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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
$ R& Y2 X" T  N5 zBy Mukta & ToxicDream

  1. ) {& h  V1 t% M" w5 s
  2. //for delphi 53 z0 l$ `$ v0 P* l5 {7 ~
  3. unit MMDevApi_tlb;
    1 I( d: L) H  L2 |) b6 ]6 ?1 ~4 F

  4. ' u( x' s/ M5 r2 H8 a
  5. interface2 w- ^) {# B0 g- _# L
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;8 u8 P* \( f5 m4 O) R  A( V
  7. const5 t1 u" o6 Q) K
  8.   // TypeLibrary Major and minor versions# Z- h* g0 p# y( j# C% E4 ?* N

  9. . G& E6 U/ ~# a5 j% |* l- O' N
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';; Y/ c; p& o! X$ D- t8 D' Z2 Q- i
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';9 p9 `4 Y8 A4 J3 ~0 u0 |6 D
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';& u) t! W2 n+ A2 \
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    8 T4 Z# E" a% p1 Y/ X- L& e3 ], |
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    , J- z8 U( J+ E4 f& S+ m$ D
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    0 l. a# A/ U9 w' d
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';0 k) x( f  I( A- s

  17. - ~# v; _4 d! {; ^( m
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    ) Y/ }0 i2 W( j4 d0 ~! G  ~$ w
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;( a" ]) }; E/ o1 ^, }
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    - g2 \) E2 ~# \* J
  21.   DEVICE_STATEMASK_ALL                  = $00000007;+ k% `' H7 r8 @" e) [0 N
  22. ! q; y1 @. e4 V" u& M( G( Z  l; \5 a
  23. type
    # g* s/ k  q1 e' Z" G9 Q! P
  24.   EDataFlow = TOleEnum;, g4 l& y& ]% S: [: \6 i
  25. const
    2 j" r7 w6 ?4 M/ K# ~9 o
  26.   eRender                               = $00000000;' d  k& e- N2 O8 s; e# n
  27.   eCapture                              = $00000001;
    % r# |6 s+ ~: X* T* [
  28.   eAll                                  = $00000002;
    & T4 C8 r1 r. ^  [
  29.   EDataFlow_enum_count                  = $00000003;* x* K/ m- Q# a+ z! c3 ]' a
  30. ; J9 M& d9 U0 U
  31. type  }7 f  U$ X  [1 L! E
  32.   ERole = TOleEnum;$ Y! s: O/ B' ^# h# p1 {
  33. const) n* J0 J1 a  y, x2 a2 t
  34.   eConsole                              = $00000000;
    : v, o' [9 ]  Q: |9 M5 A
  35.   eMultimedia                           = $00000001;
    0 F5 ?$ E1 v7 V1 e
  36.   eCommunications                       = $00000002;
    3 N& j; r5 C; S/ q
  37.   ERole_enum_count                      = $00000003;, E0 v( U' w4 t: c- r' B: u- J# h

  38. - s! x2 a' G: `0 Y
  39. type
    2 J# O3 S/ l1 y
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)- W* T4 r# @0 H, P  r8 P
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    # S% X3 D- O5 u) @8 C
  42.   end;
    & }6 V) i- `: f* r1 {! H8 ~

  43. 5 a9 C3 B, u1 G( J" ~/ z
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    $ C3 i; B, H$ F' }. |
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']3 k& o1 t4 f+ ^7 ]
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    : r( U. t/ }4 ~' L# k
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    ; Z+ k1 G8 x  c8 W* V9 w! X  w
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;5 X5 N1 Z/ f4 ~
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    / _3 ]: ]. t' I$ @* q# S7 a' w
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;) C) x( d, m. M  ?/ X- \3 T- O, J: R
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;) p/ u9 g+ g! q; a" {: o
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;) X2 O6 `! A) \2 A
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;* g$ }8 \" ^- ~; {
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;, f8 S' q, w& I9 ~+ }
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;6 Z/ }" l' V& g9 O/ o! R) I
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;* `. S7 n# S; \) ]7 t4 P, k
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;0 }% B/ B, ]: W% O+ I( c0 M' L
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;, q3 k# o2 y  s
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;7 s2 C6 O4 I1 C6 N1 I
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;# u( J3 T, ~: l
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    : k. m' j& g; G/ B$ L, {
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    - C7 }% h. l& i9 Z" t1 j. o6 c
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;: a" J( K$ i, Z3 U3 d2 w) C; R( U& i& B3 h
  64.   end;; @3 e( }) _/ b( x7 Z

