I am trying to read a file so that I can average out the numbers listed in the file. I believe my code is correct, but I keep getting an error in Visual Studio stating, "Unable to start program ... The system cannot find the file specified." The file I want to read, "numbers.dat" is in the directory, but it still shows this error.
I'm new to C++ so I was wondering if anyone would be able to help?
Here is my code
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main() {
ifstream myfile;
myfile.open("numbers.dat");
int total = 0, count = 0, num;
while (!myfile.eof()){
myfile>>num;
total += num;
count++;
}
cout<<"The "<<count<<" numbers total "<<total<<" and average "<<total/count<<endl;
myfile.close();
system("pause");
return 0;
}
Spanky is most likely correct, but to provide more information -
Visual Studio compiles your program into a Build Directory. When you run your program through Visual Studio it runs from the Build Directory. By default the Build Directory is not the same folder as your source code, so your program won't find files in that are mixed in with your source code.
Possible solutions:
You can copy the file into your Build Directory
You can change your Build Directory
You can use absolute or relative file paths to point to the correct location
I don't use MSS for development, but it's a usual practice that people miss a thing that a directory, from where the program is launched, and the directory you think the program is launched, are different.
For example, u've got a build directory
d:\project\build,
Compiled binary (.exe) is located in
d:\project\build\debug directory.
Well, your numbers.dat should probably be located in d:\project\build directory and NOT in d:\project\build\debug.
Related
im learning c++ using visual studio as ide. I'm currently doing io streams, but when i try to open a file, the program doesn't open the file.
here is the code -
#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
#include <vector>
int main()
{
std::ifstream file;
file.open("Text.txt");
if (file.is_open())
{
std::cout << "open" << std::endl;
}
else
std::cout << "not open" << std::endl;
}
i get the output as not open.
any help is appreciated, thanks
you need to keep the file in the directory where the executable is generated by default when using Visual Studio. this is typically located in your solution directory under a folder called Debug/Release depending on your configuration. check the project settings to see where the executable will be generated and copy the file there.
I had a similar problem opening the csv file from cpp file and I found a solution by placing my csv file in the same folder where my source files and especially the cpp file(from which I am trying to open it) is placed.
1)Make sure the path you given is correct.
2)Make sure the file you trying to open is already using by other processes.
Make sure the file exists the path given and and try by giving the full path of the file , if it works ,then make your adjustments.
Try to open the file manually and check if their is any problem with the file.
Check your file is protected by read-only or something like that.
Try to work with the below sample code, and reply me what error you are getting.
file reading sample
file writing sample
I'm learning C++ as first programming language and I can't figure out how to run Hello World program. I was googling for solution but I did not find any.
#include <iostream>
using namespace std;
int main() {
cout << "Hello, World!";
return 0;
}
Unable to start program
'C:\Users/thom/Desktop/C++/Visual/firstproject/Debug/Hello World.exe'.
The system cannot find the file specified.
If you create a .cpp file in File > New > File > C++ File?
If so, the path is not included in the project directory, causing the compiler to fail to find the file.
The correct way is to create a cpp file in the project directory under Explorer.As shown below：
You can modify the name of the .cpp, and don't modify the default location.
Now you can try to build and run the executable.
Try Build -> Rebuild Solution, find the executable in the path shown at the output to run it.
You can also try pressing Ctrl+F5 to build and run
Does anyone know why the file isn't opening? I also tried just putting "infile.txt" and placing it in the folder of the program and also the debug folder but the ways I used to check for open error both triggered meaning that it could not open. I know I can hard code the location but I don't want to.
I heard you should do stringobj.c_str() but I don't know if that's accurate?
#include "stdafx.h"
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int main()
{
ifstream infile;
ofstream outfile;
string fileloc = "infile.txt";
infile.open(fileloc);
if (!infile)
{
cout << "open fail 1" << endl;
}
bool fail = infile.fail();
if (fail)
{
cout << "open fail 2";
}
return 0;
}
Note that the directory structure (at least for VS2013) is
<base>
- Solution Directory
- Debug
- Release
- Project Directory
- Debug
- Release
The program by default runs in the project directory (even though it is built to the solution/debug directory).
If you accepted the default naming convention when starting your project, you should be putting your file in the "Projects\ConsoleApplication1\ConsoleApplication1" directory, not "Projects\ConsoleApplication1"
Check your working directory in Project Settings -> Debugging. Make your file available there.
