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: 11883|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-a8c9-2e27eb9ec0584 ~( R. T4 T' P$ U. B3 {! Y
By Mukta & ToxicDream
  1. - m3 D' ^1 x+ X' D5 ?
  2. //for delphi 5
    ) z! u  g' z! |
  3. unit MMDevApi_tlb;* o& P2 w2 f9 z9 ?; G9 u2 Z

  4. $ [& R: m/ d) U( a
  5. interface+ }+ w0 {; |: w6 q2 B
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    4 H+ E1 \0 \' o1 B
  7. const( \# k0 x+ p; b- |
  8.   // TypeLibrary Major and minor versions; V/ e1 U) f- A6 ?, j
  9. , |( p: b# b  D: p6 a
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';) v7 H- e: h3 m) z# B: p+ V
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    $ n6 R2 T. }3 Q# v
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';
      q2 U9 P4 \' L: w
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';% _1 B  P" \- v
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    , H# b# w; D" w/ K  I+ b
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    # C" r- i9 ~: p( L* E2 `/ |9 k5 u& f
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    $ Y' a& @* D4 D

  17. ; B7 U# g2 |% u# L+ D, V$ k
  18.   DEVICE_STATE_ACTIVE                   = $00000001;' w6 s9 U" l  w5 i# \
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;+ `7 F% S0 k5 K5 Y$ _
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    , Q9 ^" @" R- f6 S
  21.   DEVICE_STATEMASK_ALL                  = $00000007;; g1 F5 p: x% a& H0 ^( f% r; G
  22. ! S/ z, [! F  e4 M4 ?' v
  23. type
    ' [; k5 L2 B, q& F& V" h9 S' k- c
  24.   EDataFlow = TOleEnum;8 U# @: X2 A' Z
  25. const
    " `( {$ y+ N. F* R( I3 K; l
  26.   eRender                               = $00000000;4 L3 f% _( m' P# g
  27.   eCapture                              = $00000001;' ]$ d8 i& X1 d: S5 p! ?1 ?; `# W
  28.   eAll                                  = $00000002;
    ! W" V; Q/ e. r  A# i2 k
  29.   EDataFlow_enum_count                  = $00000003;
    6 X6 v0 N  `' l" p/ ?0 J
  30. 5 d+ `% W5 H" O9 ~# v; P9 q! x8 T: U
  31. type$ s* j% N9 X8 a  X; T+ T5 q0 [3 T
  32.   ERole = TOleEnum;- X, a9 {$ w: S/ `- ?" ~& f( \+ e
  33. const
    ) p: X6 _% N4 \) P) \, K, J- P; G
  34.   eConsole                              = $00000000;. Q6 j; Q/ d) d! k, b
  35.   eMultimedia                           = $00000001;. u. v; I4 m+ U& [9 p
  36.   eCommunications                       = $00000002;
    ) {0 x1 o' P' o) m% o; P' I
  37.   ERole_enum_count                      = $00000003;( x8 n6 f' }( W$ c; W

  38. ) q7 }) S9 c* o3 V3 |
  39. type
      z8 A% |% X0 m! D1 Z/ \
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)- F. C& e9 o  Y9 X3 M
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    " c$ g9 W1 `" R4 Z0 L2 E
  42.   end;
    - @2 m0 p. U1 N, K

  43.   P, V* T5 v! F2 i' U
  44.   IMMAudioEndpointVolume = interface(IUnknown)( [  ?. u& V7 i: \8 d
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    % ?9 }: u1 e4 r+ c; [1 d
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;9 B6 k! o& P/ k8 v
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;! o; i! P3 n" ]+ z4 R. H! _
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    + l% z7 r+ b% x( L4 a
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    8 V5 O# D: K3 _$ ^2 ~9 i
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;& q1 L" T2 h. p$ Y
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    7 R; x8 v0 y: E& X! s: B5 {: o1 T
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;! A; a) e/ f2 a; U$ G3 _
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    ( I. i# K. f( j
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    8 g. W" h; Z$ S9 `) Q
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    " q3 e& l5 ]% s3 G* O
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;, c/ g; D. c; M# E, k
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    1 r. Z% J' l& I7 w7 [% \& u4 h
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    1 K0 l: z4 o; D
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    7 v- W4 |' f- O# h6 b
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
    ; m$ M2 f, P. [( i0 f4 k
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    + e- H0 E/ S% u7 b) n
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    5 d& V+ C: i' D- q3 g. g! T
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;0 ^, W. E- {, |/ E, V# ]* `4 l
  64.   end;* W' G, K, i5 |  r

