How to clear a TMemo out of lines?

[Elmug]

Good people:

I have the Memo1 with a few lines, how to clear it to zero lines?

I tried lines.count := 0; but that did not work.

Then after I clear it, how to put just one line into it, for example: 'This is line1'.

And also, where can I find documentation on how to use these methods? that start with a .dotMethod for TMemos, and just as well for other type of objects?

Thanks!

[meulinux]

Memo1.Lines.Clear;

 

[Elmug]

Memo1.Lines.Clear;

 

Great help, meulinux.
That's a powerful statement.

Now, if you don't mind, where can I learn things like that (part of my original question).

Thanks!

[felipemdc]

And also, where can I find documentation on how to use these methods? that start with a .dotMethod for TMemos, and just as well for other type of objects?

In google, I just typed "lazarus TMemo" without quotes and the first link was the reference documentation:

http://lazarus-ccr.sourceforge.net/docs/lcl/stdctrls/tmemo.html

And then you can click on links there are find the reference for TMemo.Lines:
http://lazarus-ccr.sourceforge.net/docs/lcl/stdctrls/tcustommemo.lines.html
Then click on TStrings:
http://lazarus-ccr.sourceforge.net/docs/rtl/classes/tstrings.html

Where you can read:

  procedure Clear; virtual; abstract;   Removes all strings and associated objects from the list.

There are also links to docs here: http://wiki.lazarus.freepascal.org/LCL_Components
One other thing, please try to keep questions about the LCL in the LCL sub-forum =) thanks

[BigChimp]

Now, if you don't mind, where can I learn things like that (part of my original question).

See this post - and the next for sources of information on FreePascal, Delphi (handy, as Lazarus is almost always compatible), and Lazarus:
http://lazarus.freepascal.org/index.php/topic,13951.msg73534.html#msg73534

Don't know if I mentioned it there, but Delphi online documentation can help, too:
http://docwiki.embarcadero.com/RADStudio/en/Main_Page, especially the pages under Delphi Reference

Hope this helps,

BigChimp

[Elmug]

Thank you good people,

Please don't think I don't try to find the info before I ask, but the Lazarus Ocean is immense (to me a beginner).

The .dot methods of components is where I wish there were a compendium, or some book just explaining that.

They are the most powerful commands, in a way, specially if one does not know about them much effort has to be afforded.

[felipemdc]

The .dot methods of components is where I wish there were a compendium, or some book just explaining that.

There is a book: http://www.blaisepascal.eu/index.php?actie=./subscribers/lazarusbookinfoEnglish

And also the online reference: http://lazarus-ccr.sourceforge.net/docs/lcl

[User137]

Most of the guides are written for Delphi, and they most of the time work for Lazarus too. Google can easily find example codes for delphi problems.

[Elmug]

Thanks, User 137.

[Martin_fr]

About learning, there are many methods. Google certainly is one, and a good one at that.

Another code way (at least for me) is to simply explore.
In Lazarus the IDE helps you with code completion.

Type Memo1. and ctrl-space, and you see all the methods, finctions, properties.
For memo1, you will find:
  Text
  Lines
  Append
  Clear
  SelectAll
You can find them by scrolling through the list, or with growing knowledge and experience, you will have a hunch to look for certain word (start typing them).

At this time it will of course be useful, if you know basic pascal. The IDE shows you that "Clear" is a procedure, but "Lines"a property (of type TStrings). So you know that you can search for more under lines.

The same way you will find that Memo1.Lines.Count is a function, and can not be assigned....

Best of all, all the source is there, so you can even jump to a method, and see what t does, or in case of a property, jump to it's declaration, and then jump to the declaration of TStrings.

---
Btw, not directly related, but if you have not yet read the following page, read it:
http://wiki.lazarus.freepascal.org/Lazarus_IDE_Tools

[Elmug]

About learning, there are many methods. Google certainly is one, and a good one at that.

Another code way (at least for me) is to simply explore.
In Lazarus the IDE helps you with code completion.

Type Memo1. and ctrl-space, and you see all the methods, finctions, properties.
For memo1, you will find:
  Text
  Lines
  Append
  Clear
  SelectAll
You can find them by scrolling through the list, or with growing knowledge and experience, you will have a hunch to look for certain word (start typing them).

At this time it will of course be useful, if you know basic pascal. The IDE shows you that "Clear" is a procedure, but "Lines"a property (of type TStrings). So you know that you can search for more under lines.

The same way you will find that Memo1.Lines.Count is a function, and can not be assigned....

Best of all, all the source is there, so you can even jump to a method, and see what t does, or in case of a property, jump to it's declaration, and then jump to the declaration of TStrings.

---
Btw, not directly related, but if you have not yet read the following page, read it:
http://wiki.lazarus.freepascal.org/Lazarus_IDE_Tools

Thank you, Martin!

I've heard about this, but your explanation is excellent and I will start trying it shortly.

I do investigate a lot on the web. Have already hundreds of links in folders and subfolders. I even got a book from Marco Cantu on Delphi-7 but he jumps all over me.

There's nothing like need that motivates the learning, that's why I have a major project going on for quite a while, and has been the basis of most questions you all great people have helped me with.