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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
, y. H( w) O+ a& H0 |1 w5 c5 o: `By Mukta & ToxicDream

  1. , e1 J5 q" h: v
  2. //for delphi 5
    7 r+ n' R7 }' w* l; h
  3. unit MMDevApi_tlb;) N8 h9 F7 i: v9 E7 l3 Q, N* a. T
  4. 5 N# L% H; o- X! V" Y! v
  5. interface4 e: G4 i9 m* ?* F
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    ; l6 T; e# ~. P
  7. const# k+ y% {% g1 ]0 O* R5 _
  8.   // TypeLibrary Major and minor versions% t0 k- q; L- u/ P5 @; b- C* P: d3 k

  9. , W2 J, W3 O9 B
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    4 k- ]5 r$ v$ i( ?
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    1 `" x2 Z; [" t- V
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    4 d3 e, U7 Y/ T- J9 \' G9 }, s7 s
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    " T3 J+ E, |/ O! `
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    " z* u* R/ a8 t" E' i
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';( s* G* P8 h) e+ ?! Q
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    8 R/ d2 p' M# |% D- }! d! w7 T

  17. 5 k5 V' d$ |/ V8 Q" d
  18.   DEVICE_STATE_ACTIVE                   = $00000001;: E6 R) O* D. {' o
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    8 c. Y# a. e6 Z5 ~
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    , i0 H* G7 k# B
  21.   DEVICE_STATEMASK_ALL                  = $00000007;" [$ V3 X! A% F1 {! B* W7 ^1 c

  22. ; {; _2 ^3 X8 Z( @* W& P- W
  23. type' N* ~( A+ q% g( `( L
  24.   EDataFlow = TOleEnum;  l5 j) s2 F. R! p7 J7 F0 U1 y
  25. const! s0 N- Q; s5 t( l0 v! ]3 y& t; R
  26.   eRender                               = $00000000;1 x: u( X6 H' e% I, U" `; m
  27.   eCapture                              = $00000001;
    # A% F! N! A  c0 B) c$ J1 V: M1 p
  28.   eAll                                  = $00000002;2 ]1 z" c0 y* I5 e4 D% Z! H0 t
  29.   EDataFlow_enum_count                  = $00000003;* a/ t. j+ g: u- `9 Y; g" V0 A
  30. ; t% @1 m2 ?  K' h) a1 D0 _; u
  31. type% C4 Z* n* Y2 L' s2 f7 Z0 M! w
  32.   ERole = TOleEnum;
    . l2 ~: g- g: C( q. h
  33. const
    2 d$ Q6 j8 y- W2 P0 k4 a# }
  34.   eConsole                              = $00000000;
    / F- U& F, j! h/ r
  35.   eMultimedia                           = $00000001;
    2 P* N8 d, T' p7 N
  36.   eCommunications                       = $00000002;: O+ T+ ^) l' R: C7 Y% p
  37.   ERole_enum_count                      = $00000003;
    3 ]! j. Q. z: O7 m# q2 _. i* s" ?

  38. . \/ o- h2 J. |
  39. type* R% {9 m. l0 H7 I8 e; x( ]/ ]7 @
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)4 ?- k1 m* }1 @6 n
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']. W; [  r" B& r" [  o  ~! B
  42.   end;
    2 c) A: U+ x9 s* }6 N2 c0 y) |

