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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-a8c9-2e27eb9ec0581 [. w3 j! c- ~0 l$ m
By Mukta & ToxicDream

  1. % T8 v. x" |' Q% p- S
  2. //for delphi 59 x. |! D/ U% A: ~* }
  3. unit MMDevApi_tlb;2 A, C- c$ i; L; L% p
  4. 3 [2 n2 N/ h! x& b/ u$ e
  5. interface
    " X  `, J9 h: Q2 m3 p+ J- H
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    0 S/ L$ j0 `) a/ D# B
  7. const
    & }, r2 {3 y% q1 x
  8.   // TypeLibrary Major and minor versions; U- M3 x; m1 k

  9. 7 Y. B8 e. n* Y' c. t
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';! y% t% R( n) N! J5 G
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';; _7 S( }4 i  c8 G
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    6 j# _8 B# }0 }" ^* S% f
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    + E$ I6 k6 v1 d4 v" g
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';- r+ b: H# a+ P; [5 p7 s* z; u
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';1 z; W) V# Q$ O7 P9 `: G# c1 l; u+ ^
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    ' Y( P  D0 I# q% ?. v

  17. 1 V; i, N% m$ T# e* S5 X
  18.   DEVICE_STATE_ACTIVE                   = $00000001;+ d2 t. T7 P6 }) f
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    % \+ ~% J' }7 r
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ) J# g% U8 P4 G4 l, F( I
  21.   DEVICE_STATEMASK_ALL                  = $00000007;: f- n2 z/ G6 _( s  G

  22. % d' I" a; W% L2 X$ E: z
  23. type
    4 i% |! e& G6 G, \3 K5 w; _2 o$ m
  24.   EDataFlow = TOleEnum;
    9 Q2 G7 w3 Q- |) |* F1 w5 w, W
  25. const
    " h  C4 [$ n+ @4 c# }# D
  26.   eRender                               = $00000000;
    1 g8 O4 s/ f' h
  27.   eCapture                              = $00000001;- e- D7 X% ~4 }) c3 m" k( W
  28.   eAll                                  = $00000002;
    % H% B  \$ Q+ S. P8 ]
  29.   EDataFlow_enum_count                  = $00000003;
    7 {. x( J4 }3 e! @" ]

  30. 3 N( e* P8 q- Q( `2 ?# O
  31. type
    : t6 l+ [3 n* u& o
  32.   ERole = TOleEnum;3 v9 S% W; y9 G: F" Q6 \
  33. const" C& s2 K* r6 A
  34.   eConsole                              = $00000000;6 t7 s1 n+ w' z, S) S& q4 V2 L9 K* v
  35.   eMultimedia                           = $00000001;
    / z* `4 V* x: R2 C0 F0 l
  36.   eCommunications                       = $00000002;2 d7 ~3 K$ V; l# [/ O, Y4 C. ~
  37.   ERole_enum_count                      = $00000003;
    5 h* |1 ]9 {. n' u; C; x0 P- P! T
  38. 5 s1 ~" k: F+ O  T, ?
  39. type+ p- Z' x* t; R) `3 |
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)! n: v. l3 _3 c/ ^! ?4 j
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']' Y8 s! S9 R2 C7 F1 N7 N
  42.   end;
    + W' i9 C$ z7 S  f4 I- r& x
  43. 8 G5 X3 {3 D7 o5 Q
  44.   IMMAudioEndpointVolume = interface(IUnknown): z& G& x0 R' W; z8 G
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    ! f) h  D7 Z3 C
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;: I4 ]: s4 \1 e
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    3 x* B% V4 z9 t- F, D$ w6 B- o- X
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;/ Q- h* z% R6 F2 a2 z
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;4 P; y2 R6 @7 q: e
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    9 t4 O  l. j' }$ v- }  y6 S
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    ; Q( H6 b# n* M& R6 t3 e
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    5 c0 n$ Y& r- s5 T  U
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;" t! s% y6 g/ X- \, d5 f
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;' F$ b. c7 o/ L$ \( P8 L8 X4 M
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    & L. j4 e5 C. O7 W6 {* p" w4 ^. q
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    % |' c% ^7 _. K  V- `) k8 }+ j
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;( c% P0 i- {1 a' o7 T6 c
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    ( j5 u/ U' [# E; v: y
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    8 K' V% @, R5 \# ]7 }* c
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;$ l% j& x" W' y  V% g, b+ s
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;2 @1 ?1 x$ x6 S" L" X! q7 r) N  a
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    2 c/ {9 j( t" l
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    0 }( ^9 S% {+ _& `" r  d4 q* `
  64.   end;$ w$ G. w5 G" T, U6 X: p0 |
  65. : t; e8 e2 T% ?: O5 S7 l
  66. {  IAudioMeterInformation = interface(IUnknown)
    ' u8 X3 x6 i0 f% M6 J1 ~
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    ; P) W7 J7 L& a2 Q! J9 k$ _
  68.   end;}, I- [8 C+ D5 @
  69. : n' ~  x5 e, z& k! h
  70.   IPropertyStore = interface(IUnknown)
    * d1 O* S, J5 z5 @0 H
  71.   end;
    5 N- }' j5 x+ [5 z

