command to file

[charIie]

Hello, I'm working on a small project which would be taking the output of system command and putting them in a user given file. My first attemp I was using fstream for writing to the file. All it was writing was an integer dealing with the success of they system command. After researching Google, I found something that may work. Using popen I believe it is possible. I guess this isn't standard c++ code, so if anyone could elaborate on that or possibly give me an alternative to look into it would be greatly appriciated. So far all the attempts that I have tried with the popen did not work.

Thanks in advance,
charIie

 

[2ffat]

Here is an example from some of my code:

std::ofstream OFile; // stream set up
OFile.open("MyFile.txt");  // name of file open for overwritting
// OFile.open("MyFile.txt", std::ios::app); // Same file for appending

if (!OFile) // Something went wrong
{
    // do something
    cerr << "Could not open MyFile.txt" << std:endl; // for example
}
else // File ready for input
{
    OFile << "Stick something in file" << std::endl;
    OFile << "Variable << I+1 << " OF " << SamplesStr << std::flush; // or you can use variables
}

//Done
OFile.close();

See if that helps.

James P. Cottingham
-----------------------------------------
[sup]I'm number 1,229!
I'm number 1,229![/sup]

 

[charIie]

Ah, yes I have tried a similar code, but it would only write an integer to the file. I need it to be able to take a system() call such as ping 127.0.0.1 and write that output to a file. As far as I know it can't be done normally with the fstreams. If I'm wrong let me know, Thanks

 

[2ffat]

Yes, you can. You can write strings, integers, floats, etc. to a stream, including file streams. As a matter of fact, you can overload the operators to use any custom type you want.

If you only want to output a system call, why not use the redirection (> or >>) command? For example: ping 127.0.0.1 > MyFile.txt to overwrite/create a file or ping 127.0.0.1 >> MyFile.txt to append a file.

James P. Cottingham
-----------------------------------------
[sup]I'm number 1,229!
I'm number 1,229![/sup]

 

[charIie]

Thanks thats what I was looking for.