TFileStream操作

{对Unicode文件进行替换}
function TForm22.SearchIniFile(const FileName: string;const SearchText: string;
  IsReplace: Boolean;const ReplaceText: string): boolean;
var
  getStream: TFileStream; {声明一个文件流}
  setStream: TFileStream;
  getPath: String;
  meint, I, J: LongInt;
  pstr: Pchar;
  mestr, mestr1: String;
  bool: boolean;
begin
  getPath := FileName;
  getStream := TFileStream.Create(getPath, fmOpenRead);
  meint := getStream.Size;  {得到文件长度}
  getmem(pstr, meint+2);//申请字符指针内存
  fillchar(pstr^, meint+2, 0);      {清除内存中原有的内容}
  I := getStream.Read(pstr^, meint);  //在流里读出meint大小的字符串到字符指针
  mestr := strpas(pstr);             //字符指针转成字符
  freemem(Pstr);                        {释放}
  getStream.Free;                        {关闭}
  if PosEx(SearchText, mestr, 1) > 0 then         {表示inString中有一句话SearchText}
  if Pos(SearchText, mestr) > 0 then
  begin
    bool := true;
    fileNum := fileNum + 1;
    bl := true;
    if IsReplace then
    begin
      mestr1 := StringReplace(mestr, SearchText, ReplaceText, [rfReplaceAll]);
      setStream := TFileStream.Create(getPath, fmCreate);
      J := length(mestr1) * 2; //字符长度
      pstr := Pchar(mestr1);//把字符串转成字符指针
      setStream.Write(pstr^, J);//把字符串写入流中
      setStream.Free;
      ProgressBar1.Position := ProgressBar1.Position + 1;
    end;
  end
  else
  begin
    bool := false;
  end;
  StatusBar1.Panels[0].Text := '找到 ' + IntToStr(fileNum) + ' 个文件';
  result := bool;
end;