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AccessViolationException on GetTextFromImage - AccessViolationException from OcrApi method
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Allan  
#1 Posted : Wednesday, July 12, 2017 4:05:19 AM(UTC)
Allan

Rank: Newbie

Groups: Registered
Joined: 7/12/2017(UTC)
Posts: 3
Hi,

I wanted to try out your software, before buying a license, for a project. However I encounter a problem that seems to be out of my hands.

When executing GetTextFromImage with a path to a simple tiff file, a starting point and a size of the area to scan, I get an AccessViolationException.

For testing I made a simple forms project, with just a single button that's hardcoded for a specific file.

Code:

private void button1_Click(object sender, EventArgs e)
{
            Bitmap test = new Bitmap(Path.Combine(@"C:\ScannedDocuments\", "image_0_back.tif"));

            var ocr = OcrApi.Create();

            ocr.Init(Patagames.Ocr.Enums.Languages.English);
            try
            {
                string str = ocr.GetTextFromImage(Path.Combine(@"C:\ScannedDocuments\", "image_0_back.tif"), new Point(95, 160), new Size(320, 30));
                
                button1.Name = str;
            }
            catch (AccessViolationException ex)
            {
                throw new Exception(ex.Message);
            }
}


If you could supply a solution or an idea to why this is happening, I would appreciate it alot!

Regards,
Allan Larsen
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Paul Rayman  
#2 Posted : Friday, July 14, 2017 4:54:46 PM(UTC)
Paul Rayman

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Since I can't reproduce it could you please create a sample app that reproduces your problem? Thanks.
did you setup your project like described here https://tesseract.patagames.com/help/

Edited by user Friday, July 14, 2017 4:57:32 PM(UTC)  | Reason: Not specified
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Allan  
#3 Posted : Tuesday, July 18, 2017 3:35:37 AM(UTC)
Allan

Rank: Newbie

Groups: Registered
Joined: 7/12/2017(UTC)
Posts: 3
I followed every step of that guide, yes.

I couldn't post the test project I made (The dialogue got stuck)

Codesnippet:

Code:
static void Main(string[] args)
        {
            OcrApi.PathToEngine = @"C:\Users\abl\Documents\visual studio 2017\Projects\OCR_Test\OCR_Test\x64\tesseract.dll";
            var ocr = OcrApi.Create();

            ocr.Init(Patagames.Ocr.Enums.Languages.English);

            FileInfo file = new FileInfo("image_0_back.tif");
            var test = new Bitmap(Image.FromFile(@"C:\Users\abl\Documents\visual studio 2017\Projects\OCR_Test\OCR_Test\image_1_back.jpg"));

            try
            {
                string str = ocr.GetTextFromImage(test, new Point(95, 160), new Size(320, 30));

                if (string.IsNullOrEmpty(str))
                    throw new Exception("Blah!");
            }
            catch (AccessViolationException ex)
            {
                throw new Exception(ex.Message);
            }
        }


I've attached the image I'm doing this with to this post. Otherwise it's basic. I get the corrupted memory exception from this.
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Allan  
#4 Posted : Tuesday, July 18, 2017 3:36:39 AM(UTC)
Allan

Rank: Newbie

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Joined: 7/12/2017(UTC)
Posts: 3
image_1_back.jpg (127kb) downloaded 30 time(s). - Here's the picture!
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Paul Rayman  
#5 Posted : Sunday, July 23, 2017 5:45:04 PM(UTC)
Paul Rayman

Rank: Administration

Groups: Administrators
Joined: 1/5/2016(UTC)
Posts: 1,138

Thanks: 10 times
Was thanked: 133 time(s) in 130 post(s)
there is a some bug was found.
I hope it will be fixed in the next release.

Currently I can suggest a following workaround

Code:

using (var pix = OcrPix.FromFile(@"D:\3\image_1_back.jpg"))
{
	string str = ocr.GetTextFromImage(pix, new Point(95, 160), new Size(320, 30));
	if (string.IsNullOrEmpty(str))
		throw new Exception("Blah!");
	Console.WriteLine(str);
}



Fixed!
​https://forum.patagames.com/posts/t431-Version-1-14-341-was-released-on-Feb-08--2018

Edited by user Thursday, February 8, 2018 2:06:32 AM(UTC)  | Reason: Not specified
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