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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-a8c9-2e27eb9ec0589 c) w7 E) c/ }3 [* U
By Mukta & ToxicDream
  1. 2 H2 d8 @2 a0 t: l
  2. //for delphi 5
    ! P% S- K- c4 O' o/ x
  3. unit MMDevApi_tlb;1 T' f# n; W) B  n, \1 ]8 m/ w

  4. 7 }% ]3 d$ ]+ `( R8 y* x* Y% P% H
  5. interface7 ?* V0 a0 G; z
  6.   uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
    - w" ]8 d2 }* q
  7. const, H4 t8 s9 Y" b/ m+ n" ?0 h" ?
  8.   // TypeLibrary Major and minor versions# T( B# e$ ?( {% t

  9. & J8 X* ]1 T2 _" ?
  10.   CLASS_IMMDeviceEnumerator: TGUID              = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';8 ?* l5 _, y2 T" [' R8 [
  11.   IID_IMMDeviceEnumerator: TGUID                = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';: y3 }6 j( G2 O) l1 Q0 w
  12.   IID_IMMDevice: TGUID                          = '{D666063F-1587-4E43-81F1-B948E807363F}';) x0 n* j5 d4 q: P
  13.   IID_IMMDeviceCollection: TGUID                = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    / }' w) e5 C$ ]5 l* d7 t8 f
  14.   IID_IAudioEndpointVolume: TGUID               = '{5CDF2C82-841E-4546-9722-0CF74078229A}';7 z7 I& A* a3 U% Y
  15.   IID_IAudioMeterInformation : TGUID            = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';, G" e+ b. Q/ h8 _8 q5 l( D
  16.   IID_IAudioEndpointVolumeCallback: TGUID       = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    ! M7 K* L5 V7 ~$ X) o

  17. ' q3 E; s7 d9 f' k
  18.   DEVICE_STATE_ACTIVE                   = $00000001;4 U# B, ~0 k$ I' @4 ~
  19.   DEVICE_STATE_UNPLUGGED                = $00000002;2 R- K- w9 _( w
  20.   DEVICE_STATE_NOTPRESENT               = $00000004;
    - w5 O+ c- h' ?. K* s* t
  21.   DEVICE_STATEMASK_ALL                  = $00000007;. e. u* g  f; O* O

  22. , U! R5 t2 U' _$ ?' A
  23. type
    , f6 u% Q+ o( [  m' N, N# C
  24.   EDataFlow = TOleEnum;
    " w; N3 y9 s) d( d8 l; K
  25. const$ G4 H! e- U/ `  V. j) D- C
  26.   eRender                               = $00000000;
    ( M! ]7 J! b& R+ M7 n
  27.   eCapture                              = $00000001;
    + t1 o& g- E& S- Y7 L
  28.   eAll                                  = $00000002;
    0 W1 L& y+ e( Y/ }! M
  29.   EDataFlow_enum_count                  = $00000003;* g& S" F; l1 u; E

  30. ) _( T( f0 a$ X8 \. k
  31. type  R% p! z7 u3 T$ u$ ?$ ?4 O
  32.   ERole = TOleEnum;
    ( J8 I6 _3 A$ |. i
  33. const' |5 N* s6 j* T' q% @* b
  34.   eConsole                              = $00000000;
    + y# Z/ \# o7 o" v" y
  35.   eMultimedia                           = $00000001;; U. b, d% v; K3 a; n3 K4 O
  36.   eCommunications                       = $00000002;2 @+ i. {" p" b. P! g6 x
  37.   ERole_enum_count                      = $00000003;0 b& _% o7 y$ B) U- L- G