  65. # j  C2 W6 Y5 s  A/ v
  66. {  IAudioMeterInformation = interface(IUnknown)+ d0 Q1 H4 L* b5 g( ]. F
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    # a5 k) m/ X" Y1 A- B( s/ u
  68.   end;}
    * i% X9 P1 U5 G2 c

  69. % k( @9 y0 z. M- {4 K' f: P# D/ @
  70.   IPropertyStore = interface(IUnknown)+ k! [' Q% ~+ @. ]9 `
  71.   end;
    9 E6 n7 n1 ], A1 @
  72. ( J3 b/ L, ~* x! i5 s: A; M
  73. type4 Q$ }6 S% [( }0 P
  74.   IMMDevice = interface(IUnknown)9 T+ H6 a" H2 r2 l
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']: L+ A0 ^7 M4 @' b/ D
  76.     Function Activate(  refId :TGUID;
    & n/ O$ d6 q/ V
  77.                         dwClsCtx: DWORD;
    ' k  t$ a; @4 W# T- A1 U
  78.                         pActivationParams: PInteger ;0 o: h& v4 k. X& U/ v; P9 E
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;1 V$ E/ S" s! _
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    $ t! ~# C# `& l& n) G
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    $ H& t: w5 }- J1 V7 r0 D& r
  82.     Function GetState(out State :Integer): Hresult; stdcall;  r( |7 v( Z; u! e

  83. * f. m( B: o) m+ t2 c
  84.   end;
    ) r+ \+ ~7 s' a2 }) Z: m  ^. Y
  85. 8 x/ }% `3 A9 l3 {0 t

  86. ; W: H4 ~/ N: o' B
  87.   IMMDeviceCollection = interface(IUnknown)3 {/ z; `. N( G) m# \1 [1 W
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']% s4 j1 I4 x% f! r
  89.   end;
    ' \( q4 l+ `6 o5 v7 ]7 b/ F

  90. ) k9 e9 |: t$ V( P# }
  91.   IMMNotificationClient = interface (IUnknown)5 [* ^5 r1 ]( u5 {1 z7 L
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    5 _# q/ Y  J8 L6 a6 ?
  93.   end;1 }& U' ~, c8 }! ]2 J/ L# w

  94. ( Y7 X5 o2 F; ?2 ]
  95.   IMMDeviceEnumerator = interface(IUnknown)
    " L. g9 I/ u* k- r7 v; w# U
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']1 O) u. Z# {4 V+ S, t
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;6 }) W; X4 r3 F9 R# r6 T& f# |5 m- F
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;; M- \+ K$ j8 L1 w$ F, R
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    5 Q: `% J! M- I" s
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
    ) q) ^# G6 h: j: D! P( \& }' H, E
  101.   end;
    - |) R8 R7 U4 D3 }* ?' a  }* k
  102. # M$ B: g. A$ x2 Y
  103.   implementation- O- L2 T" x3 h6 y5 i; ~' D4 [
  104. end.; Y) o$ t/ J1 H6 k- Z
  105. # A: l$ T/ d1 _6 K9 |6 b
  106. Thanks & Reagrds,
    7 _8 {# b  I  [: X  i7 n
  107. Mukta ...4 D- {/ L2 Y9 n# i5 X
复制代码
  1. ( q$ b% |! Y( r, V: U+ `& X
  2. it's work in Delphi 7
    5 W: [- K% V7 _) y6 r
  3. //////////////////////////, o) {8 b3 u6 I! W' j1 s

  4. 0 ]$ K6 f. z- z2 {2 z& E: g2 O
  5. unit MMDevApi;! f2 B% b8 G+ ]4 W

  6. 7 y, s2 N! |7 C' i4 _
  7. interface+ c) s5 X# k3 \& V) b. R" v

  8. 5 u$ I9 H7 v* T; Z1 |" z4 a% Q
  9. uses
    2 b0 k4 m- b  Q) G3 F
  10.   Windows, ActiveX, ComObj;. G$ S7 _7 \/ K% ?+ C
  11. 6 d" ~$ F1 m/ d8 J6 y
  12. const7 y: x* |5 }" U% }
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    * v! j4 I" L% Q+ A
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';3 I. A) L* U1 a/ E: J: o. F# W: Y+ Z0 Z
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';6 c* s8 r& W  W% d: S7 v" @7 Q1 L$ o$ C
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';0 c# p5 d) T& I2 r
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';' y7 y; V6 N+ w# `, x( s1 B
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    # L$ b' _3 @8 A3 e/ w
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    , H% C' ?# d; [; X' ?: ~