  43. . Z0 {+ U- k; I. z& i
  44.   IMMAudioEndpointVolume = interface(IUnknown)2 X# Y( q7 ]! _: b3 i3 L1 N7 G6 d
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']! i1 G9 p" h" R' ]: W
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;3 T6 [, V2 T$ _( S- p. s
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ; a4 q, _. m- n
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;# a2 \0 s. [! T" O$ K1 c3 E
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    8 h# K( N9 l  E& i" _
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;. [3 |4 s0 `  ?# Z
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;" ~8 o& k% z) x0 o: G$ Z
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;; G% h  M+ D/ T9 u
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;6 _! C/ F, q# E/ z7 r% S, H) e
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;6 j( x3 [  b9 V% R* g
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    ( _: f& t! h* }
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    ' \# u: I, z8 R* C2 F$ T1 ~- H
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    ' C4 w- P" ]. ~! T. A
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;" G: T8 m4 }! H# q
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    " i. }! {& V" h5 D" z) m/ z
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;/ Y( f( r0 n" v. T( x
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;8 ]; i- \  g2 C. X4 O# k  u
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;& s& D, D, F3 x6 `- Q
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;- }- s, I2 }( X1 l/ o  u/ r: c4 [+ Z
  64.   end;
    + S0 |1 X- S* a3 Z
  65. : U* }4 j! T( S% M& G
  66. {  IAudioMeterInformation = interface(IUnknown)
    7 S/ t: F. D7 X2 h
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']" @4 z' ?: B0 N9 n" s
  68.   end;}
    & o+ o1 M9 v" E& Y" j
  69. - N. ~% a2 t: a3 @$ X: b3 L* D
  70.   IPropertyStore = interface(IUnknown)
    6 e( E3 d' T* h# }8 s7 r, ]0 d
  71.   end;
    , V# z9 O' y. v# `& `" D9 Z
  72. ; p* j. m% s# Q  t9 Z
  73. type% G6 o4 Y) T/ R/ N: \
  74.   IMMDevice = interface(IUnknown): X: T9 E4 o3 k) b. s  c
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']' e2 t0 Y, j% G. y
  76.     Function Activate(  refId :TGUID;7 u/ A0 Z3 t; O  v/ b: q
  77.                         dwClsCtx: DWORD;
    9 @8 w) P; h0 \9 _" F
  78.                         pActivationParams: PInteger ;  q/ a) d% t& Y8 ]! W7 g" f
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;& f4 p) U2 S# ]
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;* i8 U: W7 u$ g8 e
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;( c; Y* V+ S& |
  82.     Function GetState(out State :Integer): Hresult; stdcall;6 S4 ~1 b; J. Y( t
  83. * X% v, \5 Z/ O$ S1 z
  84.   end;- e- l: [3 v; z# E

  85. 0 l  D$ o5 [# f  G* Q) _8 \/ p

  86. 1 r" s: n' s5 a/ g4 V% }# [# A
  87.   IMMDeviceCollection = interface(IUnknown)4 Y3 _6 B; }# D: a' ^% K
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    5 r, X+ ^: j8 c1 s. F) |6 s
  89.   end;
    4 O9 v) o! `1 R! B. E4 H( w$ r

  90. 4 F& b% @2 Y7 ?9 y
  91.   IMMNotificationClient = interface (IUnknown)$ N' Y8 P4 a/ z3 W# i  H" K
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']/ H4 Q; b' D, M) r* j
  93.   end;( }6 n1 M, b' J5 U0 Z

  94. - i* _5 m" F+ y3 G1 |! {
  95.   IMMDeviceEnumerator = interface(IUnknown)) Y0 J, F$ |( z2 s6 Y
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    , w$ e' F0 Z% e6 h/ y
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;) [- j. s* g# Y2 w2 p2 U( |" t
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;5 W% T) p6 b2 d- G  `' v  S
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;$ L# ?# p1 q! L; c; D
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;7 ^  E# [4 C3 H& {4 }, E6 \: @
  101.   end;5 Y9 q' r: g  Z' `: \

  102. # y: s9 n9 ?6 r( Q3 k
  103.   implementation
    ! Z1 a& s# }: d8 u* e8 }) p
  104. end.& }2 I4 m. ]! T" L' E
  105. . v8 q1 |" y! r# F
  106. Thanks & Reagrds,8 i* V+ ]+ b' f$ ?; c
  107. Mukta ...
    ' h4 n/ V; v  ]% q  g0 q
复制代码
  1. # }, t3 t* q4 i, V3 Z
  2. it's work in Delphi 7) X# R: h  ^' N; u, A* u' p0 L# [
  3. //////////////////////////
    . e- x) W" a) }

  4. / Z2 i2 T8 ?8 g  i9 a2 W1 m
  5. unit MMDevApi;
    % `8 q% b; s7 T+ w  O5 Z
  6. $ I6 O" S" u5 p8 w
  7. interface
    9 C* |' P2 R: `' y  }* x* Y
  8. % p0 u: a- @; K8 _- {  ?
  9. uses
    6 T, O0 c& A  M& j
  10.   Windows, ActiveX, ComObj;
    * \) G* K6 {& b" U

