设为首页收藏本站
切换到宽版

 找回密码
 加入计匠网
搜索
热搜: BIOS ACPI CPU Windows
计匠网论坛»论坛 › Computer › Program Language › [转载]Vista volume control using delphi 5 & 7
返回列表 发新帖
查看: 11731|回复: 0

[转载]Vista volume control using delphi 5 & 7

[复制链接]
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-a8c9-2e27eb9ec0588 M+ O. |0 `7 \& L
By Mukta & ToxicDream
  1. ! G1 l( |$ q1 W4 U0 m
  2. //for delphi 5' O: _% h1 [+ p7 R' ]" {
  3. unit MMDevApi_tlb;
    2 O  |( Z# M; |
  4. / M  s' |9 m+ Q5 ]9 n4 x
  5. interface, j1 k& F0 r; f% a% _
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    % [1 {; `' |4 H+ i+ I
  7. const$ ^  y, U( S+ n  ^: J/ h
  8.   // TypeLibrary Major and minor versions* @' n- d/ m9 ]! v7 y* e# z, V
  9. ' {" g1 F; f# F+ i! u3 A% K
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';" t! q+ {5 A  x7 o/ c; W
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    ! J- D  ^4 U) Q3 d
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
    0 {- l" h& q6 T# _7 A
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    % s. [2 Y3 w6 w; x) n
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    / A( B# O5 i& H/ R/ D" M1 P' L
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    + t# M4 H$ H0 U, H
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';, R7 Y4 N9 |5 V: O

  17. 7 ?1 M7 m1 G, Y& x# b
  18.   DEVICE_STATE_ACTIVE                   = $00000001;# m! _! C, J3 H* N% p
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    3 M. C' i- p- `2 n+ U
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    * _) J/ J- Z7 B; H
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    0 j. k7 q. o0 y5 ^; p

  22. 0 C) n# ~' O) J% N* S% j; |% t/ s" R
  23. type( Z5 E0 \' w0 k, C1 A
  24.   EDataFlow = TOleEnum;" X  ~- p# K9 [
  25. const) U$ ^- ^. G; k5 V; L
  26.   eRender                               = $00000000;& O( j3 V$ W; G
  27.   eCapture                              = $00000001;& l! P& _# t3 X, e7 J# x
  28.   eAll                                  = $00000002;
    9 }- Q/ v- p& S0 D0 L8 y) |
  29.   EDataFlow_enum_count                  = $00000003;
    & \* U! z: X" C: `

  30. & f& V* m4 L8 R: x9 S- r' y1 j
  31. type  y# s) Z) f4 [& L& b: c; \
  32.   ERole = TOleEnum;
    7 _! v6 y' H6 E; Q& T
  33. const
    7 N' _8 v. _7 V6 J& j
  34.   eConsole                              = $00000000;
    ' l! L  y7 A( }  x
  35.   eMultimedia                           = $00000001;
    0 J! X0 F6 b% D
  36.   eCommunications                       = $00000002;" k; y6 y; Y" d2 B- `" R( }" C: ?
  37.   ERole_enum_count                      = $00000003;- j$ p- A1 u' Q) R
  38. / R) {/ I" P7 e$ X7 t' X2 ]( Y
  39. type, u9 y$ ^+ _% Z5 h( q# S6 w- G
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)& [0 C" ^9 i) [# ?- \" P
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']; J* l/ a* f! S  V- \, g! r
  42.   end;
    $ Q+ `$ l: Q2 M& |8 V) L

  43. 2 {$ a( f! g% F- W4 Q4 T  f
  44.   IMMAudioEndpointVolume = interface(IUnknown)* r, m3 f  S, U0 @
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']) r4 L1 F& [; a+ ?# t4 U+ N
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    & f# U' i& ~5 M. ?( ], j! V, l/ @9 h
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    . A& H6 T& Y2 b2 x
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;" L. K, i$ d: ^; I9 T6 q0 K
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    / I8 y9 Q4 M- }# t( W8 c# N
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    + s9 K4 U6 }/ W0 }
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;% t  D* M# f: T& ]
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    5 O& `" e: l: z3 z! D: W' ?
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;$ C0 A# e# L- g
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ; d: {; b* d+ T9 E9 Y
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;+ f+ |* L2 w* P
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;5 y  h, o7 g9 T- `5 ]9 l: M4 K- D
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;6 z3 Z; ]& p! Y; w2 a0 \
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;3 R) a2 Y, ?' D: [5 k; V2 z
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;9 j! S9 q. p/ [: O: u4 l9 ]1 g
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;5 |4 J$ G3 T1 I7 M) i2 X+ N7 M# s
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;# E0 [1 f3 h6 a# d
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    / [( _, t7 i  K8 ^. e) O
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;) z% p( N2 N8 O1 S
  64.   end;9 ?$ C4 M+ T1 v3 ?: D

