.   Windows, ActiveX, ComObj;2 j( `3 E" c  v) d

  11. 0 J$ ^  H! a* H% g
  12. const
    , }6 Z; A% H9 A; o! z! i9 U
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    8 Q7 `1 F1 A: ?+ K
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    " R5 L1 ~, {) d3 o' H- T
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';6 P5 r) p) d$ B' @! r, T
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';: `$ n1 Z& p9 b5 @) Y1 _
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    : h2 `. \- I, K- V' H8 V
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    , d$ a( e: w: I* `
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    ( I8 m6 o% M! f0 B1 W6 ?- K
  20. * B0 u7 O0 ?' d2 B9 g! I0 b6 V% l+ E$ g% P
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    , B% D; n9 ?/ K) u' p/ c/ w. y
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;8 \! I0 M; U0 r9 ~( h1 f
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;" q' f6 B8 s: [' D$ o2 V. R) k$ R
  24.   DEVICE_STATEMASK_ALL                  = $00000007;1 P  r& w& w' E/ |, S2 N' L4 D* t

  25. 3 c; _' f/ L3 h/ S
  26. type: g! K5 r9 l- @$ I
  27.   EDataFlow = TOleEnum;
    4 G/ X  Z) G% [' J, {% {) {
  28. : ^/ Q5 Z: B7 N' K
  29. const0 ~& m/ c: j! R
  30.   eRender                               = $00000000;& p6 E* l, q& H/ o, t
  31.   eCapture                              = $00000001;# d, Q- ^/ k6 P) @  i6 I& h- b
  32.   eAll                                  = $00000002;
    ) n' a5 K* D1 a/ {2 \9 q6 V
  33.   EDataFlow_enum_count                  = $00000003;4 _- k/ E2 W- e" e6 H, ?$ n
  34. . T8 j8 \" |2 v" n# }3 k( w8 p3 [
  35. type
    - o9 i3 P* a0 n
  36.   ERole = TOleEnum;
    ; _. m2 P+ z3 x; G2 F3 J
  37. 3 w. D" d3 [  Z
  38. const$ {0 X5 l! V; k
  39.   eConsole                              = $00000000;
    : O0 F1 n; y" x) e
  40.   eMultimedia                           = $00000001;8 x! s2 w, f) R$ n
  41.   eCommunications                       = $00000002;
    : y2 o2 j, v/ t2 d, G; S
  42.   ERole_enum_count                      = $00000003;
    ' w4 ~' f, q8 I9 M4 p, j; M

  43. , q; c# s; j& g8 n
  44. type
    % ~# c6 I' G: _: ]) a/ P
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    % M8 }+ Y) a4 D% N3 [/ @
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    $ k0 R. e# W" L  s2 q- Y
  47.   end;( k2 l* W# D% ]% g3 k
  48. 4 ?! c" h- {* _" J4 ?
  49.   IAudioEndpointVolume = interface(IUnknown)
    % W0 Z) {. h# `1 u% b
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']0 s( ^6 ]! @! w& v3 V  i
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    0 d3 F$ o6 z+ x% a1 `& `" B/ P5 x! b
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    $ D( U% u/ r* |6 A
  53.     function GetChannelCount(out PInteger): Integer; stdcall;7 j+ M" K/ P0 Q5 M- }- R
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    * m* J  s& ?. ?
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;% r6 _9 s# v$ }; U  `
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    - K+ ?* k3 r. ]$ O- }8 f* _8 q
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;9 |  Q  O& Q( W( j9 {/ g. F/ r
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    4 i* x- T; C% P$ v& }& T
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    9 f- }* n6 H5 C  X3 n
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    : k: p9 b5 G. ?: e1 w
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;4 q. X% R) k7 Z3 Z) L% A+ V
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;0 v2 B. I4 U/ H# _, w" `; _+ w( P
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    7 j4 N' [  j" T4 u; n# D
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;' u. O) L, E# u
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    : a5 j2 |8 a' ]9 c4 K3 p& ?" `
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;' Y: m# Z8 u; w- z( T
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;9 d) A" |" @! y6 q4 t4 M* v" x" m" M
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    7 w( }1 `" j1 U7 S) @! {' E& j4 u
  69.   end;
    4 i" }7 n4 g# |) J2 b$ Y+ J# c1 v* f

