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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, W4 t& J4 O+ f; \# h
By Mukta & ToxicDream
  1. 6 h' f8 o3 ^3 T9 {# z4 d5 U
  2. //for delphi 52 ?" w5 X6 E+ J5 ]) C& O
  3. unit MMDevApi_tlb;
    + ^# D4 V. M" y
  4. - x) x# C' \  c+ D
  5. interface
    $ v1 K6 O0 ]; w/ e: G8 l
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;. ~# X# C' d$ t8 |  E: z0 o
  7. const. Q" W( D! J$ f: m$ W
  8.   // TypeLibrary Major and minor versions
    , P; _2 E# D$ N) }

  9. 6 {# ?! X  v( N# T; h* X; p
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    + O1 q: i9 y4 I% }
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';& A! J! o% Y( Z9 W, ~: k! d- ]
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';& G, ?4 E1 J% i
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';5 l! m- Q0 a- u% v- R% L/ H
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    : t5 j! Z! L$ T2 E9 r
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';" G" x: q- D: J: P/ @( l
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';7 Z' U7 x8 T9 Q6 t

  17. " f& p) @/ R3 x4 Q6 |7 E' l" A
  18.   DEVICE_STATE_ACTIVE                   = $00000001;
    1 G8 a2 [5 m( Y6 z. m
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;
    6 i9 H/ ~' M2 \: f1 j$ K
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    ) x- T* |8 |. o3 S& B2 d8 h0 N  G9 ^
  21.   DEVICE_STATEMASK_ALL                  = $00000007;" O' }9 \  a/ H& u

  22. $ M  T' g, i+ _- L
  23. type2 t# `/ h$ H- V% q; ^' E
  24.   EDataFlow = TOleEnum;
    1 ^8 P' s1 W+ ]7 w; h
  25. const1 ~1 A/ k- {' r  c
  26.   eRender                               = $00000000;
    , y0 A. Q1 D# G1 L4 ?
  27.   eCapture                              = $00000001;
    / g7 H7 Y) a# P; Z
  28.   eAll                                  = $00000002;
    : Z2 G/ j' y7 Q! g8 \3 ^& u
  29.   EDataFlow_enum_count                  = $00000003;6 P9 P& h7 l% W
  30. - o. `+ ^4 U! n- [) {3 l1 q
  31. type
    1 N/ M/ e- A& ^7 _% Y" X
  32.   ERole = TOleEnum;7 c7 A' j# c* l. {
  33. const
    / z% k6 U0 f2 @7 n0 e1 U$ f" f  _
  34.   eConsole                              = $00000000;
      E6 m# A+ d. s$ @0 r
  35.   eMultimedia                           = $00000001;
    4 r; j) D/ }" i. V: {& q
  36.   eCommunications                       = $00000002;9 ?( ~2 F% P$ A' t& P; @0 D
  37.   ERole_enum_count                      = $00000003;. x+ R+ M/ m5 O* u
  38. 3 w; t+ a: D3 |
  39. type: ?2 [8 j' \+ ~
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    0 s7 K& B$ e5 P9 X7 O4 ~- p8 @
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']5 m: ^2 B. [& i; |3 Y& m
  42.   end;3 D; s/ y' }7 f5 X3 k+ w

  43. ! i5 F! D0 f9 {2 P4 R) M
  44.   IMMAudioEndpointVolume = interface(IUnknown)3 s0 o  C# L& l$ r( Q( d  Y3 Q
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    7 x7 p( d6 |! ]9 t& V
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    4 ?# u$ b. L8 g' z) w  A- C7 s
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;0 y6 z0 j/ e6 c; X" T
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;
    6 l8 W# A& s9 ~; V
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    + e) ^+ C" i) S: e$ v8 ^
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;) E8 l6 s; ~" r8 k; S; Z
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;8 u' x. Y. `( ]$ i, Q5 C; s
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;
    3 i2 S+ z: {& w
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;% w& L  ?3 H; p" K
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    3 l9 e  l, V( D8 _5 n
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    % k$ R: @) m2 {& N" @
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;6 Z& N" L9 ]+ O, m5 h" U6 u7 c
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    , }% r9 m1 l5 C% P: O
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;; N7 V% x1 ^4 _# G! R
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    - G5 [6 F3 G6 ^. z( u4 P0 A
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;, G) _: `! B/ R  n5 m. r1 @
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    / J' B5 R( P2 Y3 t  P1 ^* o: m
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    # C+ d3 x3 |. @- k1 ^# n' N; I
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;$ t4 D4 z* d& z" {
  64.   end;
    8 h6 V5 L: O6 ]; \& l( a
  65. / U6 n& p9 @9 p
  66. {  IAudioMeterInformation = interface(IUnknown)8 y- s" x1 d1 S& b/ T( j/ e
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    6 z" o' ~4 V: y- W# W0 }0 i' C( v) S
  68.   end;}7 X% N8 G  d1 A( R8 \0 `/ B6 h

