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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-a8c9-2e27eb9ec0587 [6 c8 m# M" [# p0 G2 _4 j
By Mukta & ToxicDream
  1. " i1 `% f& c0 k
  2. //for delphi 5, v. o) s' j) G, X) s
  3. unit MMDevApi_tlb;9 U9 {; j" D) K) F+ G/ \
  4. 7 z- T7 b, q4 r, R* G0 s# j, [
  5. interface0 q- C9 e% P, ^6 w+ O: P, k8 P7 \- E
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;% ^6 Q) c. h: e
  7. const
    " T% Q9 D5 @8 P' o  Q/ {
  8.   // TypeLibrary Major and minor versions9 y# `) N- v, J6 G) q

  9. # A4 f2 Y7 M* Q  n
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    ' _4 s4 T7 I0 D" ?5 I5 ?& L
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';5 L2 o; D% |& G4 h# F  x0 ^0 j
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    8 \: S8 T6 D5 r! l9 o# a
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    : X! ]& x" ?+ \* F6 z
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';* R. F- K0 X4 Q  ?5 D4 f
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';) c' k) j/ I$ {% b) {4 s
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';& V9 i; L3 y: j# y+ v

  17. 5 o+ D8 I$ ~* I: _4 @8 n
  18.   DEVICE_STATE_ACTIVE                   = $00000001;9 U- N- M. V1 ^# _" `
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;. [! B) D7 d8 @: B% |
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    2 v# o. e& `$ V8 {7 O
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    ( y3 T& I; E/ Y" _" u1 p! h; _0 Z
  22. ' G! O! U, ~* Q! f  M! s* F9 \
  23. type  m, S1 n- {; G$ |3 n5 O: K- `
  24.   EDataFlow = TOleEnum;7 `# ?- P' |4 G5 p/ O* {/ E: q
  25. const% H$ I# O: l) o4 D' C
  26.   eRender                               = $00000000;
    - l7 E- R7 A2 H% o
  27.   eCapture                              = $00000001;: ~0 U$ d' D4 e' y5 T$ V; H7 W
  28.   eAll                                  = $00000002;
    6 {/ B6 ^! u, r6 s- ^" g
  29.   EDataFlow_enum_count                  = $00000003;
    + B, A' g  l, A" y" ]3 [6 O
  30. 3 p( x# Q; `3 @) p" @4 _* g' L
  31. type
    2 |/ }7 y8 P& I, D& T
  32.   ERole = TOleEnum;3 G8 q- o  m/ Q& }
  33. const
    * _* R' X) a1 x8 E. v
  34.   eConsole                              = $00000000;) r, A: s4 {  w; p
  35.   eMultimedia                           = $00000001;! h/ \' B* r5 |4 t5 ?2 H. m/ f7 f
  36.   eCommunications                       = $00000002;$ m2 O' V1 a6 w; P8 ?3 k- W
  37.   ERole_enum_count                      = $00000003;
    ; b) s* W( p4 O. h& m8 M; [

  38. - L+ |& x$ s1 X6 R8 [) a& J
  39. type6 q( A$ G. K; P5 g) B$ m6 L1 U
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    $ e( L) v3 ?: r$ j
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']: [2 h, z; J+ x- m/ }
  42.   end;7 v: T4 |( L2 G& e% j% M% {& V( O
  43. 6 B4 i2 d2 n! C0 J! y, V- D
  44.   IMMAudioEndpointVolume = interface(IUnknown), ~) ]# ]' V9 U- J7 A: w
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    3 Z8 W' s5 K' {, ]. L% _2 o
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;+ `- l) q, V+ @8 ]3 T
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    - R6 K/ V9 J- |) M8 F! j  X; Y
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;* K5 D# N* o/ Q. @
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    * H8 C7 N- O  {  @4 V3 j, `; ^
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;: x0 R; d' u4 P$ Z! g4 N0 D1 o
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    * X  d' G4 p  q4 b$ f7 a
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;) ~. A+ S& c$ `3 @. U- F: w5 s/ j
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    8 H# |8 h+ k- G4 ?# ?& `
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    % x9 G6 T( H: V3 I6 C/ c5 T( Q6 D
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    " `* z5 K/ e: u- Z8 E
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    ' [' Y; S* D7 O: Q- |9 Y3 Y& B) @
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
      N1 ?* Q+ Z; \, k3 ]5 }9 X
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    - G1 j) w) m( S- P& ?: w9 q: Y
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;3 t" K( Q* {  H$ U# N
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    . S3 _0 d0 ^( i3 }7 M( T; ^. B9 V
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;* }# e' A2 M1 A
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;; W$ k/ \/ w. J6 S+ H8 r
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    . {  r4 a6 D/ r
  64.   end;" }8 i/ ^9 T2 m7 |# l) T' \1 O