  70. ' t& p3 ]. y9 F1 C, Q3 t6 F
  71.   IAudioMeterInformation = interface(IUnknown)
    ' r4 ?8 C; J6 \* V: M
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    3 y( T! n- H0 o
  73.   end;* b2 @/ w+ L* K
  74. , _! V# |+ X! D% _. \% O6 N& |
  75.   IPropertyStore = interface(IUnknown)
    , [" \& I4 w# K& u- ~
  76.   end;
    + Q, h, a* s) ]' s
  77. : E: u2 ?$ k' w! m' i, L/ ^
  78.   IMMDevice = interface(IUnknown)* h4 o6 f' b) \: m9 S$ R
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']$ S$ d' M1 E6 s- _4 {
  80.     function Activate(const refId: TGUID;
    " b2 l6 o/ c( t7 U/ j" o
  81.                       dwClsCtx: DWORD;) x; h* |" z. q+ e1 U
  82.                       pActivationParams: PInteger;6 v$ {/ d+ O0 U8 G) f* V
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;+ F5 t# |, z  B+ g" q" P% S
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    ' N3 P, N- g+ f+ s" Y5 E- J
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;* e  e& T& s  E- D$ l
  86.     function GetState(out State: Integer): Hresult; stdcall;
    4 x5 v! S1 j4 }& [
  87.   end;
      |8 z; @# r2 T7 `& e
  88. 4 o0 `1 c7 F" f5 T0 z9 X" e' Z
  89. ! {2 D4 f" u: T
  90.   IMMDeviceCollection = interface(IUnknown)
    8 }3 J( }8 \$ J7 j; G
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']( x9 V9 }6 b# I% ]. n+ c& W7 M
  92.   end;& Y" r! p  B! C+ u

  93. ) L" |! o0 M5 Q! h# p9 t, b
  94.   IMMNotificationClient = interface(IUnknown): X' p3 E  w0 R7 m2 i- a( r& t
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    4 B: d8 G$ Z# k! J9 c( |1 M# S
  96.   end;/ e; W" I1 w3 s6 U1 S

  97. 6 e) ]; @: @9 s  c3 Q0 y# @
  98.   IMMDeviceEnumerator = interface(IUnknown), K" S: b' g  j& n" \4 [
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    + y+ ^! Y) A, e- \% R% g
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    0 Z. r9 P+ w; _) G/ d% W7 E
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;7 h4 p9 x9 k$ M0 p7 @
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    ; K% _- u1 k$ L. P% \" Y
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    - n& W3 \. S. P- \
  104.   end;  Z' I& P" ?! _5 W1 g7 R; h- n
  105. % o- b: ^. [  h. h5 P1 `' V
  106. implementation' x7 V4 G2 `9 b
  107. 4 ~+ p0 e. F! ^; F
  108. end.
    - u2 l$ A8 d" [1 Z( r
  109. - J' |: [4 e$ L5 a4 M
  110. ///////////////////////
    : k0 P- {# L% {/ J6 t/ m
  111. simple sample :)9 c' h) i4 G* H  ~. C( r
  112. ///////////////////////
    * M# V3 t; I- Z; y8 x1 b. H
  113. % _  Z8 v( R. D) G, D0 G: X" }* B
  114. //...... other code
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  115. + J4 _1 c2 T, B3 w1 P
  116. uses ... ActiveX, MMDevApi, ...;- F, [, p# p8 `- L

  117. # r! }* k# h9 _
  118. //...... other code
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  119. % r: n# M9 M( o+ G4 Y# V: F& b
  120. var
    5 J+ M( E1 Y+ C2 o
  121.   endpointVolume: IAudioEndpointVolume = nil;
    5 x4 i1 L4 f! \+ g
  122. & E' l4 x: e* B9 x& ?
  123. procedure TForm1.FormCreate(Sender: TObject);3 ~1 a: c: w2 ]& W5 `8 d. N
  124. var* I* T) {& n2 D4 }% w  J% k. T
  125.   deviceEnumerator: IMMDeviceEnumerator;8 _) t1 |  k, w2 V$ t& K
  126.   defaultDevice: IMMDevice;: z/ s& q2 b5 u6 a1 Z+ H
  127. begin+ L0 I! r) X* q+ [7 m
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);8 r5 W# D9 o5 ~( f$ W+ ~0 P& M9 ^
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);) y; d+ P: w$ {$ z; B
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);8 A0 {6 W* V4 o6 z2 X
  131. end;# q% H- z. c4 M' S& s
  132. , ^+ R9 j# H, Y3 K& W  f
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var4 C  f' O' N% n
  135.   VolumeLevel: Single;' c7 V' U- \) j! J/ N. L& y' `
  136. begin
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  137.   if endpointVolume = nil then Exit;9 H1 _# s, q- K% p, h! G
  138.   VolumeLevel := 0.50;  O' g( w+ Q: ~( U1 K$ W
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    4 a+ y' f6 l- A2 r  R1 d+ d4 y
  140.   Caption := Format('%1.8f', [VolumeLevel]), i' U6 K) U) C( g( Z
  141. end;/ C0 t4 }0 {# g$ Q" v
  142.   d, T& v$ |1 Y( B; j- q
  143. /////////////////////////////////////
    & ^5 ?" {4 ^# X* r9 n. o* S& m( s
  144. / g; V( ?6 }9 B5 N. N2 i$ x* x
  145. // with best regards ToxicDream* W  w8 Y* W  v* B1 O" }
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