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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 b! C2 Y' i6 P/ k0 v
By Mukta & ToxicDream
  1. ' T" n# K/ t* q4 [: g$ Q
  2. //for delphi 5
    ' _1 u& B1 |8 |6 ^* N
  3. unit MMDevApi_tlb;, j* ~+ r+ i2 n# `5 Z

  4. . w3 J4 {; [  f4 k+ E1 y
  5. interface
    : `- Q7 i' q' d$ A
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    1 A2 \) W( }2 p% b
  7. const
    ( t' Z* a/ M# a
  8.   // TypeLibrary Major and minor versions0 P5 W+ ?0 F! t& K' H! a

  9. - u0 _! ~$ ^0 n6 ~( f( O
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';. D5 T1 K! t9 M
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ! ]# g8 L3 }7 J3 J; X3 R- \
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    " C5 l1 ?& n( X4 A# P
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    1 U/ P% d8 t! w& f) P2 d+ r& w
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    4 @8 B: r& _0 w5 Q
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';5 }2 U4 j% Z  ]) q  Q* @
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    5 X" b  S& n& f

  17. $ D6 C* g9 Q7 h5 m( A. D4 q" g5 I
  18.   DEVICE_STATE_ACTIVE                   = $00000001;0 k; [+ A# H1 V1 B7 u" S) S
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;; a( S5 ]) C. w; ^$ f
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    / Y$ g# V: P% Q" N7 c
  21.   DEVICE_STATEMASK_ALL                  = $00000007;7 w; k$ H, @/ g! |' G% L" f

  22. ( Z: `. M  W6 P! r' E& ~. J
  23. type
    " L+ Q1 F: Z- f! {1 ]; o
  24.   EDataFlow = TOleEnum;
    $ R* b( Q  f- |& K
  25. const
    1 h5 D+ w% D# E+ |* s+ e6 V/ f
  26.   eRender                               = $00000000;4 g& f# `4 R% F& |' c
  27.   eCapture                              = $00000001;3 u& D( m: c1 I+ `
  28.   eAll                                  = $00000002;
    9 p5 _7 ]- n, {' q! ~0 c" _9 p
  29.   EDataFlow_enum_count                  = $00000003;
    1 C: n' b5 {( g* A! z& W, U1 M
  30.   @! `. r2 b2 J" J# V
  31. type, h1 i) h2 n% m0 ?: |
  32.   ERole = TOleEnum;3 ~; t' ?1 X: F" E0 ]- }
  33. const& d. P3 W7 N' V: I1 c& k* s7 u
  34.   eConsole                              = $00000000;
      {; ~% E. ]& Y, s( \
  35.   eMultimedia                           = $00000001;
    8 }' @+ U4 h" p+ V3 L* g6 U1 t7 H
  36.   eCommunications                       = $00000002;7 Q6 I- i% x9 W
  37.   ERole_enum_count                      = $00000003;
    9 F9 G8 R7 {! w; f
  38. 8 b, I/ Z9 S5 N2 u0 I$ _
  39. type
    % H3 d% Z; p+ d# g7 ]
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)) b7 H2 S, `7 K" R& t4 t1 Y
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']' O, e% a' E9 B
  42.   end;# b0 `! ?& l8 f% _0 \1 E
  43. 1 L' q9 c8 I3 k0 H7 V: r) f
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    6 K( J5 {. F4 d$ u; K* M" i, [" W
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    6 ~: v3 {( N, P0 {$ Z
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    3 x$ ~7 J) W# e8 a
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;5 G& \; R9 y) f
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;! s5 n3 _' R% C9 Z/ I. P5 H
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;$ N* g/ T( Z5 D# p9 j/ B& B# O
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;& s/ u8 y  \+ Q9 p" {
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;' w% b9 z3 W& }) x
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;) E- l7 _" |, H- P% ^
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
      d1 w$ g9 W9 y2 T3 }
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    * |3 Q6 Q  `" @, f, A3 u0 H
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    ! O, G1 x" n) @% b: Y
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;/ m1 x  q3 j! D  ^
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    , J& W( g9 S; V$ F6 k9 R
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    2 A- V: [) V( u
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;4 ]- h# {# `; r9 E, g% s1 k
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    9 s9 Y+ d( ]0 I" h2 I$ {
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;6 q2 Q- M! j5 R- y
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    & W- ?3 S) B1 ]$ F  B/ c, V" \
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    6 `( v3 L9 N: M' t  \% A6 w
  64.   end;
    8 P( i% V" J7 b. g. J$ e6 O( q7 {
  65. " e8 \2 z" `' M9 L0 }; b* o2 c
  66. {  IAudioMeterInformation = interface(IUnknown)' ?& }3 o  `2 h. C" L! S
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']7 z5 r0 R7 `- t- d: Q$ {
  68.   end;}
    ; l1 y4 ?  O# y& U" I
  69. , P1 F3 a+ c6 b2 b! o3 b4 v
  70.   IPropertyStore = interface(IUnknown): @4 `$ Q# v3 J! }# A& `
  71.   end;
    9 q' b2 `% s. F% ?: y6 T$ w! }: |
  72. 2 G; v& v- P1 S
  73. type
    ) t2 }, p  O" r2 f9 E
  74.   IMMDevice = interface(IUnknown)  t2 b+ u& u7 T! Z7 L. \9 a
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']  G3 }# V& E" d% h; G
  76.     Function Activate(  refId :TGUID;9 \9 Q- B2 U# f5 \9 B
  77.                         dwClsCtx: DWORD;
    & B. _1 [5 s$ C. C; N% s. s. D! D
  78.                         pActivationParams: PInteger ;
    $ b+ p3 M, ?. _1 ~% `0 Y' H. D
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;% f0 ?, j5 t$ m+ i
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;5 n- z6 w& s- E: e0 a
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    # |! j5 ^: J' p3 F$ c
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    ; H* K, N4 w. z. t+ M
  83. - Y8 h% E# ]3 Z1 d& i3 M1 A$ n
  84.   end;
    1 E" G4 Z# J3 b+ z8 j& S4 v

