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AccessViolationException after disposing PdfBitmap - carrot
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carrot  
#1 Posted : Monday, January 21, 2019 1:12:44 AM(UTC)
carrot

Rank: Newbie

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Joined: 12/4/2017(UTC)
Posts: 9
Slovakia
Location: Bratislava
Hello,

I have an issue with disposing PdfBitmap.

It seems to disposing PdfBitmap corrupt memory. On the last line app throws System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.'.
When I remove pdfBitmap dispose (avoiding using), it works.
I'm using 3.11.3.2704 version, but I tried it also on newest version.

Code:
using (var pdfBitmap = new PdfBitmap(width, height, true))
{
	pdfBitmap.FillRect(0, 0, width, height, Color.White);
	this.pdfPage.Render(pdfBitmap, 0, 0, width, height, PageRotate.Normal, RenderFlags.FPDF_LCD_TEXT);

	Bitmap = (Bitmap)pdfBitmap.Image.Clone();
}

// this throws System.AccessViolationException
Bitmap.Save(@"D:\test.jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);


Can you help me with it?

Thank you
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Paul Rayman  
#2 Posted : Monday, January 21, 2019 2:20:09 AM(UTC)
Paul Rayman

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Hi,

Please use

Code:

Bitmap = new Bitmap(pdfBitmap.Image);


instead of Clone().

The System.Drawing.Image.Clone() method creates a new Bitmap object but the pixel data is shared with the original bitmap object. The Bitmap(Image) constructor also creates a new Bitmap object but one that has its own copy of the pixel data.

More details can be found here:
https://stackoverflow.co...one-and-new-bitmapbitmap
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carrot  
#3 Posted : Monday, January 21, 2019 2:47:37 AM(UTC)
carrot

Rank: Newbie

Groups: Registered
Joined: 12/4/2017(UTC)
Posts: 9
Slovakia
Location: Bratislava
Super, it works.
Thank you.
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