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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 Z. w* d1 M0 Y9 @+ f8 j0 D2 ?
By Mukta & ToxicDream
  1. ; {1 e: }# [8 C" k  ~
  2. //for delphi 57 z7 b0 W  @2 j% ?, c; b5 `
  3. unit MMDevApi_tlb;
    ! D# v; K! {& |) C1 [) R
  4. ; S% q0 s7 T; P0 D( b* J/ `: R1 E+ d
  5. interface
    ' y8 ~" y) C8 C' @7 u8 Y
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    ( x+ i0 Q) V# ~5 K. ^
  7. const
    3 b2 r  I% Y9 e, h7 |1 S2 q
  8.   // TypeLibrary Major and minor versions' T' D' A0 L* J0 b/ L
  9. 5 Y: d+ x( l9 }* c6 B8 T& h9 O2 y
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';! |9 Q- P) H3 M9 y$ z- Q4 U
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';3 o/ M% m- o+ Q' w  y$ L. L* W
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';8 v( s3 Y: K9 [: M' a+ A
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    8 q( p6 H6 o) H* k. D4 F& m
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';% E+ T2 Q. T% C
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';8 t+ A2 g- P/ ~% A
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';: ?+ }7 _6 I% d: t2 E
  17. 5 x6 N: {( S% v0 A( Z8 c  A. N  e
  18.   DEVICE_STATE_ACTIVE                   = $00000001;( k  }- N, L$ U9 Y
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;1 H8 c" |7 y. z7 k8 o/ a! S- [
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ; ?4 O7 B) i4 f2 p" s  C! I- @6 {! O5 H
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    0 M8 F. Y6 m* f: o6 |5 }

  22. % E1 w& X4 e* A
  23. type5 ]' R# H' a: ^* C; ]
  24.   EDataFlow = TOleEnum;
    ' |2 O2 I0 u) b# W3 ^8 `* d: D
  25. const; ^% z! ^4 R; H* L/ |! t8 ?5 z& [$ \  x
  26.   eRender                               = $00000000;
    9 V0 X' h6 F- t4 T. w2 q$ W
  27.   eCapture                              = $00000001;) F# Y- _& l* l6 V: l' U2 k9 u
  28.   eAll                                  = $00000002;3 V4 x+ X* l+ \# Q
  29.   EDataFlow_enum_count                  = $00000003;5 h6 q' L1 l; p3 t* M8 h

  30. 0 K  M* c/ K. P+ \( X
  31. type
    - v1 }" G1 [# X! C; U
  32.   ERole = TOleEnum;  O- Y. @5 g) G; W$ D& c2 X
  33. const  ?8 x1 ^! D( F9 ^
  34.   eConsole                              = $00000000;
    3 E0 B6 P2 b: A9 i+ _
  35.   eMultimedia                           = $00000001;
    $ b( Y2 s# z! J. V+ L/ n+ i
  36.   eCommunications                       = $00000002;/ D0 F. O* x7 `% Y  i& E
  37.   ERole_enum_count                      = $00000003;
    - r: n) b: D% P8 V  L
  38. + h. i; D( U* Y: V5 f$ u
  39. type
    ( U- z: }) T& ]8 B/ u: O
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)) x6 |4 `% X9 D- S! \, d, c
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    " U( L$ n( u. Q' m# f7 f# J
  42.   end;
      j* {# I$ L" c7 z1 ^1 d5 N, B
  43. 9 P7 @" Q& o2 T! J
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    . @7 J* a! R; D  k( _/ i" o
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    2 H2 \) r, S  u- |2 f, _
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;: M& C' ^  B8 H# S3 n' l
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;/ l  O( O6 y- F+ f8 W
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    * R" h1 S$ T! k) [! I: E' S
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;; Z/ ^$ U: H2 ~* g" m5 O  s! T
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;# w8 Y+ Z: r$ E% T6 s! }% N* z9 M, ?
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;! Q, Y$ q4 q& _5 Q
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;! b2 `# @5 e: _4 A
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;# j" {9 m% l  B8 s& l$ R! l
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
      c3 R: b/ o0 o& f4 L( [; ^
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    ) y7 s1 O: t5 `
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;$ i+ z3 Z3 s7 a) c4 [5 w# o, B
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;5 X$ H: b- [" l. A8 Z* u9 @
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;, E6 B2 \% Z1 J$ y6 {8 x
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    0 ?* g7 b7 {) u
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;( T1 Y1 h: b6 G) g& [
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
      p" d" B/ ~) ?- z) r  B0 K2 J
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;* |7 _$ m! Z  E/ u+ `2 k0 y
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    1 m- ?& |: T/ `9 x; Q6 Y
  64.   end;; I+ _$ U; ~% j! D' c0 v

