Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 7 years ago.
Improve this question
I have a little program that I made which allows me to take in some text and sort it and make it look the way I want it to. One of my functions to save the new text file allows the user to input the name of the file using C++.
What I want to do is at the end of the program, I want it to open notepad displaying that new text file. I know you use " system("notepad.exe (txt file)")." But I can't add a string variable in place of the txt file. It requires the name of the text file, but the file name could be anything depending on the user.
Any help or a link to where I can read about it would be great!
Thanks
Assemble the command in a std::string and then use its c_str function to pass to system.
Related
Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 4 years ago.
Improve this question
I'm using Statistica 64 VB. I wrote a function "Public MyFunction()" in FileLibrary.svb (a collection of useful functions) that I want to be called by a function in FileDoStuff.svb (an analysis).
I tried to include FileLibrary.svb like this in FileDoStuff.svb:
'#Language "WWB-COM"
'#Uses "U:\TestSVB\FileLibrary.svb"
This is the result when I run Main() in FileDoStuff, and the result is the same even if I have FileLibrary open in the application.
"Script error in FileDoStuff.svb
Macro/module does not exist."
Statistica is on the E: drive. However, FileLibrary opens a spreadsheet on U: and has no problem with it. I am able to open FileLibrary from Statistica and test it.
Why would it work to open an external spreadsheet but not call an external macro? The FileLibrary is not saved within Statistica, but neither is the analysis in FileDoStuff. What am I doing wrong?
Also, what's the difference between an SVB and an SVX file?
You know what really helps, as I discovered after hours of trying everything?
Try spelling the entire path name and the entire file name correctly, including spaces, etc. And make sure the slashes go the right way, too. (In my real path/file there are spaces.)
As much as I'd like to delete this whole question, I'm leaving it here to remind us all that sometimes the answer is just that simple. Also, I want to draw more people out who are using Statistica VB because I know there will be more questions.
Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 5 years ago.
Improve this question
I'm doing a program where I have to read information from a file and it can be a file with any extension. Do you know any way in C++ to read and display the information from a file different than the .txt extension?
There is actually no real difference that would be made by a file extension, so you can - in theory - open any file you want, for example by using std::ifstream. However, files that are not using a human-readable encoding (like txt/json/... files), you propably want to open it in binary mode (you can specify this to std::ifstream).
However, if you actually want some usefull information of some specific, not human readable file (like for example the dimensions of a images saved as a png file), you need way more detailled code. To read, for example, information from an png file, you have to open it in binary mode using std::ifstream, and then interpret the read bytes yourself to get any usefull information out of it. So you actually have to know how the specific file format you want to read is encoded, and need to have (or to implement yourself) a decoder for that specific file format.
Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 5 years ago.
Improve this question
I am building a program that will randomly select text from a file.
What can I use to hide the file with the text from the user?
Is it possible to build in this text to the executable?
Is it possible to build in this text to the executable?
One way to include a text file as an inlined resource is to modify your textfile a bit and use an #include statement:
Format of the text file:
R"rawtext(
Put all of the text input you want here:
...
)rawtext"
Modification probably could be also done using a little tool that just surrounds the text you want to get inlined with your program at a pre- preprocessing step for compilation:
At a GNU makefile for example:
MySource.cpp: MySource.h MyTextFile.inc
MyTextFile.inc: MyTextFile.txt
sed -e "s/\(.*\)/R'rawtext(\1)rawtext'/" < $< > $#
In your program you can use then:
std::istrstream input(
#include "MyTextFile.inc"
);
And use it with a std::istream like you would do from an externally opened file.
You can read more about raw string literals here.
One good way build an asset file into your c++ executable is to convert it to a header file, which you can include into your source code.
This question has an answer which shows how to use the linux command xxd to convert any arbitrary file into a header file.
script/tool to convert file to C/C++ source code array
If you decide that you need to prevent the more determined user from seeing the text by using tools like hex editors which could view the text inside the executable, you can compress and/or encrypt the file and decrypt it at runtime.
Hope this helps,
James
Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 6 years ago.
Improve this question
Put simply, I have a browser widget I'm using in FLTK Gui toolkit which can be loaded using a file like so.
browser::load("textfile.txt");
The problem is I don't want to create a physical text file, just an invisible one so I can use it as an argument for browser::load above. I plan to use this invisible text file by loading it with the values I'm going to place in my browser....then use it like this.
browser::load("invisible_textfile.txt");
Is it possible to do this in C++?
I have already tried using ifstream::rdbuf() which probably has nothing to do with this. I'm not even sure what to call this so I'm just calling it an invisible textfile for now.
I'm using windows 7 64 bit. MinGW compiler.
Let's say what you want to add is equivalent of text file like this:
One
Two
Three
But you don't want to have the text file. So one piece of code which would do the same thing is this:
const char *lines[] = { "One", "Two", "Three", 0 };
for(int i = 0 ; lines[i] != 0 ; ++i)
browser.add(lines[i]);
Documentation link for that overload of add
Please refine your question, or perhaps ask a new question, if you want more help on how to get lines with your data.
It depends a lot on what browser::load() actually does internally, but let's assume that it will look for your filename and load it.
You probably already know how to read / write a standard file (e.g. http://www.cplusplus.com/doc/tutorial/files/). Now, if you just want to hide the file from the user, you can set OS specific hidden flags (e.g. windows). I'm assuming that's not what you actually want to accomplish here. (You could obviously also create a temporary file that you delete again, but it's not an elegant solution either.)
What you might want to use is a named pipe. Under Linux you can create these with mkfifo and then stream content through those file objects.
The general point is, though, unless the browser API allows you to pass it a complete string holding the text file or a stringstream, you will need a file object.
If your only target system is NTFS, there is a good answer on creating virtual files over here:
How to create a virtual file?
But in the end, you probably want to create an actual file (in your case probably a temporary one, though). I would recommend placing that file into the systems temporary path.
Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 5 months ago.
Improve this question
I'm we're trying to figure out if there would be a way to convert a .txt file to a .pdf file. Here's the catch. This needs to be done behind the scenes, and on the fly. Meaning, with a radio control selected, OnOK would create a .txt file. Behind the scenes, at run time, we would like for the .txt file to be converted to a .pdf file. Ideally we would like this to be done by running an executable in the background. The executable would take input "File.txt" and output "File.pdf". We're using C++ and Visual Studio 6.
Does anyone have any experience on this? Is this possible?
libHaru may do what you want. Demo.
This a2pdf tool will probably do the trick with minimal effort. Just be sure to turn off perl syntax highlighting.
http://perl.jonallen.info/projects/a2pdf
I recommend using this open source library.
Once you have the base for generating PDF documents programmatically, you would still need a method for converting the text to the PDF elements, while keeping the text flow and word wrapping. This article may help. Please pay attention to the DoText(StreamReader sr) function. It takes text and purge it into separate lines within the PDF document, keeping the rendered within the margins.
On of the simpler methods that has worked for 3 decades e.g. more than one quarter of a century is place a postscript header before the text then use ghostscript ps2pdf it is the same method as used by some commercial apps such as acrobat
at its most basic
Copy heading.ps file.txt printfile.ps
GS -sDEVICE=pdfwrite printfile.ps printfile.pdf
Master Example can be seen here
How to modify this plaintext-to-PDF-converting PostScript from 1992 to actually specify a page size?