  65. / h9 D1 I6 b1 {' c! M' Y" E" g( E5 Q
  66. {  IAudioMeterInformation = interface(IUnknown)% M( v' y8 p& B7 k" l* Y3 q  E& g( \/ a
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']" [( m$ J! d5 K0 \' Y* s$ f
  68.   end;}) ~3 W6 k# n+ f: M
  69. : T4 `# h+ D+ a0 Q8 b3 W
  70.   IPropertyStore = interface(IUnknown)
    7 h' p6 p: |* ^4 f. d
  71.   end;7 r) i, v& t8 _# x9 U9 b

  72. / r! w9 T0 E' [+ s# U
  73. type; b1 Z/ X0 Z1 p* W
  74.   IMMDevice = interface(IUnknown)# i  z/ d& [. A
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']0 Y0 U: F. n5 p7 U
  76.     Function Activate(  refId :TGUID;
    5 M  B& _; R7 Q- @# H8 e% A- {3 V
  77.                         dwClsCtx: DWORD;
    ( Q1 Q: j/ C$ b2 J
  78.                         pActivationParams: PInteger ;
    + [3 y$ U5 q! \+ C/ C8 i; y
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;0 ?0 t7 I" @4 ~- B) Z& l
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;( L7 o  \3 J, E6 g
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    . P: v8 _9 p5 Y0 ^# I
  82.     Function GetState(out State :Integer): Hresult; stdcall;1 Z  u* C9 ~$ r; y4 {& S; Y

  83. 4 d" J3 z% y5 W  {) k
  84.   end;
    / E* s" A0 i6 n. F1 A
  85. * O% a$ ?' F( ], Y" J
  86. ' A; j( I5 y6 l4 D& W5 p
  87.   IMMDeviceCollection = interface(IUnknown)
      }; _$ l* M0 J+ l. _+ D, P. I# G
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    / @7 x' P7 X, v
  89.   end;" M: c$ a6 a# w( T2 [

  90. 8 X" h3 T* P! H$ I: b
  91.   IMMNotificationClient = interface (IUnknown)' |# J3 P$ [7 G) a
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']6 F' F% ^* \" m+ R& B( L1 h
  93.   end;
    * i3 C+ j: L. ~7 P2 M; _( H

  94. . w: r1 P( m0 Y( ^0 T; M) S
  95.   IMMDeviceEnumerator = interface(IUnknown)
    : @! d# u2 j/ V; t5 ]8 j  B
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    6 y3 y3 l4 a$ e8 ]/ A: R1 [8 z
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;& I5 Y5 m# e" p2 O) }7 I, x9 t
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    3 Q) E% t& S+ x) w  G( c) r6 s
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;3 H) y8 S9 m" \: h& }) `( \! t
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;8 H8 l" F# b9 p4 ~0 ~
  101.   end;
    ; m# P0 E# w! E! a

  102. - e- p: \/ F! q0 c2 O
  103.   implementation( s& Q$ m! N# J
  104. end.6 G& C  k2 g6 a: Y$ v

  105. $ O) J' b$ o0 O7 ^
  106. Thanks & Reagrds,2 Z! o1 y, w' {$ a
  107. Mukta ...
    % Y7 i+ h/ j/ C, s
复制代码

  1. ' p: @; b, e3 q9 Z+ P7 L
  2. it's work in Delphi 7
    7 a1 \, s6 A$ c9 Q
  3. //////////////////////////, D5 y/ d6 s' h  D0 }7 r9 U0 G

  4. 7 P! v3 ~6 m, |8 T' [) J  @0 Q
  5. unit MMDevApi;
    : [1 M2 z! ]" m) Q; ]4 Q

  6. . Q5 T5 F3 m9 ]1 }
  7. interface
    3 i! `! o6 z# L& h2 L. H! S+ ~
  8. 9 \& n$ u9 e0 L* P2 t0 J
  9. uses
    ; a- \  q' H6 h9 ^
  10.   Windows, ActiveX, ComObj;
    . \3 ~9 F: S( A" n1 l- b# w: R

