Hello, I would like to know if there is any known issues regarding Graphics objects not being disposed properly. I get regular errors (about once a week with 40-50 users) concerning System.Drawing.BufferedGraphicsContext.CreateCompatibleDIB() (last line of the callstack). After looking it up on google I found that this was usualy caused by Graphics object not being disposed properly and Windows unable to create any more handles. We don't create any Graphics objects in the code on our side and I saw several places where CreateGraphics was called in your library. I was wondering if, to your knowledge, there is any known issues concerning this kind of problems.

Thanks in advance,

Julien D

Hello,

We are using the 5.6.1.25501 version of Flowchart.NET and here is the full callstack (it's really not explicit) :

<Entry address="1660824369" function="System.Drawing.BufferedGraphicsContext.CreateCompatibleDIB" module="System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" repeatCount="0" functionOffset="289" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="true" displayInCallstack="true" />
<Entry address="1660823524" function="System.Drawing.BufferedGraphicsContext.CreateBuffer" module="System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" repeatCount="0" functionOffset="132" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="true" displayInCallstack="true" />
<Entry address="1660823209" function="System.Drawing.BufferedGraphicsContext.AllocBuffer" module="System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" repeatCount="0" functionOffset="201" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="true" displayInCallstack="true" />
<Entry address="1660807341" function="System.Drawing.BufferedGraphicsContext.AllocBufferInTempManager" module="System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" repeatCount="0" functionOffset="13" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="true" displayInCallstack="true" />
<Entry address="1660822841" function="System.Drawing.BufferedGraphicsContext.Allocate" module="System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" repeatCount="0" functionOffset="9" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="true" displayInCallstack="true" />
<Entry address="1635094719" function="System.Windows.Forms.Control.WmPaint" module="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" repeatCount="0" functionOffset="199" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="false" displayInCallstack="true" />
<Entry address="93323556" function="System.Windows.Forms.Control.WndProc" module="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" repeatCount="0" functionOffset="884" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="false" displayInCallstack="true" />
<Entry address="93322746" function="System.Windows.Forms.ScrollableControl.WndProc" module="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" repeatCount="0" functionOffset="58" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="false" displayInCallstack="true" />
<Entry address="93322723" function="System.Windows.Forms.ContainerControl.WndProc" module="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" repeatCount="0" functionOffset="19" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="false" displayInCallstack="true" />
<Entry address="93322720" function="System.Windows.Forms.Control+ControlNativeWindow.OnMessage" module="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" repeatCount="0" functionOffset="0" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="false" displayInCallstack="true" />
<Entry address="93322878" function="System.Windows.Forms.Control+ControlNativeWindow.WndProc" module="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" repeatCount="0" functionOffset="142" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="false" displayInCallstack="true" />
<Entry address="1635104589" function="System.Windows.Forms.NativeWindow.Callback" module="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" repeatCount="0" functionOffset="37" sourceFileName="" sourceFileLine="0" lastTouchChangelist="0" includeInMd5="false" displayInCallstack="true" />

And here's the message we get :

System.ComponentModel.Win32Exception: Not enough storage is available to process this command

You are saying that the crash might be caused by Brushes or Bitmaps not being disposed properly ? I will investigate that, thans a lot for the info it is much apprecitated as always.

I think one of the main purposes (apart from serialization) of MindFusion.Drawing.Pens is to avoid having to call Dispose on them. This lets you set them as property values of items without having to keep track if they are still used. Only the System.Drawing.Pens created from the MindFusion.Drawing ones (e.g. when item.Draw runs) must be disposed.

I hope that helps,
Stoyan

Meh !!! Found out my problem (at least I hope so ), Brushes were created and not disposed in the DrawHandles of my class inheriting DiagramNode. Your replies were more than usefull to find out what was wrong im my code and for that sir I salute you !