I am loading a csv file using QFileDialog and displaying it on a qtableview . This loading process takes a lot of time. How do I indicate to the user that he has to wait till the file is getting loaded using qstatusbar or qprogressbar?
You can find an example of a working QProgressBar here. In the Qt forum, we had a great discussion about how to get it properly working. However, to be able to show the progress you need to know how many lines there are in the file. So far I have not found any other option than to read the whole file and count how many lines are there. This, getting the total number of lines in a file, was discussed in this stackoverflow topic. One option, if you are first generating this file and then reading it, is to add a header telling you how much information is there, then you will be able to do the QProgressDialog part.
I hope it helped!
Related
I am quite new to gtkmm please be soft, I need to read a file contents and display it.
I have referred to this tut https://developer.gnome.org/gtkmm-tutorial/stable/sec-buildapp-opening-files.html.en, but not sure how to tailor these example to my scenario, I am reading Gtk::TextView, GtkWidget. Can someone point to any simple examples to start.
Have a look at this, it's in PHP but understandable https://www.kksou.com/php-gtk2/sample-codes/read-a-text-file-into-GtkTextView.php
Basically I have an image I'm trying to use as a splash screen. I set up the splash screen and even told it the location(":/Nuclear_Vortex_100_About.jpg") but when I run the program, all I see is a general window background "window"(no close box or any of the decoration, just a widget for lack of a better word) and no image on it.
I added the file (along with a bunch of other images I want to later load and use in the app) and they show up in the "Other Files" folder - ok so I figured since they're in the project, that they would be seen as resources if not source or headers. Do I need to add a special section to the PRO file or something in order to use the file? I'm about to just hard code an absolute path just to get it to work but I want a system independent way to get this done. I'm going to be paid for this project and I don't have much experience with the resource system in QT but it wasn't hard in Visual Studio and other C++ environments. As I see the splash screen show up, I know that part is working. The only thing I don't know for sure is that the file is not being found - that is I have not verified by using QFile and checking if it exists - I'll be doing that after I post this as it'll take some time to get a response or 2.
I have been searching for over a day and a half all over google and haven't found anything telling me what I'm doing wrong.
Thank you!
create resource file (.qrc) and add picture in it. It'll appear in resources section of your project. Then you can use it freely in your program.
I am using the rmarkdown with the rshiny for generating word file reports. I am using the R studio-server for development. On executing the rshiny application, it halts due to some error in the one of the rmarkdown.
The error says...
Quitting from lines 11-486 (/home/KS127/dev/shiny_apps/pashiny/inst/shiny/dataframe_source.Rmd)
Quitting from lines NA-486 (/home/KS127/dev/shiny_apps/pashiny/inst/shiny/dataframe_source.Rmd)
It's providing the line numbers which are not useful to identify the root cause. Adding print statements are also not useful as I am generating the word file report, until and unless the complete .Rmd doesn't get successfully executed, I won't be able to see print statements output.
I tried changing the rmarkdown output setting from chunk output inline to chunk output to console as mentioned here as well but it is of no use.
Is there any way to print the .Rmd file print statements or the output to the console or is there any way to debug the .Rmd file?
In addition to my comment above, Abhinandan, I've recently stumbled across a new package, called testrmd.
Although it is new, it seems to work with a number of different test packages and provides a useful front-end for Rmarkdown documents. (I'm certainly going to use it.)
You might want to check it out. Here's the link: https://github.com/ropenscilabs/testrmd.
I hope this helps you.
See My .Rmd file becomes very lengthy. Is that possible split it and source() it's smaller portions from main .Rmd?
That's what I do. -
Split your code chunks in separate files and add them one by one
I am a beginner in visual studio and has only code C and C++ in command line settings.
Currently, I am taking a module(software development) which requires me to come up with an expense tracker - a program which helps user tracks his/her daily expenses. Therefore, at the end of each individual day, or after a user uses finishes the program, we would have to perform data storage to store all the info in one place which we would export it during the next usage.
My constraint include not using any relational database(although i have no idea what it is :( ). Data storage must be done using XML or text files. Following this, I have several questions regarding data storage:
1) If data is stored successfully, do we export it everytime we start the program? And everytime after the user closes the program, we overwrite the existing data file and then store it accordingly?
2) I have heard from some people that using text file may be easier. Searching on the internet and library only provides me with information regarding XML and not text. Would anyone be able to help me with it? Like tutorials link and stuff?
Thank you very much!
File writing/handling works similar to every other buffer in c++.
you can enable file handling using the fstream header. You can create a file, write to it and over-write every time the program is run, or can even create a file the first time the program is run and then append to it every subsequent time the program runs.
Ive only ever done text files, never tried XML, but Im guessing they're similar.
http://www.cplusplus.com/doc/tutorial/files/ should give you everything you need to know.
Your choice of XML vs plain text depends on the kind of data that you'll be storing.
The reason why you'll only find XML libraries on the internet is because XML is a lot more complicated than plain text. If you don't know what XML is or if the data that you're storing isn't very complex, then I would suggest going with plain text.
For example, to track expenses, you might store a file like this:
sandwich 5.00
coffee 2.30
soft drink 1.50
...
It's very easy to read/write lines like this to/from a file in C++.
I am new to c++ and even newer to Qt on Linux.
Can any one give me a general idea of how to display text in a textbrowser in Qt? I can't post my code because of the seative nature of the project I am working on. All I need is a basic understanding of how to do this related to slots and signals.
My application is this: I am taking input from a CSV file, counting the ords and then displaying the number of counted words along with the line of text in an output window.
It works fine in console c++ program. However, when I code it in Qt, it does not work.
Any advise or help would be welcome.
sorry for the bad question I asked earlier.
It turns out it was a configuration issue on my part.