  65. 5 e6 Q: N) T8 |/ o
  66. {  IAudioMeterInformation = interface(IUnknown)# w7 k. W, v& S* x' _
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']" F  S+ O( Q! I8 f6 D6 H
  68.   end;}9 J! u1 H5 r3 j  j& N
  69. 3 ~. P8 c& e4 ^- v+ S( L7 H) h  _
  70.   IPropertyStore = interface(IUnknown)
    # m- N, z/ n0 S6 R
  71.   end;& E5 e$ S! `  n' }8 q5 D

  72. 2 T7 j0 q1 U+ ~* w$ t
  73. type
    8 w0 Y3 e+ y6 n. B! j) a6 q3 B/ L
  74.   IMMDevice = interface(IUnknown)
    4 C9 [! O; y3 W7 y. m+ s
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    6 N( Y9 }/ ~5 c! |1 s1 u
  76.     Function Activate(  refId :TGUID;
    ; ~8 j) u4 K7 [. v
  77.                         dwClsCtx: DWORD;9 |4 G& L) k" ?: J+ I
  78.                         pActivationParams: PInteger ;
    0 c1 L3 M7 [7 G2 `
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    ! s7 c/ O, |5 N. c7 I
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;( p# r  z/ [; W- q! v
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;2 ^0 k, {8 F5 G9 u/ h  d3 O9 i2 ]3 F
  82.     Function GetState(out State :Integer): Hresult; stdcall;0 K: T% x) x  N6 O1 t- I8 v

  83. 3 ~) u, y& g$ Z  }6 e  I8 @6 r
  84.   end;. P) }. t: c, J. ]

  85. # R+ B) A! n: Y; Z( X

  86. . N5 C) d/ y2 n1 T. Y. N
  87.   IMMDeviceCollection = interface(IUnknown)
    1 _& @5 f. l1 S( g! B) y
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ' E4 s4 c) a  k, o: f6 j: ~3 k
  89.   end;3 D7 w5 v9 B7 ?1 ~! O, @
  90. * M- d3 }1 l9 G( z+ m% U+ j; l) M
  91.   IMMNotificationClient = interface (IUnknown)' ~5 B9 h, ]7 {. _# y
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    - E+ o$ z% g' I1 E- B
  93.   end;! s* Z+ S) x; z2 w
  94. 9 O2 z  c# Y" l3 A% Y% g- @
  95.   IMMDeviceEnumerator = interface(IUnknown)
    - h  Z; T* e7 V3 G
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']0 t4 K- Y; D5 L0 Q: T/ n
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;4 C5 x& S# f1 y+ j3 O
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;' @* g# e! K  A( E! A, h
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;: l/ [7 P& t( j
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;; H0 b8 S* j7 b5 v
  101.   end;( Y4 D1 i) d4 U5 w( `* P" O
  102. * G/ R1 _6 W! E7 }" o
  103.   implementation7 d% {; T9 r+ m' S9 v) ^
  104. end.
    ' T0 t+ @/ n) u4 j; ]" S) V+ a
  105. # I# }; J- C* Q: `# I9 ^
  106. Thanks & Reagrds,
    3 |: M9 ^' `9 v3 O# [6 F: ~; @  n
  107. Mukta ...
    " z; }( ]1 n+ J' [) d0 |
复制代码
  1. / D+ p! f; @" u. d4 ^4 l; I, x2 |
  2. it's work in Delphi 7
    2 E9 M1 i4 I3 X) r2 g2 R
  3. //////////////////////////. k' @7 Y  {/ ]8 H% W

  4. ) w8 F+ F6 l/ v9 L( l: s
  5. unit MMDevApi;" w$ z  m. W' C( S

  6. - H% H( `# Q0 T6 C2 |
  7. interface* ?) ^+ C# B. l6 I- I" p1 h  b6 L

  8. " ]5 d( N: J$ B. K; G
  9. uses! c: u) e$ C+ G" `: Q# B
  10.   Windows, ActiveX, ComObj;
    : @7 o8 r- L3 |# ]1 P. ~: N
  11. % Q, S* c* C& g" z& U: ^
  12. const8 V8 q2 [& \( p$ [
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    : j' f6 o, J  z3 \  `$ R
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';/ g0 Q3 H1 s4 ~" g
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    2 Q- F3 l( L( C- F  c# q
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    7 Q. a7 r9 J+ C+ m! n
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    2 p2 f) `8 V/ n. G/ A
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';' v& t  {9 R6 P& S" M
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';3 D3 B9 B; S0 M; r  D# C% y

