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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-a8c9-2e27eb9ec0582 u% t, ]% F/ T. A7 {8 b; E
By Mukta & ToxicDream

  1. / T( n* _/ R! v- _) P4 p
  2. //for delphi 5
    2 U. R, x; g  y7 S7 n% j9 w8 _$ G. ^
  3. unit MMDevApi_tlb;
    " c  w& H3 o5 R4 b* @  K: H+ j- l

  4. - r8 u- Q6 Z- k! T
  5. interface
    ) Z3 i2 e* }6 ?$ x4 P8 `( ~
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;( ^5 _* h* ~8 E9 `% H
  7. const% ~6 z$ D1 Z0 h  Y; Y
  8.   // TypeLibrary Major and minor versions
    ; E( N8 e* {) K7 w- w- C8 ]

  9. , D1 ]0 a- I  W1 O% a0 @, r4 a
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    6 K* Y6 O0 q6 K
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';' P* ?+ X7 ?/ u. K3 q0 h" w3 Z
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';) w, K2 Q' n* O; Z, m) K
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';5 \0 h0 n3 W+ I/ |9 ^; i" |
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';1 \) r# H: q" P
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';& J$ q8 C7 t* Z2 Q7 b
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';  t  s" I8 `& _. T

  17. + b) Z, ?6 _: E+ }5 D& q
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    , M/ M5 E$ H, [( X
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;5 B6 U- N, c$ N, n% w& k
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;$ {$ A! ~1 N6 c5 ^. J: E
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    : a; n3 O4 O8 M9 _4 V0 ^" C

  22. ' J7 y0 c: ~% D1 m' w
  23. type
    - m% J5 \2 u. r. K8 J4 v
  24.   EDataFlow = TOleEnum;
    . V: R, U) g& _& b2 X5 Q' F
  25. const; j( p, p% M3 i0 X
  26.   eRender                               = $00000000;2 G. o9 O) Y- f8 q4 _% T
  27.   eCapture                              = $00000001;% e7 r, ]& x) q: }. N+ C) |: b1 G* i
  28.   eAll                                  = $00000002;4 w" ^& N- K) ?6 E: I/ M5 ?  n4 y! K
  29.   EDataFlow_enum_count                  = $00000003;$ c( S4 h% P- \/ g' o" B

  30. % j0 Z+ F: q& I/ J* V+ W
  31. type
    0 c9 @  i7 K" W- B; X
  32.   ERole = TOleEnum;
    8 p% g5 e' F( U$ r9 a% u6 a2 \* W6 q
  33. const
    4 u, R: }; |9 M0 G& ]
  34.   eConsole                              = $00000000;
    ! [/ G- ]3 v/ x' h2 t4 d  M% y
  35.   eMultimedia                           = $00000001;+ D7 h7 m4 _0 u- ?( T& J7 H
  36.   eCommunications                       = $00000002;
    8 m" d3 m: n& @3 w6 [2 @5 F* d
  37.   ERole_enum_count                      = $00000003;5 {+ ?& W% |) |: o. x
  38. 2 k  i& m- I% V! _
  39. type2 M: q7 y8 q) W: E* A* @  g
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)# V. A( y7 X' z) S! B/ L7 u; J
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    2 a4 Z9 {" @. @% ?# f+ z
  42.   end;
    9 j( V3 d5 f' @! c+ \4 e" v0 Y
  43. 6 y2 V5 D: ^8 F9 K$ e- K
  44.   IMMAudioEndpointVolume = interface(IUnknown)' }# h1 M5 H; r, ]/ o! P0 o
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    6 X; W$ Q6 x) d2 s6 _4 p. P
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;0 B& H- q! b& |7 J; j, z
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    7 ]  z! N9 _2 x3 p# X; P
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    ) R0 f. K  h( @
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    9 y9 T, @# z, H3 {9 @. C
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ! a: N9 W. s) F* h) m  Z" w1 w
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;- O+ v! ^7 P& L' k) S" g
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    & H5 j$ b# g0 y1 k& P1 p
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    . O9 V% L" b4 \' U: S' a( K
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    6 C9 p; f9 m" C9 m
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;2 _8 E% p# s, H  e4 }  `5 M
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;* v% G& f2 z3 \6 J- y' J' @6 I
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    # I8 n1 |  }: W# i
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    5 c: ~7 T- C$ j/ F* O: A9 |, ^1 H
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    * m7 ]1 u( u2 k7 v
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;9 [  W- n, ^& c- ^8 G- Z
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    8 J8 Q( S: }4 A2 I
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;" U' O% G& u" h$ z1 R- _
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    - v8 X! t' ]( c4 n$ @- {- H
  64.   end;& o) S$ h$ x: l( f, f2 d# I8 K
  65. 4 [# q- d: r, o) r+ ?) r
  66. {  IAudioMeterInformation = interface(IUnknown)
    $ A- Z% f! m/ D6 R9 ^
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']! k( |7 Z8 L+ H' h
  68.   end;}
    0 v6 y' b& B2 y& P$ e! d$ |

