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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
  M$ V% P: T, ]: M5 L4 n/ W$ DBy Mukta & ToxicDream

  1. , v: c+ o* O* V/ k4 n4 Y9 x: q+ C
  2. //for delphi 5, \/ g* D% P$ E. _8 O7 p6 f
  3. unit MMDevApi_tlb;
    3 m# r/ X7 f$ c! s

  4. * ?8 `% H1 ~, v# Y
  5. interface) K2 e' x7 a  Q$ R, q& Z
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    ' l7 a( q8 n3 E2 _
  7. const
    4 E  k4 ^$ _. J! I: C4 b' `9 c. `
  8.   // TypeLibrary Major and minor versions) x& E  d" ~* y7 p' S" s5 `
  9. 8 x* X8 q( v$ W
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';1 Q/ j7 ?. |+ e7 p+ ^: Y
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';/ F' U4 P# P9 r+ t* V& F
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';) Z6 i. s: H" s
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    . x# b/ @* r, k
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    1 a: i" W0 Q) C0 X7 W& i4 \
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';: h  G0 e3 g0 A5 _% m5 m! ~" u
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    4 ~4 j$ k& i. _! d8 X
  17. 1 H5 n2 Q: N: O
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    ) [3 s7 b7 x) W$ `! V: t8 x
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    . o7 W# G9 Q$ x3 O0 ~
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;8 _" w; ^6 E8 |* R! ~
  21.   DEVICE_STATEMASK_ALL                  = $00000007;7 k* h: U6 [: v5 U8 v8 y

  22. . o3 x% V3 ]) X7 w2 @9 C  Z
  23. type
    1 z7 D' @( N* I5 g
  24.   EDataFlow = TOleEnum;6 I. U- O( C$ @4 X- {" S; ?
  25. const
    8 m) Z/ M# U! i/ y; E
  26.   eRender                               = $00000000;
    5 t) c& V) Q1 P' p# o
  27.   eCapture                              = $00000001;  i, Z2 _  F$ `" x- @2 ]3 d
  28.   eAll                                  = $00000002;4 y0 V+ N* {  ~2 z+ l) A
  29.   EDataFlow_enum_count                  = $00000003;
    7 I+ k- U7 H6 ]8 @$ B

  30. % B( ?& r% v2 B: f; J8 X" C
  31. type7 p+ R1 J# C5 j3 w& E
  32.   ERole = TOleEnum;! j9 _- w4 \' a$ a' L& j
  33. const2 O' @( \5 F- L- ?- U& Z% w
  34.   eConsole                              = $00000000;
    1 K! q3 S: a- o) b. q( O# C0 }3 j
  35.   eMultimedia                           = $00000001;
    / ?. C; _6 j- r% y# _; W
  36.   eCommunications                       = $00000002;
    : k/ K( \! g6 T3 n! K2 {  [" _
  37.   ERole_enum_count                      = $00000003;& }. e# h- L& v+ b) G
  38. . ~# |* D5 R7 d  g
  39. type
      [1 M1 D4 }8 u; J4 z# c
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    7 M: Y/ {  I# S( N; [" B
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']2 R3 G( V2 O' _/ v
  42.   end;1 u. q4 S6 G0 t# t6 ?
  43. # O, k$ O" d2 s
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    : E6 {- b$ m) L5 t
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']' P: c; X/ q! m# K6 z
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ! Y  H; w3 ?# q. v
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;+ \# ^( Q' \- s6 ]% U
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;+ O2 f: u* S$ ~! E. Z9 |
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;8 F( v, l8 ~8 l& V
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;0 C. f5 X* ^& `# `- h0 q
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    3 B2 j6 p2 k( A% Y
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;3 e7 M, G+ n. z3 g$ F! r3 s
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    8 n  V, s/ [7 S2 z+ U, d
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;) T4 O) S5 l3 ]( N
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    " z4 k( R& V# S" Q8 d
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;. R& e; Y  @: b0 M. m+ g) o4 `
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;7 Z! x. d2 ~4 I+ E4 a, o& Y/ N
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    % Z) V  w7 E6 L$ D
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    6 @, T1 x8 k* ?5 J5 w1 a7 ?+ F
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;6 z3 X* M! J. W) }$ s) `( y
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;: k1 M4 T+ r: {' _/ g
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;! o8 _) U) o: [6 J1 e
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;; l' [% ]- |5 t+ R# L
  64.   end;' H! s2 }+ k. C
  65. - G. N* o% l9 u4 T1 N$ l
  66. {  IAudioMeterInformation = interface(IUnknown)
    1 l6 [1 O: p7 I. u& G  G
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    # P( N% Q2 }1 B
  68.   end;}
    1 l& L4 y. g8 |# Z

