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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! n; e& O) S7 B- C% J
By Mukta & ToxicDream

  1. $ f0 _  p3 D' ~( f
  2. //for delphi 5' j: l3 A1 o1 K% C7 Z" l; \
  3. unit MMDevApi_tlb;
    : L- s3 ?* g/ u

  4. & i8 o' D/ Y, O& u# q: o/ w% W
  5. interface
    - O" K3 z5 f2 H4 ]# |, p
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    7 E( e% t- C$ B  B& O- t9 @
  7. const
    * `% K4 r4 t7 x( r: n8 H% ?3 I6 ^
  8.   // TypeLibrary Major and minor versions$ i, o: L! k/ {; c

  9. 6 r: S/ s( r# c: X$ g
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';' l( @, _! U/ g9 I) x3 R: i
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ' G# G5 [2 @9 f8 D. t
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    9 D" ~2 `( u3 P
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ) c1 t( F2 Y: L% K: O/ \- ~
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    " a, I. U+ i9 w6 C2 t
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';+ o; ^+ N) f. l% }' @0 q
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    1 O1 u" l' f% G2 x! O
  17. 6 _" H9 i  E! o) }9 U; m+ o5 o
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    7 w& U! B' j2 `. a# D+ W
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;* Q9 Q; ^) m. L3 h2 d8 N
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    4 c) F" p' k2 e# V. r
  21.   DEVICE_STATEMASK_ALL                  = $00000007;7 ^; W. ], i+ c( ^( j0 ]  _/ H0 h+ F7 H

  22. & l! q9 t/ w+ ?8 x
  23. type
    0 |# z% R( ~3 o: x8 v" ]- G% }  D
  24.   EDataFlow = TOleEnum;
    6 `7 Z; b* e* Q4 W* V
  25. const
    8 m9 T0 Z' ~" u
  26.   eRender                               = $00000000;
    " {& y. B+ ^/ g7 e+ c
  27.   eCapture                              = $00000001;
    - q& @  g8 U( M
  28.   eAll                                  = $00000002;
    1 ~0 L$ n* r% f) D7 G  V: ~" [* O
  29.   EDataFlow_enum_count                  = $00000003;
    6 ~9 y  P  d/ X7 Z1 L& l9 a* b; t
  30. $ K9 H$ T. E- o. `  x' V& @
  31. type
    8 q4 m6 B* G) A2 s( M
  32.   ERole = TOleEnum;# ~4 s9 \4 s* j+ |  H0 W
  33. const3 w0 ~; e9 H- O/ O  k- E. C- V0 i
  34.   eConsole                              = $00000000;
      ~6 k5 V/ ]/ i% l( s9 B4 r) c
  35.   eMultimedia                           = $00000001;9 [7 s" g' O& [+ `! v
  36.   eCommunications                       = $00000002;# }: V# \+ I0 w0 A# i# t
  37.   ERole_enum_count                      = $00000003;9 v# W+ g( Z  F( g' r1 n1 x( L: ]

