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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 y2 a+ t% k. f& x2 Y8 D
By Mukta & ToxicDream

  1. 7 ]: e) }6 t2 S) f
  2. //for delphi 5
    & B- _" F9 m7 d, a' Z
  3. unit MMDevApi_tlb;
    1 M3 M( c: ?# N, ~
  4.   m- Z3 P0 m' v" v* h, Y
  5. interface$ h6 i5 q. H/ E. J4 H
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    ; j6 H7 [0 O4 O* t( |! b9 O
  7. const
    8 r, {. x+ G4 E/ L. P
  8.   // TypeLibrary Major and minor versions) X5 V8 m! [- K/ |6 |9 c6 k3 ~
  9. & W" R7 h) v8 [4 C# b, E- v- v9 q! C
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    ( e7 W; [7 d( E/ I
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    1 q3 n( ?% f( Y
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';: d5 s8 D: Y- A3 y9 K+ o2 y9 V9 `
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    4 j3 q& E# B1 }0 ^
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    " W0 r( r9 A4 |3 g7 U  m% f( G
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    5 R; c$ b- U! k% r8 K/ q$ d
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';( {1 S: q- f  {, o& b( Z5 M

  17. 0 {. V9 g& p+ i; d+ u6 a
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    # }  Q- F5 F& X5 B; g
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;  I) Z/ w8 l5 t+ u1 @4 p8 @3 R
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    # Z* m) l0 Y  q
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    3 _1 a7 t) _3 A! [
  22. % C/ z. C- ~* _
  23. type; R# w3 O: u0 P, y' l
  24.   EDataFlow = TOleEnum;' ?" o& G8 Q9 \. a  G- F6 u5 Z' C8 W
  25. const
    7 v. P( V; L$ E6 t. u  D' O
  26.   eRender                               = $00000000;
    % X, Z: T1 O/ d& J1 {
  27.   eCapture                              = $00000001;) C! b4 s+ f# `& U: y+ B( {8 Z: s
  28.   eAll                                  = $00000002;' }) ~; W2 s; h/ D# }
  29.   EDataFlow_enum_count                  = $00000003;
      l1 w' g6 Z  n

  30. 6 D( c' @4 a$ G
  31. type
    / v$ P' N' q0 g
  32.   ERole = TOleEnum;$ K: L8 v8 n$ u. I' D) h
  33. const( s5 D( {9 B6 X- b" E
  34.   eConsole                              = $00000000;
    5 d; X" u# Z0 |; s4 _9 S1 E3 R
  35.   eMultimedia                           = $00000001;
    # T3 D, h" t# R" U' f, N" q
  36.   eCommunications                       = $00000002;
    9 i! ?. \' v, S( E
  37.   ERole_enum_count                      = $00000003;" t4 r: D4 s8 W

  38. 7 s( ~: W& J2 y2 A/ s
  39. type
    ) [, x5 A0 y7 V2 G" d4 x; U0 ^$ f
  40.   IAudioEndpointVolumeCallback = interface(IUnknown); R# C& Z* }/ i# O6 ]) ?- L. t
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']. W7 _6 G6 N  x" [/ V
  42.   end;
    ! t9 Z0 R( I- \; @2 p) o" |- S

  43. . N5 M( y5 Q( v$ T
  44.   IMMAudioEndpointVolume = interface(IUnknown); m/ o5 ~4 l: x* N
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']1 }: X. X8 r) e4 M3 i$ T
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    % e2 m4 {2 \: {
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ! ^- a1 Q" ~; M
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;4 o- \7 H1 B4 f! @' ~
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    , K: r4 [+ q8 o; ~) W' T! K
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    * Q" `. _3 q) Z5 V+ }% `$ j
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;! j+ g. r$ g& v) {! u9 i
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;9 v1 S- Y( k+ g6 _
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;  k9 L1 m, {* E  l
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;$ F+ E/ a, P6 V. P
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;* i5 G' ~& F8 D4 U$ W
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;- V( [4 i/ t  ]
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;6 `+ [1 A  I# |" j
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;! c/ y# p7 C3 b1 {
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    4 H7 f0 o1 p' u* c$ Y. }' r
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    4 B4 K3 c$ u6 P+ y/ d4 C/ M
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;8 ?; T) R- \9 d% P0 w
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    * @2 n8 G9 F! `. C# p& m
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    + e& R9 ?, F" j. b% |) ?( G4 w
  64.   end;
    5 `: b' k9 `. }

