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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
1 s: {1 y" M& u/ _; p( c( zBy Mukta & ToxicDream

  1. 6 B2 ^& x6 g7 \
  2. //for delphi 51 [6 h2 _0 Y+ }' b5 T2 x
  3. unit MMDevApi_tlb;
    ; e" Y! X) S+ ~% r/ o" n0 |
  4. & r& @8 V3 k% w6 h, d! ]
  5. interface
    3 i4 s' t8 I' {
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    & k% G' _8 U0 ?8 E$ Q9 R2 i7 T: h
  7. const
    : U' l" f0 t& N! w9 N; @" ?
  8.   // TypeLibrary Major and minor versions
    ( O5 _. e& i0 T' o2 I

  9. 5 m1 O; x6 f6 n8 h
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';3 v9 f  w6 \, y/ e& I+ n4 x
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    4 J7 g5 n  v) B# P7 I& ]/ u9 R  @
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';& g! a4 y( Y2 G. o( P* S
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';  o/ `) g  |3 O# ^9 p; S
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';$ e' O+ ?& i4 }
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';. \& Y: W2 h& G
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';% @9 b, E, u* y* C9 K- k
  17. 2 k+ f4 r9 I2 w' s) j
  18.   DEVICE_STATE_ACTIVE                   = $00000001;% R" U8 s2 F" G; y, n
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;9 p& g  R3 k/ p& W0 I5 p
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;2 [5 _( B1 C3 Q5 {
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    . f0 r& Z$ v* C) {% ?& S
  22. : a% j4 q1 |8 [" q  }; u
  23. type
    4 z3 v1 {9 b( L
  24.   EDataFlow = TOleEnum;
    7 x: q' N" \* _' D, C6 I+ h
  25. const3 z# P8 K* h5 N7 d: O4 ~! F
  26.   eRender                               = $00000000;
    ) b& K1 }. q- i  M. X" W# W! [
  27.   eCapture                              = $00000001;/ T7 e) ^# x$ b' h
  28.   eAll                                  = $00000002;
    / z% ^" @$ k4 o
  29.   EDataFlow_enum_count                  = $00000003;
    7 T/ ~& `& z$ e1 s  W1 f

  30. ; `  B* F' @4 w* ^
  31. type8 j/ K! G0 }- @, T: i' m: z( g1 m0 A
  32.   ERole = TOleEnum;( M9 U$ P  @7 O( f
  33. const% e6 f2 F& ^9 d/ v, [1 B- W
  34.   eConsole                              = $00000000;2 p% s' \% y  e  K, e1 R
  35.   eMultimedia                           = $00000001;8 E7 L6 q- n$ ~* n/ g
  36.   eCommunications                       = $00000002;
    ; T, X* P2 a; T' u
  37.   ERole_enum_count                      = $00000003;  \. E+ L/ [- c, \4 ^* N, n
  38. 4 n6 c% G; ?/ M5 Z4 ?  Q
  39. type6 A& a9 s: ^/ [  o, B
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)8 d% S2 o+ N' y% v$ L" x( g
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']; E: l% k& X8 \9 N* H
  42.   end;
    6 U( n8 M5 ]) }- \  t

  43. 0 X$ ^. y$ B. W# X5 G7 U
  44.   IMMAudioEndpointVolume = interface(IUnknown)+ V6 A6 P+ H# c
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    8 p) v: [8 \( _
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;) }# [% M3 f" d
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;, m1 ?, ]8 e2 }( I8 k
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;+ f) Z7 `  b( b5 t' B# ^) h
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;9 Y7 U5 T) _' {" b/ h9 I6 G% u% N7 }6 ~
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;9 K6 V) s! G! }+ z2 D
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    , G; s* m$ H' R6 g8 f5 B) G
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    ' j' G, B0 @# E! Z9 j
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;, S3 S3 Q; v, `
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;  c" U$ x: R- D- y  q
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;& |; q- r* K* R' Z& ^
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;0 E6 p' I9 \7 d
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;8 }  {8 @; e# F! t
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;7 i, Z" N! X6 n% x/ {6 J3 ?1 c
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    . R! o+ I$ L, I9 S
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    3 G$ {5 L4 ]4 D9 ]: ?- u
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    : W0 ~3 ?: f* ^( R- B
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;" a" Y) w- M5 l) Q7 T+ v! m
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    " w( J  ]7 u: @/ w% v+ K$ E
  64.   end;' j! X9 I3 s- y$ v8 `

