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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; G+ Y# Q7 }2 b$ LBy Mukta & ToxicDream
  1. - O2 }6 K) e0 M0 c9 p
  2. //for delphi 5# }0 e7 L. h, {5 g) ~0 Q7 S; B
  3. unit MMDevApi_tlb;$ `9 A# _; _+ c5 u8 |$ g
  4. / s- ?3 t' I) M4 a& ~) D9 |
  5. interface
      K8 H* @' \% Y. @  G3 Q4 `3 i5 n
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    6 s% V2 e! U* \5 y
  7. const, u6 _% z$ X1 V. G/ j
  8.   // TypeLibrary Major and minor versions+ j8 B* v- X; X  v9 E
  9. 9 [  S0 i% T/ Z$ y$ o
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    ) @  Z1 [. O7 x% A4 b; {
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';$ Y+ D) l! W- R* G* j
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';4 `( [4 U- V( L, I
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    % n/ `3 m$ A, |0 e( {
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';$ E+ k; @3 S4 E
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    1 H; }% E/ {: v% V0 r
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';$ b2 c- p  T- Y/ U

  17. 9 e3 _- y3 S; }* Y
  18.   DEVICE_STATE_ACTIVE                   = $00000001;- k" _) `6 p# z5 a
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;1 C  \; B( f$ J4 a
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    4 r. b& t) [& A2 _+ A) u, g
  21.   DEVICE_STATEMASK_ALL                  = $00000007;
    ( s( z$ ^4 T/ L1 b/ G) K2 [
  22. ' g' w; B% ]! z
  23. type9 r2 z% E) |  _8 f) B& q/ D: h  y
  24.   EDataFlow = TOleEnum;! V+ x+ `5 E6 G6 i4 f
  25. const( u& o+ G, d7 l5 S/ x" k
  26.   eRender                               = $00000000;# w! ?6 K6 o7 ]: G0 H- t: k, x- @
  27.   eCapture                              = $00000001;0 [% h; F8 l8 v2 W2 ?2 B5 |
  28.   eAll                                  = $00000002;
    2 T; c$ K% |2 |6 [2 k
  29.   EDataFlow_enum_count                  = $00000003;
    . E, d0 t9 g8 g6 B& ?) c

  30. $ ~( s6 S1 W& Q
  31. type4 M+ D+ w1 \3 U7 h6 _' P
  32.   ERole = TOleEnum;
    / m- S$ F/ z1 K* v( m
  33. const; y( b, ?, h0 {6 M
  34.   eConsole                              = $00000000;
    " u4 U. [; j' J8 j3 S* H3 `* f
  35.   eMultimedia                           = $00000001;- ?, x4 m* W% N9 H! P* r4 I
  36.   eCommunications                       = $00000002;
    4 r% ?0 H" p* d7 _6 G2 |8 R
  37.   ERole_enum_count                      = $00000003;
    ' k7 Z3 b" ~& k0 Q. P1 e

  38. . o# `0 p( Q8 p
  39. type
    $ K% D) t2 R7 U
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)' T5 D9 [- b/ V( D+ m7 t
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']- N, o/ V7 n9 t8 g& @6 |
  42.   end;% z& ^  m7 p/ y. l

  43. % _$ ]' B7 i: ]1 u& S0 j
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    ( z7 x+ P; v' r. }
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    . s/ p2 Z2 S0 H4 V7 R* y
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;0 q6 p( {2 d! _6 P! v9 [
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    . P; R6 W1 u/ D. x2 L8 _
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;) h9 L& M! L$ H8 W# |' K( k
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;% V; y" W) {7 E
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;; h4 R, K" }' `
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    1 j- {1 ~, `- j1 h: _3 k( w
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    9 s% Z; J% b0 Q0 Q
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    . Q% E1 {( M8 _
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;+ A% V4 [7 s4 w+ H; ?
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    9 u' S. y0 [4 k! N' O
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;* E. q' a: f" M2 Q" |9 v. G4 Y
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;* f( B5 |3 Y5 z
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    & r( h+ o! _# e3 N% {' S/ E
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;' v' n! a6 I; a6 D" l# @5 q/ o+ Z% b
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;/ ^; u/ b# b5 Y) ~4 [
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;3 t/ W! }3 y1 F+ D. r3 @' L( D, g
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;5 h- e8 C$ x- Q7 O% @& `" b
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;0 Y# E5 a/ m) o( x8 X" c
  64.   end;
      z/ ~2 F; k) x# a

