Save PDF pages as image files

[Jume]

Hi,

I am trying to save each PDF's page as an image file on my mac. I've come up with the Quartz solution, but it's giving me problems.... Here's my code:

NSData *pdfData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://localhost/uniki/unicenter/static/images/cluster/test.pdf"]];
CFDataRef pdfDataRef = (CFDataRef)pdfData;
	
CGImageSourceRef imgSoureRef = CGImageSourceCreateWithData(pdfDataRef, NULL);
NSLog(@"Number of sources: %d", GImageSourceGetCount(imgSoureRef));
	
CGImageRef imgRef = NULL;
CFDictionaryRef dictP = NULL;

if (imgSoureRef) {
	imgRef = CGImageSourceCreateImageAtIndex(imgSoureRef, 0, NULL);
	dictP  = CGImageSourceCopyPropertiesAtIndex(imgSoureRef, 0, NULL);
}

	
NSURL *outPath = [NSURL fileURLWithPath:@"/Users/mac/Desktop/page01.jpg"];
CGImageDestinationRef dest = CGImageDestinationCreateWithURL((CFURLRef)outPath, (CFStringRef)@"public.jpeg" , 1, NULL);
CGImageDestinationAddImage(dest, imgRef, dictP);
CGImageDestinationFinalize(dest);

This are the errors that I'm getting. I tried google on this error but without any success. I really don't understand what are these errors trying to say to me... any help?

2010-02-03 19:29:11.331 UNILoader[6716:a0f] Number of sources: 4
Wed Feb 3 19:29:11 Macintosh-96.local UNILoader[6716] <Error>: CGImageDestinationAddImage image parameter is nil
Wed Feb 3 19:29:11 Macintosh-96.local UNILoader[6716] <Error>: CGImageDestinationFinalize image destination does not have enough images

[harrytheshark]

It's basically telling you that "imgRef" is nil so it can't create an image.

[Jume]

Originally Posted by harrytheshark

It's basically telling you that "imgRef" is nil so it can't create an image.

I knew that but didn't know what was the problem. I found out with the help from people from the Quartz mailing list...

CGImageSourceCreateImageAtIndex should not be used to create CGImageRef from PDF source ... Instead CGImageSourceCreateThumbnailAtIndex should be used. It worked after I used this method, but there are other problems with this.

There is a bug in Apple frameworks by using CGImageSourceCreateThumbnailAtIndex which end up in huge memory leaks. It only happens when source is PDF. I tried PSD source and no leaks, but having leaks with PDF source. I filled a bug report for this issue.

[wingspinner]

Originally Posted by Jume

I

CGImageSourceCreateImageAtIndex should not be used to create CGImageRef from PDF source ... Instead CGImageSourceCreateThumbnailAtIndex should be used. It worked after I used this method, but there are other problems with this.

Yes, but this only works if the PDF has an embedded thumbnail and it only returns an image of the size of the thumbnail. Doesn't do a conversion as I understand it.