Displaying process percentage on DOS screen

Question

Hi,

I am using 7zip in command line mode.

When the operation takes quite a long time, sometimes there is a process percentage displayed.

I wonder if we want to do this using C#/Java, what library to use?

Regards,

Answer 1

no library. You just print to the console System.out.print (not println!), then send backspace characters to clear the line.

System.out("Progress 5");
System.out("\b\b\b\b\b\b\b\b\b\b");
System.out("Progress 10");

I haven't done this in awhile, but that should do it.

Answer 2

You can print a "carriage return", also known as a '\r' to reset the "cursor" to the start of the line.

System.out.printf("Progress: %3d %% \r", percentComplete);

Now every time you print the line, you get sent back to the start so the next percent overwrites the previous one.

Answer 3

You could clear the console for kicks...oh and don't forget string.format has percentage support...

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
          var perc = 0.0;
          while(perc <= 1.0)
          {

            Threading.Thread.Sleep(50); //simulate doing some work

            //EDIT:
            //Console.Clear();
            Console.Write(String.Format("{0:P}\r", perc)); //as per suggestion

            perc += 0.01;
          }
          Console.WriteLine("Press any key to exit");
          var exit = Console.ReadKey();
      }

  }

}