  65. $ f8 a. K  }; u" b& H1 V& N; `2 y
  66. {  IAudioMeterInformation = interface(IUnknown)1 o  k! c' d7 T! c9 i" F
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    6 @+ K4 \+ s1 e7 ?4 N
  68.   end;}  m; r( s3 d2 {' [. P! o
  69. 5 g7 H8 Q! H$ e( _5 j7 t2 P( ?
  70.   IPropertyStore = interface(IUnknown)
    , W% ^2 O8 g9 t- X; r* W4 K
  71.   end;8 ^, K! F* d3 b" U8 b, C& [
  72. , Z+ g5 S* Y* h/ N1 ~+ z/ S9 |
  73. type
    / J. e) v& k! N$ |
  74.   IMMDevice = interface(IUnknown)# a& V" g& U" G
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']5 g$ `4 P- T. L2 ~0 b
  76.     Function Activate(  refId :TGUID;
    % ]9 G9 C7 N* p" K9 |5 V/ t
  77.                         dwClsCtx: DWORD;; [- R5 `) E- W9 x. `1 G
  78.                         pActivationParams: PInteger ;/ R8 y, p  C3 h$ h* C
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
    1 b  _9 l; e! ^
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    , b: d! \3 s- B. u& ^5 r, P- c
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    3 V/ t) A% N4 a7 ~- F. W
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    + v2 D% H8 e% U( q. u' k

  83. ; e: F7 o5 y5 ^+ Z3 ^
  84.   end;( L" @8 s: c; p% a' ?& a
  85. 2 {. I2 |1 e! A5 F! M. Y) R0 `

  86.   W5 V3 F( D1 g/ [
  87.   IMMDeviceCollection = interface(IUnknown)* j& j% `  }7 v! V. \
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
      X5 w1 ^  R$ p8 Y8 v8 e" G/ a# I, ~
  89.   end;3 E: m* ?. h- ^& m5 r
  90.   I# ]2 A- K& `
  91.   IMMNotificationClient = interface (IUnknown)" V6 x5 A% Q6 S% u0 x, l
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']: r* g+ d, F- {9 M1 u. e* p
  93.   end;5 v' P8 T7 e$ n; g! W
  94. 0 D* z+ `, b0 s4 {$ g3 h. m
  95.   IMMDeviceEnumerator = interface(IUnknown)5 y9 {# f8 Z: g
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}'], P; K  N- _6 a; n5 a2 O
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;* ?  r' w! x6 j5 z9 N) g3 H
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;2 N9 C. ?7 c. ]& R
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    6 j: W* ~* L6 I; |
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    ( V" N4 {) l1 h
  101.   end;
    - A. {# |1 A! T  s) l) B4 }
  102. 2 H9 l* _1 c  \4 r
  103.   implementation. \; x0 `# x7 j+ U* A. F+ y3 }
  104. end.2 [9 w6 w" s- X9 e$ P" e* p) x
  105. ! M" F* E/ ]& P' x) O8 P! o
  106. Thanks & Reagrds,
    0 [. T" ?# C, G. A  h7 Q
  107. Mukta .../ r' C" q2 o' o! u
复制代码
  1. # o+ H; m3 r, E0 d' J, P
  2. it's work in Delphi 7
    ) g) ~' d- J8 s- G- i
  3. //////////////////////////
    + \  ^/ e+ s9 \7 L  X
  4.   {( B1 H( N. t$ c& Z  m
  5. unit MMDevApi;0 O# Y; y7 f0 e1 U
  6. 4 a- y0 V- U3 \) C; h% v1 Q& |
  7. interface
    1 x3 o4 D2 n( H4 S' E+ ]

  8. 6 n0 C$ K( V. h; @8 V
  9. uses
    * F7 r- ]' S! z+ I  i# v8 Z2 I
  10.   Windows, ActiveX, ComObj;
    , r4 N9 p& Z( N- w% ~# P

  11. ; C1 i0 @$ H2 N
  12. const
    ! m* D" w* y4 C8 t
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';* u6 S% c; j# B
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';  W( y* z+ ]3 x' a3 y
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';$ _3 ~4 E' D; L' |' ^/ y
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    ! z7 v7 F. v; D( f; l
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';+ D) y, w. s+ b* E
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    6 [+ |; p+ Z4 W* Q
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    & s5 P! i7 ?$ [+ {; @1 Q5 T0 O

