拼音首字符序列来检索 .txt

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---- 3．键入以下两个函数 

// 获取指定汉字的拼音索引字母，如：“汉”的索引字母是“H”
function GetPYIndexChar( hzchar:string):char;
begin
  case WORD(hzchar[1]) shl 8 + WORD(hzchar[2]) of
    $B0A1..$B0C4 : result := 'A';
    $B0C5..$B2C0 : result := 'B';
    $B2C1..$B4ED : result := 'C';
    $B4EE..$B6E9 : result := 'D';
    $B6EA..$B7A1 : result := 'E';
    $B7A2..$B8C0 : result := 'F';
    $B8C1..$B9FD : result := 'G';
    $B9FE..$BBF6 : result := 'H';
    $BBF7..$BFA5 : result := 'J';
    $BFA6..$C0AB : result := 'K';
    $C0AC..$C2E7 : result := 'L';
    $C2E8..$C4C2 : result := 'M';
    $C4C3..$C5B5 : result := 'N';
    $C5B6..$C5BD : result := 'O';
    $C5BE..$C6D9 : result := 'P';
    $C6DA..$C8BA : result := 'Q';
    $C8BB..$C8F5 : result := 'R';
    $C8F6..$CBF9 : result := 'S';
    $CBFA..$CDD9 : result := 'T';
    $CDDA..$CEF3 : result := 'W';
    $CEF4..$D188 : result := 'X';
    $D1B9..$D4D0 : result := 'Y';
    $D4D1..$D7F9 : result := 'Z';
  else
    result := char(0);
  end;
end;

// 在指定的字符串列表SourceStrs中检索符合拼音索引字符串
PYIndexStr的所有字符串，并返回。
function SearchByPYIndexStr
( SourceStrs:TStrings;
 PYIndexStr:string):string;
label NotFound;
var
  i, j   :integer;
  hzchar :string;
begin
  for i:=0 to SourceStrs.Count-1 do
    begin
      for j:=1 to Length(PYIndexStr) do
        begin
          hzchar:=SourceStrs[i][2*j-1] 
+ SourceStrs[i][2*j];
          if (PYIndexStr[j]<>'?') and
 (UpperCase(PYIndexStr[j]) <>
 GetPYIndexChar(hzchar)) then goto NotFound;
        end;
      if result='' then result := SourceStrs[i]
      else result := result + Char
(13) + SourceStrs[i];
NotFound:
    end;
end;

4．增加编辑框Search的OnChange事件：
procedure TForm1.SearchChange(Sender: TObject);
var ResultStr:string;
begin
  ResultStr:='';
  ResultList.Items.Text := SearchByPYIndexStr
(Sourcelist.Items, Search.Text);
end;