  69. 7 H. [  O& d9 q
  70.   IPropertyStore = interface(IUnknown)
    - x7 W6 F2 X! _. H- h7 j
  71.   end;! Z! b, H, j9 ^5 {1 s* ?) T7 Y

  72. * k% }3 d2 R0 A4 x' c$ @
  73. type9 V" k3 G  s# P( h) f9 K5 U) Y- A
  74.   IMMDevice = interface(IUnknown)) O! y2 P1 M; t+ {+ ?* Z
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    0 W0 a; m3 J3 R
  76.     Function Activate(  refId :TGUID;
    : T9 r! G5 ]7 H8 J
  77.                         dwClsCtx: DWORD;6 L1 m1 f2 ]- D. v9 F
  78.                         pActivationParams: PInteger ;$ q/ H1 l2 i2 `1 U
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    $ `; w1 T) [: q5 g
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    9 c9 Y+ w3 ]- B4 L3 s& k* q* W+ k( F
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    0 n/ m9 F. e6 @% j
  82.     Function GetState(out State :Integer): Hresult; stdcall;' T! a- x+ x0 U& F

  83. 1 Q- g: d" |1 r5 e' G' i
  84.   end;8 O0 X5 V$ F; A) {
  85. & R) B% x: @& ~8 z
  86. 8 S' G+ o; V2 S) L* o
  87.   IMMDeviceCollection = interface(IUnknown)5 }" W$ @4 _2 C2 P. M
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']8 U! E' W0 Q; i' J, @
  89.   end;2 E- W1 {( g2 X/ |' Z
  90. / u9 R$ A; i' K- O4 L: k, D9 H0 ]+ b0 G
  91.   IMMNotificationClient = interface (IUnknown)
    6 q, o% K, W/ Y/ J# G
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']3 e+ f; j% c5 b7 z/ s, n
  93.   end;
    4 F/ i0 R1 B9 m8 H
  94. 6 t: d" t) F8 O# d" @& B
  95.   IMMDeviceEnumerator = interface(IUnknown)  S0 z# U7 D: @3 C3 c6 _
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    ' g$ k8 i% z& O
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;" H# S; F5 i) V6 Y  C& A
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;+ E% B' b7 M3 ], ]
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    * j2 i: ?1 R/ k3 k, X7 K# D& F4 d
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;+ y7 o9 u: T" E( U9 j. ^
  101.   end;4 {; R+ ?+ O# z! _4 o$ J; U

  102. 7 H$ n+ ^0 R) X1 N7 C( c
  103.   implementation
    ) B6 P' v7 L0 ?
  104. end.) ^/ i1 A  [( w
  105. ; F  V" S# K: [3 u3 J
  106. Thanks & Reagrds,
    / ?2 X/ A6 R5 |* k: y
  107. Mukta ...
    2 M$ V$ V  x0 f4 u2 ?5 {7 B  @
复制代码

  1. 0 V, y  @0 l: J- \
  2. it's work in Delphi 7- j' E9 o# m) D/ B) h
  3. //////////////////////////
    2 a2 a- S/ y. H4 S" j

  4. 1 |" D9 `: ?4 }; x+ P: K# O
  5. unit MMDevApi;
    2 e. F7 v8 N4 u

  6. 7 N0 ?; u% p' _: z
  7. interface& q4 j1 C* m  w. [
  8. , U2 e" g" F) ?8 p& d; a' m3 o) V
  9. uses
    ) U" d# ]" n9 D* r) f
  10.   Windows, ActiveX, ComObj;
    ( d) }5 N* s& F$ n0 G( f! m6 D
  11. + @; n9 ~  t* Q3 i
  12. const* n5 f% ^1 w4 a7 V- l0 X
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';  i; b$ a9 V& X5 D, D/ w7 y+ Q4 w
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';6 h5 e  ~/ m- w' l
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';0 {' Y* I% p9 `5 u5 M
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';( A1 j& [$ P! U4 A, o
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';0 M2 Q" z3 D6 i& o1 }8 f
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    - \# Z9 @4 o1 V7 z0 c
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    : \7 e# V2 M) s' R
  20. & b/ H9 W  z" P/ t8 M/ i* g0 [
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    $ e/ p- t/ Y: S8 T- o3 U4 a
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    2 N- [4 T+ h1 p0 c: v
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;  L" ]5 V' N, N9 q/ n
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    + ^( \) T6 j9 L- R& I

