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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* e7 _& O6 }8 `, L! T. ?: m
By Mukta & ToxicDream

  1. ' _( t+ ^  g: m2 [
  2. //for delphi 52 N0 G+ _" ?2 D  G
  3. unit MMDevApi_tlb;
      l# o0 _. p' X- M; P: w. j

  4. ! \  L5 l3 B# \; h
  5. interface
      E2 k( s- z4 j0 C2 K& R
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;& N  z4 e+ J; ]" g) s1 A
  7. const
    2 E* F+ ?$ ~8 b; O, t- O
  8.   // TypeLibrary Major and minor versions
    $ F1 Q. z; |" k3 Y4 e
  9. 0 s3 r; g6 T; p# E) ^& {' D1 k
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    ; H8 w: f0 W8 ?. C
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    7 o* B! j  w% `% t, s& a3 g  e
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    # G7 n  l5 D5 j  p9 r7 L
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';, Z: N+ M1 y! V5 X. Z3 J  Q- A
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    4 n5 F: @; i2 Q
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';% z8 Z$ h1 e* y( @
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    * s/ J. L3 M; A9 V/ b* r3 W

  17. 3 s- f% D) T( s; R4 D
  18.   DEVICE_STATE_ACTIVE                   = $00000001;8 u" w- s7 d: h$ ]
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    * n& m# B  G- d
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;+ G6 @, H  ?" R* }" u" [% r
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    + A5 k$ J4 U% F" \2 Z' z* @) O" F5 s
  22. / W0 j3 @* i3 U2 ?1 r
  23. type3 D" I; ^8 @; F0 p1 H" r
  24.   EDataFlow = TOleEnum;0 l8 |, X( ]/ v5 ]- z, ]
  25. const
    6 u, ~! O7 N1 |- U5 K1 x0 o
  26.   eRender                               = $00000000;- \& w5 d. e* O) \% F' g
  27.   eCapture                              = $00000001;$ b# v, Z( l' X+ n
  28.   eAll                                  = $00000002;
    . X- k6 c$ w; M* o5 \% ]  Q! j
  29.   EDataFlow_enum_count                  = $00000003;) i2 t, s4 k' g/ R7 P3 U2 w0 I
  30. ' f5 K1 _3 W1 j. K1 P% O
  31. type
    7 A  z7 @/ Y7 J3 }; g$ t) d
  32.   ERole = TOleEnum;
    3 Y8 ~% @3 t1 ?* @; ?7 a! m
  33. const
    0 K" ~" D$ M  J
  34.   eConsole                              = $00000000;
    / z+ {: ]9 w) v, t& o' m5 U, L
  35.   eMultimedia                           = $00000001;8 S' H! K+ l' a! u/ r6 u1 a) r
  36.   eCommunications                       = $00000002;
    % c! M8 ?# K; t* G6 |: C
  37.   ERole_enum_count                      = $00000003;
    " C% M" \. D# M7 J$ ]' v5 s

  38. # y  j3 s- ~2 g+ F5 O& c0 P
  39. type6 Z: Q% I, K  m- l) I, U4 s; S
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)  m1 P, x$ W+ z* q, s* i, ~
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    3 ]2 m) ]0 d( Z* H7 u1 G# {. Z! z
  42.   end;
    ) Y' G* r/ f( B1 N4 b; ^

  43. 8 a& d4 A6 v$ O1 E' b6 I9 t
  44.   IMMAudioEndpointVolume = interface(IUnknown)6 j, c- n& u; ^2 y7 O
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}'], I! u& T6 b* s3 |7 i$ c( `* p
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;: d) \! K& r( s6 R5 r% x# m
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    5 c7 k8 q% Y7 b4 T: N7 Y
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    % ]) ^+ x" x  _8 F# Z6 M) D) B
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    8 T- f# u" B+ S7 }* @$ v& E
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    + v4 F3 k: A; [: d  u
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;; F5 V3 H3 ]% o3 F8 g& A7 m) I
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;  r: u# h( i$ X4 ]: m" q
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;6 c# ~# H% q; H  r' l' I3 m; |
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;5 N- {* s; i& T; m
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    5 O7 R4 L( Z# [/ o* e) u/ c$ P6 O
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;# `  l3 {& T7 w% t( N# k
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    " D8 N4 R+ ]& {& x
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;" [6 Q1 G* O% B! d& ^, S
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;3 ~6 C" n! i  z0 V. @$ ?: r3 q
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;: m+ @! x2 Y3 Q# s" W
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    - e: Z  ~9 G. m6 H& V
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;' }' w: |$ M, Q
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    2 v8 x& t3 \- s% H7 X
  64.   end;
      U4 L' O* j+ j1 O- N- \. V) l  W
  65. 3 Q% Y9 q; t3 ~7 ~5 ?
  66. {  IAudioMeterInformation = interface(IUnknown)# V1 H' @/ ~; v' r) V
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    6 J" e$ f/ R" j1 Z* h
  68.   end;}
    ; a5 \1 L4 n+ K
  69. ; B# w, K9 P! F2 ]/ r
  70.   IPropertyStore = interface(IUnknown)
    2 m* a) ], B6 f/ D2 u# _7 c) ?  }
  71.   end;
    2 V) k9 F3 i( \$ w& g

