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Help! Debugger reporting System.IO.FIleLoadException.

I am trying to remote debug a C# application but the debugger is reporting
the following exception:

An unhandled exception of type 'System.IO.FileLoadException' occurred in
Unknown Module.
Additional information: Unverifiable assembly 'FrameGrabber' failed policy
check.

The FrameGrabber assembly is a C++ managed DLL.

I cannot get a stack trace on the exception in the debugger.
I have seen this occur when a C++ managed DLL cannot locate an unmanaged
library
dependency.

The weird thing is that I do not get this exception when I run my
application without the debugger.

I have used the "Depends" tool to check the DLL and found no missing DLLs.
Can someone help me out on what I can
do to locate the cause of this exception?

--
-----------------------------------
Ken Varn
Senior Software Engineer
Diebold Inc.
va***@diebold.com
-----------------------------------
Nov 13 '05 #1
6 7474
Your explanation makes sense, however the twist is that I able to remotely
debug my managed C++ application that uses the same DLL and it does not
produce this exception. What's with that?

--
-----------------------------------
Ken Varn
Senior Software Engineer
Diebold Inc.
va***@diebold.com
-----------------------------------
"Mark Pearce" <ev**@bay.com> wrote in message
news:Od**************@TK2MSFTNGP11.phx.gbl...
Hi Ken,

If you're running (and remote debugging) your app from a local network
share, then I suspect that you're running into a permissions issue. Programs that run on the CLR use something called code access security (CAS), which
assigns trust based upon evidence it can gather from the code itself. This
evidence is then compared against the security policy, and a permission
grant is generated.

Part of the evidence used is the security zone where the code is located.
When you run the code from your local machine, this will be the MyComputer
zone, but when you run it off from a server (or even a server share mapped
to a drive on your machine), it will be LocalIntranet. By
default, any code that is run from the MyComputer zone will get a permission set of FullTrust (un-restricted permission to do anything it pleases).
However, there is a more restrictive policy placed on LocalIntranet
assemblies.

You probably can't get an exception stack trace because it's not your app
that's throwing the exception, it's the CLR.

A temporary method of solving this issue is to simply give the LocalIntranet zone more trust. This can be done in the .NET Framework Configuration
control panel applet. A permanent solution is to modify your security policy to give FullTrust to all assemblies signed with your key.

HTH,

Mark
--
Author of "Comprehensive VB .NET Debugging"
http://www.apress.com/book/bookDisplay.html?bID=128
"Ken Varn" <va***@diebold.com> wrote in message
news:uK**************@TK2MSFTNGP12.phx.gbl...
I am trying to remote debug a C# application but the debugger is reporting
the following exception:

An unhandled exception of type 'System.IO.FileLoadException' occurred in
Unknown Module.
Additional information: Unverifiable assembly 'FrameGrabber' failed policy
check.

The FrameGrabber assembly is a C++ managed DLL.

I cannot get a stack trace on the exception in the debugger.
I have seen this occur when a C++ managed DLL cannot locate an unmanaged
library
dependency.

The weird thing is that I do not get this exception when I run my
application without the debugger.

I have used the "Depends" tool to check the DLL and found no missing DLLs.
Can someone help me out on what I can
do to locate the cause of this exception?

--
-----------------------------------
Ken Varn
Senior Software Engineer
Diebold Inc.
va***@diebold.com
-----------------------------------

Nov 13 '05 #2
Hello Ken,

I think giving the FullTrust permission should solve the problem.

Try caspol -ag 1 -url file://\\Machine1\sharename\* FullTrust

Please test it and post here if the problem still can't be resolved. Thanks.

