Trying to debug a program in Scilab, I inserted a couple
of "print" instructions to track what is going on.
At first, I used the %io(2) output "file" which, according
to the Help, stands for the console. Nothing happened.
Then I used an actual filename:
print("C:\Leszek\Xprmnt\scl\Ovsjanko\K3ScilabLog.txt", "START! \n \n \n \n GOING \n")
which does print to that file, but when the dust has settled
and I want to inspect the file what I find inside is just the last
message (just before the program crashed), even though there should
have been others before it, including the "START" etc in the quote above.
Apparently, every print command reopens the file for writing as a clean slate,
overwriting whatever was in it before. Looking into Help and online docs
I didn't find any options or parameters that I could use to change this.
What I want is, obviously, the output from all my print commands since the
beginning of the program, either on the console or in a text file.
TIA.
Just use disp("some text") or mprintf("format",var1,...,varn), both will display on the console. If you need to write in a file use fd = mopen("file.txt") then mfprint(fd,"format",var1,...,varn).
Related
I am trying to code a little console chat-program in C on linux.
So far I coded it in a way that both chatting partners are only able to alternately send/recv, because these function calls are blocking by default.
Now I would like to modify that program, so that both are able to send and receive simultaneously.
The problem that I find is, that once you typed some input to the terminal, I don't know how to output received messages, without messing up the current input line of the terminal.
If there was a way to delete that current input line, you could temporarily save that line, print the new message and put the input line right back.
However, I was not able to find a solution for this problem on the internet.
Is it possible to delete the current input line, and if not, how else could I achieve what I want?
I think you should look into ncurses as Edd said in his comment.
It would allow you to easily manage contents in your terminal window, which sounds like a good idea for your chat program.
All you'd need to do is store your messages in 2 character arrays:
char incoming[MSG_MAX]
and
char outgoing[MSG_MAX]
Then you can output those messages wherever you want in your terminal window, since ncurses allows you to specify x,y coordinates on where to put your text.
Then a simple wrapper for one of ncurses erase() family functions would allow you to delete characters from specify x,y coordinates in your terminal window.
Edit: MSG_MAX is not an actual ncurses macro.
would like to get some help on a c project i am currently working on. I have a string/array of output to the terminal, but somehow the standard terminal is too small for my output. Even after i manually expand the window of the console the output is still cut off, instead of printing in a single line, it just gets cut off and go to the next row automatically.
hope to get help.
I think that the only way to correct this is by splitting your one-line output in multiple lines, using "\n" at the end of every line.
By doing this you can control when and where it has to write in the next line, and you can make it look more like you wanted to.
I am looking for a way to seek to a beginning of stdout. The reason I want to do that is because I am writing a program and i want to constantly display a status(idle, working, done) while writing other output on stdout.
I tried using fseek and lseek but with no success. I also tried using \r and \b in printf when printing but that also didn't work for me.
For example, the output i want to have would be something like this:
[Idle] Waiting for file...
And when the file is received i want it to change the output to:
[Working] Getting contents of the file...
And when that job is complete to change it to:
[Idle] Waiting for file...
[Done] Saved contents from a file...
And when the next file appears change the status to Working and afterwards change it back to Idle and print out a Done message.
Thanks in advance
I am searching for a highly stable way to feed text (output of a program) into vim through vimserver. Assume that I have started a (g)vim session with gvim --servername vim myfile. The file myfile contains a (unique) line OUT: which marks the position where the text should be pasted. I can straight forwardly achieve this from the commandline with vim --servername vim --remote-send ':%s/OUT:/TEXT\\rOUT:/<Enter>'. I can repeatedly feed more text using the same command. Inside a C-program I can execute it with system(). However TEXT which is dynamic and arbitrary (received as a stream in the C-program) needs to be passed on the command line and hence it needs to be escaped. Furthermore using the replacement command %s vim will jump to the position where TEXT is inserted. I would like to find a way to paste large chunks of arbitrary text seamlessly in vim. An idea is to have vim read from a posix pipe with :r pipe and to write the the string from within the C-program to the pipe. Ideally the solution would be such that I can continuously edit the same file manually without noting that output is added at OUT: as long as this location is outside the visible area.
The purpose of this text feed is to create a command line based front end for scripting languages. The blocks of input is entered manually by the user in a vim buffer and is being sent to the interpreter through a pipe using vim's :! [interpreter] command. The [interpreter] can of course write the output to stdout (preceded by the original lines of input) in which case the input line is replaced by input and output (to be distinguished using some leading key characters for instance). However commands might take a long time to produce the actual output while the user might want to continue editing the file. Therefore my idea is to have [interpreter] return OUT: immediately and to append subsequent lines of output in this place as they become available using vimserver. However the output must be inserted in a way which does not disturb or corrupt the edits possibly made by the user at the same time.
EDIT
The proposed solutions seem to work.
However there seem to be at least two caveats: * if I send text two or more times this way the `` part of the commands will not take me back to the original cursor position (if I do it just once still the markers are modified which may interrupt the user editing the file manually) * if the user opens a different buffer (e.g. the online help) the commands will fail (or maybe insert the text in the present buffer)
Any ideas?
EDIT: After actually trying, this should work for you:
vim --servername vim --remote-send \
":set cpo+=C<CR>/OUT:<CR>:i<CR>HELLO<CR>WORLD<CR>.<CR>\`\`"
As far as I can see, the only caveats would be the period on a single line, which would terminate :insert instead of being inserted, and <..> sequences that might be interpreted as keypresses. Also, need to replace any newlines in the text with <CR>. However, you have no worries about regular expressions getting muddled, the input is not the command line, the amount of escaping necessary is minimal, and the jumping is compensated for with the double backticks.
Check out :help 'cpoptions', :help :insert, and :help ''.
Instead of dealing with the escaping, I would rather use lower-level functions. Use let lnum = search('^OUT:$') to locate the marker line, and call setline(lnum, [text, 'OUT:']) to insert the text and the marker line again.
I'm having a variable called username and another one called password...
I need to register users into a system, and write it on a file..
My problem is, that the 2nd time or more, it writes the details on the same line..
For example :
in the first time I write for the file, it become something like this :
Amit 123456
but on the second time I'm registering a user, it doesnt go to the next line and keep writing from that spot:
Amit 123456Yosi 125818
where I need the file to be like this :
Amit 123456
Yosi 125818
I mean, I need to make the 2nd or more fprintf to the file go to the next line, and not to start from the specific place...
I've wrote this in the code :
fprintf(file, "%s %s\n", username, password);
though, the '\n'doesnt seems to make the next fprintf go to the next line...
In summery - I need to print to the file every time, on a new line..
on the first print to the file, it'll write on line 1
then on the second print to the file, it'll write on line 2, and not from the continue of line1...
Thanks :)
Had the same thought as the commenters: You may need a \r in there too, depending on your development environment. It could even be that the file viewer you are using is the issue (eg: Notepad.exe on Windows often has trouble with simple line endings)
I'm guessing you're on Windows, you need /r/n
Note that it is very, very bad practice to save passwords, please google how to work with passwords.