//声明:sndPlaySound(  lpszSoundName: PChar; {声音文件}  uFlags: UINT{播放选项}): BOOL;//uFlags 参数可选值:SND_SYNC      = 0; {同步播放, 程序须等到播放完毕才向下执行}SND_ASYNC     = 1; {异步播放, 在函数返回之后开始播放, 不影响程序继续执行}SND_NODEFAULT = 2; {声音文件缺失时, 函数自动返回不播放默认声音}SND_MEMORY    = 4; {播放内存中的声音, 譬如资源文件中的声音}SND_LOOP      = 8; {循环播放, 需要和 SND_ASYNC 组合使用}SND_NOSTOP    = 16;{如果当前正在播放声音, 立即返回 False}         //举例:unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;type  TForm1 = class(TForm)    Button1: TButton;    Button2: TButton;    Button3: TButton;    procedure Button1Click(Sender: TObject);    procedure Button2Click(Sender: TObject);    procedure Button3Click(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}uses MMSystem; {sndPlaySound 声明在该单元}const  s = 'C:\WINDOWS\Media\Windows XP 启动.wav';//同步播放procedure TForm1.Button1Click(Sender: TObject);begin  sndPlaySound(s, SND_SYNC);  Beep; {播放完毕才会执行这句}end;//异步播放procedure TForm1.Button2Click(Sender: TObject);begin  sndPlaySound(s, SND_ASYNC);  Beep; {马上会执行这句}end;//反复播放procedure TForm1.Button3Click(Sender: TObject);begin  sndPlaySound(s, SND_LOOP or SND_ASYNC);end;end.         //sndPlaySound 也可以用来播放资源或内存中的声音文件, 参加示例: