System.AccessViolationException running debugger

  • Thread starter Thread starter V&G
  • Start date Start date
V

V&G

Hello all!

Sometimes, not consistently, focus change cause the WinForm
application, running in debug mode, to throw following exception:
==================================================
"System.AccessViolationException: Attempted to read or write protected
memory. This is often an indication that other memory is corrupt.
at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
at System.Windows.Forms.ToolTip.WndProc(Message& msg)
at System.Windows.Forms.ToolTip.ToolTipNativeWindow.WndProc(Message&
m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG&
msg)
at
System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32
reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at MqPlus.Gui.FrmMain.Main() in
C:\Projects\MqPlus\MqPlus\FrmMain.cs:line 352"
==================================================

The scenario is: run application (F5), switch to other application
(Alt+Tab), switch vice versa
to application.
There is no unsafe code in application. There is no COM/COM+/or other
not .NET libraries usage.

Do someone have idea what may cause such exception?

Thanks ahead
 
Can you provide more of the source code for review? For Example the
portion of the application.run???
Are you doing some multithreaded operation there???
 
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