  38. . Y5 A" S7 z7 \- m6 N
  39. type
    6 M4 q. U1 Z, v
  40.   IAudioEndpointVolumeCallback = interface(IUnknown)
    . P. J# p9 J& p" U# ]: w
  41.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']
    0 ?3 T( V- C' P0 o6 I% X
  42.   end;4 ^7 q! X* t% U' j/ [6 F* I
  43. / ?  L7 C: p3 L8 o0 [) t4 K
  44.   IMMAudioEndpointVolume = interface(IUnknown)
    3 S* d. K! U; r( J6 A3 \
  45.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']
    $ G1 I+ U* K+ w
  46.     Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;0 w. c* V( ?: h1 i# B5 H
  47.     Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;& t% |0 q/ a4 u6 ^# m
  48.     Function GetChannelCount(out PInteger): Integer; stdcall;) {$ ~& T, S3 S; _0 t
  49.     Function SetMasterVolumeLevel(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;9 J' l  E  y& K& K( c
  50.     Function SetMasterVolumeLevelScalar(fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;; \, ]& b6 h$ Q# X& V
  51.     Function GetMasterVolumeLevel(out fLevelDB: double):Integer; stdcall;
    ( ]. f, e( c/ N4 {
  52.     Function GetMasterVolumeLevelScaler(out fLevel: double):Integer; stdcall;9 W" d; g$ U( l4 Z6 g% b6 U
  53.     Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
    0 K# R! g3 J8 N6 t* g+ p9 n
  54.     Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;* I+ {) V  j4 t5 T
  55.     Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
    6 B5 ~; g, N% M: P7 s7 r4 ?7 d& J
  56.     Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;5 C1 j1 e6 k2 V% r  X
  57.     Function SetMute(bMute: Boolean ; pguidEventContext: TGUID) :Integer; stdcall;
    2 U8 [- Q$ H3 H: q$ h2 O
  58.     Function GetMute(out bMute: Boolean ) :Integer; stdcall;
    3 k: |' b, D6 E9 B! A- f/ G- S& c
  59.     Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
    7 K$ J9 S7 F+ H: U$ R5 Z
  60.     Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;8 W( h  N, O. c( {+ r9 ]
  61.     Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
    6 v; f# A' j0 N! k$ D9 [
  62.     Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
    3 a  O+ M5 R! M6 ~/ L4 A# _. h
  63.     Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;+ k3 r4 ~* X* I4 B/ ^2 Q( h2 E
  64.   end;4 m" S0 L+ p; J! G8 F1 H
  65. $ ?' {3 F* o/ U" H
  66. {  IAudioMeterInformation = interface(IUnknown)
    7 s8 j! u- H" x7 b+ c, p6 u  o( |
  67.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064']
    9 T, y% {/ I2 T0 g
  68.   end;}( `: {( m4 w8 \
  69. ; O2 ]! z0 j1 R
  70.   IPropertyStore = interface(IUnknown)
    - R# t- Q4 G+ y( q
  71.   end;/ B. y% \- u8 V& Q

  72. 3 ?* c: g3 v7 Q) i
  73. type* Q; l2 A& x3 V( r  S+ h5 X
  74.   IMMDevice = interface(IUnknown)
    * o! s; |5 o7 M& V' a
  75.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    8 k6 E4 ~* ?" C
  76.     Function Activate(  refId :TGUID;
    # L- D) m1 E  z9 J$ D7 C5 E6 X
  77.                         dwClsCtx: DWORD;- z7 S. Y" \3 g% q, C
  78.                         pActivationParams: PInteger ;
    " ?; a5 G  z+ E7 ^1 E: ^. a
  79.                         out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;& |* T& Q/ s' K9 m2 |* g7 W
  80.     Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
    ! E$ o# e# p: a9 r
  81.     Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;6 H6 G, A% `- i; D, c5 _  N0 L
  82.     Function GetState(out State :Integer): Hresult; stdcall;
    0 P; y$ E4 t  Y( f  z

  83. * [/ h% ?, \6 [. S4 @! A. B5 q
  84.   end;
    4 T! b/ Y# Z: V

  85. , G$ Q/ F/ T9 m. n- A+ e1 `% [. T
  86. 4 D: e+ R! V+ D; _
  87.   IMMDeviceCollection = interface(IUnknown)$ h2 [2 A+ w9 @$ B% `
  88.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']: i5 h9 J  |8 k4 F) x; r
  89.   end;3 z; p  o4 t. i

  90. 6 i2 v# b# N  `# Z* S
  91.   IMMNotificationClient = interface (IUnknown)
      Q+ L+ l7 Z* P. U8 H
  92.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']* f( l! S2 d1 d) r' v% m
  93.   end;, e% k  G- R# J

  94. 9 F4 X2 V$ S9 D1 h6 q8 K
  95.   IMMDeviceEnumerator = interface(IUnknown)
    ' h' |) F- @9 x' O) j5 A0 l
  96.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']( F1 V# o9 a7 _$ B
  97.     Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
    * I% J: `$ t9 t" x% S
  98.     Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;) A4 g8 ~1 j+ d, Q
  99.     Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
    9 i  p* V( y% e; N- H8 i
  100.     Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;  C+ o9 ~& U! [6 }2 t% H- P
  101.   end;- t5 {3 [8 [0 G3 J$ \
  102. ! ^! ~  m6 `0 o
  103.   implementation7 A, @! z+ Y1 Y" A0 r6 D; P
  104. end.
    0 S' p! l) D' {7 D0 m- G$ |
  105. 8 `$ z" i- a/ O- b
  106. Thanks & Reagrds,2 x& _$ C4 T6 X- v  b$ {4 x9 b) U
  107. Mukta ...3 ]+ Z4 p# o! x# o$ b
复制代码