  69. ' J/ T  K7 [1 O3 ^+ U
  70.   IPropertyStore = interface(IUnknown)# ^, R5 y4 A$ U8 Z
  71.   end;: Z0 B4 K0 ?% h& ^& j$ X1 s: c9 k

  72. 0 h% x. `) H7 T- r( Q
  73. type
    # ?( D. V! `- u+ D- E
  74.   IMMDevice = interface(IUnknown)
    3 t9 }" P' U( H& l" d* p% W
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']# G' K  f; A$ I; r' q
  76.     Function Activate(  refId :TGUID;
    / R  ?4 D4 Y, D# H
  77.                         dwClsCtx: DWORD;5 @& j  D; l! M+ i
  78.                         pActivationParams: PInteger ;9 x: N2 y, g/ \1 E6 i' b( h( j: \
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;) E+ F' N% g) v; [8 B
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;/ @, n4 h, k: ?0 n4 B$ ?1 v5 p! n
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;2 m( a5 k9 }3 g1 i. m3 y
  82.     Function GetState(out State :Integer): Hresult; stdcall;. a/ S5 w% I7 A! n0 [" E

  83. 9 M9 U- V0 C/ [+ c1 X6 ?3 R8 C
  84.   end;, v  p& u( k- U! o

  85. 4 Y1 L0 H2 X  C( V7 m* Y5 V
  86. + b1 C$ p$ e6 {' w/ o
  87.   IMMDeviceCollection = interface(IUnknown). T( p; V; z& }4 ^
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}'], m9 ?! d/ N8 D. O
  89.   end;9 r3 v' F0 @4 g+ N
  90. 6 b' d6 l+ s/ p/ y, f. m7 T
  91.   IMMNotificationClient = interface (IUnknown)
    % v' S% d. R1 S0 P+ L3 Y& q7 G5 c1 H
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']1 S1 @! u4 Y$ G$ ^$ s$ H8 W; M( E
  93.   end;: |' _+ z) Y0 P( K5 h) u& j3 L

  94. : T5 L5 |9 P' j1 N
  95.   IMMDeviceEnumerator = interface(IUnknown)2 O6 C4 v( F; [+ G/ }
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
    - y7 C& T) ?6 i0 u# G) D; B2 H
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;4 h. ]. X; ?: [& M
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;/ U7 N3 Q# F! r( r: i8 \7 W
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;$ O% g' T3 L2 s4 d
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;) p6 x+ {* a+ {$ y
  101.   end;) I0 L- `8 ]" l

  102. % {% \' u. |4 H
  103.   implementation
    ) m6 |; j- x9 a. i; y
  104. end.
    % @: p2 H' S" u; U+ O

  105. 9 l! [3 P, k9 F0 F6 s! A& C# x: N0 A
  106. Thanks & Reagrds,
    2 |0 \- W6 c" ?+ v
  107. Mukta ..." j; x/ ]+ G8 T0 ^
复制代码
  1. 1 O  m' S/ R3 W* P7 _6 W( K
  2. it's work in Delphi 7. a4 }- _1 ]+ j6 c  @* H8 g% r$ a
  3. //////////////////////////
    ) d, A( k% ^! k9 g4 y  E* s
  4. * {, a" C" h7 F7 v+ V3 t% A
  5. unit MMDevApi;' o) A: a$ c/ W+ V6 T# m

  6. # L$ j. ?7 ~7 |* o7 m" u
  7. interface
    , s. y; W: v7 {, @+ q$ D
  8. ( h8 s7 H0 [  S/ D
  9. uses' k+ {$ S1 ^- e! H+ M6 {
  10.   Windows, ActiveX, ComObj;3 {* d: b/ M( Z1 q. D8 g+ Z' J

  11. " d. z7 E* {/ s0 X. {+ Y: |
  12. const
    * S8 o- T) P/ L$ q$ c
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
    8 R6 ]2 ]! g( ^& [' @$ o
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    + |  K6 ~, u1 o1 m3 R6 c
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    # |; H0 ^. u6 `( K  d( ?/ ~  v2 o
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';4 h* e% x+ S! J( R  \3 y! ]; l
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    : C5 p: Q3 q& o* w3 o% C: ?
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    " A* J# h& g* I7 i. I
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    % }6 d2 {( ~( b+ I7 A
  20. 8 t+ b; \. h) }$ s) V
  21.   DEVICE_STATE_ACTIVE                   = $00000001;$ p) A! t: w; h3 n! ~7 K5 B8 Q
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    / T1 ^9 v. B/ @2 b2 l
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;& l3 \7 R+ `. B' a. M! }
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    + _- z0 c% c4 s0 f, p) y$ I6 I5 y% ?