  69. ( ~% U# L  Q" ]$ ]
  70.   IPropertyStore = interface(IUnknown)) \; U5 r. d/ D0 a9 m# M) T+ b
  71.   end;2 A  D2 {5 t, x& A8 ]; j
  72. ) l. \9 X: v5 {2 O' J
  73. type
      J# s0 ~8 ]2 C7 a; F
  74.   IMMDevice = interface(IUnknown)3 K; ^% z9 q) V
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']- D' t8 }/ h6 m  z  l2 Y. S
  76.     Function Activate(  refId :TGUID;
    1 H. x# Q5 d9 L5 O& J1 v7 ]
  77.                         dwClsCtx: DWORD;: u8 H5 ~/ |4 K- \  a0 X. \5 t
  78.                         pActivationParams: PInteger ;
    % ^# @" y+ |, v  F7 n( E! m0 w
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;( w1 }% T/ q' o% M
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
      A2 c- \$ @/ P9 U/ T
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;3 `0 C& F0 \! H% q4 W9 ?  ?
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    : m* O( W" M8 |
  83. 0 L8 h- Y& {; q. a" k! m
  84.   end;! D! M/ J6 v4 q* w+ t3 ?1 d" Q# i7 W

  85. / E, R" ^  b  a1 b- [2 |
  86. - K6 @7 v  b5 x& I9 G; V/ g
  87.   IMMDeviceCollection = interface(IUnknown)
    * f, \% N# a* N4 ^3 j. p( w) P
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']2 W0 w% k9 z/ I% h$ y
  89.   end;# a; u( w3 s/ m
  90. . \: y3 |! v) b! w- g
  91.   IMMNotificationClient = interface (IUnknown)6 H" t) T% `. f1 X. h/ \
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']( k# J4 p6 ]+ D; G- v- @, {3 h
  93.   end;1 _/ Y- J1 M6 ^8 J, k  b; G

  94. $ a2 e" ~, @( Y4 @8 S1 M
  95.   IMMDeviceEnumerator = interface(IUnknown)3 c7 V! t0 I6 M* q) f( b
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    5 ?0 }" C/ w5 ~! D" L. K5 _8 h. m
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;' r- n9 I7 [( G) u: S
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
      U8 U2 L- W" A: l7 d
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;2 I$ L( H' z  l: D; k# X! k
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;, J( O$ F) w- n& [; ^
  101.   end;
    5 x# M. b& u3 G+ O3 I

  102. ) s# E, B7 s; x+ l/ M% O, a
  103.   implementation0 R0 o# P; t7 l* ]% C9 b
  104. end.5 B7 j; O" I4 n3 ^# k8 I! s
  105. & }. L0 p. J) O: h
  106. Thanks & Reagrds,
    # B. f) H0 l( I, |. _/ O
  107. Mukta ...! R+ ]" ]2 O3 i: _
复制代码

  1. 1 D7 Q2 ^8 ?" ?' a
  2. it's work in Delphi 7; ~' W/ q  d% o. O
  3. //////////////////////////0 X' R& f2 |0 L: T. O6 O* T9 D8 z

  4. # Q5 ^% u0 |5 V
  5. unit MMDevApi;: t  h0 I9 @4 s0 [$ m
  6. * n6 o3 R0 s3 X- ]( K) h7 X
  7. interface
    0 }/ t( x7 y( f6 y6 J' b" U. Z

  8. 8 R0 V$ W5 m8 A
  9. uses1 n- o+ t( V: z1 J
  10.   Windows, ActiveX, ComObj;" W# G$ Y! {6 @' i9 }- m" v