  65. 1 a- ]9 a3 q$ p
  66. {  IAudioMeterInformation = interface(IUnknown)4 m. I! S: }. c' i) P% M# S
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']  _- X" Z4 [7 `: a, Q' k
  68.   end;}
    # @  R& N( G* e

  69. , V' `5 u. J& e( |# [% l$ |/ r
  70.   IPropertyStore = interface(IUnknown); s! {* i6 S: ?9 v
  71.   end;
    . I  y; D: p, Z

  72. 0 i2 |, o8 {$ i: W( _  K
  73. type  k" [5 n$ |% y: {! U$ _
  74.   IMMDevice = interface(IUnknown)
    5 ~  d6 M; F/ M3 o$ T2 m3 g) M
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']+ c2 @% A) H# x, ^" `/ F
  76.     Function Activate(  refId :TGUID;
    / B. g) k1 I- @
  77.                         dwClsCtx: DWORD;: C$ D* t4 N1 k  V
  78.                         pActivationParams: PInteger ;! Z& M% t' Z# ~* o2 G9 C6 J9 C
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    , h' ^; r" z% F9 o% K6 S" t. X7 s
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;5 O2 f9 j& H+ R
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    5 {! e, `$ `# E
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    7 r3 i# ^& d% S% A% i
  83. 6 E( d3 p5 Q4 d2 F2 @( N( Q( h8 ]
  84.   end;
    4 o& N7 c' o8 [- P) e) @

  85. ! b+ ]/ b3 h6 ^% l: z4 R; y

  86. ; I- a* ?$ `3 s* h( c  l
  87.   IMMDeviceCollection = interface(IUnknown)
    * L0 y& O5 p7 b# W9 Q+ a6 ], G
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    # b. `# E& u$ W% N' f
  89.   end;
    3 p# s' w3 v& ^/ M: P
  90. # J7 S7 A2 h+ A8 w  p4 }
  91.   IMMNotificationClient = interface (IUnknown)+ `2 y" [+ w5 g
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    ) Q* W9 L7 `/ _* d
  93.   end;
    ' y) M  z. J# _/ f3 x/ g" ^

  94. 2 N! L4 a2 K$ V9 |' n
  95.   IMMDeviceEnumerator = interface(IUnknown). s9 R, W1 g1 x5 w* e; N
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}'], c2 {: E, t- t& R! Q
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    ) }1 {0 j- y; o& X+ z, g
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;4 w8 O8 G5 |5 O5 k
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    8 }; r8 C9 _% D; W% Y0 [
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;$ o6 t6 Q, K8 D& r
  101.   end;
    4 o, U3 T, @: u  i1 N  B4 T
  102. 7 _4 {# y/ V! B& D6 I5 e# \% z
  103.   implementation" t. B; W; t( T3 X% Q1 T# ]- a
  104. end.
    . d& i  V* s! U9 D
  105. ( S! x) n9 A5 {+ v$ e9 d/ }
  106. Thanks & Reagrds,
    % |! ?9 m& P# U: L6 c/ x
  107. Mukta ...
    + I8 c7 s5 e2 c' ]
复制代码

  1. * u* a: |& W( J9 e0 h9 t
  2. it's work in Delphi 7
    1 L; m% |' W9 F0 V. l2 o4 w" S9 Y7 N
  3. //////////////////////////
    6 Z8 \0 ]6 Q, _) D' y+ {/ t

  4. * m! Q0 \" Q, i) Y$ r% J* T' i
  5. unit MMDevApi;
    # G+ q4 _3 U$ i- s2 E
  6. , Y* E& s5 `% m9 T) q$ H0 g' A4 [
  7. interface
    ( \& [7 w: |6 I2 ^
  8.   F, l6 S/ j1 R1 _
  9. uses
    & q9 ]9 \% T" @+ y) ~
  10.   Windows, ActiveX, ComObj;5 P: ^  q7 }7 G; ^0 _$ S$ p
  11. ) Q- H9 u  _3 L; a" R% j
  12. const
    + ?" h. C5 ^0 u4 q, A# A4 r; o! {) [: C
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';, z5 }, ?2 V# Q' A5 a% c# L
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';- w* m! C+ B" y3 y" [. w
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    ) E& v- T( B9 c5 w* W% l2 {
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    9 K* |. K5 o" F3 B
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';7 b! J8 {' m% L. C
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    0 G5 V& D9 o2 t* W$ m
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';& m/ p' G' w* Y8 Q7 X, k8 |1 p
  20. : ?/ T( T2 h% N* ^& c
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    # L. `6 w% j5 r
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;3 ~; q( h3 w  G9 x  [
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;) M7 {, L! C5 Z% v+ w# a
  24.   DEVICE_STATEMASK_ALL                  = $00000007;% ^$ I  [, i$ d9 F5 h1 k& O" b/ U# H
  25.   E7 l/ o) Q4 Z3 i
  26. type
      G" \, u( a* |- P. Y
  27.   EDataFlow = TOleEnum;
    : G7 u; R4 c3 Y3 j