  85. 8 |' [* Z" o/ x3 Z- x, v, M& P' b
  86. 4 n5 V2 ~# \& q/ n( i3 T2 Y
  87.   IMMDeviceCollection = interface(IUnknown)5 G$ l/ v, y& K% x% y/ s  g- c
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    * L0 R5 {  {" Y; ?: R2 r, o" s
  89.   end;% R$ w1 \% Q. a' {9 F! O

  90. 4 F  P6 G2 O' q& p. ]% `0 t
  91.   IMMNotificationClient = interface (IUnknown)
    7 N7 v% B% @; K9 l: \5 _
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']6 d8 Z) c6 _" T# c. R$ ^: a- Q
  93.   end;' i# P/ O/ q  j- h; S0 F5 v$ C
  94. 5 _0 |9 F) @  }! F* `  V
  95.   IMMDeviceEnumerator = interface(IUnknown)& ~# c5 J  o# [* Z# U
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']& d, d; k: t* O/ c0 `
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;1 f# z& i  K# c; _6 @9 n6 u  E6 F0 R) |
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;; o$ D+ N( X' `7 w; Q1 R
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;# c1 l. F% i" C4 ]" s- z
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    9 x4 G  K+ s6 g* s
  101.   end;
    $ ~( M+ x4 K/ o. k" g  g+ {
  102. ( u* S5 O- N6 w
  103.   implementation% m% V3 T6 A6 q4 R; Q9 K! R& i
  104. end.
    ; Y3 R) y8 F5 e! D. N

  105. , L) V, Q/ _0 M$ T& d- w
  106. Thanks & Reagrds,/ z- ~( T+ u$ O% J4 ]
  107. Mukta .... X1 h" f; Z* z# K; J/ T1 M5 G
复制代码
  1. ; B# `" [, i) ^- X# a0 \4 c
  2. it's work in Delphi 7' n1 X" j' y, F. }. P3 p% g
  3. //////////////////////////
    4 P8 d7 J  o. t/ k% @% k

  4. 9 e7 f, B! }* w3 K# Y0 ~
  5. unit MMDevApi;
      O' ~- j& u; U0 a8 r+ `

  6. 1 ^) ^" O8 V7 B$ X: p- k$ u% j& K
  7. interface! n/ g* @' e: n' e) f) a
  8. + v6 |9 J0 e3 k( P
  9. uses
    % H0 T+ C& ?/ t- R$ W, M
  10.   Windows, ActiveX, ComObj;( Y3 {' t$ x1 L) n/ c9 ~1 ^

