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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
0 k6 x& z( w0 n- }, n5 {1 D) RBy Mukta & ToxicDream
  1.   m$ N% e& U2 n
  2. //for delphi 56 z+ t+ x5 D6 o0 r2 C( r  ]
  3. unit MMDevApi_tlb;" w9 k' x' }8 \4 C
  4. * m! s8 g+ o' I5 q
  5. interface
    ' A, ?  Z1 F, e/ ~( a* L/ Y
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;0 u! Z7 y+ B  K, q
  7. const
    ; g$ F. M4 f) n  c
  8.   // TypeLibrary Major and minor versions/ D. m0 H& C: S3 S3 M
  9. . a* h4 w, p" O( D; g
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    : _5 H+ E- w2 {3 V0 r/ o
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    + l; u) `8 _- N# S7 o
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';. G8 O# f5 M; j% L: Z6 p
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';4 U! L* H3 y8 i4 S1 U& |& K7 [
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';+ L) `4 h8 V1 T2 O. l
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    ) o( _) P" d. D8 U
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';( `5 S% N+ n  z% Q% n  e
  17. 2 N$ c+ `0 H8 k/ |1 Y1 b+ q, Z
  18.   DEVICE_STATE_ACTIVE                   = $00000001;9 f# w0 e% N, o" C/ p
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    & r& a4 L8 G" j7 |' ?
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ) j( c8 x  Y4 |1 s; T' r
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    " Z0 }! o) E& T2 \& ?
  22. & I) q' ^. e# C5 V# f, c% u' f: |
  23. type! v. [7 B" M$ B4 I1 k6 ^0 A
  24.   EDataFlow = TOleEnum;
    0 e3 w; R. T/ B: E; q  ?
  25. const
    " y2 L2 h5 J% c3 y
  26.   eRender                               = $00000000;5 G* k: |, t5 z$ {- S
  27.   eCapture                              = $00000001;
    . K, p0 f  ?4 g: P$ ~5 n& ]! c
  28.   eAll                                  = $00000002;1 g$ Y+ j1 f+ K5 \3 i% z( D; J
  29.   EDataFlow_enum_count                  = $00000003;3 l* ?) A7 m- z% K

  30. 4 a$ q* }5 Z$ H# u9 Y; W
  31. type
    " _! U; {& a0 I* ^( P$ ^* E- Y
  32.   ERole = TOleEnum;1 j& ^- O. z: s2 h$ D
  33. const2 o  ]" M0 M7 l' o$ e7 g' T
  34.   eConsole                              = $00000000;
    ( S5 k" B& {; V6 v  W* d
  35.   eMultimedia                           = $00000001;
    3 Y6 h6 U0 b! `2 k
  36.   eCommunications                       = $00000002;5 m8 w1 Y% z" o! S& c
  37.   ERole_enum_count                      = $00000003;
    ! f' G9 I+ @4 k

  38. 8 l/ E! W) c; q% x$ Y/ H2 U$ Z" R
  39. type5 G0 _6 J- E) F# Z* r: F  J. N' j
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)4 s, n$ c# q# A) i9 t
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    1 {6 k/ W2 o3 u. a) L+ h/ a
  42.   end;
    0 @; d  t& j& O8 I: o
  43. ! I* Z9 h" J' R  M6 t! ?
  44.   IMMAudioEndpointVolume = interface(IUnknown)+ A# k  v" L6 l5 Q+ y2 H
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    $ B6 J4 k+ j) G: A8 W3 p# k+ Z
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    7 @/ D' M5 o/ `
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    , M, S+ e# N5 i' L0 y, v! z0 {
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    6 ^, q9 |' s2 |: d* Q
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;; i8 h' {% l' D' m8 t
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;- c( e7 S2 p2 t3 _+ u  d
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    + K6 E  [& T* P3 r% V' r
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    2 E; X: h, a4 l  [& a
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;- }5 K( s3 ]! [
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;+ w" g1 b, i" m  Z7 ]
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    9 l/ H( ^+ a4 n6 w3 \7 c8 N
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;% [& q4 L; u: x0 Y
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    5 J* t; z3 b, u
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    % e% z7 `' x# U3 [
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;2 E/ B# J; m' p: m( L2 C
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;; u+ H. r: s2 M2 o  T2 R$ r
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;: c$ n( A; G& y, e$ W5 l( a
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    ) D- W$ B2 u: _5 p, N8 |
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;7 [* ~9 N; H( e3 D
  64.   end;
    ( k% Y& M; q. b$ W5 U. k
  65. 4 D( [% E% |8 h3 ]3 ~: f1 p
  66. {  IAudioMeterInformation = interface(IUnknown)! b( D+ o. L9 v5 V2 s7 p
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    / I  {* o7 @+ }9 U' F! {
  68.   end;}6 U$ d3 f9 b0 t2 Q