Best regards,
yhhuang
VS.NET, Visual C++
Microsoft

This posting is provided "AS IS" with no warranties, and confers no rights.
Got .Net? http://www.gotdotnet.com
--------------------
!Reply-To: "Ken Varn" <va***@diebold.com>
!From: "Ken Varn" <va***@diebold.com>
!Subject: Help! Debugger reporting System.IO.FIleLoadException.
!Date: Wed, 9 Jul 2003 16:31:27 -0400
!Lines: 31
!Organization: Diebold Inc.
!X-Priority: 3
!X-MSMail-Priority: Normal
!X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
!X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
!Message-ID: <uK**************@TK2MSFTNGP12.phx.gbl>
!Newsgroups:
microsoft.public.dotnet.languages.csharp,microsoft .public.dotnet.languages.vc,microsoft.public.vsnet .debugging
!NNTP-Posting-Host: 204.151.249.23
!Path: cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTN GP12.phx.gbl
!Xref: cpmsftngxa06.phx.gbl microsoft.public.dotnet.languages.vc:25953 microsoft.public.vsnet.debugging:2754
microsoft.public.dotnet.languages.csharp:168053
!X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
!
!I am trying to remote debug a C# application but the debugger is reporting
!the following exception:
!
!An unhandled exception of type 'System.IO.FileLoadException' occurred in
!Unknown Module.
!Additional information: Unverifiable assembly 'FrameGrabber' failed policy
!check.
!
!The FrameGrabber assembly is a C++ managed DLL.
!
!I cannot get a stack trace on the exception in the debugger.
!I have seen this occur when a C++ managed DLL cannot locate an unmanaged
!library
!dependency.
!
!The weird thing is that I do not get this exception when I run my
!application without the debugger.
!
!I have used the "Depends" tool to check the DLL and found no missing DLLs.
!Can someone help me out on what I can
!do to locate the cause of this exception?
!
!--
!-----------------------------------
!Ken Varn
!Senior Software Engineer
!Diebold Inc.
!va***@diebold.com
!-----------------------------------
!
!
!
Nov 13 '05 #3
Hi Ken,

Sorry, but I know absolutely nothing about managed C++ and how permissions
work in that environment. Are you doing that remote debugging in the same
way, i.e. by launching the remote app from within Visual Studio? Or are you
launching it directly on the remote pc and attaching a debugger, in which
case the permissions issue doesn't apply?

Regards,

Mark
--
Author of "Comprehensive VB .NET Debugging"
http://www.apress.com/book/bookDisplay.html?bID=128
"Ken Varn" <va***@diebold.com> wrote in message
news:#E**************@TK2MSFTNGP12.phx.gbl...
Your explanation makes sense, however the twist is that I able to remotely
debug my managed C++ application that uses the same DLL and it does not
produce this exception. What's with that?

--
-----------------------------------
Ken Varn
Senior Software Engineer
Diebold Inc.
va***@diebold.com
-----------------------------------
"Mark Pearce" <ev**@bay.com> wrote in message
news:Od**************@TK2MSFTNGP11.phx.gbl...
Hi Ken,

If you're running (and remote debugging) your app from a local network
share, then I suspect that you're running into a permissions issue. Programs that run on the CLR use something called code access security (CAS), which
assigns trust based upon evidence it can gather from the code itself. This
evidence is then compared against the security policy, and a permission
grant is generated.

Part of the evidence used is the security zone where the code is located.
When you run the code from your local machine, this will be the MyComputer
zone, but when you run it off from a server (or even a server share mapped
to a drive on your machine), it will be LocalIntranet. By
default, any code that is run from the MyComputer zone will get a permission set of FullTrust (un-restricted permission to do anything it pleases).
However, there is a more restrictive policy placed on LocalIntranet
assemblies.

You probably can't get an exception stack trace because it's not your app
that's throwing the exception, it's the CLR.

A temporary method of solving this issue is to simply give the LocalIntranet zone more trust. This can be done in the .NET Framework Configuration
control panel applet. A permanent solution is to modify your security policy to give FullTrust to all assemblies signed with your key.

HTH,

Mark
--
Author of "Comprehensive VB .NET Debugging"
http://www.apress.com/book/bookDisplay.html?bID=128
"Ken Varn" <va***@diebold.com> wrote in message
news:uK**************@TK2MSFTNGP12.phx.gbl...
I am trying to remote debug a C# application but the debugger is reporting
the following exception:

An unhandled exception of type 'System.IO.FileLoadException' occurred in
Unknown Module.
Additional information: Unverifiable assembly 'FrameGrabber' failed policy
check.

The FrameGrabber assembly is a C++ managed DLL.

I cannot get a stack trace on the exception in the debugger.
I have seen this occur when a C++ managed DLL cannot locate an unmanaged
library
dependency.

The weird thing is that I do not get this exception when I run my
application without the debugger.

I have used the "Depends" tool to check the DLL and found no missing DLLs.
Can someone help me out on what I can
do to locate the cause of this exception?

--
-----------------------------------
Ken Varn
Senior Software Engineer
Diebold Inc.
va***@diebold.com
-----------------------------------


Nov 13 '05 #4
Hi Ken,

Have you tried the suggestion? Thanks.