  20. 2 [8 R9 {$ x! m$ @( g
  21.   DEVICE_STATE_ACTIVE                   = $00000001;5 H; h8 t& ~' C; C% T' ]
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;" z( {% ^  t! k0 ]7 ]" W
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ! Q3 q0 B0 e: x8 w8 M! t4 e
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    ( x& g1 E9 A" \, s2 Q7 U2 j

  25. 9 S. u3 Z1 ?1 `
  26. type& ]0 h- _; E/ j, N7 e: C
  27.   EDataFlow = TOleEnum;( t% [! z* M5 S- {  h$ \8 q0 l  F

  28. 3 ]3 `; |' H. _* H8 T' I
  29. const
    . C+ D, `' z3 k" d
  30.   eRender                               = $00000000;
    ! q& N6 n# A6 ^( `1 n5 I4 l4 s' Y! W
  31.   eCapture                              = $00000001;
      L- I- x( P- @1 m5 `
  32.   eAll                                  = $00000002;
    $ d& E$ t# K3 ^2 S' y' ~8 X8 V
  33.   EDataFlow_enum_count                  = $00000003;! v: D5 o6 {0 e

  34. , o9 [0 n8 F" ?/ I0 _
  35. type
    ; b. H7 T. E* W1 ?: V
  36.   ERole = TOleEnum;
    ' s" k5 q7 X) R" U' N4 w- q

  37. * F/ ?0 W' b2 m+ e9 V6 r
  38. const
    + F3 a; x1 s" A
  39.   eConsole                              = $00000000;* K) O* B1 [/ N  y$ [& a
  40.   eMultimedia                           = $00000001;: u3 ]9 Y4 i- \0 z- |
  41.   eCommunications                       = $00000002;0 d7 f2 |8 r- M# K1 s# {
  42.   ERole_enum_count                      = $00000003;
    9 z8 V' S) `# C0 y$ V& S' N) U* U
  43. : F; i! z3 t9 s7 L) C
  44. type- _. o! N- ]! I: j
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    % m3 Z# w7 Q, C1 T2 S0 e
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    * j+ i0 R3 \5 |. c; g( p
  47.   end;
    ( |4 t. U+ ]  {8 Y+ N+ @
  48. ! z7 x. F' ]1 g7 @; K: s1 H
  49.   IAudioEndpointVolume = interface(IUnknown)" h; b7 A1 Z4 i, U/ u; }
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']7 V/ g8 r3 Z2 G& F- t
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ( g: _  m7 T. x5 K
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ' O5 S; l! I8 G
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    7 @5 Y& f; V7 z& M5 f
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    " B" e, C+ ?( y; e
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
      G5 X6 k7 R# W! d
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;: \+ V3 I  I# k
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;# r) A) t2 u$ i4 Y% X$ \
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ; i& L0 u3 p4 O! d% @; b: B
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    . _' h. F& A; R0 t& B
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;' \/ Q' o( C) v- \# f$ p3 }; ~! T
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;% I# o; k4 L$ G) T; U: l4 d2 x. T* T
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;- [! H& `% l# R3 _/ E9 U& w
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;$ v" m4 c" A; d$ i* ]- a* S
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;/ e7 ^% H2 S: V8 b7 m
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    6 Z  l$ |4 i$ V7 A7 C2 }6 o
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    7 L+ |/ L! i- n) n
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;/ K5 r- d; D) W6 v
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    5 ?* \' {/ ]5 r
  69.   end;$ \& c) S) i: g# O  p6 @

  70. " {6 V* {( m+ `% e4 d2 G* Q: ~
  71.   IAudioMeterInformation = interface(IUnknown)0 B+ _- O7 o5 `: F. c2 c/ ?& W
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']1 y9 `$ z, C4 H; k( S
  73.   end;: Y# a5 [8 v' p. o# X  f* R7 d4 c

  74. 2 a9 X, P; ~% o% ]0 x
  75.   IPropertyStore = interface(IUnknown)' {9 V' v- p, Q2 d0 x
  76.   end;
    # I: ~5 O. z; r
  77. ( _# U/ Z. A0 K; ^, y* y) K# Q* _% u
  78.   IMMDevice = interface(IUnknown)
    0 {; U% ~  p# g; g3 _6 v. m3 v
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    # k( w" A; @" t1 _$ A: n$ k
  80.     function Activate(const refId: TGUID;& ~# A  Q7 ]3 l! m" [* w
  81.                       dwClsCtx: DWORD;$ {8 I. M$ W/ r; M# X# r4 V
  82.                       pActivationParams: PInteger;
    7 O1 s: T# a" t  x( C* B' R
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;
    + z0 K: _" N! V' s& {1 _- R6 M
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    7 L% \# B# H; V* L' }
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;! y2 c# R6 P6 V1 Y0 {
  86.     function GetState(out State: Integer): Hresult; stdcall;
    - D1 e0 }; n5 B  j6 l0 Z- a8 w
  87.   end;
    ' T* _* c- x. T0 K" b, W
  88. ' ^+ R% S, i$ ^

