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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
; D# d/ \9 F* w* f. s6 QBy Mukta & ToxicDream

  1. 2 B) y1 S( a& u! f# f0 \
  2. //for delphi 5  v1 Q& }! x) q$ W# Q1 ^
  3. unit MMDevApi_tlb;7 Q2 z8 j, Y% N( L) O
  4. - i2 s2 N( h0 d) J% A, y7 K3 x
  5. interface
    9 W2 l1 M. U( t( H% \& }6 ^4 t
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    . z# x5 i$ u7 h" P* Q9 N0 E* ^& g
  7. const
    + D  R5 y- j, N+ n+ `
  8.   // TypeLibrary Major and minor versions+ W% h: K% f5 v. s2 H4 n

  9. 9 q$ K  J* {4 O
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';/ L$ D0 h, N6 M0 }: j& @! x8 T
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';9 d  ?- o7 z4 R0 \7 c) l
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    % M% C" J# @  ]. D
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    , M9 ^! M% x$ @; t
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    5 \4 }; l  C; p& _2 F2 h2 @: _
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';" |# g8 ]3 Z4 L0 ^/ `
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    % s7 ]2 G  |: _% |% q9 O5 d

  17. $ q& b3 i* R2 _) U. E
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    : k& B1 m" T$ z8 E% s  [4 H; W
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;. R* n, \: |- c4 }" Q
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;) o  e- E" r7 B; i; |
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    3 w: L. v  D# _* f! F
  22. ' I% U* r5 n( Q
  23. type
    8 @% Z' l: A8 v5 Z1 Z
  24.   EDataFlow = TOleEnum;3 B# G. m' J% a
  25. const- d' @/ K' j% j5 a6 q/ f
  26.   eRender                               = $00000000;  B8 d7 c) y5 p; c4 H3 h8 O# {
  27.   eCapture                              = $00000001;
    4 C9 L2 j6 g; h0 l
  28.   eAll                                  = $00000002;3 j8 T0 z( W4 @$ w1 \/ j' E/ f2 Y
  29.   EDataFlow_enum_count                  = $00000003;7 W" d/ G- j- N' U  e; S/ G: I8 s

  30.   H0 L8 }! H- Z' Z: \% |" A+ ^
  31. type
    - j# \( Q5 A, R: S* A8 e
  32.   ERole = TOleEnum;
    7 F/ f+ J& C* A
  33. const
    8 v* e. n7 M8 A. ?; p
  34.   eConsole                              = $00000000;+ y4 x7 b% p0 ~
  35.   eMultimedia                           = $00000001;% B  j. h# g5 l& {: E) f
  36.   eCommunications                       = $00000002;' [! U% ?: g6 j1 z& W- T  E
  37.   ERole_enum_count                      = $00000003;
    3 d- z" f& H* |+ G, J( d  U0 M, X
  38. 3 |6 d* Y# `# x# `/ E# a6 t
  39. type
    $ k- M9 o9 {& t! r) V% \
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
      p- ^: U4 i# V( E
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']* U( E  }. @" d2 j3 y
  42.   end;4 d7 n3 e) A3 r5 y7 y  |

  43. 3 S) L) _( Y0 Q8 w" D6 ~. O: ]
  44.   IMMAudioEndpointVolume = interface(IUnknown)0 U/ g; ]$ F; t4 s1 ]* i
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    1 i; k( x6 M* W7 q( r! o7 E6 D$ x' D
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ! Z/ k% z6 [0 ?7 J1 T0 q
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;; C. o2 m& ^' U! D6 s
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;$ f0 n; U0 X. w3 J: C
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;/ {# ?: o: r# ?
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    8 m$ \; K) o) g4 U
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;1 T3 N5 l9 _+ c: P- e4 |
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    + u$ J5 {, z) s8 V* s- X
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;+ r. M, P) R4 f9 \2 ]. u; F: r
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ; O2 Y3 d6 r* n8 R% j
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;7 z- c1 _( f' o( \6 {4 w# F
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    - ?0 y$ G: N* t( L3 b  h9 i
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;7 a4 a# m* b/ O$ T  \" m1 P5 O
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    5 L0 s9 S- g$ s: U6 S# B
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;8 `& W( r8 n0 ~
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    ( s) E6 W# f. {
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    ) x' u' s% w0 A6 \! N
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    6 ~9 ^. }5 |7 N8 t
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;: Y4 D  n" x, d( b+ H" _5 w- ?
  64.   end;
    $ Y' D( F4 t, c; z. X# I* }
  65. . A; W% V1 ~+ H' c* A& i
  66. {  IAudioMeterInformation = interface(IUnknown)+ v8 S5 \. \, @1 n5 C( Y
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    4 X0 U! I9 g9 z7 ^5 E% [$ m7 ?
  68.   end;}# o# P. l0 a& `% I# r' @& {1 @. f