  65. / u& R: j  J3 f% z
  66. {  IAudioMeterInformation = interface(IUnknown)
    2 ~+ ]4 r. g' w; j1 @
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']% U# D; i" {! s+ i. j
  68.   end;}# L. T/ ]! P2 I( {
  69. . ^' {: v% l) M* g
  70.   IPropertyStore = interface(IUnknown)
    5 `) i3 \6 R9 }, ]- b1 q5 Q
  71.   end;5 D$ C( @- |0 q: O" Y
  72. ) P' }+ c6 v, k1 i
  73. type1 @# K. _, [+ j" i& k
  74.   IMMDevice = interface(IUnknown)
    ; Y6 N8 m. ^0 h2 [
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    : o3 N# T, M9 [& z/ ]
  76.     Function Activate(  refId :TGUID;, ?. o1 F% ]' m9 R
  77.                         dwClsCtx: DWORD;: e  E- A: V! n3 p. u
  78.                         pActivationParams: PInteger ;
    9 y  f% M& b, E$ ^
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    * f8 o; a0 Z6 I/ i2 Z. L% Z
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
      Y* Y, X0 ^. Y* m/ r. j) N
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    * v# l0 U. K! j* z: b
  82.     Function GetState(out State :Integer): Hresult; stdcall;5 D3 |# e  n1 D5 V# y) b6 s( Q
  83. # A# [) g! y; X( W+ n5 R
  84.   end;" F8 E# @- Z- w) A. i
  85.   b1 l1 b  d! |. N# u6 m- Z2 W( G

  86. ) J! |2 M  _+ c
  87.   IMMDeviceCollection = interface(IUnknown)
    3 U$ r0 x$ t2 ~% O4 E1 S6 K( s) W$ T
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']% F* k0 b+ c+ n: Y! [( T, d
  89.   end;3 m/ d+ P. i5 E3 ~
  90. # g. g! w9 H  ~9 c, h4 B/ t
  91.   IMMNotificationClient = interface (IUnknown)
    : t3 p  l, }5 n  y2 I6 D
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']+ m7 Z7 \" h4 z; I- R4 U9 ^
  93.   end;) H" m8 r2 U* S5 F' F* E- E
  94. ! @6 H! }) a1 T  w+ P
  95.   IMMDeviceEnumerator = interface(IUnknown)% I0 _1 X2 x0 r2 f
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']' i; y5 ?8 r( |  E% U
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    3 P( q7 o  n& [0 ~1 [, R9 C) E
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
      ^& p1 J1 r  _; Z9 R! k8 w
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;8 @9 x+ Q( ~4 q0 y( g. u# Y" h' Q
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;$ e8 T4 S! s5 s/ }; Y
  101.   end;
    4 ~- B- q" Z  @! h0 P+ b4 c  }. I
  102. ( ?) p6 g; d* f, R4 ]8 \( V8 B! g
  103.   implementation% }0 w5 l, v) r2 a, K
  104. end.4 P- g* v- m7 ~  W

  105. 1 g% i" ]" v0 w% X. J
  106. Thanks & Reagrds,1 N+ I( r7 s) ^4 B- m5 }: A
  107. Mukta ...
    & m+ I- ?! Q: N1 G+ A
复制代码
  1. ) K. Z7 U6 V" U1 l! f: x
  2. it's work in Delphi 7
    - W* j9 e2 @/ {
  3. //////////////////////////9 q4 E) R; G# N% m9 H1 p
  4. 2 U% d5 X7 k5 n9 W! o4 B
  5. unit MMDevApi;
    7 l- G' z) U* M' k- k  N
  6. & A% c* T8 I% D+ D, ^- p
  7. interface
    6 {0 u# r4 t' _
  8. 8 \) Q0 w  X3 t5 N  L5 |% g' O
  9. uses
    ) N, R! G; |1 c# \0 X
  10.   Windows, ActiveX, ComObj;
    * N6 J# F5 `8 \+ `1 X2 L) K
  11. 6 W( C7 a1 s# i1 @* _
  12. const
    4 |' `# }- z; C) h) Y9 z8 |
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';5 [0 W8 j$ D! m+ U, t
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    7 w/ g% K( l: j1 _/ k1 j. k7 G
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    ( c" K5 r" Y7 ^+ d4 l% ?- Y
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';1 }3 H  ~5 }( }6 r
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';9 f+ u$ k0 P2 [0 l- w1 v2 t
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    * T) V$ l' q6 `# d: Y( _
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';+ ]) m& d0 A; @$ D" X4 O

