I am trying to make a program on Windows 10 using Visual Studio 2015 that would sim-link certain files to certain locations. I am trying to make a text file with the location of the files, and the sim-link destination to use.
This is an example of the file data that would be in the properties.txt file:
FileLocation: "Z:\Folder\file.txt"
FileMkdirLocation: "Z:\Folder2\file.txt"
I want to use something like system(mkdir "sim-link_file_location" "file_location") by changing the data that is in properties.txt. I want to be able to add more than 1 file, without recompiling the program and writing each command for each file, one by one.
The problem is that I don't know how to make the commands use the data in the file.
EDIT: I managed to find out a way, but I get errors when compiling the program. I use this code:
#include <iostream>
#include <fstream>
#include <string.h>
#include <stdlib.h>
using namespace std;
//initialization of Properties File used
ifstream PropertiesFile ("PropertiesFile.txt");
int main()
{
//initialization of variables used
int input_option;
char FileLocation[256], Command[]="mklink ";
// string FileLocation, Command;
PropertiesFile >> FileLocation;
/* switch (input_option)
{
case "add all mods":
}
*/
cout << "FileLocation: " << FileLocation;
cout << endl;
strcat(Command, FileLocation);
Command[strlen(FileLocation)] = '\0';
cout << Command;
cout << endl;
//system(command);
system("pause");
return 0;
}
I know that i haven't used all variables yet.
It tells me that "strcat" is deprecated and to use "strcat_s" instead, and when i replace it with that, I get
"Debug Assertion Failed - Expression: (L"Buffer is too small" && 0)"
I had to make the "Command" char bigger than "FileLocation" because then strcat_s would not be able to copy the content. After that the program worked fine, and there were no other Assert Errors.
The command to create a soft link in linux is: ln -s <source> <destination>
You can use this in a system(""); call, BUT before you continue in your code, you will have to make sure that the kernel finished executing this command.
After that you can read the link as if it was the original file.
Related
Recently I want to enhance CMD in Win10 by myself using C++. I don't want to change the original framework of it but to translate the command. At first i wrote something like this:
#include <unistd.h>
#include <iostream>
#include <string>
using namespace std;
int main()
{
string initial = "retr0# ";
string s;
while(1)
{
cout << initial;
getline(cin,s);
if(s!="exit")
{
system(s.c_str());
cout << "------" << endl;
}
else break;
}
system("pause");
return 0;
}
But I found that if you entered command like "E:" or something else to change the directory, it is impossible for the new thread to inherit the context. My question is, how to solve the problem like this?
In most operating systems (including 1970 era Unix), the working directory is specific to each process.
The system function will run another process. So even if you change its working directory, it only affects the process started by system, not the process running your program.
So you need to define a syntax (perhaps the same cd as Windows CMD has) and parse and implement that command in your own program. You could use SetCurrentDirectory or _chdir
I'm really struggling at the moment, originally had other issues with eclipse itself, that seems to have been resolved. Code looks right to me (compared to example code for loading files) however I'm not able to load anything as the error I put in is always triggered. No building errors atm. What am I doing wrong? Tried with both eclipse (mac) and Code::blocks (win vm), both seem to be having issues. the data files themselves are in the same folder as the .cpp file.
#include <iostream>
#include <string>
#include <math.h>
#include <fstream>
using namespace std;
int main() {
cout << "Choose which data file to load (1-4)" << endl;
int file;
cin >> file;
ifstream data;
switch (file) {
case 1:
data.open("dataSet1.txt");
case 2:
data.open("dataSet2.txt");
case 3:
data.open("dataSet3.txt");
case 4:
data.open("dataSet4.txt");
}
if (!data) {
cerr << "File not Loaded" << endl;
return -1;
}
string FullData[61];
for (int i=0; i=60; i++){
data >> FullData[i];
cout << FullData[i] << endl;
}
return 0;
}
EDIT: Got the program to stop showing the error, and it seems to be loading the files, however my assign/display loop doesn't seem to be working now as it displays only the last data point over and over again.
the data files themselves are in the same folder as the .cpp file
Being in the same folder as the .cpp is not important, the dataset files should be in the same folder as the compiled binary program.
It can also be that there is a working directory setting that does not point on the directory where your dataset files are. All that is being passed into the open member function is a string which means that interpreting what that string means depends on the environment settings.
Same issue. In my case as #Gluk36 pointed, the problem was the working directory settings.
In that case, you must deselect "Use default settings" and set where the binary is. I attach you a screenshot for your reference from eclipse CDT 4.9 under linux.
You must have break statement after each case
like:
case1://something;
break;
and you must close the stream with close() function
data.close();
I've looked up similar posts here, but none seem to be doing the job for my question. I'm basically trying take a sequence of words in a .txt file and put each word in a vector, and printing each value afterwards. For example, we have I love racing cars in array.txt, and I want my vector to have "I" at position 0, "love" at 1 and so on. Unfortunately, the code does not access "array.txt", so it never executes the code in the if condition.
Now I've heard that by using the fstream library it should work just fine, but the file is never found. I suspect that it doesn't work because it cannot find the path, but I have never opened files in C++. Also, I have not put my file anywhere in my project folder.
Some changes I've already tried:
file.open("array.txt");
omitting file.close();
include "C:\array.txt"; (with the # in front)
file.open("C:\array.txt")
And I'm using Windows 10, if this matters.
