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Index › Programming Questions & Help › Syntax Questions › external file control
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external file control? (Read 1000 times)
SethT
external file control?
Oct 22nd, 2009, 5:36pm  
this seems like a pretty straightforward question; I just can't find anything about it on the site.

Is there any way for processing to delete files or folders?
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starkes
Re: external file control?
Reply #1 - Oct 22nd, 2009, 7:07pm  
I was messing around with the java exec command a while ago...
You can probably modify this to do what you want:

Code:
import java.io.IOException;
import java.io.*;

void setup()
{
  background(0);
  size(500,500);
  textFont(createFont("FFScala", 12));
  try
  {
    String cm = "cmd.exe /C dir /W C:\\mp3";

    Process p = Runtime.getRuntime().exec(cm);
    InputStream in = p.getInputStream();
    int ch;
    StringBuffer sb = new StringBuffer(512);

    while ( ( ch = in.read() ) != -1 )
    {	
      sb.append((char) ch); 
    }

    println(sb.toString());
    String splitString[] = split(sb.toString(), "\n");
    splitString = trim(splitString);
    int numStrings = 0;
    for(int i = 0; i < splitString.length; i++)
    {
      if(splitString[i].indexOf(".mp3")>=0)
      {
        numStrings++; 
      }
    }
    String[] pngFilesFound = new String[numStrings];
    numStrings=0;
    for(int i = 0; i < splitString.length; i++)
    {
      if(splitString[i].indexOf(".mp3")>=0)
      {
        pngFilesFound[numStrings]=splitString[i];
        text(pngFilesFound[numStrings], 10, numStrings*15+50);
        numStrings++; 
      }
    }
    saveStrings("file.txt",splitString);
    saveStrings("mp3s.txt",pngFilesFound);
    println("Number of processors: " + Runtime.getRuntime().availableProcessors());
    println("free memory: " + (Runtime.getRuntime().freeMemory()/1024)/1024 + "MB");
    println("max memory: " + (Runtime.getRuntime().maxMemory()/1024)/1024 + "MB");
    println("total memory: " + (Runtime.getRuntime().totalMemory()/1024)/1024 + "MB");
  }
  catch(IOException e)
  {
  }
}

void keyPressed()
{
  if(key == ' ')
  {
    exit();
  } 
}

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PhiLho 
Re: external file control?
Reply #2 - Oct 23rd, 2009, 1:26am  
Look at Java's File class.
Should be something like:
Code:
File fileToDelete = new File(pathOfFileToDelete);
fileToDelete.delete();

starkes' method should be avoided, as it is non portable (OK for a quick sketch to run for you, not to share).
starkes, File also provides list() and listFiles() methods.
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starkes
Re: external file control?
Reply #3 - Oct 23rd, 2009, 10:11am  
mmm good to know.
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