找回密码
 加入计匠网
搜索
热搜: BIOS ACPI CPU Windows
查看: 11840|回复: 0

[转载]Vista volume control using delphi 5 & 7

[复制链接]
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
  h* p8 j3 q; wBy Mukta & ToxicDream

  1. 7 _1 G2 T4 v( m: e: y$ |+ V
  2. //for delphi 5
    + R: n1 h8 ~! T) o. @/ j
  3. unit MMDevApi_tlb;
    . U0 s7 U, Y9 u+ T

  4. 4 T- ]& z2 F5 G+ f. H
  5. interface: `9 o' ?1 w, I1 B# q+ z* C
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    - m( E" D: s6 O; ?
  7. const
    7 d  T0 w" C; \" N: Z8 P. V
  8.   // TypeLibrary Major and minor versions
    9 d$ k; H- L1 s2 P1 h9 R5 t  f
  9. 8 H% T0 u; w! z# M- d% i; q. S
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';% c' k9 {  Y/ ?3 s" L7 h
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ; b5 y; P. S; p. d  O: X4 y7 `
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';: ]9 }1 F  K. f) \; S$ |/ l" G3 j2 g7 d6 V
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';+ \- Y7 ~" P0 \) ]4 F" W5 A% r
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    2 P$ _4 m, i6 h) s, }
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';. U( Z/ ]; i5 V  H
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    * m( l% ^# n8 ]' j$ _

  17. 0 k- K+ g5 {2 U
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    " c- |6 c; H9 I* H, {/ m! k
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;" S1 o) @4 m& J1 y" F3 X, a( u
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    , j3 c, X. j# [( @! b  F8 [
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    - k5 V6 B. u* P" x' c2 H

  22. 2 l% W9 w0 [5 i+ z- v8 t9 V
  23. type2 w& g0 ]6 k( A" {4 J
  24.   EDataFlow = TOleEnum;
    5 ^- U' M, G, g$ b
  25. const& Z3 p# _: u6 g3 l0 F
  26.   eRender                               = $00000000;. O' b+ y, \; k( ?) K
  27.   eCapture                              = $00000001;
    : C5 ^- u; B" ~7 Q! n" I+ W
  28.   eAll                                  = $00000002;
    4 Y/ W' H1 K- X- C
  29.   EDataFlow_enum_count                  = $00000003;! R, f3 e0 w1 H

  30. ) q0 z1 v7 ?7 F+ ^, ?( o
  31. type* J6 s) J3 U' d; J- Y
  32.   ERole = TOleEnum;
    1 R: N5 m. Q/ x! u9 ^8 |
  33. const
    4 i+ Y: t/ D; C3 e
  34.   eConsole                              = $00000000;
    3 Z- ~! s! X: ]- |6 S
  35.   eMultimedia                           = $00000001;# V; b6 G! M" c& Y- R
  36.   eCommunications                       = $00000002;
    * ]4 k- @6 v3 {* C7 @; G9 P6 j
  37.   ERole_enum_count                      = $00000003;8 m" F+ Y; i0 J& {! c

  38. / Y" ?+ n3 d0 n# R
  39. type
    6 R. C& W6 L( M" X1 c; D
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    ! a0 v! R! G  ]: D$ e0 U) A
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    * r2 D3 f/ X, m" O7 @0 |7 \4 Z
  42.   end;
    - ^7 w# Y* c5 R4 s( D

  43. : e3 b# w& b- X$ z' {5 I& Z& P+ s
  44.   IMMAudioEndpointVolume = interface(IUnknown)) U3 W) i% v$ m( q1 }8 i' ]
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    8 a. l1 M8 \1 h' k0 Q& E8 s
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ' r7 b3 }* [! g: {
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    , u) n9 _# [  r. `
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;6 W5 G9 o5 n* n% @2 D; w. p/ w
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;! Z1 E( a0 N5 t' G& }
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;2 |( `9 d' r! \, x# D: ?- y  ~
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;" o, N8 V( I' ?
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    . `& Z  S6 \* D* Z) B$ ^. x/ m! A! H
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    . U% K9 Q/ @' i9 l  l+ w% j5 n
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;9 w7 y3 U: L$ Z# L+ k
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    5 i! F8 Q! x/ _9 a
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;7 I+ @6 r( r& z- R! e
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;* z7 r* H4 k3 P+ Y) N/ q; o
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;' f1 K% T) f+ K$ b1 o( G% p# f! \
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;! r0 h! J  a/ _
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    : B# n+ u2 P4 j' F
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;- i0 b  E) a" _! ~
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    ! D' m" x6 h( A- D
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;% W0 S9 x4 _2 Y  B9 E/ b
  64.   end;
    - s' o- ?4 G3 ?# Y

