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it's work in Delphi 7
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unit MMDevApi;
interface
uses
  Windows, ActiveX, ComObj;
const
  CLASS_IMMDeviceEnumerator     ......

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dpr Ϊ¹¤³ÌÎļþ
dfm Ϊ´°ÌåÎļþ
pas Ϊµ¥ÔªÎļþ
cfg ÅäÖÃÎļþ
dof ΪÏîĿѡÏîÎļþ(Ò»°ãûÓÃ)
dcu compiled   unitsÎļþ ,±àÒëºóµÄµ¥ÔªÎļþ
res ×ÊÔ´Îļþ
ddp Îļþ¾ÍÊÇDelphi   Diagram   Portfolio¼òд,ÊÇÓÃÀ´±£´æCode   EditorÖеÄDiagramÐÅÏ¢µÄ.
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  Òò´Ë£¬ ÎÒÔÚÕâ¸öprocedure TForm.FormCreate(Sender:TObject)ÖУ¬
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Delphi µÄ×Ö·û¼°×Ö·û´®[1] - string¡¢AnsiString¡¢WideString¡¢String[n]¡¢ShortString
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//×î³£ÓÃµÄ string
var
  str: string;   {¶¨Òå}
begin
  str := 'ÍòÒ»'; {¸³Öµ}
  ShowMessage(IntToStr(Length(str))); {³¤¶ÈÊÇ: 4}
end;
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