Hi everyone!

  I'm a beginner programmer in C++, and a I'm a new one in this forum. So, pleasure!

  As long I'm doing my first steps, I need to develop a program that will invoke gnuplot, a graphic software. I know I need to do a system call to invoke another program, but I don't know very much about the syntax ... can anyone help me?

  Thanks in advance!

The function system() executes a program.

For example in Windows if the executable is in C:\bin
In Linux/Unix if the executable is in /bin

The string in the argument to system should be the same that you would use from a command line. You can include arguments to the application within the string.

Dave

Hey, I know I'm calling up a pretty old thread, but I have a question.

Can the system() call be used to provide input for the program called with system()?

Just in case you're wondering, I'm trying to write a program that can be used to test another program. arguments are the program to be tested, a file containing test inputs, and a file to put the output.

As was stated earlier, what ever your command line can accept can go into the string passed to the system() call. So if the program you wish to invoke is in /home/me/bin, is named test1, takes an input file name for an argument, and you wish stdout to be written to a file, the string might look like this:

"/home/me/bin/test1 < myinputfile > myoutputfile"

Note that this isn't very flexible if the string were hard-coded: You must recompile if you change any options.

Hi dear, Would anyone like to show me any simple C++ code that executes a gnuplot program?If it is not possible, do you know any information helpful about that?

Thanks so much!