  11. ! z9 g# ]8 `0 t
  12. const8 Z5 J" w- {* N6 i# H; o
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    7 d5 t3 v4 `1 c; f1 r& W# w. t; U- C
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    " T  \. U. y2 m: K- M1 w
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';8 {8 k/ |" N7 V' _+ \' _
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
      \2 M" V4 }1 O, n
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';) K+ p# o$ Y1 u  [# c8 t8 J
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    . P% f9 O3 A, J9 Y4 w
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    , \7 y* B- J$ ]% h
  20. + e" s2 ]8 ?( e2 o4 s
  21.   DEVICE_STATE_ACTIVE                   = $00000001;# G; c+ L1 y8 ?4 I# ]4 @8 V
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;+ w+ O( u/ H( C/ P! j) s) w8 Y8 }
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    " b3 E  {/ ?0 `# I# S( S1 H2 R
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    . @+ ?* H3 g  q( |  F

  25. & {( u! {0 O* t0 \
  26. type
      t# z& {+ y9 \
  27.   EDataFlow = TOleEnum;& X9 z  }9 Q- R9 |  \" E9 ~; h- x

  28. 4 b3 y% g9 p- }' z# |
  29. const
    + S% T9 d; E- Q* l* g) @5 Y
  30.   eRender                               = $00000000;
    5 l5 k9 I' D" O+ q/ c* @0 T! r
  31.   eCapture                              = $00000001;% G0 V) Q0 F# K
  32.   eAll                                  = $00000002;2 a3 m: Q/ ~$ A' F: K) G
  33.   EDataFlow_enum_count                  = $00000003;! r7 U$ \3 h( i5 m9 ~. Z0 ~# H. l- A$ c
  34. , c4 |* Z5 {5 W" Q* \. N8 ~
  35. type
    5 j4 u6 b" D0 I9 E
  36.   ERole = TOleEnum;
    * D6 W3 d: v/ Z: l2 N, K5 ~

  37.   w6 F9 e) [! z$ p! r. N
  38. const4 o, a$ ?$ s, n0 M9 }/ J5 M. H0 R7 K% O
  39.   eConsole                              = $00000000;  T+ p2 E7 a9 [$ N
  40.   eMultimedia                           = $00000001;
    3 u; [( ]  E& x+ o
  41.   eCommunications                       = $00000002;
    5 r3 Z0 p) l) b; a
  42.   ERole_enum_count                      = $00000003;
    " _( c( o% _  P4 R9 d# L
  43. , n9 P" `  X) Z. G( V
  44. type0 K: b+ M& N6 Y# |7 F+ u9 K+ A9 }
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)% `& ^8 E: O  \% [
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']! x$ E4 a8 T' I, Q
  47.   end;
    , a: C9 s4 J  f- r
  48. % S1 O, W4 U- t0 C4 p8 K
  49.   IAudioEndpointVolume = interface(IUnknown)' U/ M6 [4 D" E- T
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']7 _' J6 I& V: c9 F7 j
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    3 `: P# g' w5 l- n6 }  |
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;3 C1 O. C# ]! |7 c! Z6 Q& n
  53.     function GetChannelCount(out PInteger): Integer; stdcall;& L. L$ v6 M0 e/ i
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;- R) G/ s4 o, A# u) C4 X
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    - ~: q1 f/ J0 Z6 f$ q
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    . i/ M4 t$ V. g! Q9 i9 B
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    - h: g9 e& G$ |. r4 V
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;- z; X& ?$ d- P
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;6 g" A4 h  M& d! ?8 x5 h, O3 l
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    * h! u/ V4 }; B
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;  o& j$ J& H; V' ^
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;( ]; G2 c. ~6 u+ U1 r7 q7 ]
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;& L8 X3 A% m, \5 @3 i& \) s
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    , h4 H! B% y4 L
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    7 X3 [1 n+ x: j( `, U- y
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    8 c8 m: w; ^5 ?" C
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    , d9 {8 H6 m7 ~
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    0 R7 B) r- I$ a' @, \* d
  69.   end;# N7 M: |, M9 V( @; W
  70. ! M/ M! ?* r5 A% `9 o% a+ p
  71.   IAudioMeterInformation = interface(IUnknown)9 h! z* A$ ~1 j# c/ e0 o2 x
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']4 q9 C/ ?. X! _) T+ F+ l4 J
  73.   end;) @0 B# c4 @  ^+ O' R$ ^+ L% G

  74. & H5 ~; M7 r$ R) [4 a/ p
  75.   IPropertyStore = interface(IUnknown)5 s, m; _' T: K; o! y4 m4 B& h
  76.   end;2 {- s2 ]' T, M6 p