  65. 1 E8 U- Z- t( C) O1 [
  66. {  IAudioMeterInformation = interface(IUnknown)
    4 C- c( a; G. @3 O/ f% x$ y, r
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']0 q& A! X1 t$ r
  68.   end;}
      _8 D1 ?5 [5 v0 K% J) ^
  69. 8 _  n. d; @0 [- L5 U
  70.   IPropertyStore = interface(IUnknown)
    6 N) \& Y- m: _% D% B+ P
  71.   end;
    # }  C& W  ~/ ^5 Q+ Q  I! @

  72. # f3 `$ G9 a$ L
  73. type6 ?- ~) V1 B$ A, V. {
  74.   IMMDevice = interface(IUnknown)
    7 ~# j) }8 m# \
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']1 ?+ e) Y- o) i! H% o3 r6 ?
  76.     Function Activate(  refId :TGUID;
    8 c2 q9 ]0 x( m3 X$ H3 F% X$ Y: Z8 `' ?
  77.                         dwClsCtx: DWORD;
    - A4 Y! M  v6 _
  78.                         pActivationParams: PInteger ;5 i. X. n2 b& C2 B* N& z: s9 ^7 I
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;4 Q1 k) i" s% A+ M% z
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;3 q1 C9 y: D- W2 Y2 F2 L! g8 {
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
    2 [* H- Z7 Z! E" D; B
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    $ d0 p& J8 ]2 p  N  A5 V7 M' J$ Z! n
  83. " c& {$ ]& G/ z# H4 X
  84.   end;
    5 C+ a8 n- d5 F& D! F2 @

  85. & `  L, M" r2 D% x! E
  86. : X: W* o8 y2 H8 e  D3 e) Y
  87.   IMMDeviceCollection = interface(IUnknown)
    $ x  i) V' w9 Q
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']/ j+ u! K1 l6 y6 |2 L  D0 |2 H1 ~! z; H
  89.   end;9 o, d2 A! u0 c' v4 B

  90. $ y7 m5 ^* Q1 Z( G8 d4 l
  91.   IMMNotificationClient = interface (IUnknown)
    + ]" K% F1 {) m* E
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    # A0 R0 L: W* R/ ]- P/ b& X
  93.   end;- e5 L# M7 A0 w

  94. * S/ a8 }5 c: V
  95.   IMMDeviceEnumerator = interface(IUnknown)6 U/ q: G  @- p, e, K
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    + _  d. w' [7 G  ^4 P# `8 i
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
      x- C- U- K9 c% `: U, A
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
    ) r" d' b: r. m  P3 F+ z4 a2 z
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    % B" y7 `- p0 `5 {
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;: \% H0 _' E6 D8 u8 z
  101.   end;
    % _9 b+ A8 v4 c- @5 X
  102. 9 Z- L: ]" v9 A& Q
  103.   implementation4 o2 ~5 N/ F" L% z
  104. end.
    ) E! t1 t2 S6 o" O/ K

  105. 5 A; @$ d; z1 f0 x. q, F: M
  106. Thanks & Reagrds,9 D+ _2 V5 S7 Y$ ^+ u7 j& g
  107. Mukta ...9 K% \# P# L" L& O
复制代码
  1. ) f3 B/ ~4 Z' z  D2 V3 t
  2. it's work in Delphi 7
    : }9 W+ x4 v2 B  _2 ?' q
  3. //////////////////////////6 A7 A1 R+ n' Z9 F0 a* q' ?