First, the documentation for the signature of
std::ifstream::open( const char * filename, ios_base::openmode mode=ios_base::in)
does indicate it requires a const char *, exactly what std::string::c_str() provides. However, there is an overload for open which accepts a const str &, which means it works the same way for both on most implementations.
Otherwise, what you're grappling with is known as the current working directory (or cwd). Apparently you're not sure where THAT directory is. It may be different while you run the debugger on Visual Studio than it is when you run your program from the command line, and it may be different in various IDE's.
I'm not sure why you want to ensure your program only opens a file by name in the current directory, and not give the full path, but...
You may want to inquire what the current working directory is, so you can solve the mystery wherever you try this. In my Visual Studio 2015, the directory ends up being the directory ABOVE debug, but that depends entirely on how your project is configured, and we can't see that out here.
So, try:
std::string cwd = getcwd( NULL, 0 );
This requires a header <direct.h> on Windows in Visual Studio, but it will give you the directory you're trying to figure out.
with
string fileloc = "infile.txt";
if you put infile.txt in the same folder of the cpp file, it should be fine.
btw I delete your first line
#include "stdafx.h"
I use cygwin console, may have minor diff
For my issue - i was stuck at loading image by opencv - i was wrong to place directory with jpg in the root of the C++ project
WRONG:
CORRECT:
I wrote a small VC++ program using VS2012 and tried to read an text file. I put the file in the release folder. However I cannot read the file until using the absolute file directory. I cannot find useful information online though. The code is like this
#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main()
{
cout<<"Hello World!"<<endl;
string test;
ifstream myfile;
myfile.open("E:\\Glus\\Project2\\Release\\bunny.txt");
if(myfile.is_open())
{
string s0,s1;
int x0, x1;
myfile>>s0>>x0;
cout<<s0<<x0<<endl;
myfile>>s1>>x1;
cout<<s1<<x1<<endl;
}
else
{
cout<<"Error in reading file!"<<endl;
}
myfile.close();
cin>>test;
return 0;
}
Thank you!
The path is not relative to the executable, but to the current directory (see _getcwd).
In case you are launching the application from VC, try
"..\\Release\\bunny.txt"
For a real life application, I'd suggest to detect the path of the executable and use it to construct the path to the data file. It is more reliable and safer.
Visual studio does not save your program exactly where you run it, actually it saves it in your a folder within your project folder with same name of your project
you can get current working path using this command :
system("cd");
it can solve your problem to locate your files.
I keep getting this error with these lines of code:
include <iostream>
int main()
{
cout << "Hello World" >>;
system("pause");
return 0;
}
"The system cannot find the file specified"
The system cannot find the file specified usually means the build failed (which it will for your code as you're missing a # infront of include, you have a stray >> at the end of your cout line and you need std:: infront of cout) but you have the 'run anyway' option checked which means it runs an executable that doesn't exist. Hit F7 to just do a build and make sure it says '0 errors' before you try running it.
Code which builds and runs:
#include <iostream>
int main()
{
std::cout << "Hello World";
system("pause");
return 0;
}
The code should be :
#include <iostream>
using namespace std;
int main() {
cout << "Hello World";
return 0;
}
Or maybe :
#include <iostream>
int main() {
std::cout << "Hello World";
return 0;
}
Just a quick note: I have deleted the system command, because I heard it's not a good practice to use it. (but of course, you can add it for this kind of program)
I had a same problem and this fixed it:
You should add:
C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\Lib\x64 for 64 bit system
C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\Lib for 32 bit system
in Property Manager>Linker>General>Additional Library Directories
Another take on this that hasn't been mentioned here is that, when in debug, the project may build, but it won't run, giving the error message displayed in the question.
If this is the case, another option to look at is the output file versus the target file. These should match.
A quick way to check the output file is to go to the project's property pages, then go to Configuration Properties -> Linker -> General (In VS 2013 - exact path may vary depending on IDE version).
There is an "Output File" setting. If it is not $(OutDir)$(TargetName)$(TargetExt), then you may run into issues.
This is also discussed in more detail here.
This is because you have not compiled it. Click 'Project > compile'. Then, either click 'start debugging', or 'start without debugging'.
I resolved this issue after deleting folder where I was trying to add the file in Visual Studio. Deleted folder from window explorer also. After doing all this, successfully able to add folder and file.
I was getting the error because of two things.
I opened an empty project
I didn't add #include "stdafx.h"
It ran successfully on the win 32 console.