  20. & ^  k, p& m! _
  21.   DEVICE_STATE_ACTIVE                   = $00000001;5 @7 I2 F, Y, R! P8 ]/ l
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    3 G& K" C9 r* w" e
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    + o/ t+ x4 D" d  k" k8 b0 S# i
  24.   DEVICE_STATEMASK_ALL                  = $00000007;7 }" `8 l( x; q3 d* R- C3 w
  25. ' f0 P/ S: \; R& k5 [" H/ i
  26. type" x! Q$ a; q; M2 S
  27.   EDataFlow = TOleEnum;4 Y* d0 X( s; j. _

  28. 7 R2 p! H$ Z  a% I! n1 W
  29. const
    5 x7 S0 n% t7 T* g
  30.   eRender                               = $00000000;: I* @  I% m$ y+ U' @1 t
  31.   eCapture                              = $00000001;* Y; w) w) [0 S2 n% @
  32.   eAll                                  = $00000002;* i& x8 b0 R4 c1 \) Y
  33.   EDataFlow_enum_count                  = $00000003;. w2 H" L8 O- Y- a4 Y- f

  34. 3 R/ E; M: h) W' V
  35. type5 U! s' v0 G2 s2 V, H
  36.   ERole = TOleEnum;
    & g4 v' w; w) \+ V/ |( R

  37. ! w( q1 C# c  C$ m8 s1 c( ^
  38. const% E! `4 g0 s/ n* k. o
  39.   eConsole                              = $00000000;( s3 P+ r4 f3 n9 X0 y. [
  40.   eMultimedia                           = $00000001;
    4 y! }6 `. H; @* n0 ?( c
  41.   eCommunications                       = $00000002;
    $ @$ d2 Y# K! ]; x# `- A. O
  42.   ERole_enum_count                      = $00000003;* c1 Z9 Q% ], m6 D* l
  43. 4 i( S! V7 Y- |- Y3 o* W2 [. g( `
  44. type
    3 U# O! }  h! g7 e2 s0 y3 t3 c
  45.   IAudioEndpointVolumeCallback = interface(IUnknown): a! ~. ^3 h4 q( ]' U- }) G. Z
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    / C  I, _) r2 g" e9 B; _
  47.   end;
    . m- @5 ]" t* e1 R. @# ^! |8 L& r

  48. 9 ^+ K/ M; @( l! C
  49.   IAudioEndpointVolume = interface(IUnknown)
    4 K% k! W( i' h
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    : u  n9 M/ L" U
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    1 R  v8 Y" w: L' C7 D
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    9 P0 G0 i/ p$ c2 u
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    0 f* I/ Z8 U- _3 g
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;9 p& {: m0 k  T( x- I' ]
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;5 p- W. t; h2 N% Q9 z
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;: ~# ^6 C6 [- z5 \
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;  h" L, `! Q7 y  V5 x' C
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ' B. R  c1 e% P7 Z
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ! s; [2 D; X; n8 |) u
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
      ?4 Z/ W) n. W" C% v# l6 ~
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;7 y" J. P/ Z) M# t& f
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    ! g  D' h0 a2 ]/ \' _
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    $ K4 J4 o+ d0 u$ c& m
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    4 G* I; r% H& e# ^! x
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;' C) t# Y4 N/ ]! q0 q
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    7 X. I3 ?5 W4 n4 R3 s
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;& a+ C1 z5 j$ Z  {: n
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;2 Y% b5 Q3 g4 [& ?9 U; P: S
  69.   end;
      c' |1 Y7 m% \' \' u
  70. ' L% F% Y% n+ n# i8 h* l% H4 z- V
  71.   IAudioMeterInformation = interface(IUnknown)
    , [2 H4 x2 t. c; h1 C0 Q5 m
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']0 p( \* g( L% P, m0 ^) X3 i
  73.   end;/ `* w/ q  p; t5 P4 f" b2 w8 g
  74. 4 u! M; A3 J$ D! Q7 k/ U
  75.   IPropertyStore = interface(IUnknown)* B# _- Z$ p( }" B( W, w2 w
  76.   end;
    : \& O; y  h$ a
  77. 7 Q) d9 j9 \$ p
  78.   IMMDevice = interface(IUnknown)
    + U5 _$ k  {; d% Z& Z
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']- R$ c: f. D5 u
  80.     function Activate(const refId: TGUID;8 W( W( k6 E& }& d7 g
  81.                       dwClsCtx: DWORD;" M+ [$ K' D% [$ z* S9 t
  82.                       pActivationParams: PInteger;
    ' `& y! E& l" A; B  N% c* W8 A
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    5 ~' g& Q3 U, v. w
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    & X5 d2 `$ |. X8 z, x6 W
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;/ K) U: }- K& o; ^1 F
  86.     function GetState(out State: Integer): Hresult; stdcall;8 s- j9 |& e/ @
  87.   end;" I! H7 P. E" ]. `2 v7 X3 D- Z