  72. * L1 K6 o- n% T
  73. type
    7 g+ U2 R' r: ^
  74.   IMMDevice = interface(IUnknown)% s( `, Z0 \3 D0 D- |0 p: G
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    * J8 Y7 A" T* m, ]" l9 A
  76.     Function Activate(  refId :TGUID;
    5 l; n7 X: t8 l/ Y( P4 |; M
  77.                         dwClsCtx: DWORD;
    ) Q/ D+ l" p2 w' t; ]* w/ I
  78.                         pActivationParams: PInteger ;7 P/ M1 h6 t: F1 T
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;: _  I8 J7 J/ y* X1 l) y
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
      L) I4 |4 z$ X3 N$ h
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
      y0 R0 `8 [8 H/ g: s) x. x& Q
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    7 M# U* f& F: ?' n+ S
  83. 7 D% `9 I/ l; ?
  84.   end;
    + f$ C' c5 [7 v9 x' @
  85. 0 G' ]1 L! N6 M+ U, |

  86. 1 I8 r" `6 y* f$ M7 q+ Y
  87.   IMMDeviceCollection = interface(IUnknown)8 ?7 r$ N! U3 ~, A
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']  D. Q. t0 m  E+ ^1 k) W
  89.   end;8 t/ X& I6 M8 ~2 u  i# j9 C

  90. 9 y& V8 M* z, [8 ?
  91.   IMMNotificationClient = interface (IUnknown)
    % ]( \, H( w7 r7 [4 Z- _" T
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']( A! a& ?% I. g
  93.   end;
    0 |0 n& Z% H: s' x" Q

  94. 3 ^& R9 U/ z4 i, q' S9 ^; k
  95.   IMMDeviceEnumerator = interface(IUnknown)6 _- |; i+ _; ]; i# x- m$ b; T1 A
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']+ A4 ~8 J# r. e; R9 Q7 ]% C
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    + L# \: H* f. Y% m- [' y
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    ) h, I" ^5 W& t: R8 K3 s: ?9 @
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    - t. x, n, v4 n$ G' Q
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    : V; C6 _5 e1 \5 j/ T5 L
  101.   end;
    , i/ d) a8 B4 f3 w

  102. 9 v) e- z2 i0 q( K1 F/ r
  103.   implementation& u. g6 R( q: R
  104. end.
    ; O8 V7 r: O0 |/ {' r  U- j5 }
  105. 7 c, W9 J, G$ [
  106. Thanks & Reagrds,
    : X. x* o2 {6 _. M# a0 W& Q4 e' L
  107. Mukta ...
    . Q- A5 Z# n' B9 u! B) G* t
复制代码
  1. 7 J: j) h3 t# S% O
  2. it's work in Delphi 7! f! b0 g, {5 r; J* {6 `
  3. //////////////////////////1 T/ k( A' w% d; W& |0 m
  4. ) W2 C) ?" A& _$ H+ M2 }$ u
  5. unit MMDevApi;
    $ E# X: a7 T9 }- G
  6. 2 r6 g( C# L* r
  7. interface
    / N7 o) m* S+ l  y$ O

  8. ! w$ `" s; n8 P
  9. uses- A3 q9 \3 o- {! }$ x3 N+ p+ o9 y1 a
  10.   Windows, ActiveX, ComObj;. y& p; ~/ z: r

  11. % p- r. m& d" ?4 s1 {3 i/ ~/ W; W
  12. const
    6 L: ?3 g3 c/ H7 u. o8 T* X
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';. Y# X1 L7 v9 g! n0 Y3 i* L
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';) Y( Q* f# a( B+ m4 _: l# h
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';2 _4 x, b4 u0 B! Z. N; j
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';* @5 ?! m, r! z) j! u! N
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    . Y0 f0 `" v6 E: F3 L
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';# @# b: W# Q7 S6 _0 R% m
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    + q* M! O$ L; Y- }, Y
  20. 0 s3 \0 i; y3 \6 T
  21.   DEVICE_STATE_ACTIVE                   = $00000001;7 K# e& Q" T9 t6 e# d
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;! a4 R" P' K/ k+ B( j* [
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ( G8 E- }' U/ b4 ^* s! w( n, F
  24.   DEVICE_STATEMASK_ALL                  = $00000007;% Y& X# ^3 \) s; \9 U
  25. ' |) `9 F: G; E4 U7 u1 O% w
  26. type% i! I7 F* r, R$ N6 E
  27.   EDataFlow = TOleEnum;
    # F) s2 e' E% a, @$ ?