  25. 9 W& V4 r! |1 c8 @+ s* v, T; C* o
  26. type" I+ R* p3 R9 R. k
  27.   EDataFlow = TOleEnum;- H; x6 O; L! ~6 R

  28. " X. y3 m- B& ^' C8 O* C, S
  29. const
    # U8 c) {  G# ^4 x6 N; P
  30.   eRender                               = $00000000;$ o" A  S: x5 w; n4 ?
  31.   eCapture                              = $00000001;, |: `# s5 O9 w+ S8 l- H
  32.   eAll                                  = $00000002;, d* s# w5 A8 X% h/ T% X. u+ {2 {
  33.   EDataFlow_enum_count                  = $00000003;
    - q1 ~: G; I& Y3 J9 x4 o
  34. 6 S; v; F  f$ k( o" e
  35. type
    7 X0 ^* [# C: L$ R) h
  36.   ERole = TOleEnum;
    1 Y% f: @0 ~4 x& s# J

  37. & o; Z* z. v+ z  c- c
  38. const
    9 [4 b1 h/ X1 f8 z3 F
  39.   eConsole                              = $00000000;
    2 z4 |: H5 l# M) }. ]( D' u8 v' z) e
  40.   eMultimedia                           = $00000001;
    0 v- L, V% m: s4 S  Z9 @
  41.   eCommunications                       = $00000002;
    / @1 P9 K8 ], g  r: ?6 \
  42.   ERole_enum_count                      = $00000003;
    & ?" J6 j; F8 r' g: T( f  H. [
  43. ! w2 O. Y9 Y0 w) v& t' D
  44. type" u8 V. x# G2 N3 I2 o
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)) W% M9 c. n/ ]# F5 l2 s- B. c( e
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    $ R/ F8 D5 G- ?
  47.   end;4 W6 x; f4 l7 I' m1 ]3 x" D( ]3 l
  48. & n" K0 L6 m* \! D* z1 U
  49.   IAudioEndpointVolume = interface(IUnknown)
    " D8 z" O- O$ a
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']2 i( e( l/ F# r% G1 c
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;& y6 N$ g% c& X3 d8 X$ C
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    / E, G8 N" d9 O& c: {, u
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    ( H  t% q% W( c
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    4 ?8 S" J' `% C1 T; ^$ [
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;* q. J2 U" I1 ^$ X; x0 Q" c
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;; P6 L& A4 x8 {8 A/ ^
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;7 `0 }' L0 Y% Z/ M3 W! a2 D7 V& }
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    1 F/ {6 A/ a  G
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;. z1 b0 i# O/ @9 Z! @
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    7 z  ^' c& r/ i  [
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    " z; ^; |/ ?7 ]# C9 |2 z& g' O6 A/ T2 _
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;/ g: @- ~# M6 T" y1 h( M- |
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;, _5 o. r. v2 @8 d" r
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;% b7 Y0 u, Q2 ~6 n# w" g8 H
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    / r0 x# `  M# R7 \
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    " \, [* I. w+ I7 Q3 O
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;& }  D" E4 h- ]4 W" @9 v# U8 u
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    9 @2 w8 K& U- M! h$ F$ X6 C
  69.   end;
    5 X1 h+ A5 q" m4 t' q! L5 P/ w2 |
  70. ( E4 k% O0 I) x7 }$ H
  71.   IAudioMeterInformation = interface(IUnknown), X8 s7 K' x3 I- T! c' `
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']/ w5 D/ v' P1 \
  73.   end;
    / R) N* d& P7 J1 X1 x6 I
  74. 8 w2 Q* ]9 e! U% B% l
  75.   IPropertyStore = interface(IUnknown)6 {' X( s6 A; u# Q$ X& X+ [
  76.   end;
      w; @/ D5 g; L& Z: d
  77. 4 p2 ~1 B/ E& R. F) p- n/ A
  78.   IMMDevice = interface(IUnknown)3 X7 e2 Z1 H0 F$ {7 W
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']( w" M  p1 s% l' r0 Q1 ~
  80.     function Activate(const refId: TGUID;
    0 b* T8 f, z+ o+ V& ?" p+ @
  81.                       dwClsCtx: DWORD;% Y( _# j  R; l* N/ Y, B
  82.                       pActivationParams: PInteger;
    ( [! K  s. D5 W, Q8 v7 O
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;4 c2 }4 q" j2 r6 Y- m
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;+ L8 V0 I/ F+ i+ I. e1 k9 A( l  f- j
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;* D6 u# q, A; t. ]! s
  86.     function GetState(out State: Integer): Hresult; stdcall;& k( [/ B8 ?* ^6 @7 U4 ?3 P. e; A
  87.   end;0 Q' _& F( i/ n9 v. J" `5 _
  88. : E' d; C. e0 E: v/ p3 O8 V
  89. 1 l1 V/ o- h4 f  E3 E$ _+ ^
  90.   IMMDeviceCollection = interface(IUnknown)0 ^- h- k5 A" B2 X  X: v
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']/ Q/ Z) u, K4 ?5 B4 x6 _
  92.   end;. b) [7 W  W8 ]& g% p
  93. $ `! h2 u7 P& C+ G
  94.   IMMNotificationClient = interface(IUnknown)
    6 K; R* ~5 J6 y. y' n; n
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']7 |! T1 r! e' l4 P
  96.   end;
    . n. u. f5 f- Z