  88. 3 z; L% f4 A$ s+ B, V+ Z
  89. 5 k$ ~2 y$ U$ I. y5 y0 G
  90.   IMMDeviceCollection = interface(IUnknown)% Q' k0 ^5 A8 Y1 _! S. o
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    $ b1 f: e7 B+ d% {& q; P+ v
  92.   end;
    ) B/ C- T2 n( j

  93. ( g4 z: B0 d% Q
  94.   IMMNotificationClient = interface(IUnknown)
    , x9 m  U/ j; E1 d, K9 n6 l
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']/ b3 ^. R# l* O2 X( e
  96.   end;) |: P3 g- @; r" V9 H) v! \- l

  97. 0 B9 Y5 b8 r0 ~$ V, R
  98.   IMMDeviceEnumerator = interface(IUnknown)
    * s( _5 p1 R6 {) I- A. q9 ~+ X
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']4 ^/ q0 S8 N3 l% ]; S
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;: |* S3 I+ }8 H
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    " ~9 ]) k: @: w  U* i9 H9 w
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    1 N+ @5 A% a* w; o. j) W
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    * i1 ~4 W/ c6 W9 i
  104.   end;
    : S1 O% y0 S" U* K" ^8 M" K
  105. - J6 Z' p/ e& n4 `/ u/ d. M! D
  106. implementation3 i/ E; H# i. ?( _
  107. 9 g/ U8 a1 T) s- L. r! w. A3 ~
  108. end.
    3 B. {; E+ e, A: g; ~
  109. * t: D1 W; a- H: V! n
  110. ///////////////////////6 S# v, N# u3 y; V' L& T  z
  111. simple sample :)) C) K! G& d- R# u' ]  e, i
  112. ///////////////////////$ N3 n( Q- e7 w+ w. n. V7 N
  113. * \2 s5 Q! X% |7 Y4 |
  114. //...... other code
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  115. % r, T5 S( i) q2 l
  116. uses ... ActiveX, MMDevApi, ...;  P8 ^8 ?/ N" B" J+ X2 i! Q" G8 `1 q

  117. / H2 o6 g3 ~! C0 {
  118. //...... other code
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  119. % h" k, E. F" p' r5 S
  120. var+ m$ Q/ A$ q1 k9 w3 E
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. & q5 E$ b  ~8 K5 d# N1 W3 ]
  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;! b9 J, Y0 \% W: f! `
  127. begin
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  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
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  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;* Q" S2 q' Q! N3 d1 V
  132. 9 G7 ]" ?; k  V& U) U5 n4 t. v% A
  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
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  137.   if endpointVolume = nil then Exit;9 Q& q' Y' o5 N  h# z4 d7 w  ?% s
  138.   VolumeLevel := 0.50;9 V& ^- D5 ]& b3 W! a
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])0 P- F, C9 ?. y) Q2 P- C
  141. end;
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  142. : R) D4 j1 S+ B: F7 R3 J$ g" a
  143. /////////////////////////////////////
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  144. ' u+ b; z% n3 C" q# y
  145. // with best regards ToxicDream
    ( O0 J. _# O: W/ v
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