  69. 1 j6 r3 g" \/ E# @
  70.   IPropertyStore = interface(IUnknown)4 Q% e$ i( h! J# o8 n8 j) o' F1 H
  71.   end;: }) O# ]7 Q8 \& e! b
  72. - D1 N# V' C4 F
  73. type
    , g. m4 [$ R) i- }( ]: S
  74.   IMMDevice = interface(IUnknown)
    . ?5 o. ]/ X$ e+ [. Y& W
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']$ S! ?1 k6 }+ C4 \$ \
  76.     Function Activate(  refId :TGUID;
    % N" H+ i5 ]! B" V5 a8 y( k
  77.                         dwClsCtx: DWORD;
    . j% Z# b- i$ W
  78.                         pActivationParams: PInteger ;
    ( _2 |. a- ]0 @; D! T: ]
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;" c* W! f1 f: Y5 I1 f9 j
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    ) M+ z- h& X4 n3 d
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    % E1 i4 G) ?7 T- }+ U9 Q& ^' a
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    - A, y3 @' W, ~5 [
  83. 7 B4 g; ]7 [  H* R
  84.   end;
    : l; E& [7 I( J7 @- ~$ R

  85. 5 V. V2 \7 d% O% Q, D5 O4 p' q' k
  86. 5 E  J9 o( H4 h& g
  87.   IMMDeviceCollection = interface(IUnknown), l4 F) N/ W5 s$ S2 S* i. [  F
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']; \+ q% r% z8 _9 r
  89.   end;
    ' m" q6 v  \0 c, I1 X
  90. 7 g& G1 p& h. z8 v
  91.   IMMNotificationClient = interface (IUnknown)6 X# r2 `7 h/ L% l
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']2 A/ @1 Q: K1 H" o  ]
  93.   end;
    " Y  y* a7 N9 R% s4 ~2 T

  94. : |, V( A* V! [5 N9 X+ T
  95.   IMMDeviceEnumerator = interface(IUnknown)# p4 @9 a4 T# Y* u
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    / M& |6 |2 S2 N2 w- g
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;8 ~, Z) m$ M2 j% M0 t8 A
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;1 z# R; S. S' h- a& J
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    , x0 b# |( N2 A8 A
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    - g; Q; M5 o# H
  101.   end;
    , T! l0 T- c  V& m1 ]

  102. 6 j( I$ I8 ?  |
  103.   implementation0 ?4 W0 K# w2 A/ M
  104. end./ }* `2 o+ C. f6 b- u, W$ t
  105. ( w* l, N* s5 p8 p' v/ u9 p
  106. Thanks & Reagrds,% @7 D! u0 l* H( Q7 H0 A) Q& N
  107. Mukta ...
    * D! h0 e7 Z) W- A' i4 ?4 \  [1 S
复制代码
  1. 2 W% R& v6 m, m* G
  2. it's work in Delphi 7
    5 R; u! q# A' i( n% R
  3. //////////////////////////
      s4 }5 x; T  ~# p* D; ?7 f

  4. 6 U9 v8 K1 t; ^2 e( c/ K
  5. unit MMDevApi;
    7 [# m( x; m0 K7 r+ J5 K" b& Z

  6. 2 s9 P2 U6 S6 \, B
  7. interface8 a$ w! H  l; q0 Q( }6 ]2 [
  8. ; \& T/ V; ^. V, J7 h/ t  r# }
  9. uses
    & c* D& m6 v# }" d% G
  10.   Windows, ActiveX, ComObj;
    % g0 }# `1 f2 g! c2 C* {
  11. 9 \4 @2 d" X+ Q! r6 @
  12. const& z0 o9 o3 a& T
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    4 f6 u: z" h/ p5 n0 k
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
      t* U% @4 G- @1 t" k) D( ]
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    9 m: p' z7 Y0 O# I# A4 r
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';  R" r( d3 M" q5 b- R, K/ S( w
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';$ Y9 P. R2 u* u( \6 d5 J3 b0 j
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    4 T* m# |8 }, o6 b8 G- O. P
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';+ G4 }0 C, l+ G4 n; }* I1 S1 ]
  20. ! ]3 ^9 u  e) r+ b. V$ ^2 Z6 R8 S8 ^
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    9 [8 J! ?3 u2 R
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;( `  W, ?% v. C+ B
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;' Q! q4 R, K' V
  24.   DEVICE_STATEMASK_ALL                  = $00000007;  N+ b: k. J" F4 a: [: [0 Q$ D7 c