  65. ( g$ V5 O# h+ B+ g
  66. {  IAudioMeterInformation = interface(IUnknown)" X( z% a0 O7 X6 z; W1 k" l
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
      R+ A$ R, w+ g( I; R) P  @; k* z" Y
  68.   end;}
    # a/ u# U- K  G
  69. 8 G: u; Y8 d$ n
  70.   IPropertyStore = interface(IUnknown)" [8 E# C8 O9 f3 Z9 U
  71.   end;
    * o, \+ n$ X  b# v$ j0 k: }9 i7 I; [
  72. . a0 `1 ~7 F$ O) |
  73. type
    9 o' x5 f0 c+ c- x8 `- Q% V
  74.   IMMDevice = interface(IUnknown)' v$ }: ^+ P1 Z+ o% g
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']1 B/ D/ i- y- Z& ?
  76.     Function Activate(  refId :TGUID;
    ! k, o4 k! t# S% d2 q
  77.                         dwClsCtx: DWORD;* g) z1 M8 O: w6 k; h+ p
  78.                         pActivationParams: PInteger ;
    ' l: p7 a  o9 m+ z5 E
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;3 X( R- e% e* J' b, ^8 |# K& f
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;# u7 P* a  w+ U3 b! b9 Q  Z4 S
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    ) }4 f/ i  E0 H) p# P5 z6 |- o6 B- R
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    * m3 H7 a6 O! k. H
  83.   o: q7 h1 c4 F/ q
  84.   end;1 m/ ], W  c. v

  85. : C. z/ q8 O% m9 w* l1 t
  86. . ]4 `6 j" X* K* ?7 q
  87.   IMMDeviceCollection = interface(IUnknown)
    ( O1 T; \& f  |3 P! z
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']7 m# \( g6 a4 C" D( x9 C5 {+ s! O# z
  89.   end;
    : ~/ J* a2 n+ ]$ Z. {

  90. 5 A! x3 t1 Y" a8 M) D
  91.   IMMNotificationClient = interface (IUnknown)
    : c0 Z8 _, ^& {& c2 i+ s5 G  K
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    * j/ A& g: E+ k  E: I( M) d
  93.   end;
    7 Y. Q% O% N, o0 J4 L. c

  94. ; r* \7 s: H! W$ f+ P% _  _9 U
  95.   IMMDeviceEnumerator = interface(IUnknown)
    / z5 i5 K! g& D
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    : n# l' p" S/ e$ E
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;3 S% g5 ]* y/ U2 {% o/ C% u
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;. o  |; Z  ?/ U4 S& x9 e5 k9 {
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;( P7 b# l( e, E" B' I
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;, W: n% B0 l6 F) n# W4 D& s- E, A
  101.   end;
    ; K. N- A9 s# o6 r% g
  102. " j1 E, X0 U4 Z( B; L% y/ B5 K
  103.   implementation; l: L. {0 U! p2 i) \
  104. end.- q( y, ~: R' s' W2 W; l! _0 h

  105. , G) N( o, l. s( J6 ^
  106. Thanks & Reagrds,  m5 K' F6 W, I
  107. Mukta ...
    ! X- ?. z9 k, Z7 f
复制代码

  1. * D; _; X1 p) \& r  G" h# L
  2. it's work in Delphi 7
    - M( R/ ]  E4 e) \6 |
  3. //////////////////////////
    5 D5 ~7 N+ N8 S1 _
  4. 3 v1 e. u# ?, ]: ^4 s" A' {1 D
  5. unit MMDevApi;
    - G/ g5 [7 \& ]6 \

  6. $ R( t4 U& {. f: h5 ?# K
  7. interface
    * H0 A2 B2 b9 L7 F1 Q

  8. 8 P5 K% o' L9 M4 ^) k( n
  9. uses
    3 w9 n0 D, `4 _$ P/ ^
  10.   Windows, ActiveX, ComObj;
    * e$ d/ h  |6 `3 z

  11. 1 a- Q& _$ p1 b  m" I, r/ c& N
  12. const' z8 d/ ^+ m( P
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';( P, f( ^' ^, d3 V+ a
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';& ?. g5 ~* o$ j- ~& U
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';* M' q2 T( v6 I6 v
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ) U" l# g+ l8 u1 _
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';# X/ e" M9 Y3 {3 B0 n/ \
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    6 I. ^+ ^& ]% D7 T& s5 {% ]6 s
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    + N! L  O3 n% p& Q$ k4 y! B

  20. 5 R$ k1 @% z( @  T7 e$ F8 y
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    . x/ d, \  t% P8 z
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;7 S$ o2 ?/ R  k7 F& U# F% K
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    # K- U; L6 C& t, x. C7 D( L4 k
  24.   DEVICE_STATEMASK_ALL                  = $00000007;  G! i3 i6 \0 l0 J/ L% r$ {