  20. ! p0 O( C$ O/ E0 h
  21.   DEVICE_STATE_ACTIVE                   = $00000001;) K5 p  h/ E5 B' m& Y
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;1 A: c3 ]6 H% J
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    : _# m) s# E  u1 `1 L
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    - D. C3 Z5 M7 I9 T( i
  25. 3 f" \: [/ g. T: K& K2 Q6 x9 M8 ^9 @- n
  26. type
    & H, `+ z3 @9 \! B5 m) F
  27.   EDataFlow = TOleEnum;% R. g+ _8 a/ T

  28. 7 c$ _! u9 i$ [' w$ p# Z: u& c' f
  29. const, O) k8 t- t$ R% ^
  30.   eRender                               = $00000000;
    . Y! k2 J5 n8 I# |8 P$ F  U
  31.   eCapture                              = $00000001;4 s& I! b( L! s5 E
  32.   eAll                                  = $00000002;
    6 }1 t1 M$ C( V3 z) r: i- X
  33.   EDataFlow_enum_count                  = $00000003;8 k; m4 w8 H6 j( u
  34. 4 }4 H0 P. k" X' U: r0 V
  35. type
    ! }- K* S  V  u! e
  36.   ERole = TOleEnum;
    & @, {  o7 \) I" {1 R' m/ e/ J
  37. ; [  K$ F* E5 e' P4 ?: Q; n
  38. const' E. D: p. \* M! W
  39.   eConsole                              = $00000000;
    2 l/ q+ c6 ~" ^* \5 k) Q
  40.   eMultimedia                           = $00000001;
    : R) o, F" v1 L* _
  41.   eCommunications                       = $00000002;' E5 R; |8 P4 V# r- t9 h- X1 D% ]
  42.   ERole_enum_count                      = $00000003;) `5 Y3 l, U% m( b

  43. ; m8 `9 E! h& }* R
  44. type+ b' P( a3 k4 c/ D8 N' A
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)0 Y& H9 x4 m3 B+ b8 M% J0 {3 I
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']) X' B, ~$ D+ |
  47.   end;# R# d- a3 Z3 w  {1 a" l

  48. 7 r  V+ X* y& R+ D8 d: Q
  49.   IAudioEndpointVolume = interface(IUnknown)) c6 p/ q$ N/ P# }+ |# T8 _' V5 ^
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']! z' Q: K* N5 N  c: F
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;" D) Q  P, U/ y% Z9 ?6 k+ H
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    & p: q5 t$ U1 S4 d7 ?0 p: F7 w
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    6 d! I) u6 s- Q% F9 g  L* J) Y8 J
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    - s) Y4 K4 ]( C! h! r8 v
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;" c2 i. s& z# }
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;: D+ U6 Q/ q: L* b2 ^
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;$ s% `( C6 t6 m7 j# B
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ' K* w/ n) y! q& R
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    3 Q, h9 w- `' f2 B* i1 D, \
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    9 y! g5 H- r9 m# C& y. {+ d! S5 |$ c1 Z
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;; ]$ Y: \) q; x' q3 g  a
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    8 w" x# R6 ~. G3 M
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    : [! K$ O0 ~4 ~: P# _$ ]
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;* F3 {) ^8 w' i3 U# i' M( u
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    0 A3 O, E& n6 U# z1 j0 b
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;. e: `- e6 t1 P& a* u
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
      J* |9 B! P. v7 H( X4 z* O
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;6 v. V- M5 @! ^4 d
  69.   end;; y" S$ N+ V  m) e7 Q( D4 c' d
  70. * @8 l" m5 f# c0 M
  71.   IAudioMeterInformation = interface(IUnknown)
    & I6 y5 V" Z$ l/ H0 i
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    0 S3 {$ r, s* p9 T
  73.   end;
    0 x! N7 @* T4 W& H& K% T; F
  74. 3 P) u3 y/ A; f4 F* `( ~; @' Z
  75.   IPropertyStore = interface(IUnknown)
    " l0 U0 J( M, t: m3 _6 d/ Y
  76.   end;
    ! e( g* V* ^6 r. c  F
  77. & v  }2 U4 @% E4 q
  78.   IMMDevice = interface(IUnknown). `, R  ]0 {( q4 f
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    - C- B3 D  e. f, |
  80.     function Activate(const refId: TGUID;
    ' V  j3 M4 f6 L' B( X. L) I0 o
  81.                       dwClsCtx: DWORD;
    ' S, K" R( |( [7 `
  82.                       pActivationParams: PInteger;, E# t( i( z2 H& e
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;6 H$ A. m1 q% {+ y2 }1 R4 s
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;% n, j+ N5 P  z: o: T8 R
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    $ F$ r' M2 I1 n4 ~" j
  86.     function GetState(out State: Integer): Hresult; stdcall;* e7 b, P' b( C7 ?4 h* _, G
  87.   end;+ }( m4 ^5 v: }% ^0 V
  88. 1 O* e% Y) f* t. d2 i