  11. / m$ K  A- {. e0 T" W; b! r" B% a, P
  12. const
    , X3 \, K5 ?( D6 A7 s. t- T
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    ; k1 q2 Z* j, p# u. q; F+ N) M" \
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    7 j* s& m) n3 [  \  R( m
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    ! F) H+ k( Z4 @! F2 J+ S$ k# I
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    9 ?  J% Q7 q( x. m; v: W# M3 I
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';4 @& d4 j+ O3 B4 ~: T
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    5 N9 D+ s, ]0 \: f# t: z
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';7 H0 z7 `, l* y1 V; a5 G3 B
  20. ' |7 y7 S5 f+ A$ n
  21.   DEVICE_STATE_ACTIVE                   = $00000001;( f2 t0 P0 C' c- ?4 E+ Q
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;0 V- N! ~+ m% J. \
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ( S% v* q  L) O( ~/ A6 t
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    7 z2 m4 V" J# E1 j* |1 j5 u
  25. 0 W7 S; p6 Y8 _. W
  26. type' }% o' L; Y' [, j6 ~8 G  d
  27.   EDataFlow = TOleEnum;
    ' v/ X5 q5 e3 A' `5 ?
  28. $ p; |; b4 g1 `8 b0 l7 ?
  29. const( g. C4 X1 z3 b7 X; ?& k
  30.   eRender                               = $00000000;
    . X* B/ G9 N( p6 l' }, |! \9 R
  31.   eCapture                              = $00000001;
    % o1 M' X& a$ _7 V% n
  32.   eAll                                  = $00000002;) \) I: x7 q6 z  E
  33.   EDataFlow_enum_count                  = $00000003;
    1 M+ ~; j4 m8 {7 b

  34. . j4 n: y+ X. n1 j9 }
  35. type
    ! [' B1 i6 W% ^+ G$ S& }2 h6 p
  36.   ERole = TOleEnum;" H% V+ y- @0 X  m4 R2 ?
  37. 8 q+ ]2 J1 L6 y6 j' t3 S
  38. const
    : B+ l3 w! m; f& B$ ^
  39.   eConsole                              = $00000000;: a5 D+ O' C; h9 R, B
  40.   eMultimedia                           = $00000001;% z) Z# Z% [' x+ B2 x3 Y* ?% E1 N
  41.   eCommunications                       = $00000002;5 f1 P  @" X. z' l8 ~/ y+ a0 n! _
  42.   ERole_enum_count                      = $00000003;4 w0 E( k7 e$ c+ A0 I6 x

  43. ( M+ A1 O9 p8 P( g' t
  44. type
    6 X/ p7 v# ^/ o7 }3 |: f
  45.   IAudioEndpointVolumeCallback = interface(IUnknown): M# G* i+ U4 @9 J  V- X: X
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']4 |0 T3 q* M$ W$ x" v. y
  47.   end;
    $ k. v' Z$ d0 `

  48. 9 B! L8 O' T5 e9 M* [
  49.   IAudioEndpointVolume = interface(IUnknown). u/ L! n; K3 R3 _9 M
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']9 P% a0 g' |1 f9 Q1 G1 ?' E* m; ?
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;$ i4 q* K$ b# M4 Z0 t; O
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;4 A" A* h& e  A% f3 D; v3 [
  53.     function GetChannelCount(out PInteger): Integer; stdcall;4 c2 J, R& O% u; }  d% P
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;$ a9 e0 X: Y. e( i0 ?8 b+ y8 a
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;4 Y+ A5 G, H  y6 a  R$ g
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    3 A7 g  z6 u6 \& j
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    " Q: x: e% ^$ n4 R9 H; M9 k6 r
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;2 G3 ]) q) Y! q( y# [
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    , b! c6 _/ z6 L! d
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    * ?  h8 q" |# k. r
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;' Z0 W& y+ q/ S( y6 F; c+ O6 b
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;. u, [0 A3 U! k( _
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;3 x2 }; G6 }& L& y5 E( C* }  W
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;" f& t4 }- s, ?
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;+ Z4 e) s7 o, x
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    1 H8 X" ~, G: C2 ?
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    ; T& X8 R5 A6 ]! J! i  ~
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    ( y$ Y( h. T! _
  69.   end;
    # X! k- B+ O' q9 [: L# j0 H7 `- k
  70. & u1 W1 F. {- x
  71.   IAudioMeterInformation = interface(IUnknown)2 Y( M/ u7 {6 c
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    ) Y' V/ s7 U1 c, v) G- G
  73.   end;! Q: J% ^8 |! M/ K: C
  74. 4 K: h5 G+ |+ {( \% p
  75.   IPropertyStore = interface(IUnknown)
    8 d! w' ?6 w* t7 {1 q  D' B0 ?/ @
  76.   end;; {' i+ s( N- V8 ]: v

