Tesseract hOCR iOS

Question

I am learning how to use the Tesseract API and I am interested in the hOCR output function. Currently I am using this code to scan the image.

 Tesseract* tesseract = [[Tesseract alloc] initWithLanguage:@"eng"];
tesseract.delegate = self;
[tesseract setVariableValue:@"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@.-():" forKey:@"tessedit_char_whitelist"];
[tesseract setVariableValue:@"0" forKey:@"tessedit_create_hocr"];

UIImage *image = [UIImage imageNamed:@"card.jpg"];

CGFloat newWidth = 1200;
CGSize newSize = CGSizeMake(newWidth, newWidth);
image = [image resizedImage:newSize interpolationQuality:kCGInterpolationHigh];


[tesseract setImage:image]; //image to check
[tesseract recognize];

 NSLog(@"Here is the text %@", [tesseract recognizedText]);

Everything is compiling fine, but I want to know how to store the .html that is returned by the hOCR function. Can I store it inside of a variable? I need to be able to access this file in my program after it has been generated. Any insight on how to use hOCR on iOS is appreciated.

Answer 1

You are getting an NSString if you proceed as follows.

- (NSString *)getHOCRText {
        char *boxtext = _tesseract->GetHOCRText(0);
        return [NSString stringWithUTF8String:boxtext];
}

Later you can convert this NSString to NSData.

    NSData *xmlData = [xmlString dataUsingEncoding:NSASCIIStringEncoding];

So that you can parse this data using NSXMLParser

        NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:xmlData];

Hope you are aware remaining parsing procedures.