  65. 4 W: ~. c# ?/ a8 D' S3 e6 l6 p/ x
  66. {  IAudioMeterInformation = interface(IUnknown)
    4 ~) F% r4 D2 W* ]( q% e
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    ! G) ?( P" c5 v( l  Z3 g$ F3 X
  68.   end;}
    . n1 H+ G% p- n

  69. * g/ o4 T+ B( R/ I* x
  70.   IPropertyStore = interface(IUnknown)
    * ]4 b$ r* L6 O
  71.   end;
    & W' ^: k  F5 \6 ~" X8 [

  72. " f8 Y  G# W' ?  s/ [
  73. type
    - {7 v, T* B- a- e! H4 i, V
  74.   IMMDevice = interface(IUnknown)5 O% h; {  v, b$ G
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
      [4 I. X2 ^8 {6 }, G
  76.     Function Activate(  refId :TGUID;. @0 O4 F/ S& d9 _- g6 j9 g
  77.                         dwClsCtx: DWORD;$ ^; u$ x3 s% @" M7 ?( T# o5 C
  78.                         pActivationParams: PInteger ;
      l$ |4 k" O' m# o
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;9 L( v- j; a4 B3 l
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    - _2 L& ?& o2 l5 j) h6 L
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    # J: K- D$ y- X' b6 J: K8 @& K
  82.     Function GetState(out State :Integer): Hresult; stdcall;
      j- a2 e% Q5 h$ e, y& d6 E
  83. " M, r# s% [# I+ j+ q- {; ?; r
  84.   end;
      k+ P+ i$ D+ ~5 R1 ^1 x* g

  85. * t* z4 V  W  d  e% `/ q/ M

  86.   f- B# r2 e% D" T) T+ s+ w
  87.   IMMDeviceCollection = interface(IUnknown)
    1 e5 \5 q% h: h: w
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ! W$ \' T: V4 ^7 V
  89.   end;: g( U3 H0 F% G
  90. 6 h" x3 o! Q3 O* \
  91.   IMMNotificationClient = interface (IUnknown)
    # R8 `) f* S$ b
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    " j) f$ \" s( w* `5 ?7 O! W
  93.   end;
    ) Q! q$ W) \) z$ I) J( c) }

  94. 1 y% ^! C: G1 s+ B7 J9 a) v/ [
  95.   IMMDeviceEnumerator = interface(IUnknown)
    0 i+ B$ r7 a3 x# g+ u9 c2 l
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    % v7 K: R9 q" D5 s7 @+ x
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;9 j" _( w% I" z+ V# a
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    + e) r" J5 ~0 W% y9 ]
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;% P, C& a$ I$ T" r. [8 q, q; C* n
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    : P- f, a6 g% k$ [; }
  101.   end;; L: b, {2 u/ w5 ?
  102. + L8 C% O4 a! O
  103.   implementation: e1 O0 \) t/ E2 Z8 }! d! A7 q8 `
  104. end.# f3 g: S6 C, t# X! q

  105. ) M/ W: F9 k3 \; q) P& C( v3 k
  106. Thanks & Reagrds,
    ; s. `1 v2 P- o. F6 B
  107. Mukta ...
    8 c/ ^3 s* L  c3 m5 f/ b
复制代码

  1.   @3 L/ p3 C8 Q+ I/ }1 }
  2. it's work in Delphi 7
    & F4 G3 L( h! n' j3 v* S
  3. //////////////////////////! h1 j& T4 ~/ H

  4. : D9 G' z: E. [+ O2 E0 C7 S+ C
  5. unit MMDevApi;
    6 m* [5 V5 h- F  g

  6. 2 C' ?9 l- E- K: V( a
  7. interface( ~* L+ T% e5 {$ L

  8. ! G# w9 I5 _; C7 ~2 j
  9. uses
    , f, l& f6 Q) _& N/ i2 y
  10.   Windows, ActiveX, ComObj;
    ) p" y+ `' [3 [7 H- H; @9 @1 n: @" a
  11. ) {* t6 v8 }) _- N, H7 I
  12. const
    , A3 L/ S& ~8 T& q' p/ d9 V- A
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';! v$ n6 J2 [! T4 ]$ e  t/ c
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    8 q; |8 N" \; B% K; c( A. h( |
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    * ~# R1 \; y1 ^0 p+ E
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';* }4 \0 R) u$ _
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    8 E- V2 Y0 c) b- F+ C( a) r
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    ' s4 b! a$ g8 P+ J
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';+ n$ {# W7 m+ d. l8 m

