EXC_BAD_ACCESS

[alexprest]

I'm trying to compile your demo using the oldest iOS sdk available nowadays which is 3.2
At runtime, after taking the photograph the program crashes with EXC_BAD_ACCESS during the following call:
char* text = tess->TesseractRect(imageData,(int)bytes_per_pixel,(int)bytes_per_line, 0, 0,(int) imageSize.height,(int) imageSize.width);

Other users are experiencing the same problem, there's a stackoverflow thread about it:
http://stackoverflow.com/questions/4560587/business-card-reader-or-ocr-library-for-iphone-sdk

Have you tried running your code with SDK 3.0 or greater?
Thanks for your precious work!

[leogomes]

Here is how it worked for me:
http://stackoverflow.com/questions/4560587/business-card-reader-or-ocr-library-for-iphone-sdk/5443102#5443102

[nekin]

I did follow your comment at stackoverflow and added [self startTesseract]; to the viewDidLoad() method in OCRDemoViewController but still i am having problem as below.

1. when i take image from camera and click on USE it crashes and shows EXC_BAD_ACCESS
2. if i select picture from gallery then it takes picture and then after coming back to screen of app it just shows picture there as it is. i do not have any idea on how to proceed further from there. OR how can i get data extracted from that image ?

[leogomes]

Nolan has already applied the fix I proposed, so it should work if you just take the code from here: https://github.com/nolanbrown/Tesseract-iPhone-Demo

If you still have problems, try to paste some of your code as a gist, so that we can see concretely how you're doing things.

Cheers,
Leonardo.

[nekin]

Thanks leogomes for your reply.

Yes i have already downloaded code from link which you provided and also i seen that the fix is there. However when i cross check point of crash into app , below is what i find.

My app opens and the moment i select image from camera or from image picker then it goes to resize it and there it is problem
inside resizeimage function i am getting width and height as Zero. I think it should give us the height and width of actual image ..correct ?

I also checked that object coming into resizeimage is not Null.

Waiting for your reply on this.

Thks
Nekin

[leogomes]

I remember there was a problem with the height and width but I can't actually tell what and I don't have my mac here right now.

You could give a try to this: http://tinsuke.wordpress.com/2011/11/01/how-to-compile-and-use-tesseract-3-01-on-ios-sdk-5/

It's more up-to-date and seems to work quite fine from what I've read in the tesseract mailing list.

Cheers,
Leo.

[primsky83]

Guys, in the very first comment of this discussion the code snippet says:
char* text = tess->TesseractRect(imageData,(int)bytes_per_pixel,(int)bytes_per_line, 0, 0,(int) imageSize.height,(int) imageSize.width);

But looking at the official documentation at http://tesseract-ocr.repairfaq.org/classTessBaseAPI.html the TesseractRect method is defined as follows:

static char * TesseractRect (const UINT8 *imagedata, int bytes_per_pixel, int bytes_per_line, int left, int top, int width, int height)

...the width and height parameters are swapped.

As for me, it solved my problem.