Best regards,
yhhuang
VS.NET, Visual C++
Microsoft

This posting is provided "AS IS" with no warranties, and confers no rights.
Got .Net? http://www.gotdotnet.com
--------------------
!X-Tomcat-ID: 108270411
!References: <uK**************@TK2MSFTNGP12.phx.gbl>
!MIME-Version: 1.0
!Content-Type: text/plain
!Content-Transfer-Encoding: 7bit
!From: yh*****@online.microsoft.com (Yan-Hong Huang[MSFT])
!Organization: Microsoft
!Date: Fri, 11 Jul 2003 03:20:29 GMT
!Subject: RE: Help! Debugger reporting System.IO.FIleLoadException.
!X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
!Message-ID: <Yp**************@cpmsftngxa06.phx.gbl>
!Newsgroups: microsoft.public.dotnet.languages.csharp
!Lines: 57
!Path: cpmsftngxa06.phx.gbl
!Xref: cpmsftngxa06.phx.gbl microsoft.public.dotnet.languages.csharp:168427
!NNTP-Posting-Host: TOMCATIMPORT2 10.201.218.182
!
!Hello Ken,
!
!I think giving the FullTrust permission should solve the problem.
!
!Try caspol -ag 1 -url file://\\Machine1\sharename\* FullTrust
!
!Please test it and post here if the problem still can't be resolved. Thanks.
!
!Best regards,
!yhhuang
!VS.NET, Visual C++
!Microsoft
!
!This posting is provided "AS IS" with no warranties, and confers no rights.
!Got .Net? http://www.gotdotnet.com
!--------------------
!!Reply-To: "Ken Varn" <va***@diebold.com>
!!From: "Ken Varn" <va***@diebold.com>
!!Subject: Help! Debugger reporting System.IO.FIleLoadException.
!!Date: Wed, 9 Jul 2003 16:31:27 -0400
!!Lines: 31
!!Organization: Diebold Inc.
!!X-Priority: 3
!!X-MSMail-Priority: Normal
!!X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
!!X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
!!Message-ID: <uK**************@TK2MSFTNGP12.phx.gbl>
!!Newsgroups:
!microsoft.public.dotnet.languages.csharp,microsof t.public.dotnet.languages.vc,microsoft.public.vsne t.debugging
!!NNTP-Posting-Host: 204.151.249.23
!!Path: cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTN GP12.phx.gbl
!!Xref: cpmsftngxa06.phx.gbl microsoft.public.dotnet.languages.vc:25953 microsoft.public.vsnet.debugging:2754
!microsoft.public.dotnet.languages.csharp:168053
!!X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
!!
!!I am trying to remote debug a C# application but the debugger is reporting
!!the following exception:
!!
!!An unhandled exception of type 'System.IO.FileLoadException' occurred in
!!Unknown Module.
!!Additional information: Unverifiable assembly 'FrameGrabber' failed policy
!!check.
!!
!!The FrameGrabber assembly is a C++ managed DLL.
!!
!!I cannot get a stack trace on the exception in the debugger.
!!I have seen this occur when a C++ managed DLL cannot locate an unmanaged
!!library
!!dependency.
!!
!!The weird thing is that I do not get this exception when I run my
!!application without the debugger.
!!
!!I have used the "Depends" tool to check the DLL and found no missing DLLs.
!!Can someone help me out on what I can
!!do to locate the cause of this exception?
!!
!!--
!!-----------------------------------
!!Ken Varn
!!Senior Software Engineer
!!Diebold Inc.
!!va***@diebold.com
!!-----------------------------------
!!
!!
!!
!
!
!
Nov 13 '05 #5
I tried to run CASPOL and disabled all .NET security and that seemed to fix
the problem. It seems strange however that the security is so tight for C#,
but not for C++. I have had a whole slew of issues regarding remote
debugging. A lot of other security restrictions are a big pain and I wish
there was an option to bypass all of them with some sort of registry setting
or something.

--
-----------------------------------
Ken Varn
Senior Software Engineer
Diebold Inc.
va***@diebold.com
-----------------------------------
"Mark Pearce" <ev**@bay.com> wrote in message
news:eE****************@TK2MSFTNGP11.phx.gbl...
Hi Ken,

Sorry, but I know absolutely nothing about managed C++ and how permissions
work in that environment. Are you doing that remote debugging in the same
way, i.e. by launching the remote app from within Visual Studio? Or are you launching it directly on the remote pc and attaching a debugger, in which
case the permissions issue doesn't apply?

Regards,

Mark
--
Author of "Comprehensive VB .NET Debugging"
http://www.apress.com/book/bookDisplay.html?bID=128
"Ken Varn" <va***@diebold.com> wrote in message
news:#E**************@TK2MSFTNGP12.phx.gbl...
Your explanation makes sense, however the twist is that I able to remotely
debug my managed C++ application that uses the same DLL and it does not
produce this exception. What's with that?

