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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
& ^5 D2 ^- M- Q0 a- ZBy Mukta & ToxicDream
  1. ' `0 v. ?# Q) l0 O$ @
  2. //for delphi 5# t3 D' o) J; m! L$ }$ z4 U: y! b! w
  3. unit MMDevApi_tlb;" Y. d$ X5 u# j' Q! f
  4.   ^3 t5 x8 x$ Q" P/ Y+ U
  5. interface# S3 \$ \3 F- m5 o5 ]  R4 Q# a2 O
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;# G6 ?7 |. `$ `
  7. const2 N/ y" B. P6 B0 ^5 d4 {/ F; a2 g
  8.   // TypeLibrary Major and minor versions# A5 b% b8 P! D

  9. ) W3 G/ J" j/ W. r
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';6 C6 Q; Z8 r/ g: I) I/ j: l
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';) I" ?. b+ g, A1 y
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';. F3 C9 A/ v8 m* o. H3 ^8 m
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    4 w$ }* X( p: ^2 }+ ^6 `9 v
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';, D8 k9 X2 D0 W% s9 z! C2 `' k' ^
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    ' n/ |. t& g: K# @  ?7 y* y& Q
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';1 ^, \, J6 P, U8 G
  17.   M. Z2 K/ l- Q. s" Y1 ?' X% K
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    ! H5 F3 {" d% A7 ]1 s, c
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;9 Z& S& K8 J. z3 s: g/ [5 f- {/ A7 E
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    . A4 S; d$ P2 g0 U  y! q7 R
  21.   DEVICE_STATEMASK_ALL                  = $00000007;5 c# B6 l2 h7 E9 @- k) O7 z+ w
  22. 6 f, q8 O$ H2 b% S; t3 f
  23. type
    ) q1 T, ^: r4 \
  24.   EDataFlow = TOleEnum;
    / i5 E1 o7 c) r6 u) W; u! H
  25. const
    & M: Y* q2 @* L) T
  26.   eRender                               = $00000000;# K7 `% ^/ H5 q# I6 _8 |+ A3 W
  27.   eCapture                              = $00000001;  e) F6 q: w5 l5 }
  28.   eAll                                  = $00000002;! e: _  f2 l: l( L
  29.   EDataFlow_enum_count                  = $00000003;
    0 R# e/ I9 c+ l  }! n9 u+ C
  30. 4 \0 |4 V0 V& B- S  t: b: T4 t
  31. type
    0 f( A) ]$ A4 S# S. v) n1 H
  32.   ERole = TOleEnum;& F* j# }& c5 s7 l. D0 f) m2 K2 P
  33. const  i, K* Z  \" @& \" e
  34.   eConsole                              = $00000000;
    ; n" u( @* Q6 d/ L, L  n2 n
  35.   eMultimedia                           = $00000001;$ _- {/ Z; X5 |% L5 o, Y- ~
  36.   eCommunications                       = $00000002;
    & H  N" b. W0 r: H
  37.   ERole_enum_count                      = $00000003;
    " v, C8 w9 P& e9 ~! |