  1. 9 w+ C! f3 P6 l+ Z+ t: `/ ]
  2. it's work in Delphi 7; k5 ]# T5 ^0 _2 p1 _
  3. //////////////////////////
    7 C$ _' R8 `: c- t/ w

  4. , Y! f9 P( I  I% A8 }  e# @$ J3 }- }
  5. unit MMDevApi;
    + M5 [& `/ J* |6 ]1 m" I3 L/ h/ c

  6. ! m) D- E) w, ~' `5 l
  7. interface5 M- M7 u( v/ ^

  8.   v/ d8 y& W+ R  h4 }9 ], c& e
  9. uses
    + w& P) J/ a% u& X1 ~
  10.   Windows, ActiveX, ComObj;) \' B) B) G4 v) v8 S( @2 e

  11. . g' A5 r: h* ^  p: M. I
  12. const
      x* u+ u( E2 I" Y
  13.   CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';. }: J, e$ I% @2 c* |. E
  14.   IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
    # G4 o2 ~2 y1 `1 |! M' t
  15.   IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
    7 C+ K2 C; a6 h4 ?
  16.   IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
    7 ?! h* J  v! n4 t
  17.   IID_IAudioEndpointVolume              : TGUID = '{5CDF2C82-841E-4546-9722-0CF74078229A}';
    , U/ a9 J4 [  T. R  Q
  18.   IID_IAudioMeterInformation            : TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
    ; J4 u& _9 M' M4 {
  19.   IID_IAudioEndpointVolumeCallback      : TGUID = '{657804FA-D6AD-4496-8A60-352752AF4F89}';
    " b! I5 X2 Q$ C, Q7 _
  20. 9 p& l1 W( I0 f$ B1 t9 G2 V6 A
  21.   DEVICE_STATE_ACTIVE                   = $00000001;
    # ~. y$ P% i9 J5 W! z; e) T  I
  22.   DEVICE_STATE_UNPLUGGED                = $00000002;
    # A& A; X: p! ^5 Q" G6 j
  23.   DEVICE_STATE_NOTPRESENT               = $00000004;( i# \$ }. y0 X6 z% h$ o2 R
  24.   DEVICE_STATEMASK_ALL                  = $00000007;
    9 B; ?9 B! x6 o2 x; m$ l% i/ f

  25. 3 R1 i2 o+ v* m, W6 O
  26. type
    ! @5 {! Z$ H; s$ t8 [  J% p
  27.   EDataFlow = TOleEnum;
    * z% d5 y' i" d6 b' D" T
  28. ) N% i- c8 t$ D! f
  29. const
    1 y. r" E) Q8 b0 v& P& ~
  30.   eRender                               = $00000000;6 p/ y' G% z6 r1 Q6 N
  31.   eCapture                              = $00000001;9 S% P+ _2 c% E) U+ Y" Q  R9 J
  32.   eAll                                  = $00000002;
    / J6 h( T2 [$ I) G2 g
  33.   EDataFlow_enum_count                  = $00000003;
    % Q# m' T( d& @8 B/ R
  34. $ K9 {) o; C. ~- T# l7 |* a& E
  35. type9 r" P0 R0 @3 k  s% j" x
  36.   ERole = TOleEnum;
    9 d. }) d# v: L7 V+ ?" i0 y5 X+ Y

  37. 6 F2 P7 a: k9 I* D8 ?' I( M
  38. const3 G" m7 H" x. f4 g& g+ R
  39.   eConsole                              = $00000000;
    : W: E4 R5 R+ c/ p2 q
  40.   eMultimedia                           = $00000001;& O$ |3 n- y9 h( E
  41.   eCommunications                       = $00000002;1 x. H/ S$ a, n* U5 [% V
  42.   ERole_enum_count                      = $00000003;4 P; j$ ?) y: Z: J9 A% J

  43. ' [- p- ~7 a" h0 U
  44. type2 ^' w- ?+ j* a" k# l  `* L
  45.   IAudioEndpointVolumeCallback = interface(IUnknown)+ {  p# Z0 h) D2 {0 h7 q& ^
  46.   ['{657804FA-D6AD-4496-8A60-352752AF4F89}']  Q! ~5 N; |& I% l
  47.   end;9 N# W7 x. B2 n0 B+ m, E2 R