  4. 6 I! }! ?( ^. k+ y
  5. unit MMDevApi;
    ) H  T* K$ v) l/ m: ^1 q" X
  6. + Q, B. z4 C7 I+ P% [$ l
  7. interface
    ! W$ l1 E+ x2 ?  ]" A
  8. & M& s  \8 L9 X- x7 A
  9. uses
    / ~7 h7 d. b% Z5 L
  10.   Windows, ActiveX, ComObj;  \% Q' ]3 P# Z5 k' p
  11. & v7 `6 x2 w1 m/ a/ s4 D8 Z
  12. const& O6 m) F" f8 k2 [
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';; r1 n# ?6 a$ E5 Y' R
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';# }) w5 o& I' d9 N5 u8 B5 U
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';6 x3 v' H  S( e. o% \
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    / Y( a/ b! _1 o$ N  c. @5 _
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    - G7 y% _+ [% w$ k4 [  R
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';6 \. ?& M, N8 u2 R$ U
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    6 y1 b& X- |, p2 u
  20. ( w( U  S% N1 d$ Z, p8 |4 x1 ~
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    0 t% I. x" @6 V# \" i; j4 j: P1 d
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    ' @9 h" C- r6 G2 H
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;3 U7 ]; L% |% C( ~. L
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    & H; @) T; W( L6 ^7 s4 b" r
  25. $ ^' u- H  q9 _2 t$ G; q) F
  26. type) `" d8 ?* |/ d# X/ A
  27.   EDataFlow = TOleEnum;
    . Y/ A# {( Y& M: n9 x
  28. + r8 w$ i- n$ q
  29. const
    / K' u3 q3 S' y: v+ C8 k
  30.   eRender                               = $00000000;) U* V" t/ h2 |; F" R, J
  31.   eCapture                              = $00000001;
    - v  @1 \- k6 m
  32.   eAll                                  = $00000002;2 C5 ?" z5 [' k  ^! ?
  33.   EDataFlow_enum_count                  = $00000003;0 y: M, Y$ |) h$ ]! O1 @+ v2 a
  34. 3 ?9 S( T" z2 i& N
  35. type
    - u  A& G  p% ~2 d7 p1 E* g
  36.   ERole = TOleEnum;
    ) U& {) J! j7 p; s4 _" @

  37. : H0 O0 D$ s7 O* t2 a2 B
  38. const$ p& T* K! M% N! v0 i
  39.   eConsole                              = $00000000;
    " j( X& o1 _  T
  40.   eMultimedia                           = $00000001;
    5 Y8 m& R- F& t; h) _" q
  41.   eCommunications                       = $00000002;
    8 n/ Z' T# W) \6 x6 L& r
  42.   ERole_enum_count                      = $00000003;
    0 d4 X# \2 `7 K; _: y
  43. 9 o; D( m6 L- `' Y" L/ {! H
  44. type
    6 f4 I5 {9 y) L6 O. i% \9 @  J
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)
    + P5 T& p# w1 {5 }
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']. u+ f: v2 T0 ^4 w2 C- \  e
  47.   end;
    + V. f# v/ [) \

  48. , m5 p$ d+ D& B! [- T: Y( @7 S/ H
  49.   IAudioEndpointVolume = interface(IUnknown); f# a- S% i, ~8 ?5 Q
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    $ h# V# O8 x4 l0 R# H
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    # u" I& a9 v; p* @* y% ]
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;: ?6 p. B; k; G) P, l/ f
  53.     function GetChannelCount(out PInteger): Integer; stdcall;; W5 ^! G  t7 D8 g1 \8 W
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;0 h1 C% o/ U1 u: o- |3 u  E2 X6 H# I
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    5 f9 c, e" s" s
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;- U$ d" u; c% o' Y/ N
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;7 V1 c  `( v! Q; `# u3 x0 \
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    ! X) c. g3 g2 ^
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;8 W% w4 I& E  N2 q
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;5 s* f% |% c0 w; ]2 I
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
    - Z1 y# ?' T  r8 k9 ~
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    4 K$ e' t( }8 P
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;4 `0 o4 m7 d5 J! `; c  T4 L: ?1 k
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;
    8 j; i0 Z' n8 }- y, h! o* V
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;+ e+ w# M. b* U1 O" W
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    - V, C0 t3 Q1 U3 _% Z$ e% H: C
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    - J0 h  f6 |4 s7 A1 k$ {) P
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;2 b3 x* W/ U! R+ N% ]3 V
  69.   end;) _; A" r1 Y. ?
  70.   m1 `! a5 u& g" _2 t0 f
  71.   IAudioMeterInformation = interface(IUnknown)
    ! j0 r  e6 }( @/ M4 g8 n7 k1 e
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    $ `* V' o5 s- Q+ d/ B
  73.   end;( q- F% d" P, Y4 h9 V- E% ^( I9 r

  74. . H" M6 e3 b- h7 b
  75.   IPropertyStore = interface(IUnknown)
    * ?5 Z" ~$ B0 @+ u0 _
  76.   end;7 ^( r% F& r, s