  38. 3 r( g- i) v5 N/ P  H( R
  39. type
    ) |- E9 f. R: ^! s: }7 S
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)1 j4 X! V' d1 n* g3 }) e
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']' y7 K  \4 n9 @; J! Q8 g! b
  42.   end;
    # `) `* O. m/ z  k( j5 W4 s2 j
  43. , X$ n) i2 Y# _, g  w9 B4 B+ W+ J" `: M6 Q
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    ( S* _- s; J' A7 y+ j7 n
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']! a$ r/ [# k1 m. z  r6 c
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;3 K/ {, U2 W( U( h" G
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;% |6 L7 f; `/ v7 }7 w3 ~
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    " c. ~7 [9 m* i
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;- T  E$ q( S) b; K/ M% D
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;- Q* ?& x  U- Y4 J4 |
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    ! x/ A; d% [; G7 T) b
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;/ U( S8 A+ Z8 Q) Z
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;0 H. [, R4 ^* d+ C- j8 U3 t
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;- c) q* [7 F5 R, N
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;, `7 w. f: `3 M; P5 P; w
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;. ~* k; o9 v$ g3 @+ u
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;/ N! N$ a0 S) q5 ^$ g( D
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    ; i( J9 p2 b( S' d9 g
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    + \; ^) B0 b8 i/ W# x" Q
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;1 `' [0 c" O$ S/ [# M
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    0 \7 e; U. m# @4 N
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    5 E% U5 ^# r8 E3 A$ Y% V! m
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    & g0 v1 }8 l# `! Y! a: z; k1 h- ?
  64.   end;  X" Y# q: E+ W7 i# X% P
  65. & _4 m4 @' T/ j- T7 r
  66. {  IAudioMeterInformation = interface(IUnknown)0 X! I( m$ k6 {- `  Q
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    % R5 p7 ~4 z0 {. E
  68.   end;}
    - i1 f2 o+ S! \0 A! {
  69. & U6 d# M' A2 E# r  J
  70.   IPropertyStore = interface(IUnknown)
    + T; }& M  ?8 |# q
  71.   end;  S  p9 f1 B* r! |& h* o0 n: s
  72. ( C0 ?. k( m+ c" U
  73. type
    ' d/ }2 Z6 Q4 H; z9 U% q
  74.   IMMDevice = interface(IUnknown)7 ]9 F$ f. E7 C0 N
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    7 w, z4 [; F+ M, L# [
  76.     Function Activate(  refId :TGUID;( a' C9 j) R; }* O* Q" }) [
  77.                         dwClsCtx: DWORD;; B! h( v9 y4 N: B. y; _" P% }
  78.                         pActivationParams: PInteger ;
      \/ o# @- ?% T6 ~4 w7 c+ k
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    9 g$ t1 K6 C# J' L! L0 b
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;- }$ ~: l! p$ Z, g1 W) A% {. J: ~
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    2 D2 K6 g2 K! h% v3 x& O
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    7 W- ?, ]# d3 D1 A
  83. : b9 X9 y/ z: t
  84.   end;& X; v# v2 N  N7 b. v& P3 f
  85. 4 {% n3 s; ?* P" w
  86. # Z  C( {1 o- f% z6 N8 ^  i
  87.   IMMDeviceCollection = interface(IUnknown)- Q0 W+ E  ~) j! x: y! f( }
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']/ M% q; |6 c5 Q- @% U4 t% U' z3 m) P
  89.   end;
    0 P8 S7 V) D7 N/ _- x

  90. , e5 Z, M7 Y# g) G% Z3 [) C
  91.   IMMNotificationClient = interface (IUnknown)
    7 W) \9 K6 J, D2 a
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']3 t- O! e' D. h* @$ V
  93.   end;2 C0 P. \* X# @9 ?) P% q/ ?

  94. * X* Z6 m6 _$ f! a0 ^2 D+ C
  95.   IMMDeviceEnumerator = interface(IUnknown)
    $ H, a( C9 @5 Z, p- F
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']% z6 L" d2 O$ z( \% ?( W
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;- {" f6 u6 m6 `$ O
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    5 p% R8 b! Y: U, e3 j- Y" _
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;. C7 B1 Z, K# ]# J6 D
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;/ _* t2 y, F' j6 m% J
  101.   end;
      t& N( S, M. u* ]6 I/ V

  102. 8 j# ^. L( ^  I
  103.   implementation
    & q. N! Y7 k8 |4 ~
  104. end.$ D! t' K" V1 u  u' }4 x- \. k$ O
  105. $ \* @8 u' s9 [8 @
  106. Thanks & Reagrds,
    6 e6 K. N, _' t0 r. m! @, w
  107. Mukta ...
    ) G* f4 L- O% o8 t2 S
复制代码
  1. 3 H: U8 Z6 m- E! ~  D7 b' Y
  2. it's work in Delphi 7, Z: C1 ?0 m# B
  3. //////////////////////////' D5 u) i8 K  w2 w1 g
  4. # Z" ?7 B, Y3 i* H' ]: E# I
  5. unit MMDevApi;
    $ m+ _; ^$ G" j
  6. ! ^; B. A2 y6 X
  7. interface
    9 Q9 J9 O4 J! n4 F4 J& I6 u
  8. # N8 q/ ~8 ?' J  ^- B* v, L
  9. uses. {* o8 z- c( R# |# I
  10.   Windows, ActiveX, ComObj;
    $ X; v( v- S% ?! \# l) y# @

  11. 4 U6 X; r; P  C' W* b
  12. const
    1 t% c  q  j( E: Z
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';- T: C2 v. N8 D4 u
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    8 M& B0 N! z  W, C( t+ k1 b' v
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    8 s* i& z6 u6 v! b( b- S, ^
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
      N4 a$ [) K3 ^) A% y
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    5 X3 V2 l8 b6 [
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';7 U: h3 Y4 j5 P+ d6 W1 @
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';9 h0 S# M* S5 b$ L