  20. $ S# c' ~4 @; Q- C: S7 F
  21.   DEVICE_STATE_ACTIVE                   = $00000001;8 f& O# j. N- a* \+ n4 L  z
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;: l7 _4 h) _' |5 h. d7 _
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;  L1 f9 A0 e5 T, {
  24.   DEVICE_STATEMASK_ALL                  = $00000007;4 b1 L3 n7 @3 A1 `
  25.   G; k$ Q% F: |* c9 Q9 B4 O3 |
  26. type
    8 F* f2 o' _& ]8 F( T% c. |- O8 b
  27.   EDataFlow = TOleEnum;
    1 Y' q2 \" l0 Z: c% x% ^- V
  28. : N( R, g4 d0 i# O  y5 m* h
  29. const
    ; o2 v5 b5 z8 `/ M: c3 y3 S
  30.   eRender                               = $00000000;
    7 h" X& j/ O$ v) i, b
  31.   eCapture                              = $00000001;
    * q3 d, S  T- N
  32.   eAll                                  = $00000002;
    5 _5 {* ^3 o7 B3 l: \4 @
  33.   EDataFlow_enum_count                  = $00000003;0 ^! {; c9 y2 g* o! I# U
  34. . ?; j) O6 ^: K7 H
  35. type2 R2 [; @) O# s- o4 u$ z, v5 {
  36.   ERole = TOleEnum;: ]' o. u1 D  f: i% K7 ~2 w

  37. ! G3 @( [6 S& }* L
  38. const
    ' U$ i5 n) t3 E7 _5 [7 Q# S
  39.   eConsole                              = $00000000;  J5 e) a, C+ u8 x, h7 K/ k: g
  40.   eMultimedia                           = $00000001;
    4 M6 @7 t* c  E# J
  41.   eCommunications                       = $00000002;
    : p% d  e! J; c! f7 [8 @
  42.   ERole_enum_count                      = $00000003;! ?2 p' a  r$ T( B- K' q
  43. * U' L* O& B) r- i7 @2 M5 u6 ]" o: J
  44. type' }, b1 l8 b( D: h- G* i* `
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    ' ^- a. `* v" x1 K4 C0 l
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    ! {7 f5 I" z& g3 f5 m& S
  47.   end;
    ! B0 W7 X* [  P0 P) B
  48. $ P+ B4 e2 \; |# R/ ?4 y. M- P
  49.   IAudioEndpointVolume = interface(IUnknown)
    1 k' A4 q% D7 G  U4 {
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    0 {. `& ~0 N! D8 C; e' I& {7 R) ]* V& B
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    + S4 }4 j3 j0 N! n8 f
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;+ {8 t6 }2 S7 V  @7 q
  53.     function GetChannelCount(out PInteger): Integer; stdcall;$ Y3 g, A2 \- k# \; i0 r. m
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    6 F( ~- ]3 Y3 K* D7 K' S( J
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    9 G' ^9 X8 J* b9 [* J; i/ s
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;6 E# ^3 C3 ]# _* H
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;+ P2 H: H9 q" ?0 Q4 I, }
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;4 s# E! S  q( ~$ k) x/ @' i% C
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    " c; m; q2 E/ @) _9 c
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    3 `% O; L# P" v$ Z' v
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;' Q% K& M& b# {; Y5 G1 W. x% b
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;- \+ T, l6 T5 Q8 h& ]
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    / Q) u% P/ ^, \$ u
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;* Q4 y4 I' _6 _+ L; |! ]7 Z
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    5 f+ d4 l$ t4 s* o, a( X
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;* e7 L- J+ T* i0 I; \& I: k
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    / Y+ y% |  i! w1 D' n
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;3 v- }9 c4 K( M+ ^0 e
  69.   end;4 |/ W/ |0 f& _# W) l0 s6 O/ S# k