--
-----------------------------------
Ken Varn
Senior Software Engineer
Diebold Inc.
va***@diebold.com
-----------------------------------
"Mark Pearce" <ev**@bay.com> wrote in message
news:Od**************@TK2MSFTNGP11.phx.gbl...
Hi Ken,

If you're running (and remote debugging) your app from a local network
share, then I suspect that you're running into a permissions issue.

Programs
that run on the CLR use something called code access security (CAS), which assigns trust based upon evidence it can gather from the code itself. This evidence is then compared against the security policy, and a permission
grant is generated.

Part of the evidence used is the security zone where the code is located. When you run the code from your local machine, this will be the MyComputer zone, but when you run it off from a server (or even a server share mapped to a drive on your machine), it will be LocalIntranet. By
default, any code that is run from the MyComputer zone will get a

permission
set of FullTrust (un-restricted permission to do anything it pleases).
However, there is a more restrictive policy placed on LocalIntranet
assemblies.

You probably can't get an exception stack trace because it's not your app that's throwing the exception, it's the CLR.

A temporary method of solving this issue is to simply give the

LocalIntranet
zone more trust. This can be done in the .NET Framework Configuration
control panel applet. A permanent solution is to modify your security

policy
to give FullTrust to all assemblies signed with your key.

HTH,

Mark
--
Author of "Comprehensive VB .NET Debugging"
http://www.apress.com/book/bookDisplay.html?bID=128
"Ken Varn" <va***@diebold.com> wrote in message
news:uK**************@TK2MSFTNGP12.phx.gbl...
I am trying to remote debug a C# application but the debugger is reporting the following exception:

An unhandled exception of type 'System.IO.FileLoadException' occurred in
Unknown Module.
Additional information: Unverifiable assembly 'FrameGrabber' failed policy check.

The FrameGrabber assembly is a C++ managed DLL.

I cannot get a stack trace on the exception in the debugger.
I have seen this occur when a C++ managed DLL cannot locate an unmanaged
library
dependency.

The weird thing is that I do not get this exception when I run my
application without the debugger.

I have used the "Depends" tool to check the DLL and found no missing DLLs. Can someone help me out on what I can
do to locate the cause of this exception?

--
-----------------------------------
Ken Varn
Senior Software Engineer
Diebold Inc.
va***@diebold.com
-----------------------------------


Nov 13 '05 #6
Hi Ken,

Security is really a big topic in .NET programming and we also need to
research much to provide some idea. Bypassing it in registry is not a good
method since a basic idea for .NET is to store info in assembly manifest
instead of registry keys.

Anyway, I am glad that the probem is resolved. If there are any more
questions, please post in the group. Thanks very much.