#include <iostream>;
#include <string>;
#include <vector>;
#include <fstream>;
//#include <"C:\Users\Samer El-Hage\Documents">;
using namespace std;
void main(){
vector<string> v (10);
ifstream file;
file.open("C:\array.txt", ios::in);
if (file.is_open())
{
for (int i = 0; i < 3; i++)
{
file >> v[i];
}
file.close();
}
else cout << "Could not access file.";
for (int i = 0; i < 3; i++)
{
cout << v[i] << " ";
}
}
This code prints "Could not access file."
The file cannot be opened because the file system can't find the file named "[Bell]rray.txt". the character sequence '\a' is the "Make my computer Beep" character.
Use either forward slashes: "C:/array.txt", an escaped backslash: "C:\\array.txt" or a raw string literal: R"(C:\array.txt)"
The file must also exist at the specified location. If you do not provide a drive and just say "array.txt" the location defaults to wherever the executable is (or in an IDE, the Working Directory).
Also, you have unnecessary semi-colons after your includes. (In fact, in a Treat Warnings as Errors setup, this won't compile!)
I got it! I had not put the .txt file in my folder with the source code, which, strangely enough, was not mentioned in my previous search results... I got to search better!
\a simply turns the computer beep on. Try writing "C:\\array.txt" instead in the open call.
Try not calling open explicitly:
ifstream file ("array.txt");
Look at the examples here:1
I have this code to create a file, when I run it with CLion it prints out to the console but does not create file, how can I fix this? thanks
#include <iostream>
#include <fstream>
using namespace std;
int main() {
ofstream log_file;
log_file.open("sample23.txt");
if (log_file.is_open())
std::cout << "Open";
log_file << "stuff" << endl;
log_file.close();
return 0;
}
The file may be created into another directory (the working directory).
You can find that location (and change it if needed) as indicated here:
How do I change the working directory for my program
make sure to flush before closing because file is empty
try this out
ofstream f;
f.open( "sample.txt", ios::out );
f << flush;
f.close();
3 things here:
1.) In order to output to another file, you must make another variable like this:
ifstream someoutputfile;
someoutputfile.open("filename");
2.) you actually must make another variable to be "placeholder" of sorts that will automatically assign the first thing your file finds and assigns that to. This may depend on what datatype (int, double, string etc) your input file consists of. Instead of:
log_file << "stuff" << endl;
you can do something like this...
// if my input file is integers for instance..
int data = 0;
log_file >> data;
This can also work for if your file contains multiple data types.
ex:
// if I have two different data types...
string somebody;
int data = 0;
log_file >> data >> somebody;
3.) to output your file data to the screen, just follow a similar way as the example in #1.
someoutputfile << data << somebody << endl;
in addition, dont forget to close the data of BOTH your input and output files:
someoutputfile.close()
Hope that helps in some way :)
I am writing a c++ oct-file that I would like to use as a link between my c++ code and scripts that were written in Octave. I can build and execute with no problems, and as long as I am doing simple things, it seems to work. I can even call functions in a script file with feval()! I just can't seem to figure out how to execute an entire script file..
If I try this simple program, I get an error, but I'm not sure why
#include <octave/oct.h>
#include <octave/octave.h>
#include <octave/parse.h>
#include <octave/toplev.h> // for do_octave_atexit
#include <iostream>
#include <string>
using namespace std;
void runscript(const string &file) {
cout << "attempting to run: " << file << endl;
int parse_status = 0;
eval_string(file, false, parse_status);
cout << "parse_status: " << parse_status << endl;
eval_string(file, false, parse_status, 0); // I'm not sure what the difference here is or
// what the value 0 means, I can't find any documentation on
// what `hargout` is.. See Note {1} below
cout << "parse_status: " << parse_status << endl;
}
int main(int argc, char **argv) {
// Set-up
char *oct_argv[3] = {(char*)"embedded", (char*)"-q", (char*)"--interactive"};
octave_main(3, oct_argv, true);
// Attempt to run script
runscript("Script1");
runscript("Script1.m");
// `a` should be defined after running Script1.m..
octave_value_list a = get_top_level_value("a", false);
do_octave_atexit ();
return 0;
}
Script1.m is very simple and looks like this:
a = 1000;
a
When I run, I always get this output:
attempting to run: Script1
error: invalid call to script /Users/Daly/Documents/School/EECS/Labs/GitHub/deep/Octave/ Script1.m
parse_status: 0
parse_status: 0
attempting to run: Script1.m
parse_status: 0
parse_status: 0
error: get_top_level_value: undefined symbol 'a'
It only ever complains about the invalid call the first time, no matter how many times I try to eval_string or in what order.
Notes: {1} After searching for error: invalid call to script, I found this source code which at line 00155 raises this exact error if nargout isn't 0, so I thought they might be related?
But anyway, maybe this isn't the right way to be going about it. What is the correct way to execute an entire octave script from an octave-embedded c++ program? Thanks!
You should be using the function source_file() rather than eval_string(). Take a look into the parser.h file which unfortunately doesn't have a lot of comments. The names are quite self-explanatory so you shouldn't have a lot of problems.
Also, you're pretty much trying to reimplement Octave's source function. If you really want to implement it again, look into the oct-parse.cc file (generated during the build process with flex and bison).