  28. / Q0 W: o. K3 J) z
  29. const
    * L1 c( A/ [! a, s! `
  30.   eRender                               = $00000000;- Q2 ]# [  p4 L
  31.   eCapture                              = $00000001;
    6 V* x, S, V% G- f# U2 z
  32.   eAll                                  = $00000002;. u8 C  d3 E9 R  n; G0 l  d
  33.   EDataFlow_enum_count                  = $00000003;7 u% o- P" P- E- D5 E2 s
  34. ( ^. _; y, I/ M) t1 x1 Q
  35. type" u! {& i0 n. N" K9 v# ^% d
  36.   ERole = TOleEnum;" e$ E0 y# a: j7 @5 u1 D% a% z% f5 ]
  37. . b: F- H" x/ o( V
  38. const
    4 W. e$ [8 f) F2 p4 @
  39.   eConsole                              = $00000000;
    ! S. d/ ~  ]2 g7 P, E
  40.   eMultimedia                           = $00000001;
    4 c# p  \/ q% m5 k3 p: M' V
  41.   eCommunications                       = $00000002;* F4 e0 E0 S6 F" ]/ t4 z, e$ m6 |: l
  42.   ERole_enum_count                      = $00000003;
    / I+ _/ H8 K" J& a& a8 }# ^2 K' z) @
  43. # e' V( d5 S2 ^6 @, x
  44. type, X- l& @7 m- M+ v$ K* W
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)& r' [6 Z2 A8 G* t1 r
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']" ^! h* M6 U& A
  47.   end;
    . b9 W* b4 }$ b' r8 q+ l

  48. & p. s, A! r! m" E  m  J$ V' }
  49.   IAudioEndpointVolume = interface(IUnknown)! E7 p+ M7 Y) z; \1 v
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    6 H" F) b8 j3 ^; j3 c
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    - d: S) i+ B* U9 F6 E& N
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;, @" `* V) U  _+ L5 f- ^9 V
  53.     function GetChannelCount(out PInteger): Integer; stdcall;7 C/ b* s& k5 ~0 ^  U1 n" S, ]! R' q
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;4 A$ c( A# x' V
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    9 U- M1 h' J% ]/ U* K' f
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;- R* s* f3 _1 n) G5 O
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    * C' }4 M8 l2 u0 I+ P3 i) H' v0 w
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;+ I5 D2 n/ [) O8 t) U
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    0 W# R. u; H5 ?6 }1 c1 e7 G" o* Q; V
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;& N; c/ t: v1 }; {$ b$ _
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    + \) A' m1 a. k0 }+ }# I
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;5 w3 {0 }! K8 P& I. [
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;9 e7 n. H6 W3 M5 V
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    * G5 j+ v' J7 L+ |+ D
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;! d% ]3 v( J+ c
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;6 X9 Q4 U7 I) \( y  d1 C' O* Q# S
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    " V" H/ b( S, X
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    " w+ d0 L& q: o7 i1 U5 S' M
  69.   end;
    4 e$ e  F2 L5 o9 k/ K
  70. 4 Y  ^) M* _/ n' x/ Z& l: M
  71.   IAudioMeterInformation = interface(IUnknown)5 r0 s0 ^% b$ X' u2 @
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']* c- g: o7 I3 t% p+ j' W7 z9 C
  73.   end;) {2 n4 F! G( G9 u$ B! k
  74. 0 J- u: i5 q% M* w! ~) L
  75.   IPropertyStore = interface(IUnknown). D8 y' l1 H5 m" C: \
  76.   end;4 H9 z/ z2 q8 z8 V
  77. ; s5 Z5 Y8 V+ N4 a: s
  78.   IMMDevice = interface(IUnknown)4 l, N" ]: ~, Y* D
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    + a2 K0 f4 a5 P& k
  80.     function Activate(const refId: TGUID;
    % g: i( B; D" L& p2 L
  81.                       dwClsCtx: DWORD;# v! i! f& f0 D9 O. u
  82.                       pActivationParams: PInteger;
    + w) n. H" E1 B7 l; k3 a
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    0 e' N( D  ]5 h. k: L6 K( z% V
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;* \: V3 g2 W5 V# B4 b
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    ) I4 n# p) g, n4 |& d
  86.     function GetState(out State: Integer): Hresult; stdcall;. C6 J3 E. O, v8 d7 f
  87.   end;; i1 B2 @3 ^3 V5 N( n3 L9 o5 M
  88. ! s. I1 H5 S1 _( V% ]4 h# d( T