Best regards,
Yanhong Huang
Microsoft Online Partner Support

Get Secure! C www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

--------------------
!Reply-To: "Ken Varn" <va***@diebold.com>
!From: "Ken Varn" <va***@diebold.com>
!References: <uK**************@TK2MSFTNGP12.phx.gbl>
<Od**************@TK2MSFTNGP11.phx.gbl>
<#E**************@TK2MSFTNGP12.phx.gbl>
<eE**************@TK2MSFTNGP11.phx.gbl>
!Subject: Re: Help! Debugger reporting System.IO.FIleLoadException.
!Date: Mon, 14 Jul 2003 17:03:58 -0400
!Lines: 136
!Organization: Diebold Inc.
!X-Priority: 3
!X-MSMail-Priority: Normal
!X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
!X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
!Message-ID: <eA**************@TK2MSFTNGP11.phx.gbl>
!Newsgroups:
microsoft.public.dotnet.languages.csharp,microsoft .public.dotnet.languages.v
c,microsoft.public.vsnet.debugging
!NNTP-Posting-Host: 204.151.249.23
!Path: cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTN GP11.phx.gbl
!Xref: cpmsftngxa06.phx.gbl microsoft.public.dotnet.languages.vc:26143
microsoft.public.vsnet.debugging:2811
microsoft.public.dotnet.languages.csharp:169046
!X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
!
!I tried to run CASPOL and disabled all .NET security and that seemed to fix
!the problem. It seems strange however that the security is so tight for
C#,
!but not for C++. I have had a whole slew of issues regarding remote
!debugging. A lot of other security restrictions are a big pain and I wish
!there was an option to bypass all of them with some sort of registry
setting
!or something.
!
!--
!-----------------------------------
!Ken Varn
!Senior Software Engineer
!Diebold Inc.
!va***@diebold.com
!-----------------------------------
!"Mark Pearce" <ev**@bay.com> wrote in message
!news:eE****************@TK2MSFTNGP11.phx.gbl...
!> Hi Ken,
!>
!> Sorry, but I know absolutely nothing about managed C++ and how
permissions
!> work in that environment. Are you doing that remote debugging in the same
!> way, i.e. by launching the remote app from within Visual Studio? Or are
!you
!> launching it directly on the remote pc and attaching a debugger, in which
!> case the permissions issue doesn't apply?
!>
!> Regards,
!>
!> Mark
!> --
!> Author of "Comprehensive VB .NET Debugging"
!> http://www.apress.com/book/bookDisplay.html?bID=128
!>
!>
!> "Ken Varn" <va***@diebold.com> wrote in message
!> news:#E**************@TK2MSFTNGP12.phx.gbl...
!> Your explanation makes sense, however the twist is that I able to
remotely
!> debug my managed C++ application that uses the same DLL and it does not
!> produce this exception. What's with that?
!>
!>
!>
!> --
!> -----------------------------------
!> Ken Varn
!> Senior Software Engineer
!> Diebold Inc.
!> va***@diebold.com
!> -----------------------------------
!> "Mark Pearce" <ev**@bay.com> wrote in message
!> news:Od**************@TK2MSFTNGP11.phx.gbl...
!> > Hi Ken,
!> >
!> > If you're running (and remote debugging) your app from a local network
!> > share, then I suspect that you're running into a permissions issue.
!> Programs
!> > that run on the CLR use something called code access security (CAS),
!which
!> > assigns trust based upon evidence it can gather from the code itself.
!This
!> > evidence is then compared against the security policy, and a permission
!> > grant is generated.
!> >
!> > Part of the evidence used is the security zone where the code is
!located.
!> > When you run the code from your local machine, this will be the
!MyComputer
!> > zone, but when you run it off from a server (or even a server share
!mapped
!> > to a drive on your machine), it will be LocalIntranet. By
!> > default, any code that is run from the MyComputer zone will get a
!> permission
!> > set of FullTrust (un-restricted permission to do anything it pleases).
!> > However, there is a more restrictive policy placed on LocalIntranet
!> > assemblies.
!> >
!> > You probably can't get an exception stack trace because it's not your
!app
!> > that's throwing the exception, it's the CLR.
!> >
!> > A temporary method of solving this issue is to simply give the
!> LocalIntranet
!> > zone more trust. This can be done in the .NET Framework Configuration
!> > control panel applet. A permanent solution is to modify your security
!> policy
!> > to give FullTrust to all assemblies signed with your key.
!> >
!> > HTH,
!> >
!> > Mark
!> > --
!> > Author of "Comprehensive VB .NET Debugging"
!> > http://www.apress.com/book/bookDisplay.html?bID=128
!> >
!> >
!> > "Ken Varn" <va***@diebold.com> wrote in message
!> > news:uK**************@TK2MSFTNGP12.phx.gbl...
!> > I am trying to remote debug a C# application but the debugger is
!reporting
!> > the following exception:
!> >
!> > An unhandled exception of type 'System.IO.FileLoadException' occurred
in
!> > Unknown Module.
!> > Additional information: Unverifiable assembly 'FrameGrabber' failed
!policy
!> > check.
!> >
!> > The FrameGrabber assembly is a C++ managed DLL.
!> >
!> > I cannot get a stack trace on the exception in the debugger.
!> > I have seen this occur when a C++ managed DLL cannot locate an
unmanaged
!> > library
!> > dependency.
!> >
!> > The weird thing is that I do not get this exception when I run my
!> > application without the debugger.
!> >
!> > I have used the "Depends" tool to check the DLL and found no missing
!DLLs.
!> > Can someone help me out on what I can
!> > do to locate the cause of this exception?
!> >
!> > --
!> > -----------------------------------
!> > Ken Varn
!> > Senior Software Engineer
!> > Diebold Inc.
!> > va***@diebold.com
!> > -----------------------------------
!> >
!> >
!> >
!>
!>
!>
!
!
!

Nov 13 '05 #7

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Hi there. I have been struggling to find out how to use a variable as my location in my header redirect function. Here is my code. ...
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by: AndyPSV | last post by:
HOW CAN I CREATE AN AI with an .executable file that would suck all files in the folder and on my computerHOW CAN I CREATE AN AI with an .executable...

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