Core API samples

package org.ghost4j.example;

import org.ghost4j.Ghostscript;
import org.ghost4j.GhostscriptException;

/**
 * Example showing how to convert a Postscript file to PDF.
 * @author Gilles Grousset (gi.grousset@gmail.com)
 */
public class PDFConvertExample {

     public static void main(String[] args) {

        //get Ghostscript instance
        Ghostscript gs = Ghostscript.getInstance();

        //prepare Ghostscript interpreter parameters
        //refer to Ghostscript documentation for parameter usage
        String[] gsArgs = new String[10];
        gsArgs[0] = "-ps2pdf";
        gsArgs[1] = "-dNOPAUSE";
        gsArgs[2] = "-dBATCH";
        gsArgs[3] = "-dSAFER";
        gsArgs[4] = "-sDEVICE=pdfwrite";
        gsArgs[5] = "-sOutputFile=output.pdf";
        gsArgs[6] = "-c";
        gsArgs[7] = ".setpdfwrite";
        gsArgs[8] = "-f";
        gsArgs[9] = "input.ps";

        //execute and exit interpreter
        try {

            gs.initialize(gsArgs);
            gs.exit();

        } catch (GhostscriptException e) {
            System.out.println("ERROR: " + e.getMessage());
        }
     }

}

package org.ghost4j.example;

import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

import org.ghost4j.Ghostscript;
import org.ghost4j.GhostscriptException;
import org.ghost4j.display.ImageWriterDisplayCallback;

/**
 * Example showing how to setup a display callback (to interract with the display) for the Ghostscript interpreter.
 * In this example, a simple ImageWriterDisplayCallback is used as callback: it converts page rasters into images and stores them.
 * @author Gilles Grousset (gi.grousset@gmail.com)
 */
public class DisplayCallbackExample {

    public static void main(String[] args) {

        //get Ghostscript instance
        Ghostscript gs = Ghostscript.getInstance();

        //create display callback (capture display output pages as images)
        ImageWriterDisplayCallback displayCallback = new ImageWriterDisplayCallback();

        //set display callback
        gs.setDisplayCallback(displayCallback);

        //prepare Ghostscript interpreter parameters with display device
        String[] gsArgs = new String[7];
        gsArgs[0] = "-dQUIET";
        gsArgs[1] = "-dNOPAUSE";
        gsArgs[2] = "-dBATCH";
        gsArgs[3] = "-dSAFER";
        gsArgs[4] = "-sDEVICE=display";
        gsArgs[5] = "-sDisplayHandle=0";
        gsArgs[6] = "-dDisplayFormat=16#804";

        //run PostScript (also works with PDF) and exit interpreter
        try {

            gs.initialize(gsArgs);
            gs.runFile("input.ps");
            gs.exit();

        } catch (GhostscriptException e) {
            System.out.println("ERROR: " + e.getMessage());
        }

        //write images captured by the display callback to the disk in PNG format
        try {
            for (int i = 0; i < displayCallback.getImages().size(); i++) {
                ImageIO.write((RenderedImage) displayCallback.getImages().get(i), "png", new File((i + 1) + ".png"));
            }
        } catch (IOException e) {
            System.out.println("ERROR: " + e.getMessage());
        }

    }
}