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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% ~2 M) H/ C+ k' G% l9 Q+ y( Q1 V
By Mukta & ToxicDream
  1. : h0 @* J7 I/ L9 d9 B# n
  2. //for delphi 5' ~; H5 ]) K' T6 T
  3. unit MMDevApi_tlb;( U$ g# s& U2 g: ]0 {
  4. 9 Y' U- @' `2 Q" p! Q6 `2 S
  5. interface$ h* a) R- O( I5 ^
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;% A3 A5 B3 t7 E4 Z) i4 l' u
  7. const8 @# _' a$ |4 [
  8.   // TypeLibrary Major and minor versions- K' R, f  o/ T. W+ e: Z
  9. 7 r* k& [0 k% A8 {6 x: D" t
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';6 z) ?& y% Y8 v. v9 B4 x; o' \
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';& Y5 N7 {. b# z1 L; M  Q) R
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    $ v& C4 S: q/ @  r' F' H6 z
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    8 @2 y) _# B: d( C% @% W: X
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    7 ]* a; M& M  M  N7 o# S  t& c
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    2 f" ]. S$ a' ?1 J4 v7 u$ }0 U
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';  V- {$ P% T2 K' w/ T8 y
  17. 7 M' _! C' L3 l9 M2 x% Y- |
  18.   DEVICE_STATE_ACTIVE                   = $00000001;2 V) Z; }. a8 w4 ?0 n
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;) ~; a7 g. O/ E( v4 a) H# c1 R
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;: [& X* Q, C* o1 I! p& g$ J0 I
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    ' s$ E4 x" z' Q6 A# }

  22. " x0 Q: \2 r2 U/ l5 C3 O+ A% B4 |7 p8 U
  23. type( Y# m$ j% Y9 |7 M+ ~7 z5 w
  24.   EDataFlow = TOleEnum;
    3 n6 X+ ]( b# `2 I
  25. const. [3 C4 Q& \6 c% I
  26.   eRender                               = $00000000;% U8 _2 h( {/ O
  27.   eCapture                              = $00000001;
    & K9 G% Q  a: ?; @& |
  28.   eAll                                  = $00000002;( A9 m0 P4 t! T5 N
  29.   EDataFlow_enum_count                  = $00000003;
    . F3 l7 g$ _5 E+ |2 f. X$ N5 r
  30. + I) E- n5 Q# D0 K( O% O
  31. type% x- h& F: k- L; j# A1 c
  32.   ERole = TOleEnum;
    9 i( Z' o" S) k) C) `
  33. const
    8 T7 \: h8 |3 J) ^
  34.   eConsole                              = $00000000;8 N8 [6 O! `# o6 b5 o- J
  35.   eMultimedia                           = $00000001;
    ; n/ M: r5 ^9 M1 {9 E/ d
  36.   eCommunications                       = $00000002;2 s' Y2 o9 @' ]- N# e2 ]
  37.   ERole_enum_count                      = $00000003;* a& Z5 R6 z0 M* C3 Y
  38. , N) Z. g: @3 M4 h4 J1 o
  39. type5 S( Q- V0 K- A% A$ d5 ]
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)" s8 |, f& H0 H0 N: ?
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']/ Y0 X+ m7 J. N2 B3 W% V
  42.   end;
    / g7 r7 \. P) p
  43. % X" h  U% t4 g  x
  44.   IMMAudioEndpointVolume = interface(IUnknown)! M6 p2 _9 q# N6 H  {
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    ; g! Y2 u0 B# ?2 a" ]0 ^* G
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;- O8 t6 e8 H$ W3 y& T" n- L
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;9 H) y. e4 C: ~8 G$ a8 D7 U
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    ! V3 ~1 O% ]  H
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    8 A' X' U% C, F0 W- X
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    , D( Z0 F' y( ?0 F6 n$ z
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;- L  x3 e5 u8 N& {/ ^1 J: _
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    / ?0 K: z) {+ W# ?1 `% ?: w0 j
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;4 \0 E3 A4 e5 A2 Q
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;4 l2 d! L7 G1 ?  ~' a2 C% l) t
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;7 `0 d6 b& Y& a& ?( R5 G
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
    2 V9 v- D6 s4 C6 O2 f3 n
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;9 a3 M# U( i  g3 o: J; t% P. [
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;$ e% j. R0 s& X( Q+ m
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    4 l) }- S, ^" i% s9 S
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;, g- w# @) W4 E; V7 q
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    # H3 X9 e: W, M/ z6 T) u
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    3 }; M) R2 R6 O1 m
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    7 W4 A- A# A' p. D8 b2 y
  64.   end;5 A" I0 q9 G8 s8 K, |
  65. + y) ]" w: I( n$ M& O, m6 O
  66. {  IAudioMeterInformation = interface(IUnknown)
    ) @) J5 [( \7 e. _! I) g) {6 u
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    ; {! u1 E6 ^) T# A6 p
  68.   end;}/ D8 \# M* G/ S- z" }6 B( ~