  11. ( J- m4 k4 c$ Z; D9 _
  12. const
    5 I( }3 `: F( E: r. ?' r
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    # l3 q1 N9 M% s* Q
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    9 [1 P0 y' c/ ?5 i/ G
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    2 H$ w4 I( C3 V" T3 R; U& e
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    & Y, T* b; i  ]# l
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';7 ?3 H6 j6 j6 k! z4 [% _- C. ?
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';1 u. Q" I4 y& \0 c9 d% {
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';0 O& i& ^; B: V( L$ j1 e# i
  20. 0 j6 B: Q. ^( P* q% k4 I
  21.   DEVICE_STATE_ACTIVE                   = $00000001;; h/ a6 f1 Q* l4 `/ U3 _
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    : v& X9 A4 v: X  K( N
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;: S' b) D( ?' p8 [0 ?0 L2 w1 Z
  24.   DEVICE_STATEMASK_ALL                  = $00000007;7 F4 b9 G3 I+ R7 _1 Q$ J8 R
  25. 5 H' C7 u/ x- F! R. i/ R
  26. type
    ( A# w  t! N) L( J
  27.   EDataFlow = TOleEnum;4 D# Y, j1 y' W- I
  28. $ H, z) H/ K- o  m0 L
  29. const
    * u1 H- }* k8 w1 i7 G# v
  30.   eRender                               = $00000000;
    3 q, s7 O+ w1 v  Q8 j6 g- j; \" P8 g
  31.   eCapture                              = $00000001;
    8 Q9 ^- }7 w; P# @
  32.   eAll                                  = $00000002;
    : E# p9 i+ s9 s. F
  33.   EDataFlow_enum_count                  = $00000003;
    1 `  Q& l7 r9 M. S( ?
  34. 7 E+ S& @# c9 C
  35. type+ X  r  G8 `! P; _! O
  36.   ERole = TOleEnum;
    ( M2 f" X% a" B5 N+ B6 X

  37. 8 J; T  a( |$ O% L6 e: T* \. p
  38. const4 `7 c# j+ N+ T0 o2 ]% l; t2 ^
  39.   eConsole                              = $00000000;$ u2 s6 d9 O2 @. d
  40.   eMultimedia                           = $00000001;
      m  Q) B3 K0 l
  41.   eCommunications                       = $00000002;4 `) }5 C+ J8 n& s9 [
  42.   ERole_enum_count                      = $00000003;" y  u+ O6 Q% l

  43. 2 ^4 f7 F0 n0 u' i) G: L' k& L
  44. type* X% q7 h5 i7 M  u8 j2 N
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    . ^$ V3 O+ w& Z8 }9 X* V+ r0 _4 X
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']1 \( }) C5 k" A+ U7 R9 N* c3 g2 d0 a
  47.   end;) z9 i: Z" J5 t) j; j# G

  48. 1 F% Y8 T8 {" K% P
  49.   IAudioEndpointVolume = interface(IUnknown)3 x9 K: H) t0 ~
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']: B: ?) J" z% ~# S) G
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
      C: M" U, j+ h7 H" F: y
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ; X7 D0 F* c5 p+ t2 o- W* U- h
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    ! M4 }# z% l6 k5 H1 ]6 _* G0 A' u
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    * p8 t9 N& n3 _9 W7 G
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
      B) h  e/ \, Z
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    ( L9 v* X$ I4 c: H- y1 i
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;8 g5 N. F1 P6 b$ F/ W6 k
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    9 \1 W9 s: H) ~7 U9 s
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ( T1 A7 k$ P& c8 ]
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;$ f) {6 r) f5 |! M2 T4 }  m
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    3 b) \5 Y: _3 E2 `' D" A5 Z
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    - N- R! ^# h/ E" t8 G
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;2 o7 M9 }* S1 d2 n
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;* H, L( Z( {( K" ]: c
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    % N# J1 R. m( u
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;8 Y* T6 B) l. L0 M9 q
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;( ^. u8 t& R2 L' @5 A9 b8 h
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
    6 ~/ V+ [& n' |) N5 k/ O& K9 a4 Q  ]
  69.   end;
    9 h: H1 P- X+ \9 E- [
  70. ( N4 V9 M# h7 S& m# D1 k
  71.   IAudioMeterInformation = interface(IUnknown)  c8 v" f( a) _7 W) n, l" N: {
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    6 V" s* L' i# i' N) ~
  73.   end;. ~3 i* j- T+ i) e) L2 S5 t" @5 r
  74. 8 r4 o, `' K3 v7 v
  75.   IPropertyStore = interface(IUnknown)4 p) ~* J" ^& w
  76.   end;/ k( J; P4 h, @" b, ^& M, T: n
  77. - q9 u5 S9 e$ W2 s$ e+ n6 w
  78.   IMMDevice = interface(IUnknown)
    , i+ R, [0 U/ o4 m5 R( m8 M" G- k- J8 ~8 D
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    ( z& p& q' K* q) c, E4 k( B0 M
  80.     function Activate(const refId: TGUID;8 x) k" s7 R, Y2 a1 {/ n6 `5 e# {
  81.                       dwClsCtx: DWORD;' q4 L$ @) R1 _% P# f' z' k* Z
  82.                       pActivationParams: PInteger;! O9 a. n" S* O. r" i# L
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;* ]* Q& i1 O' z, z9 Q+ Q! ?
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    - U. ^. v2 i% p5 h
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;. l7 C! N6 Z: ]! T1 m' Q# @
  86.     function GetState(out State: Integer): Hresult; stdcall;! `' A# e/ w3 ]' p8 ^1 v- d+ j
  87.   end;
    8 o4 T- T3 J) ~

