Lex&Yacc + iOS

- (void)processOrcAt:(UIImage *)image {
    [self setOrcImage:image];
    
    tess->Recognize(NULL);
    char *utf8 = tess->GetUTF8Text();
    [self performSelectorOnMainThread:@selector(orcProcessingFinished:)
                           withObject:[NSString stringWithUTF8String:utf8]
                        waitUntilDone:NO];
}
 
- (void)orcProcessingFinished:(NSString *)result
{
  /*  arithmetic *parser = [[arithmetic alloc] init];
    [parser addParseDelegate:self];
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, (unsigned long)NULL), ^(void) {
                [parser parseString:result];
    });*/
    
    [[[UIAlertView alloc] initWithTitle:@""
                                message:[NSString stringWithFormat:@"Recognized:\n%@", result]
                               delegate:nil
                      cancelButtonTitle:nil
                      otherButtonTitles:@"OK", nil] show];
}
 
- (void)setOrcImage:(UIImage *)image {
    free(pixels);
    
    CGSize size = [image size];
    int width = size.width;
    int height = size.height;
    
    if (width <= 0 || height <= 0) {
        return;
    }
    
    // the pixels will be painted to this array
    pixels = (uint32_t *) malloc(width * height * sizeof(uint32_t));
    // clear the pixels so any transparency is preserved
    memset(pixels, 0, width * height * sizeof(uint32_t));
    
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    
    //create a context with rgba pixels
    CGContextRef context = CGBitmapContextCreate(pixels, width, height, 8, width * sizeof(uint32_t), colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedLast);
    
    // paint the bitmap to our context which will fill in the pixels array
    CGContextDrawImage(context, CGRectMake(0, 0, width, height), [image CGImage]);
    
    // we're done with the context and color space
    CGContextRelease(context);
    CGColorSpaceRelease(colorSpace);
   
    tess->SetImage((const unsigned char *) pixels, width, height, sizeof(uint32_t), width * sizeof(uint32_t));
}
#pragma mark -
#pragma mark UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker
        didFinishPickingImage:(UIImage *)image
                  editingInfo:(NSDictionary *)editingInfo
{
    
    [picker dismissModalViewControllerAnimated:YES];
    //UIImage *newImage = [self resizeImage:image];
    self.prHUD = [[MBProgressHUD alloc] initWithView:self.view];
    self.prHUD.labelText = @"loading";
    [self.view addSubview:self.prHUD];
    [self.prHUD showWhileExecuting:@selector(processOrcAt:) onTarget:self withObject:image animated:YES];
   
}