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The code that comes from this is far from "perfect". Also far from "完全にする"... but it DOES work, and it illustrates a few things.
It reads a text とじ込み／提出する "the old fashioned way", a line at a time. This DOES have its uses!
As the code 供給（する）d with this tutorial stands, you can read a few lines from a とじ込み／提出する, without having to read it all. With a small とじ込み／提出する, the difference is unimportant. With larger とじ込み／提出するs it becomes important, in some uses of the とじ込み／提出する.
With slight 拡張s from what appears here, it is possible to read a とじ込み／提出する from the end に向かって the beginning. Or 追加する things to a とじ込み／提出する, without first reading the 残り／休憩（する） of the とじ込み／提出する into memory.
It is incomplete in that it doesn't 答える／応じる 井戸／弁護士席 if, for instance, you try to look at the contents of a とじ込み／提出する when the とじ込み／提出する isn't 現在の on the 貯蔵 you are 接近ing. There are other 類似の 欠陥s, such as needing code 追加するd to call CloseFile, to do things "適切に"... but I 嫌疑者，容疑者／疑う that all necessary "の近くにing" happens anyway, when the app の近くにs. Better to do it explicitly, though.
But it is a good start, one that can be taken その上の, can を取り引きする all the "stuff" which ought to be dealt with. Like, for instance, 反応するing graciously if asked to fetch lines from a とじ込み／提出する that isn't 現在の on the disk.
(The data とじ込み／提出するs this can read, by the way, are とじ込み／提出するs created by simple text editors, e.g. Notepad (解放する／自由な with Windows), or the excellent and affordable Textpad... with which I've written my web pages for as long as I can remember, certainly for more than 15 years.
More good news: the 完全にする sourcecode, with all 関連した support とじ込み／提出するs is 供給するd for you in a .zip 古記録 which will download from my server if you click the link.
その上に, it shows you how 確かな elements of the 仕事 can be "wrapped" in subroutines.
AND it uses 使用者 defined types to make the code "tidier", more elegant.
So... NOT good as an introduction to the old "assignfile"/ "readln" method of 接近ing a とじ込み／提出する... but still a tutorial with 長所, I hope you will find.
I am indebted to the Good Stuff at http://wiki.freepascal.org/File_Handling_In_Pascal for the help I had from there.
Some months after I wrote the pages you are reading, I wrote another tutorial in which I touch on creating and using what are essentially custom data-types, the 使用者-defined 記録，記録的な／記録するs. That tutorial, also, 演説（する）／住所d two topics. What it says about using sub-部隊s in your program is 直接／まっすぐに applicable to things 現在のd here. That newer tutorial is "Using "部隊s" in Lazarus (or Delphi) programming".
Not only does this tutorial repeat, re-work （警察などへの）密告，告訴（状） about using 使用者-defined 記録，記録的な／記録するs, but it also has かなりの overlap with another tutorial about FindFirst/ FindNext. That 代案／選択肢 tutorial is "Using "FindFirst" and "FindNext" in Lazarus programming".
There is, 式のs, an annoying 欠陥 in the code so far.
It WORKS! Don't worry.
Reading とじ込み／提出するs like this 伴う／関わるs three things...
That's "all". In the code below, I've done the second step with a nice, elegant (井戸／弁護士席, more elegant than some 代案／選択肢s) sub-決まりきった仕事 which "hides" most of the messy 詳細（に述べる）. Once you have done AssignFile, you can call udrReadLineOfData as often as you like. Each call returns a string 持つ／拘留するing the next line of the とじ込み／提出する, and an error code. If that code is 無, there was no error, the 構成要素 in the string should be something from the とじ込み／提出する. The "udr" at the start of the 機能（する）／行事's 指名する, to signify "使用者 Defined 資源", because that is the value it returns is of a 使用者 defined 記録，記録的な／記録する type.