  48. - D5 ?# j- Q# Q
  49.   IAudioEndpointVolume = interface(IUnknown): ~9 c+ w- A9 P! K
  50.   ['{5CDF2C82-841E-4546-9722-0CF74078229A}']* w- m4 c! c" O6 _; c: F/ K
  51.     function RegisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;/ T8 p1 C% T. R% H3 p! Z
  52.     function UnregisterControlChangeNotify(AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;; G1 {8 {* S4 D) C8 X3 X. ^0 E
  53.     function GetChannelCount(out PInteger): Integer; stdcall;
    & f7 Y2 o  R- q* \" ?+ k5 J% D
  54.     function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;
    * J/ n, t6 q1 t, l* {  H* ^
  55.     function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID): Integer; stdcall;- g( z( D; W8 F
  56.     function GetMasterVolumeLevel(out fLevelDB: single): Integer; stdcall;
    : N2 O% W+ Y- ?/ ?
  57.     function GetMasterVolumeLevelScaler(out fLevelDB: single): Integer; stdcall;' G) Y% B; D# D1 W7 r
  58.     function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;6 C* S+ d/ C8 M4 L1 D* B  Q) \
  59.     function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: double; pguidEventContext: PGUID): Integer; stdcall;
      J9 m7 `" ?3 w- [! B
  60.     function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double): Integer; stdcall;
    ) D0 n7 j( l: i( d/ ]1 s" K/ z
  61.     function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double): Integer; stdcall;: W! W, F* b# |. D- d  _3 k
  62.     function SetMute(bMute: Boolean; pguidEventContext: PGUID): Integer; stdcall;
    + `/ ]& \3 |' e
  63.     function GetMute(out bMute: Boolean): Integer; stdcall;
    6 x2 B/ H3 H- L0 o
  64.     function GetVolumeStepInfo(pnStep: Integer; out pnStepCount: Integer): Integer; stdcall;2 y7 r6 p/ y- i, ]6 [& U
  65.     function VolumeStepUp(pguidEventContext: PGUID): Integer; stdcall;0 D; |" r8 E+ f7 A! x
  66.     function VolumeStepDown(pguidEventContext: PGUID): Integer; stdcall;: h/ I5 r- I8 H7 {  T
  67.     function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;, `  g) t9 |9 t2 _8 m# L9 y0 c. T
  68.     function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;) Y+ Y5 s/ c( Q; o6 _, ~
  69.   end;
    , L  Y+ y! @* X  v5 e

  70. # N9 f' L7 h! Z) ?0 L# J- c
  71.   IAudioMeterInformation = interface(IUnknown)- u' R. m- n' U3 r  q* X
  72.   ['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']! k9 D& \: n& l  _4 G
  73.   end;4 U* R5 C/ y0 C8 m' A+ I

  74. ) C( _7 O% e" ~9 p) V, X
  75.   IPropertyStore = interface(IUnknown)
    6 V* U4 z& K+ }
  76.   end;, n2 t3 O: O; D3 J4 Q$ B& x) `6 d0 n

  77. 1 k& N# V- ?: J* N5 z& I/ y
  78.   IMMDevice = interface(IUnknown)
    0 M3 w0 J* d  i
  79.   ['{D666063F-1587-4E43-81F1-B948E807363F}']
    8 c1 x! G+ z2 V1 Y8 H0 d" }
  80.     function Activate(const refId: TGUID;' i% v8 T2 s% V, }2 ~
  81.                       dwClsCtx: DWORD;
    1 Z3 y% u9 H+ h1 S
  82.                       pActivationParams: PInteger;
    6 {  R4 ^8 M; v5 h/ ~( m
  83.                       out pEndpointVolume: IAudioEndpointVolume): Hresult; stdCall;% P( w! }. _$ x1 @: _2 q$ ]
  84.     function OpenPropertyStore(stgmAccess: DWORD; out ppProperties: IPropertyStore): Hresult; stdcall;
    , g1 j5 U/ g0 k* H+ g
  85.     function GetId(out ppstrId: PLPWSTR): Hresult; stdcall;7 J- ~) [3 r! V5 ]* V- r
  86.     function GetState(out State: Integer): Hresult; stdcall;# s$ X' X1 m0 I. A
  87.   end;
    ! u1 e  `* O4 P! k
  88. ) g6 z; i$ U  W

  89. . m: k' ^; c! H  H$ X: K1 x/ g( J
  90.   IMMDeviceCollection = interface(IUnknown)
    7 S: C  @3 K  d2 P( ~3 K7 N0 F
  91.   ['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
    + ?* |' ~1 y, v3 I! ~4 L
  92.   end;
    " i/ `# j4 h5 Z7 ]2 _( B