  89. 9 a2 u3 E7 x; N* _) w! [
  90.   IMMDeviceCollection = interface(IUnknown)
    , [! c% _' S3 W7 V& b( k" j
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    " N0 U0 X7 x' S
  92.   end;
    3 s7 e9 ^& x4 s3 F) c
  93.   d  f9 N7 n. W; ?3 r1 D" e
  94.   IMMNotificationClient = interface(IUnknown)
    1 ~, w# X( P, T1 U
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    : r9 o% m6 Q) B7 |% W0 H" @
  96.   end;
    4 r# [1 {! E; r8 \2 M% ]( }1 @# j

  97. * {/ H' R0 d  ?* w; a
  98.   IMMDeviceEnumerator = interface(IUnknown): D" m# c# H6 ]5 @) F' g
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    6 j5 M9 T( h0 ~  u
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    2 P! G( h& p7 E, l" P# S
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;! W) F6 Y/ |7 W: ~/ ]! h" x5 v5 J
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;$ q$ W; _, K! L9 b6 g
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;8 _5 x, \" |' t9 S* j1 f% F
  104.   end;+ v, ^# Z$ s! X# G8 I* b

  105. ' o/ V. }1 x5 u& P
  106. implementation6 ?9 `1 n4 _- }3 j
  107. : n$ a5 c1 }' z, c5 o: I' u
  108. end.
    9 h/ y- Z$ z& T6 {# Q3 B6 a, A

  109.   d+ n4 B: S/ ^) y: @6 _) o
  110. ///////////////////////
    1 i1 E- i4 A2 n# Y% P) ~7 n, {' V
  111. simple sample :)
    & t* l& h2 k# x) v& Y
  112. ///////////////////////
    ( h5 {- A' ?( T' b' a
  113. + e7 k# V6 o0 A. k& u
  114. //...... other code
    ! d7 F1 x7 X3 Q: K) o% S  A

  115. ( q1 W9 B3 G$ E# K# r
  116. uses ... ActiveX, MMDevApi, ...;* i8 \$ a$ W3 \& U- @8 J
  117. ) v1 _: @5 h" h# A  X
  118. //...... other code
    % w$ X4 P+ Y9 S) k: v
  119. " m% u! t+ h4 x6 v9 H4 D
  120. var
    * y/ n; ]0 T( B1 ~6 O  F5 s  g
  121.   endpointVolume: IAudioEndpointVolume = nil;: h+ N9 E3 {' I4 q3 o# b! ]0 E

  122. . q  z% J( W$ e" c/ D) V) T) E
  123. procedure TForm1.FormCreate(Sender: TObject);1 v9 ], D8 a2 a* ~
  124. var% x0 |" H/ @# H9 a& ~. h
  125.   deviceEnumerator: IMMDeviceEnumerator;
    % f7 g: Y& H* C) S
  126.   defaultDevice: IMMDevice;( \. Z7 i- Y* L; ~" N  j
  127. begin* S/ r' a' n7 k1 g7 w' M
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);+ b2 ~( o; p+ Q
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);+ X1 S* b( q0 U9 Y1 t) n
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);% C' C& D# G% b# w
  131. end;
    + F- z% l5 C9 N7 F: v

  132. ; c( C- y% l7 ^6 e9 d5 {" t
  133. procedure TForm1.Button1Click(Sender: TObject);9 n. E$ F( C- ~
  134. var
    , n. b. _" J) c% L2 h* w3 I) I, v
  135.   VolumeLevel: Single;
    8 B# D1 [6 V% s  q- g
  136. begin
    % l2 C& K+ U2 @
  137.   if endpointVolume = nil then Exit;
    - t) s) d  H2 D5 \. n+ j  E
  138.   VolumeLevel := 0.50;0 n- Q  @9 r8 v
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);5 ~& r. r6 B1 ^- J  p
  140.   Caption := Format('%1.8f', [VolumeLevel])
    8 R$ O% q: C, F5 o
  141. end;8 E9 K' t4 s! g' E- T. F
  142. * {% M9 R( S+ c8 N9 i. I& V9 r7 p
  143. /////////////////////////////////////) N  E. o* v2 u0 R" T. x4 Z2 ^

  144. , h1 t4 d) X' c0 [! I; d( n* g
  145. // with best regards ToxicDream
    , w- G: Z: u/ _" ^& p4 N" [7 e8 h
复制代码
回复

使用道具 举报

返回列表 发新帖
高级模式
B Color Image Link Quote Code Smilies
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, 2026-2-1 04:15 , Processed in 0.057227 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