  20. % ~1 |$ u7 R, N: b" X
  21.   DEVICE_STATE_ACTIVE                   = $00000001;9 m5 u+ a$ p( l! ?; Q2 E
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;! S8 Y: n$ ]* K- j# r
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;
    / V& V4 }6 M7 ?) o9 P5 ^
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    & {; S" C* [$ i' }. ]" t, R
  25.   v' v3 B4 N2 U$ }
  26. type
    9 T5 E4 i! u+ `( j% X
  27.   EDataFlow = TOleEnum;2 k# y; P3 n- ^& B" l( w* j, f
  28. . C1 ^  `# E0 u( `3 @# E
  29. const  d2 @5 w& B% e4 v
  30.   eRender                               = $00000000;
    ! V6 u2 T* o* ]# Y
  31.   eCapture                              = $00000001;9 I8 v; r. W3 F7 d7 z3 e
  32.   eAll                                  = $00000002;
    5 v& d5 D0 w6 |
  33.   EDataFlow_enum_count                  = $00000003;
    ( L0 G2 h9 R+ F! Z2 y" K7 D6 E

  34. ; R* O( B( o8 D5 B3 J/ M
  35. type
    + |, J9 D  E) p7 x% r2 Z' C. J3 R
  36.   ERole = TOleEnum;
    ( {% ^* j. q; f$ v. n2 V

  37. 6 y; Z; P$ E' i8 i
  38. const
    + {4 U- \3 w6 A% \: C
  39.   eConsole                              = $00000000;
    ( Q/ M) `- q7 U" R% I! F+ v6 \
  40.   eMultimedia                           = $00000001;
    ; a2 R! a5 a- {& @' V* Q, C/ B" @
  41.   eCommunications                       = $00000002;
    , w6 B6 ?3 P% K. |
  42.   ERole_enum_count                      = $00000003;
    6 ]. |, d& J! r% m

  43. 5 v8 V3 P* c3 R# p+ e7 U$ ~3 }* S. Q
  44. type
    $ _  b2 `+ ~% t; j& j% `5 h
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    # ~- A. c; m: a+ Z0 m. i- y
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']3 R/ i) V. O8 c" {4 a! f
  47.   end;
    / X  e' N2 v7 m) y8 Y

  48. 1 K' E$ X5 `# }& n- U
  49.   IAudioEndpointVolume = interface(IUnknown)
    " o7 F! i, w1 |9 K. X
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']$ J+ e6 W- [4 ?& R2 y' j
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    2 S8 j* z# r- c" F
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;, V1 g1 o! |3 _4 I
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    7 h: l' S" n5 {3 p" o3 n
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    3 o1 W) L3 ]# Y; j3 Z) Q
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    3 f6 q& \! s( v2 U: _( I5 K
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    6 z  L8 |$ @: @
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    1 @/ L; g/ U, i1 H/ d$ A
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;( n' I( r7 \! n9 T% B& _. e6 w5 @7 [
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;1 r& J* n. c; b' {3 i- A3 }5 W
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    0 _: a3 V. H  J9 q# `) T7 o  G5 F
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    " i' C( K( @0 R/ [, \
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    9 J; U- Q1 [- _1 B! s/ [- d
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    , B  U' d- r2 K8 O( e8 w* ]
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;) A2 Y8 v) I" i# V& m
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    5 D8 M' Z( S5 ~' |
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;+ G$ l- R9 M! I
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;. S" P8 _$ T% g9 @% L# S$ }8 l- b
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;/ N7 w# R5 h8 W& |) o$ l8 C8 p
  69.   end;
    , ?9 [1 y+ H1 j8 O4 U9 R1 Y

  70.   m" K% l6 C& y% ?( }8 N5 V
  71.   IAudioMeterInformation = interface(IUnknown)
    5 q6 A1 Y' A9 c/ q$ K1 ]
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']' s: B. G/ M$ B. D' u
  73.   end;
      @6 [' O+ K8 ~" w8 p7 N
  74. - O0 I2 y$ W5 y. \8 E- G* M2 ]. n
  75.   IPropertyStore = interface(IUnknown)2 J2 J+ m& [- m$ P
  76.   end;
    3 N. }/ V  i' ?+ O9 M$ D
  77. + \4 [5 \: y  n6 \7 s8 v
  78.   IMMDevice = interface(IUnknown)
    , B# }$ [) l- ?) @8 V
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']; R9 \% E2 h' ?9 K8 r# Z$ f
  80.     function Activate(const refId: TGUID;- ?6 s% A- I, r0 N' q) B1 H6 x# w
  81.                       dwClsCtx: DWORD;
    & j7 P- u" ], O$ I4 Y
  82.                       pActivationParams: PInteger;
    6 z( _* w, R. P: B9 s
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;) d9 k" h5 r, ~. f) i
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;% m; u0 Y7 F4 U; Y3 }- A
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    9 ]0 x. z& Z* l9 V& h  f) l; z4 j
  86.     function GetState(out State: Integer): Hresult; stdcall;9 z6 [$ j6 {( L9 y
  87.   end;" o  k7 V" R, a3 d2 W: r8 |0 l