  25. 0 l7 C/ h. a" a' @0 }; o
  26. type+ y2 `% v* K6 x8 x5 g
  27.   EDataFlow = TOleEnum;* `9 t+ c# S* r) s

  28. 4 x3 v. A8 Q4 m
  29. const
    , p+ G5 Y. N4 [- d8 ?7 }9 e
  30.   eRender                               = $00000000;
    . d7 v/ E) `6 D/ j
  31.   eCapture                              = $00000001;9 {" d1 W* P- O% Z5 v0 V3 ^- b
  32.   eAll                                  = $00000002;7 _- [3 l% [2 }0 q
  33.   EDataFlow_enum_count                  = $00000003;8 e3 i- t& L. J6 q+ n( g

  34. + C: ^* Z" h2 [" b( ?
  35. type
    , j  j/ \; B( n9 s- J9 c* ^
  36.   ERole = TOleEnum;
    0 ^1 q$ O$ T- i7 f- j
  37. 4 a, u+ I% T! A" @  \2 K
  38. const
    # E' r& v+ n8 D5 Y" d
  39.   eConsole                              = $00000000;
    + A6 n  X! j# {- z
  40.   eMultimedia                           = $00000001;% T! E5 r' W. a- j8 H
  41.   eCommunications                       = $00000002;
    5 J7 ~; _3 `; I% T4 m
  42.   ERole_enum_count                      = $00000003;
    $ f2 E4 X4 d0 a1 i

  43. ( R5 ?4 q: u0 X$ A" t
  44. type! b& r6 Y$ m5 ~3 Z8 L' I) P# }
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    % U8 r$ b( M6 o& r( Z3 k
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']2 R( C& z2 q/ C3 Q8 r2 E
  47.   end;! i) u& C6 ?% q+ H' C9 I! @6 r* D
  48. 5 Y1 k- [" B4 w% Q
  49.   IAudioEndpointVolume = interface(IUnknown)" a' S) T- k7 w2 [4 `
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    , k! |& V7 ~' B1 O4 y: i# J
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;8 O& T$ B: v7 ?! K8 Q3 X: P
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;9 b, z7 g1 K9 t1 j  y
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    - U  H1 G' H: ^& x- d' T7 e) ?
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    3 E: S! G( @6 _4 c0 E- {8 m
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    , H; h+ W* w8 c1 g- a( C5 ~
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    ) t: A/ o% G% b  g; o/ T
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;$ M1 t; R. N! z( g$ p+ F
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ' h# a9 I6 U3 y3 u( @
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ) H) g  d2 k2 J5 v9 d1 _
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;! H) |- e9 u* t5 o1 A3 d
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;: ^9 }, n& t! i; O8 G
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    " ^" j' j3 J% q$ D. M0 n2 b* i+ v2 ~* T
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    ) J, a# F1 ?! L: @3 B8 y
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    * F! E- |! Y* e' H# P* Q5 j8 m1 k7 O
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    8 C" U% p" Z4 I0 B5 z* i( m
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;7 \6 P& _. l. G# D& {. B, u
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;  i: M) g  R# ]; A
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;, a" i2 o' L" \  `# Q* C6 Z  c
  69.   end;- E0 p7 {- K- `* A( K

  70. : Y8 k2 p6 ~5 }- W( v# I
  71.   IAudioMeterInformation = interface(IUnknown)
    ; @8 Q( ?/ B6 P' C  w) }% R
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']& D  ~* L1 z/ w8 E
  73.   end;
    ; I& \! B+ K0 `( g2 V6 w

  74. & U# F% Y3 \2 i) g; g
  75.   IPropertyStore = interface(IUnknown): Y9 U3 }2 f0 h! v9 S' F
  76.   end;9 h: i9 X; L% e8 {* M% p

  77. + P  D/ G6 `6 u3 M' v6 Y; P
  78.   IMMDevice = interface(IUnknown)
    % n, i- D2 X' q; J1 K) N9 O3 @$ o
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']8 v3 m0 p( n) y: i
  80.     function Activate(const refId: TGUID;
    . ~( q) Y# Z1 H. a% G
  81.                       dwClsCtx: DWORD;$ g1 L/ z8 }0 f  o/ ?. X5 U
  82.                       pActivationParams: PInteger;
    ) g: \* V6 S+ c- ^+ c5 R* S
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    9 a& h- P6 K$ V( o2 X
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    & j  n! r( I* H! u
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    # Z$ ]- ^, p1 i9 g* U# {# o
  86.     function GetState(out State: Integer): Hresult; stdcall;5 z& t5 u+ M1 b+ l) W% ?* y
  87.   end;$ i+ ~5 k! Z4 v% e5 f; X( Y: U2 C
  88. 8 e8 V1 S0 f; [/ e# {) D: q
  89. # H: y( j; t" P4 `6 c* B
  90.   IMMDeviceCollection = interface(IUnknown)
    $ ^. e/ A4 _8 b8 a, {% t
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']9 u3 ^% |# j$ X# `& W  n
  92.   end;% H" z7 E1 @1 Y6 f/ \
  93. 9 P: }6 ]# G  e& i
  94.   IMMNotificationClient = interface(IUnknown)
    4 g4 T. u  b8 u6 L. T
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    5 O$ H$ {) L/ m/ U6 \2 Q7 U3 n
  96.   end;1 H# W& N) n! h4 H: M: a! c. r