  88. 5 q, d+ t; W+ a+ F' S, _3 Y, G
  89. $ |: W0 V' C: p) Y, f( n
  90.   IMMDeviceCollection = interface(IUnknown). o5 s9 r& `% A6 ]. S
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    ( @3 b; {! a. S6 x' u9 v
  92.   end;
    ; y/ x: m' E( @7 I) p" ^5 g& n

  93. 8 o  V1 W: |- ?5 N
  94.   IMMNotificationClient = interface(IUnknown)3 [0 T/ k8 [  j) y" d! M
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    / K" |$ j: I! H5 c# X
  96.   end;+ J/ T. Q' j- f, C: ^2 P+ o, Z2 w
  97. 0 s( }9 N4 w# @8 ~. V
  98.   IMMDeviceEnumerator = interface(IUnknown)
    3 w( `" D& ~1 ~0 |
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    ' O$ R& k) Y; E; R
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;5 z, Y  R- n% t5 d
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;
    0 ~/ u. N" n! l1 h. n
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    1 a2 e; |4 P: a8 n
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    % N" N% h3 l8 T* Z. i9 C4 S
  104.   end;2 K$ A; s# b# c: f

  105.   r+ B, J; P2 @
  106. implementation1 o) T, t- v4 s

  107. . \- ^3 o) B3 D
  108. end.0 M1 y7 |% Y  Z* G. [! l

  109. / j7 ?1 B% j* I6 g* @7 g# Q. U: X
  110. ///////////////////////# D& P. j  T& R& \! x) c
  111. simple sample :)
    ( ~9 `" j$ t2 c6 C
  112. ///////////////////////9 a! v& g: [% h% n/ I  c

  113. % V# \+ o+ _) Y: S
  114. //...... other code
    7 t8 O' D0 z1 K- G
  115.   O: a. H' U, r6 J. S; C1 h
  116. uses ... ActiveX, MMDevApi, ...;
    0 t- Q, M5 ?  g
  117. 7 \( a) Q( E. [( ?6 }( |
  118. //...... other code
    ! [$ H+ k8 C5 d1 J( T

  119. $ P3 B5 Q& ^  O6 d: M; N+ [" J
  120. var5 q8 J8 `$ |4 D5 ]  }" e  r. j" X  ]
  121.   endpointVolume: IAudioEndpointVolume = nil;
    ; r( W, [) V5 k) X) t( Z
  122. # Z2 f" V4 N! K8 `7 r
  123. procedure TForm1.FormCreate(Sender: TObject);
    6 q/ q& _+ |* H1 ]9 u% M8 N
  124. var: K* |& W' Z% ~7 @, z/ l
  125.   deviceEnumerator: IMMDeviceEnumerator;
    . j! E! I* s2 V& w% i8 |( U
  126.   defaultDevice: IMMDevice;
    3 g7 Z3 p' {5 N: `, V2 j2 z  I  ]
  127. begin
      r4 `* z' x0 b! I
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
    : ]3 ]6 P8 v5 V* t. A! ^: `: J( [! t
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);9 `# ]# u6 j& v7 E  e: @* j$ h/ b
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);/ e  m/ p: Q/ x: f: V
  131. end;$ ?; W% \+ f( r; o. A4 M/ w: ^! f# q* C

  132. " t1 h& [  B# E* r  S$ n
  133. procedure TForm1.Button1Click(Sender: TObject);
    7 U& O& V/ N0 i! X% G$ c7 h
  134. var; ~- g0 H4 j; b* p7 n
  135.   VolumeLevel: Single;1 W! Z+ ^, o4 _, m% v( _9 F
  136. begin
    3 S5 O/ j! J  N- B0 P: y
  137.   if endpointVolume = nil then Exit;
    ' G0 [+ D, B* M9 r/ Z
  138.   VolumeLevel := 0.50;
    6 c2 h( j6 x; D0 [" m, Z. B
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);8 s7 n6 b. |# \6 a
  140.   Caption := Format('%1.8f', [VolumeLevel])
    ; W. W/ u8 Y- v; f4 t* J
  141. end;
    . b, n" a3 y) K* e) L( N, d

  142. ! E& w3 \1 I: O% Y0 E
  143. /////////////////////////////////////
    0 z0 O9 v, J* |3 {1 m

  144. . c* w+ [& h/ _1 [9 X1 h
  145. // with best regards ToxicDream: f" x8 E! u$ q4 U. j2 i
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, 2026-4-4 18:27 , Processed in 0.252053 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