  89. ; m" l, k7 H" c
  90.   IMMDeviceCollection = interface(IUnknown)2 z% h1 k- s! y% a
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']7 G, d1 J5 N0 \% I& C+ T
  92.   end;; I, T! }1 q) c- {1 v, ~* F3 K
  93. . L9 o# X- s- K4 d( r3 |, Y" K& R1 |
  94.   IMMNotificationClient = interface(IUnknown)
    ; ?: A5 r. q) D( I8 W) t
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    8 H" \+ l' \2 m4 D, f# v
  96.   end;
    3 D  H3 Y1 A6 D; K  N' F

  97. * n$ T& P/ j4 V! U6 {4 [
  98.   IMMDeviceEnumerator = interface(IUnknown)0 I9 ^- I* d1 |
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    ( v9 d$ {6 a+ B3 [6 _3 l5 `
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    " l! [: z6 m9 {/ L
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;, f, F5 W! ^' F2 U. R- W* D
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;- r! K, D1 v4 j$ c
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    ! r. o) Z& _& e7 u0 s  F
  104.   end;
    2 z6 S  `9 b, C3 {; Y2 v+ e3 i

  105. ) g1 v4 F7 x+ b/ W  W6 V* q1 y
  106. implementation
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  107. " O: V* C+ @9 O( n$ v! v' Z
  108. end.
    ! ^, j* h# {  m/ Y1 D0 }
  109. ; ^* K8 v' T# e' P" n
  110. ///////////////////////
    % l9 W) w. Z- f% R
  111. simple sample :)' S- X$ h- Y( s' x4 n
  112. ///////////////////////
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  113. 9 d. b; E0 Q9 k+ b
  114. //...... other code" a( e# E" ~$ h& f* g  d

  115. 7 B) b  a6 C9 i9 ~5 C7 g
  116. uses ... ActiveX, MMDevApi, ...;( Z. F* v8 t8 I2 ~& k
  117. - `5 f" Q0 ?7 u9 J$ o) q2 F4 l
  118. //...... other code" j) C9 l% g3 |

  119. # D' k3 k, s" T. L
  120. var' M; q' ~3 |$ F, {* r6 \) t
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. , r3 |/ R  e/ X. e  v$ i0 H
  123. procedure TForm1.FormCreate(Sender: TObject);- e' }+ @  R5 T* [/ O& d
  124. var
    6 I- I2 ?. k+ j! [
  125.   deviceEnumerator: IMMDeviceEnumerator;* x' g+ J5 y. K$ Z4 [. J
  126.   defaultDevice: IMMDevice;  f9 c% u4 Q% x4 r
  127. begin% _, L# W8 `1 Y$ k; F0 H
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
    ; {( V; A6 ^3 S5 B8 V: L% |
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
    - G. H& k4 {( t
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);0 U& i! x  R( r* I
  131. end;
    5 u! L  }  G+ `- x/ }

  132. ; n) O2 T* \: ~+ O! o, z* Y
  133. procedure TForm1.Button1Click(Sender: TObject);# I# y4 y, N5 D; R& a. }2 v
  134. var
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  135.   VolumeLevel: Single;
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  136. begin, j4 b, s" t4 i+ z# R3 v
  137.   if endpointVolume = nil then Exit;2 B2 m: r, \4 S5 e' _9 ~" s
  138.   VolumeLevel := 0.50;3 I+ _& Z! }1 M- ~
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
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  142. 4 n8 L' {  r8 E- T- p, \
  143. /////////////////////////////////////
    ' p1 V% k* [; }9 q$ ~
  144. : }3 [- X: h6 Y1 h" Y( |# {+ u
  145. // with best regards ToxicDream
    ' L$ p0 V+ L2 g  t
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