  77. : S$ w1 H. X1 ?( L. Z, u% D
  78.   IMMDevice = interface(IUnknown)
    ' w# |* m" p; F; Q& E* h0 W
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    : \! p5 V1 U) ~9 `
  80.     function Activate(const refId: TGUID;
    2 R4 V: I  k+ ^
  81.                       dwClsCtx: DWORD;
    5 {* Y1 G6 E5 b1 w, p2 {2 ]
  82.                       pActivationParams: PInteger;
    3 a( P# j/ h, j2 z3 ]8 ]( y
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    4 t  Z( _7 e+ g& R% s
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;3 z- E4 d" B. q& @' E1 q2 R
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;, B, I3 J1 F, ~" z* d
  86.     function GetState(out State: Integer): Hresult; stdcall;* ~& g0 P3 F6 R& J- o& u& m
  87.   end;: E$ g: l2 A9 b; R
  88. / ~3 V6 G' E% X3 D8 w8 }' c4 _4 V5 A3 B

  89. 7 F8 p# b7 k7 `$ a' S3 O( {/ ~
  90.   IMMDeviceCollection = interface(IUnknown)0 M2 _3 i" }/ i3 e
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    " \8 p9 _  ]1 d2 l
  92.   end;
    8 A& R' f4 J5 H* M" x
  93. 9 S5 s9 T: G% G4 ]1 S
  94.   IMMNotificationClient = interface(IUnknown)
    2 ]4 u1 S9 B* @0 W" H
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']8 Y1 s1 a- q6 F
  96.   end;9 k2 ^- e8 ]* B+ J' z' k
  97. , T  h4 C0 y: ^5 u7 c
  98.   IMMDeviceEnumerator = interface(IUnknown)/ }5 p1 ~: ~! @- _7 @
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    2 q5 G; `, O* n( {7 e
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    " I" f1 o, R$ }8 _
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;* A, ^, I7 j5 ~! G/ w1 T% X# m
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;$ S- @4 f4 o7 o; r
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    3 n0 J! d% e, N/ t
  104.   end;3 w# X  U4 C4 x) w
  105. , V" R3 Q3 q  k$ q# G# o
  106. implementation9 {% V3 O+ ]% l* ~# t

  107. , M! G( O4 o' q; F9 K
  108. end.& c8 ^0 G/ b' N( Z* V+ k0 j. D

  109. 9 y" {% P6 l3 F7 K
  110. ///////////////////////) }/ l( u! B) Y
  111. simple sample :)
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  112. ///////////////////////3 r3 ^  y5 ~0 r$ h  i# E5 }

  113. & |9 [8 ^. ~: ~* C$ K; O# {
  114. //...... other code* T( R% ]7 G2 A5 r

  115. ! L9 V, f1 y  y
  116. uses ... ActiveX, MMDevApi, ...;
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  117. . H2 u' L8 ~/ e4 Y
  118. //...... other code* J2 b. C8 N+ c/ Q

  119. * |' J0 C2 o+ w( c. `; J  R
  120. var
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  121.   endpointVolume: IAudioEndpointVolume = nil;$ e8 k" }/ R3 c# ]6 G

  122. ' p5 J' E! _, b$ ^- p
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var
    ' m$ n) A5 _' q
  125.   deviceEnumerator: IMMDeviceEnumerator;
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  126.   defaultDevice: IMMDevice;( F; U3 }5 U; d2 I
  127. begin
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  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
    * O! u2 [1 M7 g/ K' {
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);( ?, f. f; d# X" J5 e/ Z3 {; }
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);/ Q3 U9 C& ~& S2 L7 Q$ t
  131. end;
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  132. & J9 |6 y- Z8 I4 E- V% [: ^3 E3 z
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var. {$ x1 o: n1 g( X( Z8 P
  135.   VolumeLevel: Single;$ i+ P0 ?$ w# Z" g
  136. begin
    " z& w. K2 D( u1 `0 ?
  137.   if endpointVolume = nil then Exit;% \; f8 g9 W* Q% S, x  W
  138.   VolumeLevel := 0.50;/ r' o3 a' ^& h. ~6 t# i% ~
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel]); R& v3 o6 g6 M! q' r
  141. end;
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  142. 4 J6 c5 a1 D0 M# \9 e
  143. /////////////////////////////////////: G" c: ~+ b0 f

  144.   q: H; B, n0 A
  145. // with best regards ToxicDream
    # E+ Y  z; y- g; j6 u% {7 e* m
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