Copy of iterator

[Gankov]

I need make copy of iterator. I see that it isn't implemented.
I try implement it like:

public ResultIterator Clone()
{
        return new ResultIterator(Interop.TessApi.ResultIteratorCopy (handle));
}

But it seems not work. When i try call GetText method of coped iterator, application crash. What is wrong?
Thanks for any help.

[charlesw]

Can you please include the error details?

[charlesw]

Also check the standard error output (Console.Error?), I believe this is were tesseract writes most of it's error details to.

[Gankov]

With SharpDevelop i have exception:
System.AccessViolationException: Попытка чтения или записи в защищенную память. Это часто свидетельствует о том, что другая память повреждена.
в Tesseract.Interop.TessApi.ResultIteratorGetUTF8TextInternal(IntPtr handle, PageIteratorLevel level)
в Tesseract.Interop.TessApi.ResultIteratorGetUTF8Text(IntPtr handle, PageIteratorLevel level) в c:\Projects\tesseract-test\Tesseract.Net20\Interop\BaseApi.cs:строка 168
в Tesseract.ResultIterator.GetText(PageIteratorLevel level) в c:\Projects\tesseract-test\Tesseract.Net20\ResultIterator.cs:строка 19
в BaseApiTester.Program.Main(String[] args) в c:\Projects\tesseract-test\BaseApiTester\Program.cs:строка 51

Sorry for Russian words. I don't know how make it on English.

[charlesw]

Hi there the translation is "Attempt to read or write to the protected memory . It is often indicative of the fact that the other memory is corrupted.". I'll have a look this weekend. Is this running the standard BaseApiTester or your implementation of Clone above? If the former would you be able to provide a failing test case in a push request?

[Gankov]

Yes of course.
https://github.com/Gankov/tesseract

[charlesw]

Hi there,
I can confirm your code works fine. The problem turned out to be on tesseract's side. I've filed an a bug report with them (https://code.google.com/p/tesseract-ocr/issues/detail?id=934).

While I have built a copy of tesseract with this fix applied I don't want to add this to our solution since I built it with VS2010, since I don't have VS2008, which would change the VS runtime dependency to 2010 which I'd prefer not to do.

Regards,
Charles

[charlesw]

FYI this will be fixed in the next release of tesseract-ocr. If you need a fix before then you'll need to build tesseract-ocr from it's latest source. I just cannot build it myself at the moment since I don't have VS 2008. I'll leave this issue open till then.