Thanks Andi for your reply.
My scenario is that i need to create presentations out of slides from
various presentations. In a typical case, I create a new presentation and
keep importing slides content to it using
XMLSlideShow.createSlide().importContent. This method works fine in simple
slides, but if i have slides like the second slide in the attached
presentation, I get empty slides.
I tested merging around 8 presentation files with around 450 slides. 100 of
450 slides were empty (25%). These empty slides are not coming from all
presentations. Therefore, it is a serious problem for our application.
I do not think the problem is drawing the slides because i successfully
exported these slides into thumbnails without any problem. Below is the code
to do that?
public class MergeSlideTest {
public static void main(String[] args) {
File srcDir = new File("/usr/home/ameer/ test.pptx
<http://apache-poi.1045710.n5.nabble.com/file/n5717802/test.pptx> slides");
String[] files = {"test.pptx"};
for (String file : files) {
try {
FileInputStream fis = new FileInputStream(new
File(srcDir,file));
XMLSlideShow srcSlideShow = new
XMLSlideShow(fis);
XSLFSlide[] slides = srcSlideShow.getSlides();
XMLSlideShow destSlideShow = new XMLSlideShow();
for (int i = 0; i < slides.length; i++) {
try {
takeSnapshot(slides[i]);
destSlideShow.createSlide().importContent(slides[i]);
} catch (Exception e) {
System.out.println("Problem in
exporting " + (i + 1)
+ " from " +
file);
e.printStackTrace();
}
}
fis.close();
FileOutputStream fos;
try {
fos = new FileOutputStream(new
File("copy-"+file));
destSlideShow.write(fos);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static void takeSnapshot(XSLFSlide slide){
BufferedImage img = new BufferedImage(600, 600,
BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = img.createGraphics();
//clear the drawing area
graphics.setPaint(Color.white);
graphics.fill(new Rectangle2D.Float(0, 0, 600, 600));
try {
//render
slide.draw(graphics);
//save the output
FileOutputStream out = new FileOutputStream(new
File("slide-thumbnail.png"));
javax.imageio.ImageIO.write(img, "png", out);
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
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