  70. ; y: W1 k0 k9 d  A
  71.   IAudioMeterInformation = interface(IUnknown)
    5 Q# C% S9 S" ]6 U/ g7 r
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']0 y+ F7 F2 U. h" N: \) G- U
  73.   end;$ ]2 {( Y9 C( o9 e
  74. 3 S' _9 Q. U0 Y* r
  75.   IPropertyStore = interface(IUnknown)- t0 F" y$ I8 T5 s- H
  76.   end;; v: c8 U: m% M7 ^3 r$ C
  77. * s2 d, o7 c7 g
  78.   IMMDevice = interface(IUnknown)
    " c& ?- C1 d  U
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    % O$ |7 R- g% C3 U: N0 W
  80.     function Activate(const refId: TGUID;9 x( c9 U3 X: R7 l, |
  81.                       dwClsCtx: DWORD;& a6 c  Q% ~4 L# V4 K
  82.                       pActivationParams: PInteger;
    % y& h' f: Q1 X& p6 h% \: v8 G5 I$ }# @
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;/ Q- ~1 B% B6 t- t0 }
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    % F' @+ c0 E# D! }, z& x0 w
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;0 o$ K% |! y2 d+ F) Y& X! Q$ g' |$ t( s
  86.     function GetState(out State: Integer): Hresult; stdcall;, D1 B1 Q# @. G
  87.   end;
    # {* r2 O2 j2 K$ W7 {) ~
  88. : _  S4 ?% G4 q

  89. " |9 U. V/ d8 o7 k* ~- k! i
  90.   IMMDeviceCollection = interface(IUnknown)
    . F7 H* l( P7 V; _
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}'], D6 G1 ~* B0 X. S! z3 J
  92.   end;
    . @# G' Z$ v1 a3 ^9 a/ h

  93. $ z5 V0 ]+ L0 o9 h9 F% k
  94.   IMMNotificationClient = interface(IUnknown)
    ; ?" t3 i. a' P) i% `
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']9 l2 u5 j7 {9 g5 R) l1 z# x
  96.   end;
    & m& F( m) g+ b$ U8 L

  97. & P& Q: I( q0 e1 e2 D: m9 T
  98.   IMMDeviceEnumerator = interface(IUnknown)
    $ S, P" z- o9 w1 `4 O
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    2 |% @5 T6 M* E' ^
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;3 W1 X- L% p4 n& B% `" U2 V
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;' z, |  x0 V# W. y" U: d
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;& Y4 y' w. n2 k* c0 @. }1 @
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
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  104.   end;
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  105. ' q: Q4 f: k3 I
  106. implementation
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  107. - m# X/ v  J) _3 t; D* H& W
  108. end.
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  109. 5 f9 n- b# c8 _
  110. ///////////////////////
    : |1 `" ~/ b( C! y
  111. simple sample :)
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  112. ///////////////////////
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  113. " Q8 t/ _" w# G5 D5 s
  114. //...... other code' s2 _8 D: P$ o+ W
  115. . q$ \  G3 f7 L/ g+ K
  116. uses ... ActiveX, MMDevApi, ...;
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  117. % w$ c" }# M6 O8 ~- q/ l5 v& h1 b% {
  118. //...... other code
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  119. 5 R0 Z9 b5 |( j1 i
  120. var: ]: {: E* ]; i0 M" e) _/ K) y
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. 0 Q, ~6 j2 E% Q" {+ m
  123. procedure TForm1.FormCreate(Sender: TObject);# @! G5 D# V4 Y, W3 g' b- u0 h  K! [4 J8 k
  124. var
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  125.   deviceEnumerator: IMMDeviceEnumerator;
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  126.   defaultDevice: IMMDevice;
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  127. begin7 N8 i( Z9 i  }9 ~
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
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  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);" b/ l, N3 `) Q2 U1 l
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
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  131. end;1 N7 v. `0 w, i" m/ b7 }# s( Y
  132. ' Z& |) B. ]- N, H/ u# {, x
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var
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  135.   VolumeLevel: Single;
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  136. begin( x8 Z5 m; q' d# n2 I( l+ s
  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;
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  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);+ B. j* \! X$ v
  140.   Caption := Format('%1.8f', [VolumeLevel]), d/ \1 O3 D$ d; Z) @2 R6 v
  141. end;0 Y1 Y- F2 @5 ^7 M6 {3 d: B8 S
  142. 8 ?; _$ e7 K' V  C* ~; A7 x
  143. /////////////////////////////////////
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  144. . }! p3 }* h& [- T
  145. // with best regards ToxicDream
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