  69. ' w$ P+ A4 v0 s0 U1 |8 w$ H
  70.   IPropertyStore = interface(IUnknown)  d" J# H9 h* L$ K3 {
  71.   end;3 V9 ]9 q! |/ q

  72. ( v, t- G( o1 N6 l
  73. type) k1 k+ |9 @+ _
  74.   IMMDevice = interface(IUnknown)
    9 L) T. G; F1 l7 |3 k3 b% p
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']0 ]5 l' A- A7 [0 {
  76.     Function Activate(  refId :TGUID;8 l8 V" s% @- L+ f$ i( Z
  77.                         dwClsCtx: DWORD;
    - J0 m- V' t" m3 m# L$ e
  78.                         pActivationParams: PInteger ;
    9 s  i% C3 a( ~* v, Y5 S+ v7 v& B
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    3 f* d7 _' E" l1 \
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    6 m5 |* l; c7 @: {, C: r+ x
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    : \: A; q5 o  R; W7 c$ z
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    % E" \% A7 M$ H1 e
  83. + G' a& Q7 H& r- y+ l! C' G( t& g3 m
  84.   end;+ O" ]8 N+ A+ R0 S9 u: H
  85. 2 M; D9 o% t" u7 X. _: O

  86. 6 R7 m* ~( l7 ~
  87.   IMMDeviceCollection = interface(IUnknown)5 v0 a" v; o# U* w! {
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    4 b8 n# v% v% A) S8 P$ O' P
  89.   end;6 v& p" E2 K, l: ]' \
  90. 3 t  _5 c: j8 B; E2 {. G
  91.   IMMNotificationClient = interface (IUnknown)
    : s9 s6 f: C0 X3 n, H$ l0 Q
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']6 M& k( V* G$ w7 k, G1 z
  93.   end;  m2 m- f' }% B9 I, Y2 {

  94. 2 W9 r. `/ F( n* @
  95.   IMMDeviceEnumerator = interface(IUnknown)5 H  w- d$ n" o  j$ v/ n1 G
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    6 x8 [: a8 g6 J4 R# G5 v
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    ) T2 U0 _; j( Q! F
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;( A  m! X  W( y7 h/ i. a
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;& S2 K2 \1 ^+ T0 c! Y+ K5 B# j
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    5 b9 Q" T/ j: e, n" f
  101.   end;
      h. p5 F/ q# ?1 }1 _, L: V
  102. % {9 M8 ?/ D0 [2 R* V+ ^' d
  103.   implementation# E6 m6 T2 J2 y+ {/ g5 ^; y) n
  104. end.3 C! s! H6 w( @0 q
  105. 5 U3 ?. V; u+ W2 i
  106. Thanks & Reagrds,
    0 c2 N! U* E: f9 q( W
  107. Mukta ...3 S5 o7 p2 u; Y2 ?
复制代码

  1. * t: d  \% @7 G- U8 y1 }2 _( s3 J
  2. it's work in Delphi 74 r7 e. ^; i" s+ e$ S$ a
  3. //////////////////////////
    ! d* u* }8 D" \1 ?( w6 x7 q+ v: |

  4. % I" d! `) S5 x- |
  5. unit MMDevApi;
    ( D+ `+ ~, c% i: \# a

  6. + U9 i( {* ?: s6 B: E) g' e
  7. interface
    & m" X& G0 p6 t1 v+ _# h
  8. + T, v; y! H1 B: M
  9. uses6 r; S, ^/ R% \$ ]# Q, E. W! p
  10.   Windows, ActiveX, ComObj;
    - F% Z$ ~1 U" `% B6 F( R9 c
  11. 1 C% j6 X3 `3 ]: Q+ u/ k  U
  12. const2 ~* C+ u# v5 [
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';( W" G3 S$ L0 s- G5 q" C
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';- x. u( S7 K  q% b1 z! e
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    ' A+ S' x9 E( c5 S
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    9 x, Q3 p! P. J" J8 D
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';7 Y8 ^, K$ p. b
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';% Q  c& O! Q1 p4 m
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';& ~) g1 a9 t- e. l. L