  72. " \% F  a* g; d3 E* f, M: S
  73. type5 |4 }* n* e& k7 C& k
  74.   IMMDevice = interface(IUnknown)+ K% c1 x/ i1 X" j
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']( S) ~- M, Z- R+ y6 K
  76.     Function Activate(  refId :TGUID;; W7 J# U/ r# f& G! c( R/ p* Q
  77.                         dwClsCtx: DWORD;) @3 i3 p' B  h, f
  78.                         pActivationParams: PInteger ;4 W+ o" H) h! m& d% d+ \- V3 O3 l
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    ! p" Z: P8 S. H4 C1 L% K0 j$ _3 G5 p
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;5 [& h; o( B& l* h5 j
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    $ t' n& f& S( D" m# m' ]6 k6 V
  82.     Function GetState(out State :Integer): Hresult; stdcall;7 c2 Y, X4 L  ?0 l" W. I( U  z5 E

  83. : j$ f+ b, }( j. P1 C& h
  84.   end;' L7 }8 b: _) b$ ^! O9 Z! p5 e! a
  85. 1 X4 W3 N3 E% C( ]

  86. 1 R& v5 l7 T5 \- B, [
  87.   IMMDeviceCollection = interface(IUnknown)
    ' x  H. F+ K  R, n: \  {  g
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    % g' \, A9 K3 _: h+ M
  89.   end;- ]6 U) g. N2 G/ I, \: N
  90. 0 |0 o9 R% \0 i/ _: u( r4 Y
  91.   IMMNotificationClient = interface (IUnknown)0 L+ W7 c/ U0 O, _% G* O
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']6 d* \' z- ?  P9 [  G
  93.   end;
    9 e6 j/ P; U6 b0 Y
  94. , I- q6 ^$ R; o
  95.   IMMDeviceEnumerator = interface(IUnknown)4 p6 N" b6 E/ K! |; F6 u
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']0 ?5 |8 Y) f4 {! ?
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    $ h3 k: G3 T% K# A4 [
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;2 y8 s, Y7 F% q1 ]2 D
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
      ~: D# d: [2 ~$ e  ^1 o; r
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;9 Z8 m+ {! U( m2 {# \1 r/ }
  101.   end;
    ; F) ?4 c1 B* x$ c- D

  102. ' `9 u" c  s3 R" N6 @; W2 ?; w
  103.   implementation
    0 F: s$ @+ B4 z% N
  104. end.
    7 m! v7 M9 @% t8 g, y
  105. 3 h* Y* B/ {# i2 w" E
  106. Thanks & Reagrds,
    * u- q9 x+ @% B  N
  107. Mukta ...
    1 M0 g: P1 H& \* g5 S0 c3 F
复制代码
  1. % z3 [3 L7 q( p0 x& o# z
  2. it's work in Delphi 7
    ) l/ J' w1 e6 L* r+ }
  3. //////////////////////////
    ; K+ y9 A& @* S& ~5 b1 E
  4. ) G; u2 {, D/ \# m9 y8 ]
  5. unit MMDevApi;7 I1 V2 m8 U# T1 I8 T$ m

  6. 1 {# h7 b+ s6 ~% f* S# x( O# A
  7. interface! t% {) N9 h6 B4 m. w0 v2 `

  8. * K; l+ v8 z3 R! m$ I' t
  9. uses
      @7 K& ]$ R0 X. e0 E6 S* _
  10.   Windows, ActiveX, ComObj;
    , U4 o: Z. Z( A5 `9 O5 C# H" a. r# G

