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POWhat is causing a C++ function called from C# in a unit test (NUnit or MSTest) to produce a different result from the same code run in a console app?
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  1. POWhat is causing a C++ function called from C# in a unit test (NUnit or MSTest) to produce a different result from the same code run in a console app?
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    copied!<p>I'm calling a C++ DLL from C# via P/Invoke using DllImport. The DLL is produced by a third party and is x86 only (so our C# code is built as x86 as well).</p> <p>If I call a certain function on the DLL from a console application, I always get one result which is correct. The function takes a file path and extracts some information from the file.</p> <p>The signature of the function is:</p> <pre><code>private static extern int Function( string str1, int bool1, ref uint outUint1, ref uint outUint2, ref uint outUint3, ref double outDouble1, ref double outDouble2, StringBuilder outStr1); </code></pre> <p>And the unexpected result is in one of the <code>ref uint</code> parameters.</p> <p>If I create a unit test and call the exact same code (with all parameters and such hardcoded), I get an entirely different result, which is incorrect. The incorrect result is always the same. I've tried both MSTest and NUnit tests using various different runners with the same result.</p> <p>Cases producing correct results:</p> <ul> <li>Console app</li> <li>Winforms app</li> <li>Console app running the code but launched from a Unit Test (NUnit)</li> </ul> <p>Cases producing incorrect results:</p> <ul> <li>Test run from Resharper Test Runner (NUnit)</li> <li>Test run from Visual Studio Test Runner (MSTest)</li> <li>Test run from NUnit GUI Test Runner</li> <li>Test run from NUnit Console Test Runner</li> </ul> <p>My test environment is Windows 8 and the C# is built for x86 targeting .NET framework 4.</p> <p>Do any of you have any ideas about what's causing this issue or what I can do to debug it further?</p> <p>I will definitely be attempting to contact the third party that created the DLL, but having a good idea about exactly what's causing this issue would substantially increase the chance of it getting resolved.</p>
 

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