iPhone: CGPDFPageRef & CGPDFPageRelease memory leak and cryptic error message
- by carloe
Could someone tell me why the code below outputs "missing or invalid MediaBox" in the console? The code works fine if I remove CGPDFPageRelease(page);, but then my app starts leaking like crazy.
-(CGSize)dimensionOfPageAtIndex:(int)index {
CGPDFPageRef page = CGPDFDocumentGetPage(pdf, index);
CGRect tempRect = CGPDFPageGetBoxRect(page, kCGPDFBleedBox);
CGSize tempSize = CGSizeMake(tempRect.size.width, tempRect.size.height);
CGPDFPageRelease(page);
return tempSize;
}
I also have this code in my app, and releasing the pageref here works just fine...
-(UIImage *)pageAtIndex:(NSInteger)pageNumber withWidth:(CGFloat)width andHeight:(CGFloat)height {
if((pageNumber>0) && (pageNumber<=pageCount)) {
CGFloat scaleRatio; // multiplier by which the PDF Page will be scaled
UIGraphicsBeginImageContext(CGSizeMake(width, height));
CGContextRef context = UIGraphicsGetCurrentContext();
CGPDFPageRef page = CGPDFDocumentGetPage(pdf, pageNumber);
CGRect pageRect = CGPDFPageGetBoxRect(page, kCGPDFBleedBox);
//Figure out the orientation of the PDF page and set the scaleRatio accordingly
if(pageRect.size.width/pageRect.size.height < 1.0) {
scaleRatio = height/pageRect.size.height;
}
else {
scaleRatio = width/pageRect.size.width;
}
//Calculate the offset to center the image
CGFloat xOffset = 0.0;
CGFloat yOffset = height;
if(pageRect.size.width*scaleRatio<width) {
xOffset = (width/2)-(pageRect.size.width*scaleRatio/2);
}
else {
yOffset = height-((height/2)-(pageRect.size.height*scaleRatio/2));
}
CGContextTranslateCTM(context, xOffset, yOffset);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextSaveGState(context);
CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFBleedBox, CGRectMake(0, 0, pageRect.size.width, pageRect.size.height), 0, true);
pdfTransform = CGAffineTransformScale(pdfTransform, scaleRatio, scaleRatio);
CGContextConcatCTM(context, pdfTransform);
CGContextDrawPDFPage(context, page);
CGContextRestoreGState(context);
UIImage *tempImage = UIGraphicsGetImageFromCurrentImageContext();
CGContextRelease(context);
CGPDFPageRelease(page);
return tempImage;
}
return NO;
}