  11. & i7 Z: l, K5 M/ m
  12. const# g0 p0 B, X2 O3 ^
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    8 o4 y! k& d! d6 p2 V' N+ _! ~& P
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';. g; s4 Y" g. I! Q2 K6 ^: A- n5 c
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';: H0 ?: F$ f0 s0 Y
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';6 Y5 V- v0 {5 |: z! v4 d
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    6 Q5 f" t4 z1 C% G( i# w
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';# t, G: g+ _3 {0 M( M8 e3 O  |
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    5 o4 t$ |$ \* \1 J" C! c5 f

  20. / p% ~; k" g. H0 \+ M
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    1 y8 U3 t2 a; I4 C& X. J
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    ! r- S" m) y) N& {& S
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;. _8 Q6 u7 D3 n" M& ^) A; D
  24.   DEVICE_STATEMASK_ALL                  = $00000007;, }2 v0 r+ p8 c! P. o' s# A: q
  25. . w8 M2 W: _) G
  26. type1 Y5 S! N7 W* c/ _( R6 F
  27.   EDataFlow = TOleEnum;# o- @: |5 z$ r, J7 h

  28. ! P% Q7 _  t/ v+ f4 _
  29. const& l. E- b. v( {( W4 ~3 L
  30.   eRender                               = $00000000;
      Y  }0 F( z3 w; L4 O" ]/ t6 l
  31.   eCapture                              = $00000001;$ v, [- f* x9 ^7 w2 [! d
  32.   eAll                                  = $00000002;
    : Q4 R4 s; d' Z. S! s
  33.   EDataFlow_enum_count                  = $00000003;
    4 c$ U  j, f3 l6 I8 [
  34. ; i& k0 l; p: @) _
  35. type/ f1 `% k4 k( c5 h
  36.   ERole = TOleEnum;9 z+ Z5 w! \6 j" E( F0 w4 {# v# @$ c

  37. 3 o. g  _. o5 f9 C) C* i5 N
  38. const: l3 h* n: s+ M& R, M1 Z2 c
  39.   eConsole                              = $00000000;
    ( S3 A  `2 g" d# {6 a& g
  40.   eMultimedia                           = $00000001;
    % u  ~& H' C( z+ ^6 F2 @, c$ O
  41.   eCommunications                       = $00000002;
    . P9 I# o$ O) s6 V& r
  42.   ERole_enum_count                      = $00000003;
    " V! _! P* `" x: a7 T8 H- w1 }9 l. G) F

  43. " O& X/ B/ O0 R) h% o# j& Z4 B9 u; ^
  44. type
    / f( H$ F" H5 J% s4 h
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    ( e3 R. x$ O+ Y$ l* y
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']7 J% G: z! o# M
  47.   end;
    ( W+ N# [# |+ B3 y' b/ n6 l  i' Z

  48. & t+ d5 X4 U( V: L( j' s$ Y
  49.   IAudioEndpointVolume = interface(IUnknown)
    + D, v3 T6 ^8 m, l
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']7 H) [3 j  H3 h9 d1 q
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    4 e5 q- {: \: O2 _: h- A8 C6 s
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;* v" ^! E1 @% b9 t7 H
  53.     function GetChannelCount(out PInteger): Integer; stdcall;, s3 j4 x! U- Y) _/ _- O1 E
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;: |0 }( v# z6 r. p% _7 o* G
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;$ r- l, p3 R% d, i/ M6 U, D
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;4 y9 p( F: T- e9 ^
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;- d1 c1 \9 @4 G$ O
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ( A: M% _5 {7 s
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;% B0 v5 [' d' }( a9 n
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;4 e( {4 N9 a9 ~
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;! R+ G0 t# o# i
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;7 F! o# \5 P6 T7 i8 ]: d
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    0 O) u. G- Q2 C9 m) N& o
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;/ ~$ {3 u  R/ P( w( {* P
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;! N3 X, T' [0 ]5 ?8 V0 z
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    - n- v( |$ K( g6 {  z( O
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;/ n( D' Y6 t' z+ s. U% f
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;& F3 f# G7 p8 B; ?* G0 y
  69.   end;
    * f; o! c! R1 {" Z( R

