GDI+ generic error when reading barcode from PDF file

[pravinchopade]

Hi,

I am using free Spire.Barcode library.

Problem is, when I am reading barcode from my .pdf file barcodes are read successfully for first time however when reading same file in loop of reading multiple files at a time, I see errors like
- GDI+ generic error
- Parameter is not valid

Please help me to overcome this error. My code is below

using (Stream straem = new FileStream(FileName, FileMode.Open, FileAccess.Read))
{
using (PdfLoadedDocument ldoc = new PdfLoadedDocument(straem, false))
{
for (int i = 0; i < ldoc.Pages.Count; i++)
{
try
{
SizeF pageSize = ldoc.Pages[i].Size;
Bitmap img = ldoc.ExportAsImage(i, new SizeF(pageSize.Width * 3, pageSize.Height * 3), true);
//We are getting error in below function
string[] str = Spire.Barcode.BarcodeScanner.Scan(img, Spire.Barcode.BarCodeType.Code128);
foreach (string item in str)
{
txtProcessed.Text += item + "; ";
}
img.Dispose();
img = null;
}
catch (Exception ex)
{
}
}
}
}

[Jane.Bai]

Hello,

Thanks for your inquiry.
To help us with a better investigation, could you please share your sample pdf and the images generated on your end?

Sincerely,
Jane
E-iceblue support team

[pravinchopade]

Hi,
Thanks for your reply.
I have attached the PDF file and image retrieved from it.
We are processing same file 10 times in a loop to see how this code behaves in a case when we need to process a large number of files.

[Jane.Bai]

Hello,

Thanks for sharing the file.
I have done a test and always got the correct result.
To help us find out the root, could you please try to directly scan the images generated on your side for several times in a loop. If the issue still exists, please share the exception details.

Sincerely,
Jane
E-iceblue support team

[pravinchopade]

We kept all images in one folder and processed with Spire.Barcode;
below is the Sample code which we are processing in a loop.

Code: Select all

 string[] files = Directory.GetFiles(@"C:\Users\Pravin\Desktop\TestFile");
            foreach (string item1 in files)
            {
                try
                {
                    string[] str = Spire.Barcode.BarcodeScanner.Scan(item1, Spire.Barcode.BarCodeType.Code128);
                    foreach (string item in str)
                    {
                        txtProcessed.Text += item + "; ";
                    }
                }
                catch (Exception ex)
                {
                    txtException.Text += ex.Message + ": "+ex.StackTrace+";  ";
                }
            }


While in the process it throws exceptions:
1.
Bitmap region is already locked.
at System.Drawing.Bitmap.LockBits(Rectangle rect, ImageLockMode flags, PixelFormat format, BitmapData bitmapData)
at System.Drawing.Bitmap.LockBits(Rectangle rect, ImageLockMode flags, PixelFormat format)
at sprᝢ.ᜀ(spr᜝ A_0)
at sprᠺ.ᜁ(spr᜝ A_0)
at sprᠺ.ᜀ(spr᜝ A_0)
at spr៻.ᜀ.ᜊ()
at spr៻.ᜀ.ᜡ()
at spr៻.᜝()
at Spire.Barcode.BarcodeScanner.Scan(String fileName, BarCodeType barcodeType)

2.
Out of memory
at System.Drawing.Bitmap..ctor(String filename)
at spr៻..ctor(String A_0, sprᤘ A_1)
at Spire.Barcode.BarcodeScanner.Scan(String fileName, BarCodeType barcodeType)

[Jane.Bai]

Hello,

Thanks for sharing the details.
Strangely, with the same environment, the issue didn't occur on my side and the process only takes around 30% of my mormory. Could you please check your memory occupation when processing？
Looking forward to your reply.

Sincerely,
Jane
E-iceblue support team

[pravinchopade]

Hi,

Thanks for your Reply.
When I'm running my application, it is taking 30+% of CPU usage and Memory usage goes beyond 90%.
And I'm running that code in a loop, 10 times calling the same function.
And in a loop after some stages, it starts throwing Out of Memory Exception.
You can check for above scenario.
It is my guess that it does not release memory for Bitmaps.

[Jane.Bai]

Hello,

Thanks for your response.
We will dig into it and reply you ASAP.

Sincerely,
Jane
E-iceblue support team

[Jane.Bai]

Hello,

Sorry for the late reply.
I have reproduced the issue and referred it to our dev team, once there's any good news, I will let you know.

Sincerely,
Jane
E-iceblue support team

[pravinchopade]

Thanks for the update.
Looking forward to hearing back from you.

[Jane.Bai]

Hello,

Thanks for the reply.
Once there's any progress, I will inform you.

Sincerely,
Jane
E-iceblue support team