  25. * E( ~" ]# g/ E8 S/ }5 I4 M9 P
  26. type: }3 y: I9 P" F, k
  27.   EDataFlow = TOleEnum;
    ( A  Z% f0 Q$ F3 K' |

  28. 4 C3 F8 Q% ~' n0 H. n3 \' F
  29. const6 ]- \; }' h) H, g
  30.   eRender                               = $00000000;1 L% h2 o; V! ^5 k7 Q! A
  31.   eCapture                              = $00000001;# ?- B* W- t0 t8 y5 I4 H5 K
  32.   eAll                                  = $00000002;
    2 F- ~" c9 H3 V- z/ z
  33.   EDataFlow_enum_count                  = $00000003;
    8 B9 ]1 E# [8 U, E* w7 e) K) m* M
  34. 3 ^# o3 S+ P2 u0 Z8 g" j" L2 T
  35. type
    : ~! m% i  P  \  U. v/ Y
  36.   ERole = TOleEnum;. _1 s( u$ a; i
  37. 6 a( X# g! g1 m2 A6 G) R# u
  38. const
    9 B% B/ N+ Q$ o" @" G' `
  39.   eConsole                              = $00000000;0 ^* f4 @8 X1 y" S3 I# z
  40.   eMultimedia                           = $00000001;
    7 |& `0 J- r2 |1 x
  41.   eCommunications                       = $00000002;. z: s* P3 q3 X  i4 o2 Y% s
  42.   ERole_enum_count                      = $00000003;
    6 v2 ^1 c3 ?  R4 [8 ^
  43. 9 Y1 p& {7 Q- Y- n9 Y( j7 l5 o
  44. type, Q+ [6 M. N% v3 O# |0 N
  45.   IAudioEndpointVolumeCallback = interface(IUnknown): u) j/ G/ d, F2 _4 y  A+ P) y" f
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    + P  M8 y' y5 `/ I/ r
  47.   end;8 |$ u$ ]0 W+ k* Z7 }
  48. " f, b/ y( M: a/ |
  49.   IAudioEndpointVolume = interface(IUnknown)! A/ S3 }# V7 ^' _6 h) z
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    0 r* a/ Z6 {' G* E5 n2 \# D
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    - ]" P2 [, L& e: P1 K' ]. O
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    5 @& F$ `; c& [; r% h4 i" [( T
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    / e  F% Q, z8 M
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;. D& C) x3 a9 j  j! u7 j
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;* h. R. A. N/ q' {9 |- l$ Q4 m
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    / D1 @$ m- Q' g2 F8 E
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    6 j; ~/ Q$ i) T/ Q2 X- T  y
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;: @* Y8 k( P; W
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    " V& ~8 g  q- s5 f+ m2 Z7 D# a
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;6 D& t5 Z" g  C$ h( H5 Y, i
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    5 q7 R0 e/ M3 X1 |4 Q2 n
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    7 y( j! A6 D9 C! q1 `- D  S
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;: t7 q2 P4 o$ a$ H! ]8 l, E7 h- K
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    " a1 C1 ^* z( d# h  H7 E# h
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    : j1 R4 g0 U& Y+ n
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;- c/ M# z" n$ S  `9 z3 u
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    0 I6 p. l, Y% r) v  y3 I! M
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    ; F, A! h" ]* v0 x3 N/ H4 [
  69.   end;" F5 t8 W' B, Y- r
  70. 5 @/ y3 r: Z1 w/ s% C
  71.   IAudioMeterInformation = interface(IUnknown)
    * s' ~/ @8 C' y2 C$ w. O. d
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    % {4 C+ f# t6 l) k; G5 M
  73.   end;5 k  b2 y6 l# {# c3 n! [9 ~" y) C
  74. ; V, r0 {8 i/ [8 p- w% ~$ N
  75.   IPropertyStore = interface(IUnknown)
    - A3 W- J. ?6 t* }8 L4 [
  76.   end;
    8 x3 [' C% J/ x

