[Insight-users] ITK and managed c++ 2005

Sun Oct 1 18:57:44 EDT 2006

Hi Dan, 
Thank you for such a comprehensive answer, but although all executes
smoothly, this is still a console application and changing the subsystem to
Windows (to prevent the console window from showing up) brings back the old
error again. However you mentioned that you are using a c# application, I
will give it a try then, 

Best, 
Tadeusz

  _____  

From: Dan Mueller [mailto:d.mueller at qut.edu.au] 
Sent: Sunday, October 01, 2006 11:15 PM
To: Tadeusz Dracz
Cc: insight-users at itk.org
Subject: Re: [Insight-users] ITK and managed c++ 2005

Hi Tadeusz,

I am indeed using System.Windows.Forms; however not from a C++ application,
but a C# application. So I think there is definitely some hope!

Okay, let's work this out. I have tried the minimal example you sent me and
can confirm that it does produce the 'System.TypeInitializationException'
you were reporting. I think the issue is with the vcproj file. Are you using
CMake to configure your project? I *highly* recommend using it - in the long
run it will save you heaps of time! CMake can be downloaded from
http://www.cmake.org.

Using CMake allows for all the myriad of compilation and linking options to
be taken care of automatically (almost). Because we are using C++/CLI (ie.
Managed C++ 2005) we need to set some of the options by hand (if anyone out
there knowns how to set the below options actually using CMake I would love
to here from you!). Please find attached a CMake script for configuring your
minimal example. To build the example, follow these steps:

    1. Open CMake and set the source and build paths (usually not the same
place to keep things neat ie. 'out-of-source-build' )
    2. Configure the project, making sure the ITK_DIR is automatically found
(if not you will need to browse to it by hand)
    3. Open the generated solution file
    4. Right-click on the project file and select "Properties".
    5. Navigate to "Configuration Properties > General" and set "Common
Language Runtime support" to on (ie. /clr).
        I have found that just adding the /clr switch as an additional
compilation option using CMake does not work...anyone out there have any
ideas?
        Instead you must change the "ManagedExtensions" property value in
the vcproj file from "0" to "1".
    6. Navigate to "Configuration Properties > C/C++ > Code Generation" and
change "Enable C++ Exceptions" to "Yes With SEH Exceptions" (ie. /EHa)
        We need to do this because the /EHsc switch is not compatiable with
the /clr switch.
        Again I have found that just adding to /EHa switch with CMake does
not work. It seems that /EHsc is deeply entrenched in CMake - I managed to
trace it back to
        CMAKE_CXX_FLAGS_INIT in
share/CMake/Modules/Platform/Windows-cl.cmake...but I can't work out how to
override it with /EHa.
    7. Compile the project!

I have added some more complexity to the minimal example just to make sure
everything is working okay. Using this approach I can instantiate the
ImageFileReader object with no problems.

FYI:  I use a little custom program to 'fix' the output of the CMake project
files. It's not an ideal solution, but it does allow me to use CMake to
manage the compilation and linkage options. I can forward it to you if you
are interested. Again, if anyone on the mailing list knows how to set these
options using native CMake, I'd like to hear from them!

Anyway, hope this helps!

Cheers

Dan

Tadeusz Dracz wrote: 

Hi Dan, 

Do you use managed windows forms C++ application? Because my C++ managed
console applications run ok with ITK. If you do, there would be at least
some hope for me that it is possible.

I have attached the simplest managed windows forms C++ application. I have
removed all additional files and code, to keep it down to minimum. From the
standard settings I have changed from /clr:pure to /clr (Configuration
Properties->General->Common Language Runtime Support), otherwise ITK would
not link.

Before, I have compiled ITK using standard settings (BUILD_SHARED_LIBS is
OFF).

There is a workaround that will make it run. This requires changing:
Linker->System->Subsystem: Not Set
Linker->Advanced->Entry Point: Empty

But this trick causes a console window to appear and this is supposed to be
a Windows Forms application. 
This will look all right in the attached sample, because I have removed the
form creation code, but it does not look pretty in the real application
where both the console window and the form show up.

Best, 
Tadeusz 

  _____  

From: Dan Mueller [mailto:d.mueller at qut.edu.au] 
Sent: Saturday, September 30, 2006 11:14 PM
To: tdracz at o2.pl
Cc: insight-users at itk.org
Subject: Re: [Insight-users] ITK and managed c++ 2005

Hi Tadeusz,

I have been using ITK with C++/CLI with no problems... I have experienced
some "access violation exceptions" similar to yours below - but only when
using a SmartPointer which has gone out of scope and deleted itself.

Can you provide some more information, or perhaps a minimal example which
fails?

Cheers

Dan

tdracz at o2.pl wrote: 

Hello,

I have created a sample C++ managed windows forms application that is

supposed to use ITK.

I have added all includes as in a normal unmanaged c++ project. It compiles

without errors and warnings. 

But when executed, it throws an exception just at the start. Here is the

contents of the Output window:

First-chance exception at 0x7c96cc82 in App.exe: 0xC0000005: Access

violation reading location 0x0d7cebd9.

First-chance exception at 0x781389db (msvcr80.dll) in App.exe: 0xC0000005:

Access violation writing location 0x0d7cebda.

A first chance exception of type 'System.AccessViolationException' occurred

in App.exe

A first chance exception of type

'<CrtImplementationDetails>.ModuleLoadException' occurred in msvcm80.dll

First-chance exception at 0x7c812a5b in App.exe: Microsoft C++ exception:

[rethrow] at memory location 0x00000000..

An unhandled exception of type 'System.TypeInitializationException' occurred

in Unknown Module.

Additional information: The type initializer for '<Module>' threw an

exception.

System.TypeInitializationException' occurred in Unknown Module.

The application contains just these lines that use ITK:

#include "itkImageFileReader.h"

typedef unsigned short PixelType;

const unsigned int Dimension = 3;

typedef itk::Image< PixelType, Dimension > ImageType;

Is there anybody that could help in this matter?

Regards, 

Tadeusz

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  _____  

using namespace System;

#include "itkImageFileReader.h"

[STAThreadAttribute]

int main(array<System::String ^> ^args)

{

	return 0;

}

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