发信人: delfan(你不疼我谁疼我)
整理人: teleme(2001-03-25 20:35:04), 站内信件
|
unit Volume;
interface
uses windows,mmsystem;
type
Tvolume=record
left,right:word; // 取值范围 0--65535
end;
procedure fillstruct(control:PMixerControl;var Cdetails:tMIXERCONTROLDETAILS);
function getpeak(control:PMixerControl;var peak:integer):boolean;
function setvolume(control:Pmixercontrol; volume:Tvolume):boolean;
function getvolume(control:Pmixercontrol; volume:Tvolume):boolean;
var
mcontrols:array of array of array of PMixerControl; //mixer的数组,单声卡可以不用
fmixerhandle:HMIXER; //mixer的句柄
implementation
procedure fillstruct(control:PMixerControl;var Cdetails:tMIXERCONTROLDETAILS);
begin
Cdetails.cbStruct:=sizeof(cdetails);
cdetails.dwControlID:=Control.dwControlID;
cdetails.cbDetails:=sizeof(integer);
cdetails.hwndOwner:=0;
end;
function getpeak(control:PMixerControl;var peak:integer):boolean;
var
details:TMixerControlDetailsSigned;
cdetails:tMIXERCONTROLDETAILS;
begin
Result:=false;
if control.dwControlType<> mixercontrol_controltype_peakmeter then exit;
cdetails.cChannels:=1;
cdetails.paDetails:=@details;
fillstruct(control,cdetails);
result:=mixerGetControlDetails(fmixerhandle,@cdetails,MIXER_GETCONTROLDETAILSF_VALUE)=0;
end;
function setvolume(control:Pmixercontrol; volume:Tvolume):boolean;
var
details:array[0..30] of integer;
cdetails:tMIXERCONTROLDETAILS;
begin
fillstruct(control,cdetails);
cdetails.cChannels:=2;
cdetails.paDetails:=@details;
details[0]:=volume.left;
details[1]:=volume.right;
result:=mixerSetControlDetails(fmixerhandle,@cdetails,MIXER_GETCONTROLDETAILSF_VALUE)=0;
volume.left:=details[0];
volume.right:=details[1];
end;
function getvolume(control:Pmixercontrol; volume:Tvolume):boolean;
var
details:array[0..30] of integer;
cdetails:tMIXERCONTROLDETAILS;
begin
fillstruct(control,cdetails);
cdetails.cChannels:=2;
cdetails.paDetails:=@details;
result:=mixerGetControlDetails(fmixerhandle,@cdetails,MIXER_GETCONTROLDETAILSF_VALUE)=0;
volume.left:=details[0];
volume.right:=details[1];
end;
end.
// 调用方法:
procedure TForm1.Button1Click(Sender: TObject);
var s : Tvolume;
kz : Pmixercontrol;
begin
new(kz); //<------------ 此处一定要分配内存
kz.dwControlID := 0;
s.left := 0;
s.right := 0;
try
setvolume(kz,s);
except
end;
freemem(kz);
end;
----
弹钢琴,弹琵琶,弹棉花.....弹什么都行,就是不许谈恋爱! |
|