  77. : W( J) C2 t; ^2 ]2 L( S+ y# e: }
  78.   IMMDevice = interface(IUnknown)
    2 I: R* d5 e& }6 t0 j9 j
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    ( g5 f* B) J0 {% N& w, X5 \9 ~1 `
  80.     function Activate(const refId: TGUID;" b% [7 l9 Y" |7 ~; X
  81.                       dwClsCtx: DWORD;
    & I0 J" R) y8 o. M
  82.                       pActivationParams: PInteger;
    , d* w* ]5 v+ \3 P3 N% M; O' x
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;; E$ C% f; O% s$ s$ \* S
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;$ g" P1 ~9 ?! b7 ~- }
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;3 \. o' `- v1 q2 M" M8 u: C
  86.     function GetState(out State: Integer): Hresult; stdcall;
    9 r7 }' ]- `# Y
  87.   end;* p4 }6 f& M( f- i/ Y

  88. * s* H8 G# Y* T6 ?) Y

  89. * i5 D1 [% J7 E7 P
  90.   IMMDeviceCollection = interface(IUnknown)  t6 m6 O& ]; e9 m* Q
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']9 {; u/ E( D& g$ v& @1 X& p) \# l. Y
  92.   end;( L+ M3 Z! r3 G4 \' G% W

  93. ! K0 ]8 P1 r3 k; M( Z
  94.   IMMNotificationClient = interface(IUnknown)0 K6 \; i5 `" ]0 S0 ]# T
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']8 a/ S/ r1 j4 L" d- i
  96.   end;2 @1 L3 Q1 K; Q- h% ^1 y% w" `
  97. ) s# }4 }* v3 x3 v! I
  98.   IMMDeviceEnumerator = interface(IUnknown)
    5 ~! F4 `; \+ P1 T- m( U
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']* Z" @! s" ]* i, f3 z9 z1 q
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    & T' E/ {8 A" g  P1 L
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    ( u7 P( K; B3 J( X/ U. l6 w0 j3 ^
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;" r+ h% \- z, h8 x# n
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    ) i  P  J. G# y
  104.   end;
    : m% H4 A* ~3 g6 ?% Q  x/ u5 M
  105.   G1 X) u. v5 k) P* d
  106. implementation% y9 h0 L$ N# `" {6 w- I

  107. , I: o% {" L/ Z* x7 O
  108. end.3 c' z  V. r, U( D* r7 M

  109. 2 r0 V5 X  s6 e# e
  110. ///////////////////////" e4 I, e* L; _  y5 K
  111. simple sample :)
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  112. ///////////////////////& B6 L( Y4 Y! ~4 M
  113. 3 G2 E) X" Z2 O* R, T
  114. //...... other code
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  115. 5 P! t1 N! V" @: i1 o. h1 u* v
  116. uses ... ActiveX, MMDevApi, ...;
    % t8 `) ~5 c( k5 x6 |( Z

  117. % k( B6 `0 P1 g- H7 ]; L: i; b
  118. //...... other code% B% U0 }+ e+ B: g2 F" b% R4 a4 a

  119. 7 Y" i1 w9 S; }) G# |/ p
  120. var
    / s; G# t+ T/ S
  121.   endpointVolume: IAudioEndpointVolume = nil;
    $ [- R: k# q8 V1 n) h

  122. & e% h- |: w  z$ {+ k
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var! m" w4 H3 v0 ~  F
  125.   deviceEnumerator: IMMDeviceEnumerator;
    . v! U, [' B! ]* k! I. q
  126.   defaultDevice: IMMDevice;& f9 d0 J( C& Z, m9 @+ u; K
  127. begin/ a- y( q, n9 a2 H; g/ i# i! M3 A
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
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  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);$ b+ v, r4 X. P- R+ ^
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
    / s) x1 d* Z# |* ?/ U  o
  131. end;$ ^: a+ ?6 |' ~. o

  132. : k6 o( K) T5 Z/ s
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var
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  135.   VolumeLevel: Single;
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  136. begin
    + [' }5 L0 _. u5 b
  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;: ^* q* q; W% i1 k9 [4 N3 O
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);; g( \2 L7 }; V, O% L0 K
  140.   Caption := Format('%1.8f', [VolumeLevel])$ a4 g4 ^+ c( i5 e) \2 ~8 m9 v; o0 ^
  141. end;
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  142. + F" H. J1 i/ P. l. _
  143. /////////////////////////////////////& R! E- k' X: J( B- r1 A
  144. 8 d9 Y+ r. p; L# S3 ?, @* s
  145. // with best regards ToxicDream7 A4 j6 x7 e0 f3 I7 W
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