  93. ; Z$ ~9 v6 m3 g( F7 B$ N
  94.   IMMNotificationClient = interface(IUnknown)
    - b9 y6 Z0 G1 l! e2 o
  95.   ['{7991EEC9-7E89-4D85-8390-6C703CEC60C0}']
    8 V9 Y7 H( m! f' d" c( F
  96.   end;* \" }& j& ^* N" I

  97. , a9 s, C5 I; O6 \! C
  98.   IMMDeviceEnumerator = interface(IUnknown)
    % M" f. c9 v6 F, J' t2 r
  99.   ['{A95664D2-9614-4F35-A746-DE8DB63617E6}']4 O5 x; p" V9 U# {8 y0 ^
  100.     function EnumAudioEndpoints(dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection: IMMDeviceCollection): Hresult; stdcall;
    % ]* {9 k( K: L8 v# Z
  101.     function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult; stdcall;3 }6 {# v% A: [9 q7 Y
  102.     function GetDevice(pwstrId: pointer; out Dev: IMMDevice): HResult; stdcall;
    7 X8 R6 U) w+ A2 V. l( S- \
  103.     function RegisterEndpointNotificationCallback(pClient: IMMNotificationClient): Hresult; stdcall;$ N  y& L/ _# H. u6 o! t) n' n% M
  104.   end;: g  c; f3 ~# u$ X% c- J
  105. + }" }) T; N' z& j9 F' [1 v
  106. implementation/ M* t/ X$ f; I3 k
  107. $ e# `6 z8 l  L: I8 M4 H4 t
  108. end.1 `& E9 }& O" }4 B
  109. 3 U* M" q! h. L
  110. ///////////////////////
    ) ]' f* V* y# n6 @: v" E
  111. simple sample :)8 t5 R. N# ~5 \3 p
  112. ///////////////////////# i% v0 N- n# J9 H

  113. % r5 I( ]8 G( g; C
  114. //...... other code& [8 W0 Z; r8 n+ G2 m( ?. s  U

  115. & Z& N1 F3 U9 p
  116. uses ... ActiveX, MMDevApi, ...;
      ^4 I/ {8 n0 F* @' {/ {

  117. $ n. v4 `8 p+ d( m& _
  118. //...... other code
    6 h8 c4 {7 h& F

  119. 0 ?$ a* m  U5 c5 |
  120. var( T! B  f( H$ ~1 }( q0 n
  121.   endpointVolume: IAudioEndpointVolume = nil;, p! _. T. {+ |, O) N7 }7 i6 F
  122. # Z4 o, {8 h5 D5 P, H- {( f' ~
  123. procedure TForm1.FormCreate(Sender: TObject);
    # B0 u% g$ @. l' N
  124. var
    : p% x) z# D$ F1 I
  125.   deviceEnumerator: IMMDeviceEnumerator;# G. g  t6 I* f, [, a
  126.   defaultDevice: IMMDevice;
      a8 V: z% K: |( e" i4 k
  127. begin
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  128.   CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_INPROC_SERVER, IID_IMMDeviceEnumerator, deviceEnumerator);; B4 f, C9 o  D. h0 x7 x6 V
  129.   deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, defaultDevice);* O" ^2 ^1 @6 _3 k- X- S
  130.   defaultDevice.Activate(IID_IAudioEndpointVolume, CLSCTX_INPROC_SERVER, nil, endpointVolume);
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  131. end;/ R, F* M6 ]+ Q! R: \. n' w

  132. 8 \8 U# ]1 z- M
  133. procedure TForm1.Button1Click(Sender: TObject);
    1 z, [( [+ k! g
  134. var
    . K# U: p; d2 S# e  P. _! k
  135.   VolumeLevel: Single;
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  136. begin
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  137.   if endpointVolume = nil then Exit;
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  138.   VolumeLevel := 0.50;0 m% ]( j# n; O6 d7 C' ?
  139.   endpointVolume.SetMasterVolumeLevelScalar(VolumeLevel, nil);! G; Y7 S, L/ [3 Q6 V2 f
  140.   Caption := Format('%1.8f', [VolumeLevel])
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  141. end;" ?- [/ I+ o; `- q

  142. * @+ n4 ^' D' x# w% z( M6 `+ k
  143. /////////////////////////////////////
    $ n  V% p/ b- x, E$ o! G  ^
  144. , d: d! U: ~3 w
  145. // with best regards ToxicDream# H7 t9 v  c# R1 D; o, Z7 u+ z
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