  70. % S/ Q( E; U# y" @+ r' g% |6 S1 D
  71.   IAudioMeterInformation = interface(IUnknown)
    : R& u9 `+ U) F* w5 M5 p
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    ! [& e- |4 J' n( F9 @$ v! }9 s6 v5 H6 E
  73.   end;
    5 e, J7 b5 w& Y( G% w/ ]- s
  74. . k# p1 S( S: x9 T
  75.   IPropertyStore = interface(IUnknown)1 r$ ~9 @8 `2 T9 B& f& b
  76.   end;
    ( c& i6 D1 }3 Y! U+ M3 K

  77. . R) V  c' O2 s- |" Q- E
  78.   IMMDevice = interface(IUnknown)) [  m: I" F! F
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    3 @; E% g2 A) r/ M5 U
  80.     function Activate(const refId: TGUID;9 ?7 u$ q6 I1 K4 v8 A% |: P
  81.                       dwClsCtx: DWORD;1 h5 A  O/ |/ i- o
  82.                       pActivationParams: PInteger;! n! A4 m$ }; ?
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    & k$ y1 F5 d# u' e* F) r' f
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;/ n. q2 f1 B2 D' @# y5 J
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;# ~6 m) _4 A- f2 F; q8 f: H- o
  86.     function GetState(out State: Integer): Hresult; stdcall;& W2 l( u0 B' O( i6 @& x* ~2 h
  87.   end;1 B) W" y% q& q- b( O. S3 E/ N( u' E. \
  88. # [2 y/ l; D4 a. s7 f, n

  89. % d" y& J5 X: X+ |, D
  90.   IMMDeviceCollection = interface(IUnknown)
    & b2 s# c8 P4 B. E. N7 C
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    $ q# r6 E+ c/ R
  92.   end;. N4 p7 o' s! b8 Z

  93. ; [3 U( R2 n( z
  94.   IMMNotificationClient = interface(IUnknown)
    / |0 j5 Q! n; A( v, A
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    " t- X) B5 P# ^8 o4 O8 O
  96.   end;
    * [* }. M+ u" i, P

  97. ! U; T) |1 J' D9 R  n- V
  98.   IMMDeviceEnumerator = interface(IUnknown)
    8 I6 M/ u5 E; P6 l8 f$ c
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']6 c/ W, v! ]3 {9 N9 r9 t
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    ; y$ d  E1 ~% A7 Z& I
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    ) x+ u& c" U& U3 Z
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;$ z' [. o( ?' l) M
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    ( c8 V. ^- t: u& A- T- T
  104.   end;
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  105. 2 i4 F; ], t6 S) N9 g
  106. implementation
      @% l! s% R4 G( f# ?: p2 C  S9 H0 }

  107. 9 M" \$ j7 G, F# X
  108. end.
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  109. 4 c8 ?7 M( |9 K) l  S
  110. ///////////////////////
    % Y5 I+ }9 q% ]' n2 i" c
  111. simple sample :)& @8 k$ C( K* x! Y
  112. ///////////////////////4 p# t; ?* b2 d5 A
  113. : y! i8 f7 [- P3 C0 E: K2 D; Y
  114. //...... other code
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  115. & }- ~' y3 x1 y
  116. uses ... ActiveX, MMDevApi, ...;
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  117. ! ?; q0 a4 I) P6 _# q
  118. //...... other code
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  119. ) j1 z6 V9 E: N7 F( x. [
  120. var
    8 F4 n! @$ U3 \" @7 V( U
  121.   endpointVolume: IAudioEndpointVolume = nil;5 _( t; q' z) c, d7 B5 O0 j
  122. 3 C' m+ r$ ?; `0 X% U/ E
  123. procedure TForm1.FormCreate(Sender: TObject);$ Q" a& n; W* `5 d
  124. var9 I! J) @! X. ^9 |4 c& W6 q2 l) h2 u
  125.   deviceEnumerator: IMMDeviceEnumerator;( r4 k- D/ }. w& h; k  W
  126.   defaultDevice: IMMDevice;
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  127. begin
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  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);3 d6 ^6 Z' O- N
  131. end;
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  132. # W# K/ u4 ]7 y' h
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var
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  135.   VolumeLevel: Single;7 K& }4 F. Y0 N# y
  136. begin
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  137.   if endpointVolume = nil then Exit;
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  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;3 B* u6 w: ~# m! n8 V6 g( Z
  142. 3 n6 o8 u  \' ?5 n( R- r
  143. /////////////////////////////////////
    % n' ^( K' m* {7 b

  144. 9 c( V9 {6 X9 p" X
  145. // with best regards ToxicDream- ], j: H+ l" d! P1 z, O9 s" C1 M
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