So far, I have not been able to "包む" the code for the first step into a subroutine. It ALMOST 作品... beware of not noticing that the nearly working system I have, 現在の in the code in remmed- out 声明s, is not working. If you look carefully, the first line reads okay, as do, I think, the 3rd, 4th, and に引き続いて lines. But when the second line is read and passed to the 覚え書き for 査察, a little 汚職 of the 生産（高） arises. The 生産（高） SHOULD look like...
7 >>lt12k20a03000000019<< 6 >>ws12k20a03000339116<< 5 >>rf12k20a01000000842<< 4 >>cmOnOff1 is alarm status, OnOff2 is doors<< 3 >>cmSnipped 以前: 2012-07-23<< 2 >>cmSnipped 2012-12-05... had to take out some nulls at atart of ss12l05n15 line<< 1 >>cmStartedx with 構成要素 snipped by 手渡す from end of previous.<< --- This memo is to let us see the data which we'read from the file. --- The reading of the file, and displaying of the data is stopped rather crudely in this demo program.
... in other words you should see the first seven lines of whatever is in LDN194datafile.txt. (Although that looks like gibberish, perhaps, it is a 本物の data とじ込み／提出する from my FarWatch app, which 監視するs 気温s and other parameters, save the data, 陰謀（を企てる）s a graph, and makes the graph 明白な in 近づく real time across the internet.)
At the moment, the 感情を害する／違反するing code only takes two lines, and do the 職業. But that code does not take care of all the Things That Could Happen... like the とじ込み／提出する you said you 手配中の，お尋ね者 to look at not 存在するing on the disk. Nor can you change the とじ込み／提出する you want to look at without changing the program's coding. By the time you 追加する all the basic features of a "proper" "始める，決める up the 関係 to the とじ込み／提出する", it will take rather more than two lines!
The code I've 含むd in remmed out lines "should" have worked. It's probably something simple, silly. (If you 位置／汚点／見つけ出す it, I would be VERY pleased to hear from you!!)
Using the 準備／条項s in most Pascals, 含むing Delphi and Lazarus, to define a custom "type" to 持つ／拘留する a 記録，記録的な／記録する designed to 会合，会う your needs can be very helpful when you are 取引，協定ing with subroutines which need to pass several 関係のある values 支援する and 前へ／外へ.
The 使用者 defined 記録，記録的な／記録する lets you "一括 up" more than one "variable" in a "選び出す／独身" "thing". I've used 使用者 defined 記録，記録的な／記録するs in the code below. I've done a general introduction in my tutorial Introducing 使用者 Defined 記録，記録的な／記録するs. (That also introduces using 多重の 部隊s.)
部隊 ldn194u1;
{$mode objfpc}{$H+}
//デモ of 接近ing a とじ込み／提出する with AssignFile and ReadLn, using
// subroutines and 使用者 defined 記録，記録的な／記録するs to make the code "neater",
// and "elegant".
//Needs to have code for calling CloseFile 追加するd, to do things
// "適切に"... but I 嫌疑者，容疑者／疑う that all necessary "の近くにing" happens
// anyway, when the app の近くにs. But better to do it explicitly.
//Needs to have code 追加するd to send 支援する error 報告（する）／憶測s, 経由で the .wErr
// element in the TDataFileOpenResult or TDataFileRecord 記録，記録的な／記録するs,
// as 関連した.
interface
uses
Classes, SysUtils, FileUtil, Forms, 支配（する）／統制するs, Graphics, Dialogs,
StdCtrls, ExtCtrls, LDN194readingsu1;
const
vers='05 Feb 16';
//(公式文書，認めるs to myself....
//Started 03 Feb 16, when I should have been doing 税金s, etc, etc.
//その上の work one morning when I was going to BE matinee, and was
// still in Chi.
type TDataFileOpenResult = 記録，記録的な／記録する //no ; here
dfHandle:textfile;
wErr:word;
end;//of 宣言 of 使用者-defined-記録，記録的な／記録する type: TDataFileOpenResult
type TDataFileRecord = 記録，記録的な／記録する //no ; here
sRec:string;
wErr:word;
dfHandle:textfile;//Must be passed 支援する and 前へ／外へ,
//with calls of readln, etc. because contents change.
