proper way with Open Function

Hello,

(defun c:on (/ f txtline)
(if (setq f(open "c:\\my documents\\Drawing.dwg" "r"))
 (progn
(while (setq txtLine(read-line f))
(princ txtLine))
(close f))
(princ "\n Error - File was not opened.")
))

This Program dose not open the file which titled Drawing.dwg .

And what dose it mean read char or line somtimes "w"?

"r" - Reads a file with either read-char or read-line.

Regards,

Tharwat

Look at the help file for 'open' the other modes are clearly explained.

w ~ open for writing

a ~ open for appending

Look at the help file for 'open' the other modes are clearly explained.

 

w ~ open for writing

a ~ open for appending

Lee.

I am getting most of my information from Autocad Help, But nowadays Internet and Forums ,and I could not understand what will function open a drawing to write in?

Plus to append and reading chars for .....????

Thats why I am asking experts ...

Regards.

The 'open' 'read/write line' functions will open a file as a text file. If you wish to manipulate entities in another drawing, use ObjectDBX.

The 'open' 'read/write line' functions will open a file as a text file. If you wish to manipulate entities in another drawing, use ObjectDBX.

So what is the porpose of writing in a drawing or manipulating

with its entities ....?

Do you want to say that manipulating will get entitiy's settings from its dictionay to reuse it in the running Autplisp program....?

And writing will change entity's settings for a specific matter as well... ?

Regards

Tharwat

I don't know what you are talking about.

The 'open' function will open a file as a text file to be read line by line.

Hi

The main issue still pending and not clear to me, I mean what is that thing or these things that will be read by 'open' ... and what's for ...?

Any clarifications.

Tharwat

The 'open' 'read/write line' functions will open a file as a text file. If you wish to manipulate entities in another drawing, use ObjectDBX.

Dear Lee,

What is objectDBX and how it will be useful? and where i can get help?

yours,

Muthu.

Hi

 

The main issue still pending and not clear to me, I mean what is that thing or these things that will be read by 'open' ... and what's for ...?

You can use open to read a files such as txt/csv/xls all being opened in text file format.

Suppose you have an excel file has coordinate data (X, Y & X) and you want to use this data to draw a line using these data

So you use Open and then read these data

Write: You want to save data in an excel file

Am I in right direction Mr. Tharwat

Hasan

Suppose you have an excel file has coordinate data (X, Y & X) and you want to use this data to draw a line using these data

So you use Open and then read these data

 

Write: You want to save data in an excel file

 

Am I in right direction Mr. Tharwat

 

Hasan

Yes, Now you are at the right rail forward.

Thanks for sharing

Yes, Now you are at the right rail forward.

 

Thanks for sharing

:?