GDI+ Generic Exceptions and AccessViolationException observed when running rendering in multiple threads for a long period of time

Aspose.Cells Product Family
1

Hi,



When running excel rendering on multiple threads, AccessViolationException and Aspose.Cells.CellsException: A generic error occurred in GDI+. might happen



Code:



private static int Main(string[] arguments)

{

//Need to use a licenced version to run Aspose in multiple threads.

RegisterAspose();



CellsHelper.DPI = 96;



Thread thread = new Thread(() => Run(0));

thread.Start();

Thread thread1 = new Thread(() => Run(1));

thread1.Start();

Thread thread2 = new Thread(() => Run(2));

thread2.Start();

Thread thread3 = new Thread(() => Run(3));

thread3.Start();

Thread thread4 = new Thread(() => Run(4));

thread4.Start();

Thread thread5 = new Thread(() => Run(5));

thread5.Start();

Thread thread6 = new Thread(() => Run(6));

thread6.Start();

Thread thread7 = new Thread(() => Run(7));

thread7.Start();



return 0;

}



public static void Run(int index)

{

Assembly executingAssembly = Assembly.GetExecutingAssembly();

string path = Path.GetDirectoryName(executingAssembly.Location);

int i = 1;

while (true)

{

Console.WriteLine(i++);

Thread.Sleep(500);

var book = new Workbook(path + @"\test" + index + “.xlsx”);

Worksheet sheet = book.Worksheets[0];

var options = new ImageOrPrintOptions

{

ImageFormat = ImageFormat.Emf,

OnePagePerSheet = true

};

sheet.PageSetup.PrintArea = “B5:E9”;

SheetRender sr = new SheetRender(sheet, options);

sr.ToImage(0, path + @"\out" + index + “.emf”);

}

}



After running it for a long period of time (1 hour to 12 hours in my record) I can see the process crashed with one of the errors:



Aspose.Cells.CellsException: A generic error occurred in GDI+.

at .(Int32 , Stream , ImageOrPrintOptions )

at .(Int32 , ImageOrPrintOptions , Stream )

at .(Int32 , String , ImageOrPrintOptions )

at Aspose.Cells.Rendering.SheetRender.ToImage(Int32 pageIndex, String fileName)



Or



Unhandled Exception: System.AccessViolationException: Attempted to read or write protected memory. This is ofen an idication that other memory is corrupt.

at System.Drawing.SafeNativeMethods.Gdip.GdipGraphicsClear(HanlerRef graphics, Int32 argb)

at System.Drawing.Graphics.Clear(Color color)

at .( , Stream , , ImageOrPrintOptions )

at .(Int32 , Stream , ImageOrPrintOptions )

at .(Int32 , ImageOrPrintOptions , Stream )

at .(Int32 , String , ImageOrPrintOptions )

at Aspose.Cells.Rendering.SheetRender.ToImage(Int32 pageIndex, String fileName)





Could you please look into this?



Thanks

2
Hi,

Thanks for providing us sample files and details.

See the thread for your reference (similar problem occured there too): <a rel="nofollow" href="https://forum.aspose.com/t/91633</a></div><div><br></div><div>Well, there are too many GDI objects being used in ToImage() method. I am afraid, we cannot add a lock for each of them. We think the best way to cope with it is to add a lock to ToImage() method.</div><div><br></div><div>Thank you.</div>