  11. 8 F0 q: }0 E, A
  12. const
    . B( @; j: T! e9 g" x
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';1 o) R& O7 p8 X+ H$ B
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';# X$ t" B" a" G6 e5 g+ P6 Q
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';% H3 d$ P4 G$ l6 [$ v4 v. O
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';( i# W' T# R) F9 X5 a% U
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';' S  M7 B& I$ s* f1 t
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    9 [- k. e4 ^. Z, P+ y
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
      j+ Y0 l6 p- R( E2 h$ a
  20. 1 k, n9 Y2 k/ M2 [" p$ W4 y
  21.   DEVICE_STATE_ACTIVE                   = $00000001;9 N  o/ }6 M2 V3 j, Y1 W- n
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    4 V$ P; ?4 P( I9 b8 {4 P+ u& j
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;9 M6 i/ ^, N7 G1 y& Y7 d
  24.   DEVICE_STATEMASK_ALL                  = $00000007;5 |$ Y1 ~- b- O5 P" V- j) u

  25. + j) Z. E9 g) [5 d, O
  26. type
    6 z( A; ~( N% t' S- W+ j7 z
  27.   EDataFlow = TOleEnum;: d4 |  X, y8 R$ F# b

  28. * b; ^7 o2 v* m0 ~
  29. const" e. L( D, E4 D# {; Q; ^
  30.   eRender                               = $00000000;
    2 `. u# v4 b. O: T3 H- \
  31.   eCapture                              = $00000001;2 V5 {/ v# J& R* u7 O0 J
  32.   eAll                                  = $00000002;0 P5 `* k# N8 D" }
  33.   EDataFlow_enum_count                  = $00000003;
    0 R+ I1 p) k2 a0 V2 p* }, T

  34. , r* w2 S* x2 t! f
  35. type
    0 N8 d+ E% z' d7 I' l" c
  36.   ERole = TOleEnum;+ _( m7 k2 o3 W6 t* a2 r

  37. " }% u' b# e. {$ v3 Q! F  C
  38. const
    7 F9 G& K0 C0 Y, l8 q+ ~
  39.   eConsole                              = $00000000;. @8 n- D1 u+ b$ m4 I3 @
  40.   eMultimedia                           = $00000001;7 f7 x. E0 A) b8 S) s# ]4 S) V
  41.   eCommunications                       = $00000002;
    ! n; Y3 K3 F$ c1 o; a  T& R, {3 D
  42.   ERole_enum_count                      = $00000003;
    6 E5 E5 z/ h$ z+ I

  43. & Y3 n% F4 Y) {$ T7 Z8 J9 v) @
  44. type
    ; ~6 {( `2 m, f2 }
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)6 D( v2 q5 s  Q/ E8 g9 Y
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']2 Q1 F+ p( B* P
  47.   end;3 H/ v$ Q8 N! I) H5 Z- b

  48. % |- v5 p$ f% C0 }8 c+ p, h
  49.   IAudioEndpointVolume = interface(IUnknown)
    % x5 P. S3 e" u3 O: |
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']8 ^2 o: i. B% Q" v& m
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    + }" I+ p( {, m2 X# m% G0 {- N6 j3 |' h* ~
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
      A! `- z0 k2 j3 B
  53.     function GetChannelCount(out PInteger): Integer; stdcall;4 `% z" M% |( a( |
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;% T* u9 C# s9 N! Z" Y, V- h
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    , v* |  l" ?) z# h
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;, `/ ]# W8 n: O) f2 }& O3 T* t
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;$ B3 y& N/ u3 t0 V; s5 }' E8 s
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    4 u! l! X. ]$ q7 C  s! }: O
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;: S% t# w8 ?( `
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;3 D: v  B! ^; z* e  c. N* H
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;9 V& B7 b" {2 k+ L
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    9 r5 L! t  B# B, U2 M" ]
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    , s& p0 B" I6 ~- L" O* z
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    1 }! v7 @* |/ e  S4 o  K6 o+ g
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;( G; p  l9 t7 A% g, [4 N
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;, A; L6 j; p9 Q3 i
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    ; M& r% S7 f. a& h
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
      H, w4 e2 C' \& w- F5 E
  69.   end;
    * K6 x* Q- v; V& o8 L5 ~
  70. % D  T! U' _% E, d0 u
  71.   IAudioMeterInformation = interface(IUnknown)6 j5 H& ^8 b  K4 Q
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']2 }! B' T7 X* p6 X
  73.   end;
    % G* c4 K: d3 Y3 X, w0 v4 [" [
  74. ; c2 {8 f. [) K3 C6 g1 S2 g0 u) f
  75.   IPropertyStore = interface(IUnknown)
    # X4 {5 [9 K; w3 u
  76.   end;
    8 Y5 C: ]% J; G- ~
  77. ; x. T. }; t. e  x
  78.   IMMDevice = interface(IUnknown)
    5 H9 Y" Q& n7 u% t
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    - K9 C# Q8 ?, x. V- o! b, M5 s: g. j
  80.     function Activate(const refId: TGUID;
    6 H* |4 L  V6 Q* ?% q
  81.                       dwClsCtx: DWORD;, t  ^9 l  m4 r
  82.                       pActivationParams: PInteger;
    . n: @" O" q; z& `4 o
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;7 n  j, r0 L$ v
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    1 p( [7 b# q/ P$ m
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    % }3 ]: d' A$ V) R3 k0 _) l2 T
  86.     function GetState(out State: Integer): Hresult; stdcall;
    8 N) r% X1 }9 y0 z/ O8 _7 v, q$ q( |
  87.   end;* K( }+ u+ }& V3 |+ h# M. t