  77. 2 Y/ C5 Y) \* H9 z0 Q
  78.   IMMDevice = interface(IUnknown)  v" e& |4 q+ O; Y" h
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']7 K6 \7 b6 |% g
  80.     function Activate(const refId: TGUID;9 N' s1 m! H- m* J3 g6 Y
  81.                       dwClsCtx: DWORD;4 |( W4 m* q9 |# L, k3 @* J! E5 m" L
  82.                       pActivationParams: PInteger;
    . a4 i+ q, Z6 Z) d) ?
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;) V( H% U5 j5 Y0 [$ \4 l
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;1 s4 J+ e4 h- w1 h) f
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;
    8 V3 j  Q  K! ?. k3 y/ j+ r
  86.     function GetState(out State: Integer): Hresult; stdcall;
    4 D9 u" m- C$ [  M
  87.   end;
    % X3 o$ G4 |/ l. ]" @& M/ V; o! _
  88. ) j; m& C& C; E# j

  89. . W) H) Z7 P/ o4 |8 o4 j3 [
  90.   IMMDeviceCollection = interface(IUnknown)6 M" F  R# W$ ^: g
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    $ b3 G* K$ N5 w% B! O
  92.   end;
    $ s0 p9 `; E: F; e

  93. 8 U$ M" K3 z, Y# s( N0 r* e4 J2 s
  94.   IMMNotificationClient = interface(IUnknown)
    1 f2 x3 W: G2 {& P
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']$ ~& z2 L! M+ M1 e
  96.   end;
    8 k* M, ^: Y9 L/ T  m) Z6 ^

  97.   @/ A0 @$ D: m, b. d& A  j
  98.   IMMDeviceEnumerator = interface(IUnknown)
    ' Z; [2 ?7 ^& m& d9 v0 S5 H
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    ' T; F8 p. [+ u' K. W7 f
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    0 J' R0 l6 v2 `0 `7 K( i
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;& T, P; e) F, g  U% {; p. ^+ W
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    2 Z2 q( {0 ^) G6 x$ V) k/ c
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;4 u  |- X2 B' |* H# n. t/ V4 ]1 v% V: O5 `
  104.   end;
    # D8 V; h, `4 V, @
  105. " t3 ]5 ^5 ?8 r2 N9 y8 b
  106. implementation
    " }2 h; ?8 _/ {: J/ }$ J; @
  107. , a- z* b0 X( e7 v$ E
  108. end.! x  E4 K$ `9 r: a5 F
  109. * I; G: x: \: U0 T+ k
  110. ///////////////////////$ `+ n5 P! g9 a! j# R4 K; \
  111. simple sample :)% \: s- u1 D' G1 f
  112. ///////////////////////
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  113. ! @: z) \( o0 J$ v8 b6 w
  114. //...... other code
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  115. 4 T! y0 [' \& X8 p6 G
  116. uses ... ActiveX, MMDevApi, ...;& D. M; d0 ?/ k3 |& g9 f  M1 i
  117. * b- U1 `! V* j% a# Q; l1 f
  118. //...... other code
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  119. ) w- Y" s7 |3 Y3 J
  120. var  W+ [5 Y! D, }( ~0 S
  121.   endpointVolume: IAudioEndpointVolume = nil;
    5 y  \) E0 d2 J

  122. $ Y; x" F- \' w# t; b- [$ q
  123. procedure TForm1.FormCreate(Sender: TObject);. A! b2 W9 [/ c6 q: o! _4 C
  124. var& [% S3 y. \- J
  125.   deviceEnumerator: IMMDeviceEnumerator;
    - d% A, b( A0 P
  126.   defaultDevice: IMMDevice;/ ~# M+ D" |6 A5 b$ @1 E
  127. begin
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  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);; T8 Y5 Z' a9 |, \9 Q
  131. end;1 M+ a$ r2 M- C; z: X7 x, ]
  132. , G; F6 r/ `+ V" m* z: i# j
  133. procedure TForm1.Button1Click(Sender: TObject);
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  134. var
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  135.   VolumeLevel: Single;
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  136. begin
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  137.   if endpointVolume = nil then Exit;: R3 b- k! g7 N' D5 L9 {
  138.   VolumeLevel := 0.50;
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  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
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  140.   Caption := Format('%1.8f', [VolumeLevel]); p1 F. B2 a* [1 u! |0 ]% [6 w
  141. end;
    ' p( t$ P: k0 c5 _

  142. , w9 `* K& |% |1 i' |
  143. /////////////////////////////////////' H6 p$ K0 c7 u* j
  144. * N& l( ?* G6 x2 }$ U
  145. // with best regards ToxicDream
    + ?& ^- N6 o3 |/ ~
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