  89. 8 r! d- e$ Z% E  ~
  90.   IMMDeviceCollection = interface(IUnknown)$ C/ G# r9 J1 w
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']- n) U1 w- k; Y# v/ D; L
  92.   end;
    + `+ [6 L( s/ l. @5 X! x
  93. ' J4 @: J1 h" e9 \- f- ~6 @3 ]
  94.   IMMNotificationClient = interface(IUnknown)$ e5 |7 ?* D' u
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']( u  I* \* Y) |
  96.   end;
    * [3 f5 J' A  ^  v( i. h! {

  97. 6 _! ^; y+ n  H# n5 h* I
  98.   IMMDeviceEnumerator = interface(IUnknown)/ _0 M1 V" X1 Z  ~: o. z% H
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    ! V6 ^: ]* Y( Z+ ~
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    " d. {6 v: r4 Y- S2 M$ N3 j" U
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    * }2 I1 q. |- S7 O) S
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;* Q- K; T! G6 ~5 V8 O
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;' S; @2 E. `8 l, W& }" E+ u
  104.   end;
    6 X' \& R$ B+ Y6 f
  105. 4 k+ P- `3 `' T6 k& c; |: s
  106. implementation1 x2 k) V& }; D7 W
  107. $ @# E* @5 E( j1 u$ w; P( B* o
  108. end.8 f) y8 G. e% l, O7 z' O+ S

  109. 0 o- \+ |! p1 e' M9 P
  110. //////////////////////// c  J  p0 p% y6 H: u- D+ k
  111. simple sample :)
    2 F1 E* V# [! ]) f4 a! M
  112. ///////////////////////" N1 w6 _# h  T  ?1 f
  113. # L( f1 y7 G- g# V
  114. //...... other code
    1 A6 P9 R, F9 [; f/ Q; j

  115. 2 N$ j! }' k- ^
  116. uses ... ActiveX, MMDevApi, ...;
    ( ^( z* o! L! X% X! c' \

  117. 8 K/ ~4 [+ _' C! q) ~" k$ ^1 Q8 h8 G  X) S
  118. //...... other code
      Q; B- m- y$ Q/ g/ i

  119. 1 {' R3 ^6 t% u  \$ N* X# s7 M! D, q
  120. var2 Y1 f+ D' ], P! i; R
  121.   endpointVolume: IAudioEndpointVolume = nil;
    + e$ |+ ~3 s) h: o# W2 r/ O3 b8 J

  122. # }1 a% `! h4 k' t8 ]6 `; F
  123. procedure TForm1.FormCreate(Sender: TObject);$ g! t$ r( }2 I8 s5 r4 ]
  124. var& u7 i# V: J' j) I* M# x
  125.   deviceEnumerator: IMMDeviceEnumerator;
    - i6 W* c( d- c0 C4 R! l2 v
  126.   defaultDevice: IMMDevice;( Z" u4 N7 g+ W) [! a
  127. begin
    " q1 L2 k# V8 ^5 P. c
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);. N# N2 S: D0 s; ]
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
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  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
    9 E3 z/ O! S+ N" t3 B
  131. end;
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  132. - t' O3 {- b/ F" R. M0 C8 x
  133. procedure TForm1.Button1Click(Sender: TObject);
    1 M7 d$ X) r, g8 C( h6 |# s
  134. var* S* T& O' I/ i/ [& f" ~9 P+ l. S
  135.   VolumeLevel: Single;# _; [: R# L4 G) R' g0 o( T9 C
  136. begin
    ! P1 O. v2 H% m
  137.   if endpointVolume = nil then Exit;" t' N* d* M* |
  138.   VolumeLevel := 0.50;: t, j4 w# \0 H% p  P: n, W6 f& _# F
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);" J/ X" `) j. I$ k  l
  140.   Caption := Format('%1.8f', [VolumeLevel])& f" f: F" r5 f9 ^- K2 q& L
  141. end;
    * o$ w8 b0 ]' \, H) k! l$ S

  142. 1 a+ X3 ]5 r) {
  143. /////////////////////////////////////$ }" O/ u9 D2 a, {, ]

  144. 9 G  n; [: j7 d# S( Y
  145. // with best regards ToxicDream
    9 V* o) C6 y, [0 K5 F, n
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