  97. " L, m  k# Y+ X" j
  98.   IMMDeviceEnumerator = interface(IUnknown)0 _; a9 @9 X. J- ]; z/ j8 Z: k
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']. _, j$ m& @# V8 p: O
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    1 \  y9 Q2 p0 t; W
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;/ q9 @; l$ A/ o+ |0 n  P
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    * Z# V+ m+ |( t' U% o/ i" v* `
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;3 f! G2 e6 ]; p/ O' X  x: l
  104.   end;3 l4 ]! Q' k: X+ |$ E& m

  105. : ~: O9 d3 M- p* }
  106. implementation
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  107.   A) }0 S) K1 L5 v9 s  h, {
  108. end.# v: S: J1 P* z! o9 E' k
  109. 7 N. o+ y' ?* I3 s, Y( [" o/ @
  110. ///////////////////////
    ( i0 ], ^0 g! [7 c  s  P- b) |
  111. simple sample :)
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  112. ///////////////////////5 @5 S; l+ _) Q$ V

  113. . X6 N% C( ^3 h
  114. //...... other code& ~7 o  ?9 N0 g) c; v) g

  115. - L0 c+ y$ X; Q6 x. \+ N2 P
  116. uses ... ActiveX, MMDevApi, ...;
      r# ^, @  ]; }0 l% f7 e
  117.   t2 T, q% S3 L  }+ S
  118. //...... other code2 N: |) t5 [% N

  119. ' p4 @; a6 ~! i1 I! E% |+ {
  120. var
    / p$ H; C8 c6 s, b" z' n
  121.   endpointVolume: IAudioEndpointVolume = nil;. V9 V# {! r. I) |, F* }
  122. + |" w: |2 W8 N% [0 Q- j6 f5 W
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var
    1 Y) a+ d! U: E# {+ H
  125.   deviceEnumerator: IMMDeviceEnumerator;0 I' H& q% g: V. }* ]
  126.   defaultDevice: IMMDevice;: v- f5 i! [) V/ V
  127. begin/ d' ~8 s0 C3 D
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
    3 {( D- `3 _$ n- l1 Q
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);( A7 s" o# E3 }& N2 b) d0 D; f6 q9 ~
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);* B) h; F! x! a& Q# G% g
  131. end;
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  132. % `2 K7 e6 X( H3 f, t! @2 d
  133. procedure TForm1.Button1Click(Sender: TObject);& _4 n) O7 q4 s6 q
  134. var& V) l1 g% M7 D% h
  135.   VolumeLevel: Single;
    , q9 u1 {/ O! I' {0 a
  136. begin
    ' q1 k6 H! N0 c( }1 }
  137.   if endpointVolume = nil then Exit;3 L& ^  n( B  s- g+ {. y
  138.   VolumeLevel := 0.50;
    # `  s* v  X, K3 j
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    ! p3 ~& [  J$ I
  140.   Caption := Format('%1.8f', [VolumeLevel])* h; c$ G/ q5 g. o9 x
  141. end;
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  142. $ ]$ g- m% Q: ^- U
  143. /////////////////////////////////////8 l3 D6 o' D4 x( p

  144. : L4 W" X4 p. Q# b% n. D" n+ `  _
  145. // with best regards ToxicDream
    ( o- g: A& w# p# ?2 d1 J
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