  25. # K7 Q# N+ w& ?$ ]; X' T1 R
  26. type& v- ^6 R. J) L+ I
  27.   EDataFlow = TOleEnum;
    % Y0 @" f, \6 z, ~- M# {
  28. ' B, T* k* ]. i4 A7 Y# \# o
  29. const
    / _. Z, q& }$ O; |) A: l& j
  30.   eRender                               = $00000000;' ^& ]( ~( z/ \9 `: M- G- R
  31.   eCapture                              = $00000001;
    1 S3 a( n. |4 {4 T2 O9 C
  32.   eAll                                  = $00000002;
    . _- _$ _& l; _) O, E$ `) X" V
  33.   EDataFlow_enum_count                  = $00000003;
    2 A0 l' R% ?8 [# Y2 m* }
  34. . G9 J; ~! S( s/ @
  35. type1 j9 u, q, e$ }6 l6 i' b! J
  36.   ERole = TOleEnum;
      m5 q0 p8 H: f+ n8 L0 K" l
  37. . C6 N( _0 Y% J$ j: W, M
  38. const
    1 F4 Q) E7 u7 V/ R
  39.   eConsole                              = $00000000;
    % j; K0 {6 S9 `- s  Y1 A
  40.   eMultimedia                           = $00000001;% u: C$ z. d& D+ x/ T
  41.   eCommunications                       = $00000002;
    * P' f* O% _! ~/ C8 I) b; g+ ^7 j) c
  42.   ERole_enum_count                      = $00000003;
    2 I! S' \, v+ `: j

  43. 0 e0 R8 t3 g( `3 }; h
  44. type
    2 R1 O; M+ Z+ e0 }* h  ?
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)' U$ I) s. X2 D
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']( z3 O/ ~/ s: J2 Y
  47.   end;
    8 N' p# ]6 Z* M7 D  t( a3 M
  48. 0 ]) t5 e6 S4 h7 v1 x
  49.   IAudioEndpointVolume = interface(IUnknown)
    3 z& S: Z+ h7 a* X
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']& n/ F  Z: J7 w. L
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
      l# X' ]4 W+ W" v( e: R7 g; S
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
    5 a0 w# m8 Y: Z6 V" y  M5 N
  53.     function GetChannelCount(out PInteger): Integer; stdcall;( u* l) K5 s4 a3 b" c$ N
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;* I3 {, K7 s8 l$ W' }6 ^( A, V0 z
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;: Z; \7 S5 T( m3 f0 G3 ^
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;! J- ?3 x9 _; r0 T* ^
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;
    4 D& c, I! R! U  V9 ~
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    4 _3 c5 H" L, ^
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
    9 X1 m0 W- ~5 K1 \9 [
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    ! a2 {( D; y, `8 r% y
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;
      w; m/ t8 I( o+ x5 A9 c6 _
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    # G% n$ e0 T, W. V+ U* t: o
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;( h  W* |5 @" X" `1 h
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;8 [  H7 d: T& L4 k' X" a
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;
    ) M: _+ O  D& {
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;
    2 E9 k( }1 |( [6 g& y
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;! I# H1 _# k+ n0 d- p/ b
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;# G, J! s/ {4 j* P' t* I; j
  69.   end;
    : E, r6 @# o: w) n5 D. }1 P

  70. " c" j6 L: e2 G+ }, w! l# [
  71.   IAudioMeterInformation = interface(IUnknown)" t9 p/ Q6 N. j1 x' h$ Y4 B7 e
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
    $ S2 O5 P# F+ ]  ]) C# Z
  73.   end;
    2 |* j+ w5 N& [

  74. - ~' D) B& R1 v
  75.   IPropertyStore = interface(IUnknown)2 |+ ?3 s+ E4 N1 D1 M- {0 r
  76.   end;
      G% X1 E% P2 _. h3 i

  77. ' ^0 W7 i1 x; s( [% |) ~
  78.   IMMDevice = interface(IUnknown)) @1 N0 n! A: \8 n; z1 i3 ~$ U
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    7 H; P/ V) I! E1 o( Y
  80.     function Activate(const refId: TGUID;7 o, Q" a4 O# I5 L9 U' y
  81.                       dwClsCtx: DWORD;
    : U5 P1 t/ t- x1 j
  82.                       pActivationParams: PInteger;$ D* f0 y% E- U& i& W' O2 [
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;7 y. o) e) c# I& f0 t
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    0 I9 k# e: W+ x( z
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;' w+ u/ N- m% \. x7 X- s5 ^
  86.     function GetState(out State: Integer): Hresult; stdcall;
      {2 z0 R: P( T( n. x
  87.   end;0 p: W/ N4 P- i2 t& K7 Q' ?