  88. 5 y$ ^& u2 ?& N$ G
  89. ! S( g' C7 E1 o% P; a
  90.   IMMDeviceCollection = interface(IUnknown)$ y9 K- w% ?7 _0 V/ {
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    6 O! B( O) x) x9 p% s! Y, V' \
  92.   end;) N% q. d- N6 X% A# L4 G

  93. : J7 ^4 G( r" Z( c
  94.   IMMNotificationClient = interface(IUnknown)& e0 q( L/ v9 V( h  J8 ~+ x$ B: a, T
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']' {+ v, g# l. V7 I+ u) ~
  96.   end;
    $ v, D+ ?6 D- Z. U8 M! c
  97. ' _( P  r/ ^! o4 m
  98.   IMMDeviceEnumerator = interface(IUnknown)1 @" U. w+ {2 a1 l  `& C
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    4 C$ z# t" j! c
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    , p( N0 g) x3 _2 {) c0 @
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;# Z$ s, ^4 h3 L* ~
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;' S7 h7 r9 c/ \5 _8 \; X& h( z
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    " v+ M1 }' ]8 y  Y& n# K& ]7 Q
  104.   end;
      f  \3 {3 Y6 U1 G4 D

  105. / V5 j' h) `/ Q5 ?3 J
  106. implementation9 z9 x1 Q3 i  q- R% N
  107. 0 ^' D2 R6 }" a- T3 o1 v* t, |
  108. end.5 y! v8 T/ g0 {. O

  109. ; w) L9 A' i' r) M
  110. ///////////////////////! _/ @4 F/ F! S0 e/ ^9 y+ ]5 w
  111. simple sample :)  j+ c- Q* R7 t2 D# b# B  X
  112. ///////////////////////
    & d' a/ d  H5 e" @/ d
  113. $ {0 o  Q% d3 [: \+ D8 Q% {. U4 r4 Q% J
  114. //...... other code6 ^: y1 a8 E2 x# `9 r3 k

  115. ) a5 I2 d" u$ S' g
  116. uses ... ActiveX, MMDevApi, ...;
    ; F) W. [1 F/ D3 f' w. g

  117. 3 _- @0 Z' n9 T; e& v6 R! m
  118. //...... other code" v( p- p' Q6 ?3 x$ N; \8 q# s& T  L* L
  119. . D1 U1 m+ l% |! x  t
  120. var5 t$ [; P8 s  J4 t: ~
  121.   endpointVolume: IAudioEndpointVolume = nil;
    8 W; a. h' n# n6 F5 _: f
  122. 0 C6 V# x0 [, V- n7 P5 X7 _
  123. procedure TForm1.FormCreate(Sender: TObject);8 N5 _# C' `# J2 i7 c3 P
  124. var' F8 a& o- y" i: D. X- }
  125.   deviceEnumerator: IMMDeviceEnumerator;
    : R6 h0 ?$ {* T
  126.   defaultDevice: IMMDevice;
    . ?/ E, A7 O3 u! C
  127. begin. V1 e* r6 j' s% O
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);; I* F2 E: {" q7 F# `  u
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);
    0 d: ]1 x3 T  R' h) Z
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);) Y% \1 N' a( K7 A0 }5 V; c  m
  131. end;$ \$ ?$ \- c! f, e! C8 {0 H
  132. ' q2 E/ Y+ i3 Y8 p
  133. procedure TForm1.Button1Click(Sender: TObject);! b# J3 R/ g7 S) }: t" n
  134. var
    5 Z( `5 |* N8 D  L
  135.   VolumeLevel: Single;
    7 G/ j& H* Y+ {$ \9 k5 w
  136. begin
    ) R) {- `6 ^$ A% ?- S$ u
  137.   if endpointVolume = nil then Exit;- W. r! J( @4 u# m4 E: t
  138.   VolumeLevel := 0.50;
    1 F' C. Y! g! X1 \2 Z+ Z
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    ; z+ `  L# j8 w! }% [" [2 N
  140.   Caption := Format('%1.8f', [VolumeLevel])3 T$ k! m1 u: X9 `, S
  141. end;. j$ \) {: X8 C2 d6 t2 O3 P

  142. 3 K& v9 p! m% i) W4 [/ M. Q
  143. /////////////////////////////////////
    * R  B( v  |" l: z

  144. ; y! U; A3 H4 w" m
  145. // with best regards ToxicDream; v: j- ^& I% S! G+ a3 u/ f
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