  38. , w4 z( W4 Z( Y& f
  39. type
    : |' L# A7 S9 o- g  ^; J
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    8 f. y* m; g/ q# g# D5 f, o/ i
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    $ C( C6 l. P4 f9 a, v: d
  42.   end;1 f5 Y7 V( m( t) E( V5 w3 {
  43. * O- D# v- u  Q  q- V
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    0 Y" ?8 ?. |5 I" o
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    & m9 u, w8 N: b8 p
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    8 y5 B+ \) F7 O' s: e" L% p
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;, n1 @' m9 M( n) r
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    / C5 Y1 J* k6 t0 r
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    # k# p& }) m# J' B  v) f
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;- j( G# U. \4 V5 H* K' t
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;4 Z/ ]# l5 I3 K6 V# X( R
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;! ?# R6 y3 S7 V4 q# {
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    0 t7 K( v: E4 D) \  \
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;5 r4 T' ]  o5 K) C
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    7 L) |$ U6 p& f; ^2 z/ ^" Z# ~
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    0 @: l9 ~% [! `3 Y' P& y9 U- q
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    ; A& H7 M  x; h% L  n1 U
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;- `3 a' \/ k! K4 }6 f5 J
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
      ]; ~: q! Q: M" y
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;' H, V! b4 s' w6 B  r
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;4 r1 \/ i4 S% c% S
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    % |+ |" O0 B) Y6 m/ D5 s
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;  L: d0 N$ q- }8 H; U. E
  64.   end;' B) B! z* m9 s* c1 `; ]' K
  65. , V% q, \. g4 {4 g( i, w' r
  66. {  IAudioMeterInformation = interface(IUnknown)( b( ]% ~/ t4 M! r0 T: R
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    1 X7 `. O) T: n" B$ x4 Z
  68.   end;}5 a  F! h: {9 J3 [1 `
  69. ; S  M# H# W: K* I
  70.   IPropertyStore = interface(IUnknown)! ]) g6 s1 j  k% {+ G8 l
  71.   end;' N# F/ ?- e1 I# h5 e
  72. 4 b/ H8 h# c  E" s* ~: k, h% t
  73. type
    / A- ^( V1 O! [$ [$ n
  74.   IMMDevice = interface(IUnknown)
    7 R; L6 ?' W+ s) h% s4 W$ K
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    & @9 R) u# ?! I, M! Y
  76.     Function Activate(  refId :TGUID;
    0 _) Y+ ?2 @* p5 h/ M6 c
  77.                         dwClsCtx: DWORD;% J, L5 T1 G' ]. w: Z- K  g& Q! d
  78.                         pActivationParams: PInteger ;% L8 ^* H$ T8 h$ s& z2 ]6 V  i
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;8 {" p0 R  V+ S$ J' z6 Q
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;( r6 w- x# U4 @% U( r
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    " v1 s0 @6 r4 x; T
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    ' h: S" {2 N3 I

  83. 7 V* e; x9 C, R
  84.   end;
    : j* H; m' F% n# h1 X
  85. 4 i, ]. g, p* r( ]6 T
  86. / z5 p: m# H( _5 _3 H% n
  87.   IMMDeviceCollection = interface(IUnknown)
    ! m! @" g# b- e9 C& g. n3 ]2 z& k: d
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']# R# s2 S. k0 _1 ^" ?
  89.   end;
    , r8 x' N2 F' z+ |- G8 M
  90.   [  P8 T: _7 j9 c0 _& B
  91.   IMMNotificationClient = interface (IUnknown)1 S" ?9 E: }7 J2 c
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    8 u7 R* o! O) k* N3 j" h" j: t/ ]7 x
  93.   end;6 e- t/ l  Y; I1 g8 y
  94. . q* `0 [$ Z0 v' y. ^. O% F+ C
  95.   IMMDeviceEnumerator = interface(IUnknown)( t. E% e0 p5 @1 d2 w0 `& w6 T
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']$ R7 ?9 ?3 {% ?4 |
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;& r0 q0 i  v7 _; `% ~1 k# A5 ]1 k
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    / n2 ]) Z1 _! C4 {
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;2 }( Z1 X2 g8 ]& l! V! G5 ~8 U
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;8 n4 W$ u6 U. \0 r3 J
  101.   end;3 Q0 C7 p5 Y+ f" t

  102. $ x' v3 c8 y7 X: `# A) A
  103.   implementation- U" q8 m( d4 R/ `; B- g
  104. end.
    7 o, A4 _: S  _  v9 v% J0 Z

  105. % f0 B5 X+ |9 k" w" ~; X
  106. Thanks & Reagrds,
    / r' A; \) g3 k  i, ~7 I( g
  107. Mukta ...2 m7 `. S* v3 P9 D8 N  V' K
复制代码
  1. ( Q( |+ N' n" o+ K, ?6 t. Z! I
  2. it's work in Delphi 7
    ( l+ @* d! n& L8 S
  3. //////////////////////////
    ; G" R9 I* @& d6 T4 W

  4. , @' Y. ]5 G; b$ v- c
  5. unit MMDevApi;
    ) U: A5 d+ _* C/ T9 F

  6. ; G! D# ~3 R7 a. l
  7. interface% g5 C4 |- z7 a% b
  8. 6 h# a" K% z8 c) D$ W
  9. uses- G+ B  N* [5 Q: z$ R+ T
  10.   Windows, ActiveX, ComObj;' A+ Q* V5 D2 g7 R" k