  88. - f( B$ k7 @: A, F5 U3 S% y$ H' s
  89. ; O2 k/ z6 Y# {# ^
  90.   IMMDeviceCollection = interface(IUnknown)5 D; k* D  n- s% P' ?0 ]
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    6 X/ p6 `# V9 ]# V. M' H; J9 i
  92.   end;6 J. }0 X9 C& P

  93. : q# _% e1 R! D: i% ?8 Q2 a
  94.   IMMNotificationClient = interface(IUnknown)
    : V0 q+ l$ _' W; U& t, |
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    3 @% z' b/ B6 l
  96.   end;
    # K7 t( @3 D" ?- N$ C$ }- x
  97. 3 F0 s! ~/ [: z# I
  98.   IMMDeviceEnumerator = interface(IUnknown): s2 J& f6 d/ v* w& e
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    / A7 h, h" ?; j8 w3 A4 o) W% Z% L
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    % e" [; O3 Q% M& L% y
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    3 h, _% A: P" v$ {. _% o
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;7 B  {  k, R( V3 c4 E
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    * O6 m2 {0 V; ^
  104.   end;/ M, Z' q; r. o# `# W5 E3 v: \

  105. " V4 X6 b- O0 ]8 Q% A9 F. p
  106. implementation
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  107. 1 ^9 [* ]# X! E
  108. end.# }( t- h& s, ]. w: N+ p

  109. : \' e6 S2 D4 N
  110. ///////////////////////# B: Z2 b: {7 |% `# B+ Q
  111. simple sample :)
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  112. ///////////////////////
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  113. , f! o5 S4 |/ B
  114. //...... other code
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  115. ) `6 j4 A& e( g. b4 W* j
  116. uses ... ActiveX, MMDevApi, ...;7 ~) n" j: I4 ^4 o$ J7 _

  117. ) L+ R9 ~. p$ z$ i9 b6 Y
  118. //...... other code
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  119. 8 y5 b. k, O6 S- @( J* S
  120. var
      Q+ R* s) m9 g* m# d2 n
  121.   endpointVolume: IAudioEndpointVolume = nil;: L) B5 I! t' [/ a( _) C5 E

  122. , s) A1 |6 k- _+ R& o
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var
    # M& N% S. l: L3 e  K
  125.   deviceEnumerator: IMMDeviceEnumerator;. w+ R: P/ a' y  ?
  126.   defaultDevice: IMMDevice;
    . e: `+ p5 v. _2 |
  127. begin
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  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);7 L$ C7 e+ J9 ]' T5 C3 t4 M& b
  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;- N2 Q3 a/ L3 k9 D; G7 s; b' I

  132. ( Y& X6 e  p+ a( c
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var) e9 E' P5 @; D- c
  135.   VolumeLevel: Single;
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  136. begin0 L9 ]1 ~1 C- x, l+ h, {9 ^
  137.   if endpointVolume = nil then Exit;8 b3 ^, j  q7 q0 w
  138.   VolumeLevel := 0.50;+ f/ G" ]5 |9 K9 L4 @0 H
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);; |/ j  E: K9 w9 H) U- u* M
  140.   Caption := Format('%1.8f', [VolumeLevel])* ^* t$ F1 z- A  G# C
  141. end;8 v, K# _) ?- [$ N

  142. + I- K  R1 e  V: H' v8 u
  143. /////////////////////////////////////
    ; n3 M) k$ H+ Y. t9 [

  144. $ `2 q/ t2 q9 O9 @* k" Y& F
  145. // with best regards ToxicDream
    9 Q% U2 z9 _7 V( n8 I. g
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