  20. 3 P/ f) k$ J0 \! u/ x( E" c& u* c
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    + Y1 ?4 X8 X& U2 J
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;: Y7 K+ w3 D! Z* D
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    / a/ m$ y( t9 v5 R- e+ _4 ~! z
  24.   DEVICE_STATEMASK_ALL                  = $00000007;0 w; _  q+ X* @
  25. 2 B" N% }3 K* O# R* p  k! g
  26. type
    * N- U6 L$ w) G4 O  Q) m. h
  27.   EDataFlow = TOleEnum;
    ; ~1 ^3 _% @) J& S6 U1 Y8 N

  28. ' \, j5 o* M2 e6 v
  29. const
    + B/ h" n% |9 f. S* q# B6 c
  30.   eRender                               = $00000000;  s+ R  L1 S5 m; g2 \. v9 R
  31.   eCapture                              = $00000001;& ]2 b# n, n$ ^4 X0 `% T4 g# @
  32.   eAll                                  = $00000002;  G* Q" J2 E- {5 T- B! g: o
  33.   EDataFlow_enum_count                  = $00000003;# A/ p2 N8 G/ p) ~. @

  34. * m2 q1 R: q/ f  C  L/ m
  35. type. f1 D' P0 @1 y- {
  36.   ERole = TOleEnum;
    ' O( U4 V$ i* I) X- |( K0 a
  37. 9 M6 l8 G! p8 x/ ~: i' o+ ]
  38. const
    8 R3 `  m7 ?: }3 g" Z& h, E
  39.   eConsole                              = $00000000;! t- m+ [3 Q# t5 ?4 }, j" O
  40.   eMultimedia                           = $00000001;2 W7 y* l7 H% q- N. b. `
  41.   eCommunications                       = $00000002;
    ; J# R/ l8 s- W1 N. v4 G( S
  42.   ERole_enum_count                      = $00000003;
    4 |( g* D" m$ W/ N9 n5 q, I3 S" C
  43. 6 p( V  \' r; k! `" B' X
  44. type
    + H6 T; }) @# B# X, Q
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    7 T, M! h9 M! h8 g4 i* B
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    - p3 i1 _" j2 \: `: D
  47.   end;
    " k& x9 D  E, e/ `/ v

  48. 5 Q$ B1 i1 |7 e! m. d
  49.   IAudioEndpointVolume = interface(IUnknown)
    * E) H8 X0 p/ s1 C. ]
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}'], m: B/ z3 D- G0 |5 a6 w% |
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    $ t9 T4 D9 g. s2 L
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    . {! E' b3 v3 b, J) Y8 |
  53.     function GetChannelCount(out PInteger): Integer; stdcall;  ]3 ~* l+ m% @% f
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    / z" J. D1 j2 c6 }! e  c
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;5 r6 ^  u9 Z  r& J- j" C
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;/ K5 F' V- R. |/ T/ }$ P
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    5 w/ W+ D* r" O  \. e8 O# Q
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    $ m2 p* p2 H4 v/ R
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;/ K9 k" H" B7 p5 a7 \' M6 |: b
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    5 c; ?3 @( ^0 M7 u; _* U. J
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;3 B% s7 E- Z1 d( o( {5 X
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    4 _' I' K- n+ [
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    . m. m. Q/ ?, Y1 }
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;/ H9 P+ h, _( S8 g7 R1 n2 U
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;. _; n$ @- C$ e
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    2 m. K+ r8 A/ x0 f0 e3 r7 B& M
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;, D2 g2 n" K) u0 {% ^+ r
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    & T5 ~5 U; _& F0 B7 H* h
  69.   end;
    - r* x9 g3 ~' N1 N4 z8 [) j2 Y
  70. / u4 Q, j/ d2 u" X# Y# A, Q
  71.   IAudioMeterInformation = interface(IUnknown)8 `* }. u+ A/ [2 f. Q
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    6 `- r' C( y  }( z) @- I) Z
  73.   end;
    / s3 u  {" ^+ I0 d3 ?