  20. 5 u/ I( t) W, G6 O8 D
  21.   DEVICE_STATE_ACTIVE                   = $00000001;/ L# C& i3 S: N6 ]- A" S
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;( T0 b: l* Q9 {/ H7 R' M
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;4 M! X% P; r- H) o5 `4 U, q2 k) j/ ^
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    . c& A, c$ H& H) |9 C

  25. ! y* @; t  J3 }- Y
  26. type
    1 y% ^5 x5 \; s7 E! ~
  27.   EDataFlow = TOleEnum;
    * j# Z" G9 p- |* _" W6 O9 b
  28. " c' J& C6 U8 I  u- i6 k% S$ A  `
  29. const- G6 N; w% N3 J6 k1 l
  30.   eRender                               = $00000000;: D9 |3 \/ |4 m& T" x
  31.   eCapture                              = $00000001;
    : ]0 Y* m+ u9 t7 k/ J
  32.   eAll                                  = $00000002;, y- a& K- q: e, [$ ^
  33.   EDataFlow_enum_count                  = $00000003;  ~2 C1 a3 F# V' _: n7 U

  34. % o) J% [( }* h8 v( V3 ^
  35. type  v) a! v, l) Y- t& o& m5 R5 O) D
  36.   ERole = TOleEnum;
    ! z' R( P: _* z! O# o$ f" q& k

  37. / [: S5 w' o' ~* L( j' C
  38. const
    $ m0 E# `$ B  ]9 ^
  39.   eConsole                              = $00000000;/ N7 k/ m( s9 k: N6 y
  40.   eMultimedia                           = $00000001;: H9 b% B0 \# B$ @' [$ a6 W
  41.   eCommunications                       = $00000002;
    $ Z; {" B: y- R* F# L9 U. Q
  42.   ERole_enum_count                      = $00000003;
    ' ~# v3 o6 X  U4 \  c" M3 y2 G- I1 ?

  43. + Z! `6 r  \, \# M# z
  44. type, G6 g% p$ N3 i! l( c- O. _
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    " h% e; I" G+ B: s2 m8 F0 S5 A
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    7 g5 f9 N3 E  N. t5 `8 z7 K9 J+ p/ j
  47.   end;
    5 q" b3 ]5 r4 O% w
  48. ! P  z! l0 D+ h' m' V; _
  49.   IAudioEndpointVolume = interface(IUnknown): F* A( C  j1 l) x! }" e" @
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    ; s6 D( h* t- w5 n; N  C! X5 q3 n
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;, u4 ?8 k" v) ]2 o0 ^
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;2 C, p  N+ q4 V& H$ [8 V# Q
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    ' a3 R, U: m; I9 ~9 D2 Q
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;6 `( e/ N% H4 Q8 e3 ^/ h
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    ( {% N6 F, u0 M% n" T' M6 u
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;7 U- B$ c  f! v" }
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;0 x. U) \( {6 G! h& E1 Y$ \
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    7 \9 o2 H8 s. Q
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    + ~: h2 n& O3 Z" a) c
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    5 d' E7 m$ u9 m0 }
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    * W0 v  f: ~: s) q' T
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    0 y( i" s' h  @) O
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;. J1 R' T5 h2 T- C6 r$ C4 s' ^
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;& P" i' w8 u+ `# C7 o
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;6 T/ Z, Y1 @( \$ d1 y# i& |! u" j
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    " u( }( ~- N2 c' U8 }: X; f- `
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    2 w4 ~' f2 R( O
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    ' I% ^1 t- U+ B% T
  69.   end;
    ' ]  D$ G: s6 Y9 [
  70. 0 j- M7 f$ ~4 _6 S& t+ e
  71.   IAudioMeterInformation = interface(IUnknown)  q9 m3 p* j# Q; l+ Z3 A$ ?/ S2 C! T
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']$ z* I9 }$ \9 D% c7 x+ `, O
  73.   end;
    9 d3 u+ x7 Q+ Q( U4 r
  74. 2 l* t9 ^0 r- F' \# r  c  n' q
  75.   IPropertyStore = interface(IUnknown). W6 p* ~. [, D' Y
  76.   end;
    & J2 w3 j% _% N! S: `  m

