broken pipe error while Capturing image in android

Question

I am going to capture an image which is from an application in android, but there is some problem with Output Stream and there is an error with BROKEN PIPE with JAVA.IO. My code if below. Here is the problem with the write command function. I have downloaded this demo from git hub, so please help me as soon as possible. Thanks a lot in advance.

void takeScreenshot()
{
    String file ="/data/data/com.koushikdutta.screenshot/screenshot.bmp";;
    OutputStream os = null;
    int screenshotUid;
    String screenshotUser = null;
    Process sh = null;
    try
    {
        try
        {
            sh = Runtime.getRuntime().exec("su -c sh");

            os = sh.getOutputStream();
            Log.e("","THE VALUE OF OBJECT IS:::::"+os.toString());

            // file ="/data/data/com.koushikdutta.screenshot/screenshot.bmp";
            screenshotUid = getUidForPackage("com.koushikdutta.screenshot");
            screenshotUser = getUserForPackage("com.koushikdutta.screenshot");
        }
        catch(Exception e)
        {
            Log.e("","Hi Error created");
        }
        try
        {
            Thread.sleep(2000);
            writeCommand(os, "rm "+file);
            writeCommand(os, "mkdir /sdcard/dcim");

        }
        catch(Exception e)
        {
            Log.e("","Hello How are you??"+e.getMessage());
        }
        writeCommand(os, "mkdir /sdcard/dcim/Screenshot");
        writeCommand(os, "/data/data/com.koushikdutta.screenshot/screenshot");
        writeCommand(os, "chown root." + screenshotUser + " " + file);
        writeCommand(os, "chmod 660 " + file);
        writeCommand(os, "exit");
        os.flush();
        os.close(); 
        boolean success = false;
        for (int i = 0; i < 10; i++)
        {
            try
            {
                Thread.sleep(1000);
                // if we can successfully get the exit value, 
                // then that means the process exited.
                sh.exitValue();
                success = true;
                break;
            }
            catch (Exception ex)
            {
                Log.e("","Error while"+ex.getMessage());
            }
        }
        try
        {
            if (!success)
                throw new Exception("Unable to take screenshot");

            File screenshot = new File(file);
            if (!screenshot.exists())
                throw new Exception("screenshot.raw file not found!");

            mHander.post(new Runnable()
            {
                public void run()
                {
                    Toast toast = Toast.makeText(
                        ScreenshotActivity.this, 
                        "Screen captured!", Toast.LENGTH_LONG);
                    toast.show();
                }
            });
        }
        catch(Exception e)
        {
            Log.e("","ERROR CREATING......."+e.getMessage());
        }

        try
        {
            FileInputStream fs = new FileInputStream(file);
            mBitmap = BitmapFactory.decodeStream(fs);
            mScreenshotFile = String.format(
                        "/sdcard/dcim/Screenshot/screenshot%d.png", 
                        System.currentTimeMillis());
            FileOutputStream fout = new FileOutputStream(mScreenshotFile);
            mBitmap.compress(CompressFormat.PNG, 100, fout);
            fout.close();
            mConnection.scanFile(mScreenshotFile, null);
        }
        catch (Exception ex)
        {
            Log.e("","Error while"+ex.getMessage());
        }

        mHander.post(new Runnable()
        {
            public void run()
            {
                mImage.setImageBitmap(mBitmap);
            }
        });
    }
    catch (Exception ex)
    {
        Toast toast = Toast.makeText(
                        ScreenshotActivity.this, "Error: " + ex.getMessage(), 
                        Toast.LENGTH_LONG);
        toast.show();
        Log.e("",""+ "Error: " + ex.getMessage());
    }
}

   static void writeCommand(final OutputStream os, String command) 
   {

       try
    {
        os.write((command+"\n").getBytes("ASCII"));
    }
    catch(Exception e)
    {
        e.printStackTrace();
        Log.e("","Error was::::::::::::::::::"+e.getMessage());
    }

}

Answer 1

I think the process you executed has been terminated, so the OutputStream is not available anymore, so the "Broken Pipe" error.

I would try:

ProcessBuilder builder = new ProcessBuilder("/bin/bash");
builder.redirectErrorStream(true);
Process process = builder.start();

instead of calling directly:

sh = Runtime.getRuntime().exec("su -c sh");

give it a try. Let me know.

Maybe you can get some good ideas from:

Java Process with Input/Output Stream