  69. 6 d0 \( h$ r5 v+ b# a/ e8 I
  70.   IPropertyStore = interface(IUnknown)
      }5 f' C( J, o4 Z3 i0 `+ R( c
  71.   end;
    " F( {+ X7 C3 O6 b" V& u
  72. 3 R) @8 j& U( q
  73. type
    0 z  s2 @( `% n" }/ ^
  74.   IMMDevice = interface(IUnknown)- \' ?4 J2 _1 w. T% ?
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']3 S8 j0 K  B( o7 z+ g
  76.     Function Activate(  refId :TGUID;
    # Y9 i8 u  w4 s0 G2 m  ^: E- j+ M
  77.                         dwClsCtx: DWORD;
    - |9 E# G# P/ M
  78.                         pActivationParams: PInteger ;9 G0 g; ~% K6 a0 V1 z; G5 w4 q
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;( b7 V0 ~  [! J- h, S, v. {
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;' H, S$ x( x8 V2 e
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    4 M! V; Q- X, M$ r. b+ \
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    9 p' @# t* s8 y& L
  83. $ {) G8 B3 @5 J0 p& I& D; M3 D
  84.   end;
    5 |/ f, l+ h$ Z! A9 \1 e2 U

  85. % W! U0 m4 M2 ]. D) C3 _' I" U
  86. ( t6 S9 V0 }5 `* X" k; P
  87.   IMMDeviceCollection = interface(IUnknown)% }: A; ^/ w2 T  s! R0 d* t0 O( S3 T
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ' j) B; P: q1 k
  89.   end;) Z9 d. A' v! v8 H4 E+ x
  90. 4 t# K3 h3 `9 Q
  91.   IMMNotificationClient = interface (IUnknown)6 A  N( L- W( v/ q+ m
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    7 Q5 j. t; p" `
  93.   end;- G+ B, {) f4 s* k; s+ H- j( n; q
  94. % n! f$ I/ h" j. L' q9 o! l! b
  95.   IMMDeviceEnumerator = interface(IUnknown)% j+ P- c( ^$ G4 R# Q) g
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    ' d. a) e% \% Y  {" j7 k( i0 G
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
      M& F/ E6 B$ K. C
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    6 ^# m2 J  p; w, a' U  G. P' N
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    : J0 R) k5 E/ h6 b
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;6 R/ b+ N, e: S) j9 h7 }- I9 J
  101.   end;
    8 M. ^; |6 o/ q& [  v0 m

  102.   p- w3 ?+ d( l  E- u/ l& a
  103.   implementation
    - c3 i2 b1 g: |. c
  104. end.
    ( r3 x; V3 }% V  J, w
  105. 5 m8 `9 ^. w+ i! Y. w3 u
  106. Thanks & Reagrds,
    8 F& E( a4 K: P% d# C; f/ `8 b9 t4 r
  107. Mukta ...
    3 ^# f5 `5 B6 |9 p4 Y
复制代码
  1. ; f/ I+ ]- T, _" a  p! @
  2. it's work in Delphi 7
    : r0 i" T( K0 E# F
  3. //////////////////////////* w7 A5 ]/ h- X
  4. * Y0 L3 \/ M$ V6 F/ C0 a
  5. unit MMDevApi;6 \, l7 g$ Y* M) ]% a- j, F6 q

  6. 8 z$ x  X; d3 v, Z
  7. interface$ e7 h8 e3 h% I! A: W
  8. $ Z) i* D0 C! Z7 q: C* F
  9. uses2 I8 Q8 w4 _( I& w; a9 t
  10.   Windows, ActiveX, ComObj;! b6 a: R/ g' M

  11. ! x' X6 v6 j/ q2 M- N2 H9 {
  12. const
    ) u+ e: z" p# h+ u/ A# l, y
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';0 l6 ]+ [9 H1 A4 ]- M3 }/ X& N% o
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    5 m7 p4 A7 \2 M* |) O6 h
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    ; ]/ V, f- n# J2 g
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';2 n# A# b- o! Q% m% g
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';# p3 D) ^- H+ |
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';7 C; t$ a4 E. d. K- R, w( O: A
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    ' A4 H+ J, {6 C+ T0 }, ^