  28. 4 s. X2 E- i( Y
  29. const
    0 X6 X; u& u" ]2 U  G! M
  30.   eRender                               = $00000000;! {) f3 e; X2 q. V, S4 Y- {, v/ a
  31.   eCapture                              = $00000001;- X5 o- g% f* B) a
  32.   eAll                                  = $00000002;5 R& F4 K4 `6 d' O
  33.   EDataFlow_enum_count                  = $00000003;
    6 Z/ k# Z& b* U, B3 Z% ?( p, O

  34.   ~- Y( c- @: u7 f$ U. B
  35. type
    ) G/ C/ }9 r: O5 e4 m
  36.   ERole = TOleEnum;
    ; Z. s/ C, x9 ^$ z7 W
  37. " Y4 a. e! c+ ?
  38. const4 z2 r/ M. w* r
  39.   eConsole                              = $00000000;2 {# _' T! `# Y; J2 P) H( H4 L
  40.   eMultimedia                           = $00000001;& X8 d1 k7 c4 U$ U
  41.   eCommunications                       = $00000002;
    ' x2 U& D& \: z. l; K! C
  42.   ERole_enum_count                      = $00000003;
    ( U8 \. V+ t" {: l! i, ]
  43. 1 X" R4 B( ?% {% a+ Y
  44. type- n- o- w1 v9 {% L  U
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)4 Q! n+ }3 Q! n( G2 ^# k
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    * I  c" S/ b0 P0 ^! G
  47.   end;
    , r" Y$ M  }1 }) J
  48. : w) \7 E' A( P8 X6 y- f" A
  49.   IAudioEndpointVolume = interface(IUnknown)* E0 D, h5 z$ e# m
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
      }) A% `* W0 O2 c6 D: E/ G
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    / D) v6 P1 T9 c( z3 K; ~2 h
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    1 v% d4 v( B  B, Z" S# Y
  53.     function GetChannelCount(out PInteger): Integer; stdcall;2 K  I. }" k! D0 t$ I1 S
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;7 B* c- O) |" R) I& T
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    + l+ [. Q, O) h
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;! Z  a) H  ^# F/ I7 I! ?
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    / B: n3 ]2 e$ O1 b# K
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;, ?  ~7 I8 \: u3 z
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;$ N- t: Z+ q# U2 V
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    0 i8 f0 i1 N/ {9 \" s% Z0 T7 b, G( g
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;: @8 `7 N/ z2 |3 m( d" F4 C1 F$ E+ Q
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;+ A+ o: K1 ?( e7 e8 t' S$ F
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    4 S0 r7 _; N( O5 @6 G" t
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    * z1 ~  @, S! Q' ^+ D7 V! j/ K) c
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    6 e# E1 y0 S% |# Y; E
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;3 J% F# R; i9 U. H$ o7 l* E1 P
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    # N0 \: e1 ~1 C6 x- h0 U
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    $ F$ V6 w: s4 ?" I
  69.   end;/ r8 F* a$ I1 K; Y) G: a% v( T% u

  70. - \9 ]6 }: r$ U- L' C
  71.   IAudioMeterInformation = interface(IUnknown)
    : p: [! ]# b$ k' c+ ]) B. b" [: }7 ~) @
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']& e/ u% ?9 g6 ~8 F  m% K# ~1 a3 K
  73.   end;  R+ f7 w7 ^- }6 ]2 H3 f

  74. 6 R5 [5 ]% U' V# t( T
  75.   IPropertyStore = interface(IUnknown)* ~- k2 X7 u' [8 `: |: Z7 ?1 P0 y
  76.   end;
    8 s& P& [$ t. r$ E% z" `/ f& ^