  74. 9 \, r. l% a0 t, a7 ]( [5 [. F
  75.   IPropertyStore = interface(IUnknown)7 J2 o4 K& T3 a6 ~
  76.   end;1 }+ [6 k2 D3 {& |% D
  77. " y# Z- h' z5 F# q
  78.   IMMDevice = interface(IUnknown)
    # C4 m) x1 @* r/ L; o7 E3 r0 B
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']9 B# ]1 h* v" y% @, Q  O
  80.     function Activate(const refId: TGUID;" Q7 J. Y! e7 w/ D
  81.                       dwClsCtx: DWORD;+ l& `5 J1 r2 \
  82.                       pActivationParams: PInteger;
    % Z3 {! `' H: D# n) F
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;8 M. l  d4 s, N) y0 _
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;% W% l2 \% @4 k6 i* l
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;- v0 _& p# P- f$ e  e& R
  86.     function GetState(out State: Integer): Hresult; stdcall;# a  Y3 z* E3 Z# _
  87.   end;6 w* x. S' v. o4 ~# ^/ j
  88. $ Q, @, N) W% K( y
  89. # g$ s6 i1 q0 n/ l
  90.   IMMDeviceCollection = interface(IUnknown)
    6 b: n, P5 e3 A7 ^$ E( S) c2 Q* a
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ! i  A' I! P6 C4 B! k( H' u8 \
  92.   end;# h* k* {0 K, k3 j. T7 o1 v0 u
  93.   ~) q, X7 ~4 j0 w
  94.   IMMNotificationClient = interface(IUnknown)
    ) S% C, @' {5 u* i. F& D( h
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']2 O  d. H$ e. g
  96.   end;
    + A& [3 u  s4 |: _8 H1 z0 @

  97. : l, L  D/ q" R
  98.   IMMDeviceEnumerator = interface(IUnknown); g$ a  v, c" u
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']' f5 }' _5 V, Y# C
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    5 u* N# P2 V% ]
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    ! B! e) ]1 x% O( x0 w% `$ F
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;" D* R0 i2 b) d/ S
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    , r( p7 O' A6 x3 _1 X
  104.   end;+ Y' Q6 \+ x; l6 h. D' I# e
  105. - v% i  u3 A' s" i
  106. implementation
    - k6 `# W8 \3 m. {- ]' R
  107. 9 B" l- _3 o  g% [
  108. end.! {4 P$ z6 h4 ]+ l- `( A

  109. 3 }3 @( p5 E* d! u; D/ ?, e; c
  110. ///////////////////////
    / A  V7 P; w0 I* d" Z1 t1 m+ d
  111. simple sample :)9 z1 I4 [4 ]' w1 r& y) w9 ~- I
  112. ///////////////////////, q* J4 s3 |& S5 }% \
  113. " H% \+ `# Y; A, w7 k
  114. //...... other code+ M+ Y0 E( H+ O9 @8 J

  115. , v8 S; |$ i4 M+ U, e
  116. uses ... ActiveX, MMDevApi, ...;4 }, |0 C3 U4 e2 M

  117. , J  \9 w. i- b
  118. //...... other code
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  119. - r4 r/ A0 a: W3 J: B
  120. var; Y5 k3 W  A/ [  e  {
  121.   endpointVolume: IAudioEndpointVolume = nil;
    , C. Z" L3 X! f: t7 g& \
  122. 2 [* _4 w& [& [6 v$ ~2 Q4 ?
  123. procedure TForm1.FormCreate(Sender: TObject);
    * [. t; L' v  N" d6 e& O
  124. var
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  125.   deviceEnumerator: IMMDeviceEnumerator;) c: d! Q5 c6 Z( ]  T, v+ [
  126.   defaultDevice: IMMDevice;/ ^$ |! P. L6 n4 X4 J8 p
  127. begin
    . }+ Y1 M1 q. R) M5 ^
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);( P. h5 [9 J4 X2 e- L2 B5 k- t: N3 X' n
  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. ; C. O% h* I' i1 e: [% R2 ^" C+ _
  133. procedure TForm1.Button1Click(Sender: TObject);
    " r+ I. [0 }7 L' U+ E
  134. var
    # t& ?  E( k" c) n. o4 i
  135.   VolumeLevel: Single;9 m% T  `% y9 E
  136. begin
    + j$ S) }' |& z; i: Q1 C
  137.   if endpointVolume = nil then Exit;+ Z2 O4 b6 W4 X0 j
  138.   VolumeLevel := 0.50;
      }* ?$ d! ?. \" b, Y
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);* o5 Q7 L! L  t+ {/ [
  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
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  142. & U% k6 |: D  \) S: }' B
  143. /////////////////////////////////////
    1 i1 Q( }0 ]/ T& @2 G* N8 ~
  144. 7 I3 y; `" U% L& D$ ^) n  p
  145. // with best regards ToxicDream
    + ~% a" G( f5 o& E3 h  ~
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