  11. ! ]/ V3 G; T* r6 P. m  w
  12. const- I/ f# }5 r% u; q# ^& R
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    % j6 \# y* v" T% j% M5 ~+ }2 \
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    % ^3 k9 u) U- k2 n7 Z
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';" @$ p2 ^( r, G
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    - O7 f! b# p6 }) ?; M0 G
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';; ?( G( G+ R) ?) q' g4 {
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';# U5 ?/ V- e) u/ p+ t) w8 p) u1 w9 _
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';# x# D8 N; \/ G$ K0 ~

  20. / L$ W- h: N( z' I
  21.   DEVICE_STATE_ACTIVE                   = $00000001;$ P- R7 C; d& {5 R2 `. I- U
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    . C+ }- ?$ k% R2 K- J2 `
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;3 V; R1 T" P9 V, r' v
  24.   DEVICE_STATEMASK_ALL                  = $00000007;, x* T' Q7 M2 {9 {; ]. c! J+ u9 t% d

  25. 5 x- L- m: c% Y! p; Q+ U/ J
  26. type
    0 {1 C9 g  n- `! e3 o* ^
  27.   EDataFlow = TOleEnum;+ ?* {# f% x2 B+ |- e, S: A
  28. 8 i* ]- w6 U% }0 E
  29. const
    , M* A) d7 S# M+ J3 `. ^0 V  B  B
  30.   eRender                               = $00000000;# E5 z/ Q( C& G
  31.   eCapture                              = $00000001;
    ; a! V, y5 \( w3 O' _: ~" `
  32.   eAll                                  = $00000002;
    6 b0 K& {+ {: c/ }4 n) D
  33.   EDataFlow_enum_count                  = $00000003;
    5 @4 [  }# ~2 t0 v; ]! D
  34. + O$ B9 [& G* `" }0 P5 ^5 m
  35. type1 K! R* j2 G, ]8 `# f- X3 L$ b, |
  36.   ERole = TOleEnum;
    0 G, K" Z" v  S
  37. ) @; [; ~  l* x6 p0 Y. E) v
  38. const7 `; R" `) r7 U) D& b
  39.   eConsole                              = $00000000;( V' ?) z3 B- F  t  ]
  40.   eMultimedia                           = $00000001;
    $ S6 j, a+ x4 ^
  41.   eCommunications                       = $00000002;) y# y! g8 n! q7 A
  42.   ERole_enum_count                      = $00000003;, N! ^* z3 C+ H& B
  43. / m' i; ]0 ?8 l& v
  44. type/ \2 _5 f+ c" S- y7 Y
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)) {9 h1 k; W5 S5 J4 k( j7 Z8 ?+ O4 t
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']- e9 m/ Y2 _# H) \
  47.   end;
    ) B3 F, G# U, ?' v

  48. + c2 @: f8 q; O+ Z. L% O6 Z* K9 @
  49.   IAudioEndpointVolume = interface(IUnknown)
    5 e, h) ~$ W- e/ w' x3 W
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    1 G" U2 k& H5 X$ n
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;$ ?6 B+ A) j9 q# ?
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;* p: c  V. Y( W3 V) j+ o6 x
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    9 j# S" o% d' e) `* R! a( {4 [: ?
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;& P7 K$ k8 k* K' r% [
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;4 H7 i2 A( }4 ?- L8 A
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    * |2 ]( M1 V6 A3 I
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;$ i1 r) F7 Q( f- t- s
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ! R0 J& u$ f/ |0 ~
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ' @5 l( Y3 M3 g; R# v! P
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;: S, i# {, ]; x# X4 w% f0 b5 |
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;. f( @) }6 C: r1 I" a; j
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;( |7 G1 p7 F  c3 w7 e
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;! r5 w. U4 P( v" o* v) L  ]
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    ) v9 w+ G3 S9 ?' s# Y& c
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;8 }! ?7 K- [) y! b
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;0 Y' c1 }0 H$ a* w( q9 Q
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    , E! ?5 ?0 q+ h# |7 V" \, }( A
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    ! V  U- s: w% B9 ^  X6 F
  69.   end;: }/ J& I# O+ }* o