//The "扱う" is a thing which keeps 跡をつける
//of place in とじ込み／提出する, if nothing else.
end;//of 宣言 of 使用者-defined-記録，記録的な／記録する type: TDataFileRecord
type
{ TLDN194f1 }
TLDN194f1 = class(TForm)
laCyclesCount: TLabel;
laTxtCycles: TLabel;
tiMainCycleClock: TTimer;
手続き FormActivate(Sender: TObject);
手続き FormCreate(Sender: TObject);
手続き tiMainCycleClockTimer(Sender: TObject);
私的な
{私的な 宣言s }
public
{public 宣言s }
liTmp,liCyclesCount:longint;
sDtLgPath,sDtLgName:string;//Path to 含む "/" at 権利 手渡す end,
//if not null, 指示，表示する物 "use app folder"
udrDataFileOpenResultTmp,udrDataFileOpenResultDtLg:TDataFileOpenResult;
dfDtLg,dfKludge,dfErrLg:textfile;
手続き DoRead;
機能（する）／行事 udrOpenOrCreateDataFile(sPath,sName:string):TDataFileOpenResult;
機能（する）／行事 udrReadLineOfData(var dfTmpL:textfile):TDataFileRecord;
//扱う comes IN 経由で parameter, is passed BACK as part
// of resulting 記録，記録的な／記録する.
//Returns 0 in .wErr if no problem （悪事，秘密などを）発見するd... but at 05 Feb 16
// doesn't LOOK for errors, and will ALWAYS return 無.
end;
var
LDN194f1: TLDN194f1;
実施
{$R *.lfm}
{$R+}
{ TLDN194f1 }
手続き TLDN194f1.FormCreate(Sender: TObject);
//var udrTmpL:TudrDataFileOpenResult;
begin
sDtLgPath:='';//Path to 含む "/" at 権利 手渡す end,
sDtLgName:='LDN194datafile.txt';
//(* THIS WORKS.. BUT NOT ELEGANT!!
assignfile(dfDtLg,sDtLgPath+sDtLgName);
reset(dfDtLg);
//(end of "THIS WORKS" *)
(*doesn't work, but "SHOULD"!!... (TKB: see also DS052) 05 Feb 16
udrDataFileOpenResultTmp:=udrOpenOrCreateDataFile(sDtLgPath,sDtLgName);//Do this and next with one 決まりきった仕事 in 予定 course.
if true{no error} then begin
dfDtLg:=udrDataFileOpenResultTmp.dfHandle;
end//no ; here
else begin
{報告（する）／憶測 problem};
end;
//End of "Doesn't (work), but should"
*)
end;
手続き TLDN194f1.tiMainCycleClockTimer(Sender: TObject);
begin
inc(liCyclesCount);
laCyclesCount.caption:=inttostr(liCyclesCount);
if liCyclesCount<8 then DoRead;
end;
手続き TLDN194f1.FormActivate(Sender: TObject);
begin
liCyclesCount:=0;
LDN194ReadingsF1.meTmpDisplayFileRead.lines.（疑いを）晴らす;
LDN194ReadingsF1.meTmpDisplayFileRead.
lines.挿入する(0,'the data is stopped rather crudely in this デモ program.');
LDN194ReadingsF1.meTmpDisplayFileRead.
lines.挿入する(0,'The reading of the とじ込み／提出する, and 陳列する，発揮するing of');
LDN194ReadingsF1.meTmpDisplayFileRead.
lines.挿入する(0,'---');
LDN194ReadingsF1.meTmpDisplayFileRead.
lines.挿入する(0,'the data which we''read from the とじ込み／提出する.');
LDN194ReadingsF1.meTmpDisplayFileRead.
lines.挿入する(0,'This 覚え書き is to let us see');
LDN194ReadingsF1.meTmpDisplayFileRead.
lines.挿入する(0,'---');
end;
手続き TLDN194f1.DoRead;
var udrFrmFileL:TDataFileRecord;
begin
udrFrmFileL:=udrReadLineOfData(dfDtLg);
//Using dfDtLg in the above is NOT a problem, kludge, etc.
