Solved

displaying text file content to a Tmemo

Posted on 2003-11-03
8
500 Views
Last Modified: 2010-04-05
 I am currently trying to write a program that reads the contents of a text file to display it into a Tmemo, i have written the following code, it does not compile! help please

procedure ReadFromFile(Memo1 :TMemo; '/root/test.txt':String);

var

OpenFile : TextFile;
Outstring: string;

begin

Memo1.Lines.Clear;
AssignFile(OpenFile, '/root/test.txt');
Reset(OpenFile);
ReadLn(OpenFile, Outstring);
Memo1.Lines.Add(Outstring);
CloseFile(OpenFile);
end;
end.

The error that i get is  at the first line " identifier expected but string constant found"  I Have tried some modifications on the program like  removing"; '/root/test.txt':String" which makes it compile successfully, but then when i run the program it does not read and display the contents of the text file in the Tmemo. what am i doing wrong? And i could I change this program for it to display the contents into edit boxes. Thanks
0
Comment
Question by:itektas
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
8 Comments
 
LVL 5

Expert Comment

by:arjanh
ID: 9674334
You can simply import a text file into a TMemo as follows:
Memo1.Lines.LoadFromFile('/root/test.txt');
0
 

Author Comment

by:itektas
ID: 9674382
I will try that now, but where in my code does it go?
0
 
LVL 5

Expert Comment

by:arjanh
ID: 9674383
And line 1 sould read something like
procedure ReadFromFile(Memo1 :TMemo; FileName:String);

Within that procedure you then use
Memo1.Lines.Clear;
AssignFile(OpenFile, FileName );
Reset( OpenFile);
while not Eof( OpenFile ) do
begin
  ReadLn(OpenFile, Outstring);
  Memo1.Lines.Add(Outstring);
end;
CloseFile(OpenFile);

When you call ReadFromFile in your main program, you have to give the filename:
ReadFromFile( myMemo, '/root/test.txt' );
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 5

Expert Comment

by:arjanh
ID: 9674402
My earlier sugestion would become

procedure ReadFromFile(Memo1 :TMemo; FileName:String);
begin
  Memo1.Lines.Clear;
  Memo1.Lines.LoadFromFile( FileName );
end;

and again, somewhere in your program you would do
ReadFromFile( myMemo, '/root/test.txt' );
0
 

Author Comment

by:itektas
ID: 9674524
when i do the following

procedure ReadFromFile (Memo1:TMemo; '/root/test.txt' :String);
begin
Memo1.Lines.Clear;
Memo1.Lines.LoadFromFile('/root/test.txt');
end;

the compiler doenst seem to like the first line at all! it keeps saying identifier expected but string constant found. I'm also a bit confused when you say that I need to include ReadFromFile(myMemo, '/root/test.txt'); Does that need to go somewhere else besides the implementation of the program? The same thing happens when i try the first program you told me, it doenst like the first line and says the same error ? thanks
0
 
LVL 5

Accepted Solution

by:
arjanh earned 20 total points
ID: 9674624
There are two things: you _define_ a procedure, and you _call_ it from somewhere.

The procedure is like a recipe: do something with the given ingredients (in this case a TMemo and a String). This procedure can load any text file into any TMemo. In this case, 'Memo1' is just a label for the procedure to know what TMemo to update.

Try adding a button to your application, and in the OnClick handler (just doubleclick the button in designer), add a call to this procedure:
ReadFromFile( Memo1, '/root/test.txt' );

Know when you click the button when running your app, the recipe will be executed, with ingredients Memo1 (the TMemo on your form) and the filename '/root/test.txt';

To play a bit more, try adding a second TMemo (Memo2) and button (Button2) to your app, and in the OnClick of Button2 add:
ReadFromFile( Memo2, '/root/test.txt' );

This will read the same text file into Memo2, using the exact same procedure (recipe)!

Good luck.
0
 

Author Comment

by:itektas
ID: 9677695
ok it works now!! I had to change one thing tho, whenever i put the filename into the procedure it would not compile, but it works when i remove it.

procedure  ReadFromFile (Memo1 :TMemo);
begin
Memo1.Lines.Clear;
Memo1.Lines.LoadFromFile('/root/test.txt');
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
ReadFromFile( Memo1);

thanks for that mate,
0
 

Expert Comment

by:computerprogramer
ID: 9683290
This was my code a whle ago ...

procedure button1.click (TSender: TObject)
begin
memo1.Loadfromfile ('c:\text.txt')
end;
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question