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| http://bbs.2ccc.com/topic.asp?topicid=496558 大家可以看看这个帖子。
 调用 DLL。也可以使用 TEncoding
 
 function GetVerifyCode(fileName: PByte; strsn: PByte; var strCode: PByte): BOOL; stdcall; external 'GetVerifyCode.dll';
 
 procedure TForm1.Button1Click(Sender: TObject);
 var
 aFile, aSn, aCode: string;
 PFile,PSn, PCode: PByte;
 ACodes: TBytes;
 begin
 aFile := 'verify_code.bin';
 aSn := '535727843';
 PFile := addr(TEncoding.ANSI.GetBytes(aFile)[0]);  //建议 GetBytes(aFile + #0)
 PSn := addr(TEncoding.ANSI.GetBytes(aSn)[0]);  //建议 GetBytes(aSn + #0)
 SetLength(ACodes, 6); //ANSI 是 6 Unicode 是 6*2。//建议多留一个字符的空间,用于存放 #0
 PCode := addr(ACodes[0]);
 if GetVerifyCode(PFile, PSn, PCode) then
 begin
 aCode := TEncoding.ANSI.GetString(ACodes);
 ShowMessage(aCode);
 end
 else
 begin
 ShowMessage('获取密码失败!');
 end;
 end;
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