  88. ) P' L$ H# y4 \1 E3 A9 j+ v) r
  89.   r+ {) {5 _6 _4 T
  90.   IMMDeviceCollection = interface(IUnknown)$ f: V7 i, H- a4 v# T
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    1 K% m# x0 O, ?2 y+ ^
  92.   end;
    8 j+ O! J" w9 J
  93. 9 s/ B7 t6 p: N1 ?5 n! M
  94.   IMMNotificationClient = interface(IUnknown)
    3 W1 ]% c& h! e  C: o% Z; p
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    5 @1 S7 ~4 m5 z. p
  96.   end;: ^5 ~/ ~8 ?5 }5 Y5 \$ N* _& B% H
  97. 8 B' I, g$ d2 D) d
  98.   IMMDeviceEnumerator = interface(IUnknown)3 ^+ X. p/ M# T! J- g$ p
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']9 c% @0 n4 v1 `7 t9 A" _
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;# a2 }1 {2 \+ V# |' E% B
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;! J" O$ A, s) A% U! ~  u. Z) g
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;, `7 A8 |- V6 S, n. Z
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;
    ; ]2 E: M$ o, j! E. b6 U/ N9 h8 ]
  104.   end;- k/ g& m/ w$ d( c. p8 y: w, e4 T

  105. 5 L% ^8 x1 s& H
  106. implementation8 j9 _; }0 {  l2 u

  107. 0 S4 q& C" @% h/ x* `7 g
  108. end.3 N( m. v5 `6 x

  109.   z9 a7 G7 D  h
  110. ///////////////////////
      j' Y; O5 C. Y! H
  111. simple sample :)) d# Y$ u5 e7 F/ u- J5 x1 o, U
  112. ///////////////////////4 b; O  Y# K" d$ x

  113. ; s3 i+ i$ b. [/ j# Q3 e
  114. //...... other code: I; j! K1 `: L1 \# i0 ~4 w  p
  115. * ?/ j! Q3 n* d  V6 c! L
  116. uses ... ActiveX, MMDevApi, ...;: x' X3 \+ D8 @/ z& y4 A

  117. % ?4 Q4 c6 i+ [2 e* I4 l9 H
  118. //...... other code
    9 s: v+ J& }, p! i

  119. # H% |* W& B2 J4 ^9 i1 v- m
  120. var$ p; c/ T; Q# H- L9 n& B( t7 m
  121.   endpointVolume: IAudioEndpointVolume = nil;
    7 X0 d5 a2 v; Q# E+ r0 ^
  122. $ A5 Z$ k$ }9 u$ ]+ ?8 F# U
  123. procedure TForm1.FormCreate(Sender: TObject);
    3 }- M, a& x) \1 ~4 \+ D
  124. var
    4 B+ W. I: H) @) J; F. a7 g
  125.   deviceEnumerator: IMMDeviceEnumerator;
    7 q% {( B$ `2 y
  126.   defaultDevice: IMMDevice;# Y! j' H  P' V! ?, W! {
  127. begin4 n( I# N" \% v( D: ?$ n7 {$ I
  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);
    ' `0 _6 [. S$ A' t
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);: H" Y/ g9 x  [+ {, l8 {' f6 m& R
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);* G# d/ ?$ ^$ E. k, j4 D! _, F
  131. end;
    ; j& a' C& J7 k1 `$ s' n7 u

  132. ) R# M8 T# [4 B
  133. procedure TForm1.Button1Click(Sender: TObject);
    4 C/ ^* q$ p4 i0 m* @/ b
  134. var
    , Y# o! T/ C" T) r# m
  135.   VolumeLevel: Single;4 G4 w  R& `2 \0 {  S
  136. begin0 I$ K9 i# P! a/ c3 x" v) t2 _7 P
  137.   if endpointVolume = nil then Exit;
    8 Q; x( L; ^+ ]  y- \: y& r
  138.   VolumeLevel := 0.50;3 S! y7 w" D% Y0 _( e
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);
    ' Q) g  q+ ?# @$ i, v
  140.   Caption := Format('%1.8f', [VolumeLevel])
    + |0 z. f5 `1 {! f. j
  141. end;
    % E# S1 R% y( }' d" M6 G6 J! U5 ^9 g
  142. ( Z& \1 m) Y6 p$ t9 s/ W
  143. /////////////////////////////////////# Q( ^' h7 _; T2 ~1 o. c1 B4 E/ U/ c9 T
  144. : V4 M. f+ ]; c* R5 D+ f
  145. // with best regards ToxicDream
    ) F# q+ U( E3 g7 T
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