//Returns 0 in .wErr if no problem （悪事，秘密などを）発見するd... but at 05 Feb 16
// it doesn't LOOK for errors, and will ALWAYS return 無.
dfDtLg:=udrFrmFileL.dfHandle;//Need to update what is in the
//全世界の dfDtLg after calling udrReadLineOfData. Often this
//could be done by using a VAR parameter. Not sure how to
//do that more elegantly when the parameter is a 使用者
//defined 記録，記録的な／記録する. (The data in the 扱う to that とじ込み／提出する changed
//inside the ReadLineOfData 機能（する）／行事.
if udrFrmFileL.wErr=0 {i.e. No error during 機能（する）／行事} then begin
LDN194ReadingsF1.meTmpDisplayFileRead.
lines.挿入する(0,udrFrmFileL.sRec);
end//no ; here
else begin
//Run error 103 may be "とじ込み／提出する not open"
//Need to make this and udrReadLineOfData fancier, make the
//latter 報告（する）／憶測 WHICH error 遭遇（する）d, and the former
//を取り引きする all that can be 心配するd.
LDN194ReadingsF1.meTmpDisplayFileRead.
lines.挿入する(0,'機能（する）／行事 "udrReadLineOfData"' +
'遭遇（する）d problem');
end;//else
end;//DoRead
機能（する）／行事 TLDN194f1.udrOpenOrCreateDataFile(sPath,sName:string):TDataFileOpenResult;
//At 05 Feb 16, this was not QUITE working. Sigh.
//SEEMED to work, unless you looked closely...
// その後の readln's held bad data.
var
udtDFOR_tmpL:TDataFileOpenResult;
dfTmpL:textfile;
begin
udtDFOR_tmpL.wErr:=0;//Assume for now no error seen.
assignfile(dfTmpL,sPath+sName);
reset(dfTmpL);
//Needs error checks 追加するd, which should make udtDFOR_tmpL.wErr 非，不，無-無.
udtDFOR_tmpL.dfHandle:=dfTmpL;
result:=udtDFOR_tmpL;
end;//udrOpenOrCreateDataFileOld
機能（する）／行事 TLDN194f1.udrReadLineOfData(var dfTmpL:textfile):TDataFileRecord;
//扱う comes IN 経由で parameter, is passed BACK as part of resulting 記録，記録的な／記録する.
//This becomes really nice to have when your app is 取引，協定ing with
// more than one datafile.
var udrTmpL:TDataFileRecord;
begin
udrTmpL.wErr:=0;//Init with "no error seen"
try
readln(dfTmpL,udrTmpL.sRec);
except on E: EInOutError do begin
udrTmpL.wErr:=999;
end;//except
end;//try.. except
udrTmpL.sRec:=inttostr(liCyclesCount)+' >>'+udrTmpL.sRec+'<<';
//The ">>", "<<" 追加するd to show up anything
// that looks like a space, at start or end
// of string fetched.
//The direct 言及／関連 to the 全世界の variable
// liCyclesCount is Bad Programming... but it is
// here JUST to number the lines, in the 生産（高）
// and the mis-use is not so very aggregious, I think.
udrTmpL.dfHandle:=dfTmpL;
result:=udrTmpL;
end;//udrReadLineOfData
end.
井戸／弁護士席... 価値（がある） at least what I was paid for 令状ing it. I hope you 設立する bits useful.
Search across all my 場所／位置s with the Google search...
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Page WILL BE 実験（する）d for 同意／服従 with INDUSTRY (not MS-only) 基準s, using the 解放する／自由な, 公然と accessible validator at validator.w3.org. Mostly passes. There were two "unknown せいにするs" in Google+ button code. Sigh.
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