  20. 2 l2 r$ T: V! H; x7 T" k
  21.   DEVICE_STATE_ACTIVE                   = $00000001;# D* @3 v5 q6 W# }8 {# Z9 F- m* ?
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;3 k0 ?5 }3 A; J
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;, ^! R) n1 e; f( {9 g. C
  24.   DEVICE_STATEMASK_ALL                  = $00000007;$ ^; `9 O7 J, d! i2 B

  25. 5 s" b! T* L# x  _
  26. type
    % v8 [, X/ |8 v5 g* k2 L: c" J
  27.   EDataFlow = TOleEnum;
    - d1 ]0 v4 S% T2 Y

  28. 3 g; s% ?  E9 _& M! m
  29. const$ F; g" n# W! B5 p4 \3 \
  30.   eRender                               = $00000000;; o. F+ O! ^/ J3 P9 c. X% g8 o
  31.   eCapture                              = $00000001;+ w0 p! N2 K2 t7 k: F, F# O' U3 m
  32.   eAll                                  = $00000002;
    # y! ?0 |0 B! q9 O5 U+ D! }* z6 B
  33.   EDataFlow_enum_count                  = $00000003;
    : [* r! b. j/ n8 \3 |3 h1 C

  34. " L9 T' ~7 A9 p, q( B' _
  35. type
    9 B) Y7 p" P! h# I( [0 H! ]% ?
  36.   ERole = TOleEnum;
    - L0 p. k- f3 {. U+ d
  37. ) ]" [7 I. j0 `1 S: g' i
  38. const0 v, H' l/ a  B2 P$ [3 [4 h8 i
  39.   eConsole                              = $00000000;
    2 L! U- ]4 Q- C/ ~* n/ b6 y% h
  40.   eMultimedia                           = $00000001;: h1 {2 J; s; e* U/ h. Z' t* F/ T! \4 w
  41.   eCommunications                       = $00000002;
    " L* F( p5 b0 R4 M0 d( r6 f
  42.   ERole_enum_count                      = $00000003;
    3 n/ T, J' ]4 |
  43. 9 [: ^4 x& h3 [7 I3 ?- @9 `
  44. type
    # r- b) v& m) @/ c) j' d, q
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    7 k: v: ]2 ~  t. t. x5 y
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    ! U: r/ |, [& p4 S! k, q4 M) g
  47.   end;
    - T% j+ b3 c8 X5 L5 ^5 w
  48. 7 e. v. k( m7 R# q1 k7 p% q  [
  49.   IAudioEndpointVolume = interface(IUnknown): d  r( c% G* s; ]  h$ U" e) y% g' t: o
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    , t. w! S2 c6 v; p- D
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    . r7 Q( s0 g% z+ c
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;9 p1 z+ P/ P) C" }# z% Y: q" c
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    & f! ?. `' g# i  ~
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;: L. d& Y& N. n  z7 I
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;4 }! P, ?! t; S# `- t" c9 |
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;; O1 T# H6 [! l3 ~+ H0 d4 D, n
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    5 G  ^% Q# U$ C' B' z; Y# M1 X- h
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ) w' D; K5 m+ h  C0 D! g
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;& Q2 X( r! r# n4 a$ ^" U
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    / F8 M4 |0 |4 U% }% {4 }
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;- n# j  u+ N7 ^! t- I% F
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;# L& R' G9 g! W* G( F, Q) L: f' n' B
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    8 z! Y/ ?$ e7 @, T! I8 C1 }
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    , d0 X0 |# e: l3 l. r( u
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    ; G/ C* I1 ^/ o- a
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    4 g& G4 b8 S5 ^3 I5 w
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;. Q% y( d; _  m1 k
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    8 g3 A* T8 w/ `: X
  69.   end;
    2 m8 M& K4 ?4 X) y6 z

  70. 2 O: H- q8 ^, H1 o1 h' w
  71.   IAudioMeterInformation = interface(IUnknown)6 q  b+ L2 T" j# A. N5 {+ D& \; ?
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}'], o# l, J# d1 w: X. [- J
  73.   end;
    6 Y* d) a; _* B/ W7 i6 ~7 J

  74. 1 B# l4 l$ X# z5 _; `$ {* m
  75.   IPropertyStore = interface(IUnknown)# Q# n5 C2 t( s& M
  76.   end;& g2 K0 ?" [% C/ ?0 r