  77. - L8 k: z7 N6 A, M, J) X. q
  78.   IMMDevice = interface(IUnknown): C( t9 q4 }, c0 u  W) y
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    * B/ Z5 W4 T/ y* M. K
  80.     function Activate(const refId: TGUID;! D! p7 {- D0 U9 ]3 S! f
  81.                       dwClsCtx: DWORD;
    4 Z, o5 k) V. M* Z# j: {
  82.                       pActivationParams: PInteger;
    2 [" L+ @$ |- P
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    & ]: L; h" h# ~
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;" l$ I. g/ y3 {3 A1 F5 m
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;, h0 K% T* i7 I+ |! y. j+ A
  86.     function GetState(out State: Integer): Hresult; stdcall;% e/ ]+ _. u$ C5 x( ?: S
  87.   end;
    4 A; ^4 @* M% T. ^! j% h6 d
  88. 5 a$ q" N: e( i0 v& Z# ~: j

  89. ( A; V, ]9 T9 r% u1 `) N: j: b
  90.   IMMDeviceCollection = interface(IUnknown); Y4 n; ^' k& @- @: H+ X' b9 W
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']! \" D" a* C, d3 z: |
  92.   end;
    ' R+ v7 `) t, M) I# C- W! n6 q
  93. 5 {) w6 q, b, d; U
  94.   IMMNotificationClient = interface(IUnknown)6 f$ r2 |6 }5 v2 ^
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    & q, U& b1 k- X! |+ t
  96.   end;
    & y, `8 Q/ r% s1 |; \* h" y' J

  97. 7 j- n5 W1 M6 H3 D: @. D
  98.   IMMDeviceEnumerator = interface(IUnknown)2 e/ @5 t6 G. {0 a
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    2 @9 ^1 j- O- r0 X
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;0 u' h4 [3 u7 x/ d
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;1 B. a0 @/ F9 x- @7 I
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;' p2 q- }1 e1 t, ], e, z
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    3 ~2 t5 _. H5 D
  104.   end;
    4 n0 J7 R; O1 ?/ {! \

  105. , d8 Z9 ?0 a1 s( I. @: R4 _
  106. implementation
    % f" m7 q. o0 q" F

  107. $ G+ f; Y+ @8 s& X% p! o
  108. end.
    . I  _; Q( o  {& @0 k; u
  109. 6 o7 k( N( X- _# x: R1 K& w9 A
  110. ///////////////////////
      C- e3 ^9 B0 q; |
  111. simple sample :)) Y# \2 G# B$ D( Y4 y# v
  112. ///////////////////////7 ^6 Q' ^% P' \: o  J( F5 O0 l* F
  113. 0 c( \  B8 J2 ~
  114. //...... other code
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  115. $ A' B% q! @  y  X
  116. uses ... ActiveX, MMDevApi, ...;
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  117. , Q4 p' U/ E3 t
  118. //...... other code% v3 n  f) e8 ~: q
  119. 9 g6 b$ X2 |/ E
  120. var
    * {; C0 s9 N; H- o  X/ R
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122.   v5 T: J+ d6 J  y
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var6 \$ G8 A' ?8 d0 b) F2 R% z
  125.   deviceEnumerator: IMMDeviceEnumerator;, f0 \( Q6 G' d
  126.   defaultDevice: IMMDevice;
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  127. begin0 ?8 s6 ]: x7 V& o- F" F
  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);' v+ A! i3 B% R0 o% L2 [- t
  131. end;
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  132. ' O3 {( Q- e. U6 `( E6 `
  133. procedure TForm1.Button1Click(Sender: TObject);" G$ ^- d- j. I% [2 t" J+ a/ z# S
  134. var
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  135.   VolumeLevel: Single;) N7 n/ L# f; `" u; m
  136. begin) ~4 j' C2 u9 w& e: w
  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;
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  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);1 ?5 i4 G; N1 B. z0 e5 ^) [
  140.   Caption := Format('%1.8f', [VolumeLevel])) T3 K" b6 f" y
  141. end;/ u0 O0 g2 O/ S3 z' u; a
  142. * D! q# G( Z" ~6 l! A, }) R
  143. /////////////////////////////////////8 j& y& B) S# i1 S. m
  144. # u1 A( u* j0 F) I
  145. // with best regards ToxicDream( l# H) _) x  p* a- V% N. Q% a( k
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