JPEG to pdf leaks (whereas PNG does not)

[S. Mas]

Good evening everybody,

I'm new to this forum and I'm trying to develop an application generating a PDF file from photo taken by the user. My problem is that when I draw a JPEG image in the PDF context, it works, but leaks, which does not if I use a PNG Image.

For sample, the following call leaks :

UIImage * destImage = [UIImage imageNamed:@"Image.JPG"];
[destImage drawInRect:drawingFrame];

whereas this one does not :

UIImage * destImage = [UIImage imageNamed:@"Image.png"];
[destImage drawInRect:drawingFrame];

I don't undestand ???

Thanks in advance

[BrianSlick]

How are you determining that it leaks?

Post the complete code from that method.

[S. Mas]

Good evening,

I use the Leaks instrument to identify the leak.

Here is a small test method which shows the problem.
Even if in both cases (JPG/PNG), the pdf file is correctly generated with the image in it, the leak only appears with the JPG version.

- (IBAction) run{

	// Using local pool for autorelease objects
	NSAutoreleasePool * localpool = [[NSAutoreleasePool alloc] init];
	
	// Creating the file path
	NSArray *documentsPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
	NSString * pdfFilePath = [[documentsPaths objectAtIndex:0] stringByAppendingPathComponent:@"MyFile.pdf"];
		
	// Creating PDF File and context
	UIGraphicsBeginPDFContextToFile(pdfFilePath, CGRectZero, nil);
		
	// New page
	CGRect pageRect = CGRectMake(0, 0, 612, 792);
	UIGraphicsBeginPDFPageWithInfo(pageRect, nil);
	
	// Image choice
	
	// JPEG -> Leak (Responsible caller : GImageReadCreateDataWithMappedFile)
	UIImage * destImage = [UIImage imageNamed:@"Image.jpg"];
	
	// PNG -> No leak
	//UIImage * destImage = [UIImage imageNamed:@"Image.png"];
	
	// Image drawing
	CGFloat width = 200;
	CGFloat height = 200 * destImage.size.height / destImage.size.width;
	CGRect drawingFrame = CGRectMake(10, 10, width, height);
	[destImage drawInRect:drawingFrame];
	
	
	// PDF Context closing / File writing
	UIGraphicsEndPDFContext();
	
	// Releasing local pool
	[localpool release];
	
}

[2five7]

Creates UIImage file from a PDF page of a PDF document & stores the image in the iPad Library.-

-(IBAction)pdf2image
{	
	// m_webView is a UIWebView
	UIGraphicsBeginImageContext(m_webView.frame.size); 
	CGContextRef context = UIGraphicsGetCurrentContext();
	CGContextTranslateCTM(context, 0.0, m_webView.frame.size.height);
	CGContextScaleCTM(context, 1.0, -1.0);

	// The file DemoPDF.pdf is in the Resource Folder of the Project
	CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), CFSTR("DemoPDF.pdf"), NULL, NULL); 
	CGPDFDocumentRef document = CGPDFDocumentCreateWithURL(pdfURL);

	// m_pnTf is the UITextField which is used to enter the desired page number
	int pageNumber = [m_pnTf.text intValue]; 
	CGPDFPageRef pdfPage = CGPDFDocumentGetPage(document, pageNumber);
	CGContextDrawPDFPage(context, pdfPage);
	UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

	// The final image is saved in the iPad Library
	UIImageWriteToSavedPhotosAlbum(img, nil, nil, nil); 
}

[S. Mas]

What about image2pdf ?