  77. + Q9 u, N- e+ T' m
  78.   IMMDevice = interface(IUnknown)
    2 D1 v3 w' O4 H3 c: I, M& j7 y
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']3 I" K$ y* f1 E- f0 \. p- l
  80.     function Activate(const refId: TGUID;
    ) `' D& z. N. r+ u5 A3 k
  81.                       dwClsCtx: DWORD;" w! a7 P- l9 N8 p) u1 P+ |
  82.                       pActivationParams: PInteger;. r, D0 I4 a" ~5 H# K
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;6 Q1 ?+ j* E" X& n2 R
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;4 D. _" d& V: H. `
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    9 i4 R4 C- M9 q' ]# J7 f
  86.     function GetState(out State: Integer): Hresult; stdcall;3 a! B! ]/ p% u( V
  87.   end;
    8 i3 ^; |$ u) e$ p& r, G
  88. , c  }5 ?3 k3 H7 h9 M% M% `" `
  89. , A2 s# V( ~3 ^) H
  90.   IMMDeviceCollection = interface(IUnknown)* O! }6 \$ l$ E/ ?% E
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    : ]7 R1 I& L' M9 }: Y
  92.   end;
    0 r" W# H* {4 R2 f" |, `# h# E
  93. & M- ~; @/ j! ^; o
  94.   IMMNotificationClient = interface(IUnknown)2 ?" ]. O, A; Y) v
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']. z  O; c) Z! b: j& z. S
  96.   end;
    # F1 K9 J8 H+ m

  97. ( s) d/ o- K4 [9 J
  98.   IMMDeviceEnumerator = interface(IUnknown)
    8 @* J( j( i+ Q: O5 h# `! i3 Q
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    ! X5 K0 L; V6 ]$ h, B8 |" \( W
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    9 P9 m9 W; f' x, k  g
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;) H$ Y7 e$ c: y: w3 ^4 E! f
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    2 b* N, H0 Z7 `, W) O! R. d
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    & y" Y2 a" I! G2 J! j2 g) h0 \
  104.   end;" ?7 E  G; @4 Z# ^

  105. $ h  X5 A) M! C, l+ T
  106. implementation& |9 V9 z# C6 E2 q; J( y6 W9 e

  107. + Y6 J* i/ b! U/ L7 S" Q* c
  108. end.# D8 L% Q& W: }) ?4 }
  109. 5 X9 n" w+ B: A
  110. ///////////////////////
    8 E( V6 Y; I! Y0 D' A# K' U
  111. simple sample :)
    " s" b  M, U$ B1 A* l: M
  112. ///////////////////////
      q' Y) }5 P' w( F4 {
  113. 3 v- b. P3 O  K- P9 I
  114. //...... other code3 e* z: M% F+ |. i* |* N- M
  115. + ?+ D+ Z( D% @7 w: c/ A% P
  116. uses ... ActiveX, MMDevApi, ...;
    + U, p& @3 `& I. t. s, w
  117. 0 l, y. P- ^: d# b
  118. //...... other code3 d. o- u. e7 a

  119. 0 K) a/ X! F) M5 z
  120. var
    * Z. w# a6 Y( N9 a5 u1 K8 p7 N
  121.   endpointVolume: IAudioEndpointVolume = nil;
    3 }7 v- g! X. N

  122. + I5 L; E& p& J; S
  123. procedure TForm1.FormCreate(Sender: TObject);& B+ S% @: e) o6 L* M9 G
  124. var- N; y; a5 f( g4 f: ]$ n* n( k
  125.   deviceEnumerator: IMMDeviceEnumerator;
    ) i  ~8 \% ~0 c' W' f
  126.   defaultDevice: IMMDevice;. U% A8 e  X4 Z4 r7 k5 d) v
  127. begin$ c" f* R( N( e- _/ K. h; |( `% X+ w* m
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
    8 p: l; x0 T  ?/ V1 X$ Y" l
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);& J+ c. ?5 `7 X5 a( I
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);" Z- G) k: O' |% d3 e
  131. end;; W4 m* u  J1 z

  132. : f- X( N2 ?6 x5 \+ S
  133. procedure TForm1.Button1Click(Sender: TObject);
    9 i% L/ E; v8 {3 w2 A3 e
  134. var% e& Y! d$ }4 `* I2 K, g/ R
  135.   VolumeLevel: Single;
      z  E% s) _# E# W/ }0 [5 ?: w& p
  136. begin4 I; J/ ]3 P  ]: ~& t0 m
  137.   if endpointVolume = nil then Exit;& I' c3 @" W' j8 X7 R: M& S+ T
  138.   VolumeLevel := 0.50;/ Q3 _. L6 R! N- E! j
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])5 V" m& K2 M" u% a1 p( O' ?
  141. end;3 ~, c7 X) K( A2 R
  142. / Y) H5 Z* n2 A8 r  S( B8 Z( p
  143. /////////////////////////////////////
    4 e! k4 x! B* \/ @$ p$ q

  144. " K1 c; P" S3 J- G
  145. // with best regards ToxicDream5 Q$ U/ R! l, i! @5 n$ @
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