  70. ; T% x1 Z; G- p# i. K
  71.   IAudioMeterInformation = interface(IUnknown)
    $ K" @& i2 B9 N+ y2 L5 |: J
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']$ e; r) j) S. \( b& z
  73.   end;( U0 y) K, s1 T; W; H; k' m
  74. % m, M5 r! t5 ~% L, w& u9 g8 a
  75.   IPropertyStore = interface(IUnknown)
    $ }8 ?# G, y' p9 M
  76.   end;" R" M: ^( o' Q- R
  77. 9 g5 H) ?( X) H6 O# D% q
  78.   IMMDevice = interface(IUnknown)$ w# [) }, f& f  }9 _+ W/ V
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']+ x- y" u, O/ ]' c8 ]
  80.     function Activate(const refId: TGUID;
    4 r$ q" s( P+ H/ E
  81.                       dwClsCtx: DWORD;
    1 T: k( B; |: c" m; {
  82.                       pActivationParams: PInteger;
    7 q, u1 G; ~! ~' T! E1 ]
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;! |* T2 A7 g4 u5 A* t# r  g7 d
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    " p) x: W0 T2 S0 F" k; e% b! J
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    ( {+ \1 ~, ?- V3 o+ F7 I0 z
  86.     function GetState(out State: Integer): Hresult; stdcall;: \) X4 {! D0 ~) Q* d; {  @
  87.   end;, W% @- q, D% l

  88. . \9 T% _- p0 @  ^

  89. 1 b  [% E1 j  L1 r
  90.   IMMDeviceCollection = interface(IUnknown)/ D/ c) X" Q0 S; B5 ^
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']3 ^! d7 J( \) M8 w& c  c0 B6 ~& |
  92.   end;
    & q& G$ H2 N9 q$ k, ]
  93. : X4 w1 @4 P& f' g2 }
  94.   IMMNotificationClient = interface(IUnknown)3 s5 L6 o+ O- {7 P) Q" K1 x% m
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']% j% i7 Q  l6 \3 E) y+ K
  96.   end;
    $ h2 W. G6 L0 {5 `% _, L

  97. . @/ P- A3 v- R; m4 }; Z: X
  98.   IMMDeviceEnumerator = interface(IUnknown)$ X# P+ r4 h8 G
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']* e( u& ~8 H, I# L4 J! C
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;0 s0 P; W0 O% d! h4 K. _9 E/ i: }
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    # \2 O8 Y3 x. h) r
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    # _' C% O2 I* x5 Q3 @+ Y( z. r
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    0 _/ ?, \' O2 K0 A4 H" A
  104.   end;
    2 N: u1 I( R: U" g/ {
  105. 3 V6 r/ A7 _2 g' \0 {+ T3 q! V$ e
  106. implementation
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  107. , i2 p# ?0 {% k
  108. end.7 L. o' [* K* d. ]

  109. + q! s8 ~+ m) H. @7 {  m- S4 ~* s
  110. ///////////////////////
    * ~# g1 \+ s$ P
  111. simple sample :)
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  112. ///////////////////////
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  113. + m' B+ q; g+ Q: E
  114. //...... other code" f( e5 j4 V' b- D; P3 n1 E0 l

  115. ' X$ A9 K7 n% ^( R3 ~
  116. uses ... ActiveX, MMDevApi, ...;
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  117. 7 d5 g! t4 j. I" V
  118. //...... other code4 S1 J1 u+ {' i4 F7 f" i3 d
  119. 9 F& E% Z/ z2 t) k$ g
  120. var
    ( S/ i/ ^+ B* t
  121.   endpointVolume: IAudioEndpointVolume = nil;5 M# }1 Y/ f' |
  122. # i% Z5 q: F) s. @8 Y! P  X
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var& M* U; a! W1 U$ E* w6 a, E5 F
  125.   deviceEnumerator: IMMDeviceEnumerator;
    : [; S, u/ z6 n* I
  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);5 I, D6 k4 u/ w, w. }9 L; r& K' v
  131. end;
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  132. 0 l# a* `4 w) T7 O
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var
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  135.   VolumeLevel: Single;
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  136. begin0 a& E' k* h* ^$ o1 M5 m
  137.   if endpointVolume = nil then Exit;$ H/ w5 S. [0 A4 l4 h
  138.   VolumeLevel := 0.50;
    5 G; s! S4 ^- p" `7 _( L
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);  z. q: @, X0 y0 V, X, G) _! ~
  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
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  142. * ^* v  X6 G( L4 |
  143. /////////////////////////////////////+ o! T' R# \$ k! x! z- D! v
  144. 5 ~% [" C; f5 T% F6 Q4 u! E
  145. // with best regards ToxicDream/ \' }4 i$ g6 N  X3 m* X! A
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