  77. 7 A; i* t& I: @3 L
  78.   IMMDevice = interface(IUnknown)
    # {" ]$ f' A! E+ q
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    $ E' g5 f$ V( k( U
  80.     function Activate(const refId: TGUID;
    0 R# Y0 B% {  C5 F
  81.                       dwClsCtx: DWORD;
    8 {6 b  [* @7 G; e
  82.                       pActivationParams: PInteger;9 u9 R$ |3 r: C' |* q
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    0 x5 A0 m4 l, R' H
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;; q, U. Z! Z/ X8 a/ _* O
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;! H! ^- y' A& |$ }; e$ R
  86.     function GetState(out State: Integer): Hresult; stdcall;9 Q+ }# T' V; r% @& k
  87.   end;" U( R* `, f7 K* b2 K' a

  88. : d( O$ i# U' I/ @) }
  89. ! |* u: Y: ?+ `
  90.   IMMDeviceCollection = interface(IUnknown)8 p3 [/ F( Q. P# Q# [3 N) Q  c( `3 x
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']7 B0 f1 I& t5 y7 o1 u% x
  92.   end;
    " w7 h8 K2 U4 S& q; v' [$ p

  93. . P& d$ C& d9 m+ R5 f' B2 [& l
  94.   IMMNotificationClient = interface(IUnknown), ^  m1 l5 q' H. S  l/ d' b# M
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']4 {; d' y9 E5 _
  96.   end;! K. v7 L# N0 U( u
  97. " Q+ \4 D2 S+ j1 f
  98.   IMMDeviceEnumerator = interface(IUnknown)
    + \4 T- a, H; U% x3 G5 f5 r1 @
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    : T' a9 t$ x2 T5 H
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    1 @6 n/ l+ y+ q) Q5 q# R* w& I
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    ! T  g: w2 j9 A5 c; `
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;( Y) y4 T3 T- V1 ?" ^+ J$ @% \9 v
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    1 a% t9 |: M0 {  b( P
  104.   end;
    ! \5 L0 m/ z9 ^/ v1 q0 y6 Z

  105. : {: c: ~4 ~8 w
  106. implementation
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  107. " d( g6 p2 o7 W8 x0 y$ s0 _( t; D
  108. end.
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  109. ' ?, J. @# d: a7 n
  110. ///////////////////////
      b" ?6 W8 q; n2 D6 g" _9 m
  111. simple sample :)& P& l) m; P* Y1 U' J% j/ ~0 p1 c
  112. ///////////////////////5 q% @9 H6 N4 I- n# J
  113. ) s- y  H( Z5 U* {* L: m- ~
  114. //...... other code. T% ?+ w  o! Z, l  a9 C* K
  115. . r+ K: l/ t8 d7 w
  116. uses ... ActiveX, MMDevApi, ...;
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  117. 4 ?/ q6 [9 H5 Y$ ~, [: M
  118. //...... other code8 o/ [. J- e# C0 y2 g

  119. 7 h1 s4 d3 l0 V" h  Q: z9 f8 U
  120. var. r2 w" k! t6 I# f5 L; U
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. 0 e9 ?6 y* S0 q# g! N8 g( s
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var
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  125.   deviceEnumerator: IMMDeviceEnumerator;0 T5 _( }5 M3 }: N
  126.   defaultDevice: IMMDevice;% z! V% \4 \: V6 f
  127. begin9 z0 G: m! Z. i. U8 L$ M
  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);
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  131. end;2 Q. v$ F7 h9 d
  132. 5 u9 a+ L7 b9 b0 ~+ ]
  133. procedure TForm1.Button1Click(Sender: TObject);$ Y3 |( S  z8 |! D+ p( D4 s
  134. var
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  135.   VolumeLevel: Single;( a' |1 P1 O; H5 h% X4 j/ f+ Z
  136. begin. ^! q! M8 H: @4 [' W8 W  V
  137.   if endpointVolume = nil then Exit;5 `& B: R. \' `! z) \
  138.   VolumeLevel := 0.50;
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  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
    2 I$ m0 S! m  c0 l9 v/ b+ n

  142. 2 N5 w0 Q3 t' A2 `$ j, b- i
  143. /////////////////////////////////////
    " U. e  o: J* d& z

  144. 3 J% ^# Y6 d. c! i" v9 u2 ]
  145. // with best regards ToxicDream
    ) P6 z1 Y  ]6 \
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