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POclr:oldSyntax prevents ofstream
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copied!<p>I have a fairly old unmanaged C++ program that called managed c# code (vs2003) that I need to convert. (the original c# code was written in .NET1.1, and needed to be recompiled, it was compiled into 4.0) While ultimately I need to have the entire thing re-written, I was hoping to get the original code to run a little longer.</p> <p>I have boiled the issue that I am seeing down into this test case:</p> <p>Using VS2010 I created a new project: "Visual C++ | MFC Application"</p> <p>Using the wizard I then created a dialog based application with all of the default settings. After including the following header in the app class,</p> <pre><code>#include <fstream> </code></pre> <p>in the InitInstance of the new App Class I created a file with the following two lines of code:</p> <pre><code>ofstream xmlstream; xmlstream.open("junk.txt"); </code></pre> <p>When the app runs the dialog creates a new file in both Debug and Release mode</p> <p>However, when I try to enable the c# code by changing the project properties|general|common runtime Support flag to Common Runtime support, old syntax (<code>/clr:oldSyntax</code>) I get the following error. In Debug mode the program runs just fine, and creates a file. In Release mode the program crashes executing the line </p> <pre><code>ofstream xmlstream; </code></pre> <p>with the error: </p> <pre>An unhandled exception of type 'System.AccessViolationException' occurred in Unknown Module.</pre> <p>Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.</p> <p>The only other reference to issues with this type of program suggested setting the properties for "C/C++|Code Generation|Enable C++ Exceptions" to <code>/EHa</code> which I have done.</p> <p>I did check for reference to fstream.h instead of fstream (the old style headers no longer exist in 2010, they did in 2003) however I am using the new ones. Unless there is someting wrong with the syntax of declaring a stream object now, I am not sure what is wrong.</p> <p>Is there another switch that I need to set to make this compile correctly, or am I inherently doing something that does not make sense?</p>

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