  77. ' U% w4 h3 G% c0 e% j! f
  78.   IMMDevice = interface(IUnknown)$ I: X( P% r5 M, Y2 S/ g/ T
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']% ^0 L6 h0 g- D1 I- \
  80.     function Activate(const refId: TGUID;4 q: T; R# c) b6 e( R
  81.                       dwClsCtx: DWORD;7 |% L  [# R1 L8 k/ a$ l
  82.                       pActivationParams: PInteger;: R4 \3 {! a$ Y1 X$ ^+ |) e8 T" n
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;0 a% q' ?2 _( i5 _* }
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;) {1 S) i4 |/ a) r
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    4 S4 Z$ {/ D! `5 Y3 v7 F
  86.     function GetState(out State: Integer): Hresult; stdcall;
    2 f$ K  g0 m: t  w- J- s3 [
  87.   end;
    6 {0 [- ?; Y4 u! g* F
  88. $ @+ k; o: B$ ^: R' t  v" u

  89. 9 _6 Y$ i  n/ @2 `6 a% V. ?2 a
  90.   IMMDeviceCollection = interface(IUnknown)( w6 Y) \7 [/ A
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    - ^6 t  F7 B+ _) F( K( R2 J
  92.   end;' A8 y, G. d8 m0 F8 E

  93. * l, _/ G! e0 P7 j; }; D
  94.   IMMNotificationClient = interface(IUnknown)
    ! z6 S, P: r  Z1 P, }1 c
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    ) J3 |( e: O6 A# T
  96.   end;$ N4 H) q6 \  p8 N

  97. 7 u& u7 ?* K: n' E8 T1 ^% [# B
  98.   IMMDeviceEnumerator = interface(IUnknown)9 @2 b7 A/ t) B1 D
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']8 }0 F( h7 g  ]( {3 R
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    ; P3 B/ U1 I, a! O* x' M$ X1 i( g
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    6 O+ l9 M5 u8 |0 u& }
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    . e; S" v. Z! X1 C) M" J, S
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;/ o! v' X$ ?2 k! W6 [; T3 A6 T
  104.   end;7 E- N" r1 r5 l/ l+ R  k7 Z" R  x
  105. % ^  B* _' W' F  u' l8 {/ S
  106. implementation
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  107. # S6 O4 X' x& X- C
  108. end./ {1 J# J! i6 P! e

  109. ) ~5 w8 _0 R1 x& f& ]4 k% Z
  110. ///////////////////////
    9 O- x+ X. S. M& s: Z3 W
  111. simple sample :)
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  112. ///////////////////////
    4 r) k* c) g! o

  113. $ {2 D, z" F6 H
  114. //...... other code$ m9 ?9 `+ b: y* c0 U
  115. 6 |( ]' q7 _) ~0 @0 X) o1 M8 i6 T: {
  116. uses ... ActiveX, MMDevApi, ...;
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  117. : l. B7 C+ a9 r) N4 G6 @1 R
  118. //...... other code1 z6 \# A9 j3 l5 L3 p9 v

  119. " ^1 |6 J% R7 }2 Z4 S- q  I3 `
  120. var& B" O4 k7 G* x2 K' }/ }
  121.   endpointVolume: IAudioEndpointVolume = nil;
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  122. 0 U' X; q- J% H7 c& L& A
  123. procedure TForm1.FormCreate(Sender: TObject);
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  124. var  Z, T; Q$ p& m: f* F% k
  125.   deviceEnumerator: IMMDeviceEnumerator;
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  126.   defaultDevice: IMMDevice;
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  127. begin. n, l! ^" A" k. q' ^
  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);! i; l: o3 e' N3 P+ b( _. g
  131. end;( q+ Z% y; k8 n% |: z
  132. 5 m! y. y9 }( F6 F" _
  133. procedure TForm1.Button1Click(Sender: TObject);4 V; p% M- Z; y) E4 N* a
  134. var
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  135.   VolumeLevel: Single;
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  136. begin" \& e6 y" g  v" E. P( n- E
  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;- T% x( S- V9 o# k4 Q2 C( N- \
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);, \6 z! V- h' d+ P$ e' t; I
  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;
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  142. 0 F& ^. q4 h! H, X% l
  143. /////////////////////////////////////* ]8 }( I% [! g0 K+ V; [
  144. $ X% S& D# T# t2 K2 \2 Z
  145. // with best regards ToxicDream0 k& x$ s% B3 y' v$ d, `1 u
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