  97. - d; x. J7 b4 E  q# ^
  98.   IMMDeviceEnumerator = interface(IUnknown)& s0 G3 o$ {4 [! x
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    7 s& {4 c' f( F2 n8 g
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;) S1 c, D8 ?6 e4 M" `" n
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    ; z+ f. F1 {) k' `  @  d
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    : `  T, W2 J+ e0 _9 p
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    . O! i* {* @" {0 U& i9 V
  104.   end;  n+ t! s8 {7 E! z9 }% [7 \: g5 T/ \
  105. & @$ q3 m% P. x4 s9 `
  106. implementation+ H7 B% b8 T' ^
  107.   G, o8 y3 i( D! y/ U8 C
  108. end.
    6 Y$ E/ t: W) \* c- Q
  109. 6 L$ F7 W. q- ?/ R
  110. ///////////////////////
    0 i7 J6 D! X1 e/ C1 ^; D( G6 g
  111. simple sample :)
    * I7 j( B( F  @" h+ h
  112. ///////////////////////
    0 u; c/ ]% a# R7 d% T$ Z, g
  113. ) B) g% l. U, r0 ?7 l8 d6 `1 a
  114. //...... other code
    ( q, }$ f5 D# F  _5 J

  115. ! d0 n( v: i+ X+ R& _9 Q: W
  116. uses ... ActiveX, MMDevApi, ...;
    + m, d/ S5 F) p; \% G* M" T: I- O8 p
  117. ) e# J; o4 G: \! N. T( g
  118. //...... other code
    $ R; `/ r: W* C8 I- `( A
  119. 1 u) ~1 y; T9 i. D, G
  120. var
    9 h4 r: F9 n" I% h% ^0 R; R* [
  121.   endpointVolume: IAudioEndpointVolume = nil;2 B: T" ^8 y+ Z% O, }0 V+ U
  122. % ~' q+ G8 S8 P; Z8 ~8 ?- r" h
  123. procedure TForm1.FormCreate(Sender: TObject);
    3 w) l# r# W9 U7 c4 O0 d* R9 `
  124. var
    2 Q" O$ }9 E) i6 f% W
  125.   deviceEnumerator: IMMDeviceEnumerator;# B! Y7 d/ ]# ?  S" ~& M  U+ v
  126.   defaultDevice: IMMDevice;; f% G7 d3 n' X. k( s$ H
  127. begin
    " D6 j6 L/ b  [, X* |1 b7 d# p; Q6 N. ~
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);: r# x; p" `% }
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
    1 d& N( k' }0 q. S0 |
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
    - B) Q9 S$ X( J# X1 J, A; H
  131. end;) i- Q' n1 e! H4 `- f' ]5 L

  132. * m$ d5 z5 K) B7 ~7 x
  133. procedure TForm1.Button1Click(Sender: TObject);
    $ o! a- Q( U: ~/ h  q
  134. var
    * J: n9 s* ?! N+ ~" ]1 Y( N5 J+ }2 ~$ E
  135.   VolumeLevel: Single;
    3 y  u* e* y5 }. S- w& L
  136. begin
    * x: X8 {+ H; ^. @
  137.   if endpointVolume = nil then Exit;3 T) K) ]2 b) R/ f% W0 w
  138.   VolumeLevel := 0.50;
    " }0 a1 W. ^- r; H
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    6 S- b/ Y- j- w" g
  140.   Caption := Format('%1.8f', [VolumeLevel]): x' V! }) r/ i5 @
  141. end;
    0 M" b: `9 P6 b4 C

  142. 2 E+ D# [. l2 u7 f) k9 g
  143. /////////////////////////////////////' o2 t# g1 C" `" ]% ^6 k2 _
  144. " h. }) g2 @3 m; U- A* g
  145. // with best regards ToxicDream. V5 P  |* |, l' j8 C1 \
复制代码
您需要登录后才可以回帖 登录 | 加入计匠网

本版积分规则

Archiver|手机版|小黑屋|计匠网

GMT+8, 2026-3-5 14:25 , Processed in 0.084093 second(s), 17 queries .

Powered by Discuz! X3.5

© 2001-2025 Discuz! Team.

快速回复 返回顶部 返回列表