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POProtected Memory Violation calling FORTRAN DLL from C#
 

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    <p>I am trying to call out to a legacy dll compiled from FORTRAN code. I am new to Interop, but I've read some articles on it and it seems like my case should be fairly straightforward. </p> <p>The method I really want to call has a complex method signature, but I can't even call this simple GetVersion method without getting a protected memory violation.</p> <p>Here's my DllImport code:</p> <pre><code>[DllImport("GeoConvert.dll", EntryPoint="_get_version@4", CallingConvention=CallingConvention.StdCall)] public static extern void GetGeoConvertVersion([MarshalAs(UnmanagedType.LPStr, SizeConst=8)] ref string version); </code></pre> <p>Here's the FORTRAN code:</p> <pre><code>SUBROUTINE GetVer( VRSION ) C !MS$DEFINE MSDLL !MS$IF DEFINED (MSDLL) ENTRY Get_Version (VRSION) !MS$ATTRIBUTES DLLEXPORT,STDCALL :: Get_Version !MS$ATTRIBUTES REFERENCE :: VRSION !MS$ENDIF !MS$UNDEFINE MSDLL C CHARACTER*8 VRSION C VRSION = '1.0a_FhC' C RETURN END </code></pre> <p>Here's my unit test that fails:</p> <pre><code>[Test] public void TestGetVersion() { string version = ""; LatLonUtils.GetGeoConvertVersion(ref version); StringAssert.IsNonEmpty(version); } </code></pre> <p>Here's the error message I get:</p> <pre><code>System.AccessViolationException Message: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. </code></pre> <p>Other things I've tried:</p> <ul> <li>Using the default marshalling</li> <li>Passing a char[] instead of a string (get method signature errors instead)</li> </ul>
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    1. COI'm kind of shocked that you're still using a Microsoft Fortran compiler. (Their last Win32 Fortran compiler was in 1994, was it not?) Most people I know who develop Fortran on Windows are using either DEC / Compaq / HP / Intel Visual Fortran or MinGW-derived gfortran.
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    2. COOn the other hand, if the binary code works, there is no reason to recompile. That's probably a strong disincentive to upgrade.
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      1. USMichael Ratanapintha
 

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