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BOOK: Beginning Visual Basic 2005 ISBN: 978-0-7645-7401-6
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Old February 7th, 2007, 02:13 PM
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Default Security Error on the "Try It Out" from p.113

When compiling and testing (Start debugging) the "Try It Out" for Ch 4 on pg. 113 I get the following errors:

Error from compiling:
A first chance exception of type 'System.Security.SecurityException' occurred in mscorlib.dll

Error from clicking on button:
! SecurityException was unhandled
Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

I tried the suggested ACTION of granting the project permission, but alas it was to no avail.

I've pasted the exception detail below my sig.

I'm running VS 05 with SP1 and all the latest updates (incl IE 7) XP Pro SP2 also with the latest updates.

NOTE: My project is running off a network drive, I don't know if that makes a dif?

My Code:
    Private Sub btnForEachLoop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnForEachLoop.Click

        'List each folder at the root of your C drive using a For Each...Next Loop
        For Each strFolder As String In My.Computer.FileSystem.GetDirectories("C:\")
            'Add the directory to the list

    End Sub


Exception Detail Noted Below:
System.Security.SecurityException was unhandled
  Message="Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed."
       at System.Security.CodeAccessSecurityEngine.Check(Obj ect demand, StackCrawlMark& stackMark, Boolean isPermSet)
       at System.Security.CodeAccessPermission.Demand()
       at System.IO.Path.GetFullPath(String path)
       at Microsoft.VisualBasic.FileIO.FileSystem.FindFilesO rDirectories(FileOrDirectory FileOrDirectory, String directory, SearchOption searchType, String[] wildcards, Collection`1 Results)
       at Microsoft.VisualBasic.MyServices.FileSystemProxy.G etDirectories(String directory)
       at Loops.Form1.btnForEachLoop_Click(Object sender, EventArgs e)
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventAr gs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchM essageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager. System.Windows.Forms.UnsafeNativeMethods.IMsoCompo nentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.Run MessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.Run MessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(ApplicationCo ntext context)
       at Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.Run(String[] commandLine)
       at Loops.My.MyApplication.Main(String[] Args)
       at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.Run UsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context( Object state)
       at System.Threading.ExecutionContext.runTryCode(Objec t userData)
       at System.Runtime.CompilerServices.RuntimeHelpers.Exe cuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
       at System.Threading.ExecutionContext.RunInternal(Exec utionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ExecutionContext.Run(ExecutionCon text executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
Old February 7th, 2007, 03:05 PM
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OK OK! I get it, do ALL my testing BEFORE posting ;-D

I dragged my exe file out of the debug folder on my network drive onto my desktop and it worked fine, so the issue must have been the fact it was running from the network drive, something to note for future projects.

Now the question is how does an end user grant an application with my.computer access permission to run when the app is on a network server (itra or internet)?

I'm probably getting way ahead of myself here, but I have already done a good chunk of Access programming and anticipate getting up to speed on VB for VS 05 quickly, and security is an important issue. Maybe someone can recommend a good VB security book/site etc..


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