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POSystem.AccessViolationException exception in C# and shell32.dll
 

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  1. POSystem.AccessViolationException exception in C# and shell32.dll
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    <p>i write a snippet code that deletes a specified directory in SHFileOperation method. </p> <p>The SHFileOperation class from a <a href="http://www.pinvoke.net/default.aspx/shell32.shfileoperation" rel="nofollow">pinvoke.net</a></p> <p>the flowing is my test code:</p> <pre><code> var interop = new InteropSHFileOperation(); interop.wFunc = InteropSHFileOperation.FO_Func.FO_DELETE; interop.pFrom = path; interop.fFlags.FOF_SILENT = true; interop.fFlags.FOF_NOERRORUI = true; interop.fFlags.FOF_NOCONFIRMATION = true; return interop.Execute(); </code></pre> <p>the above code can worked in my computer(win7,32-bit,.net 4.0),</p> <p>but when running above code to my other computer(win 2008,64-bit,.net 4.0),i get the flowing error(from windows event viewer):</p> <pre><code>Description: The process was terminated due to an unhandled exception. Exception Info: System.AccessViolationException Stack: at Shopbots.IO.InteropSHFileOperation.SHFileOperation(SHFILEOPSTRUCT ByRef) at Shopbots.IO.InteropSHFileOperation.SHFileOperation(SHFILEOPSTRUCT ByRef) at Shopbots.IO.InteropSHFileOperation.Execute() </code></pre> <p>and from windows exceton dialog</p> <pre><code>event name : APPCRASH Fault Module Name: shell32.dll Fault Module Version: 6.0.6002.18646 Fault Module Timestamp: 4fd23d65 Exception Code: c0000005 </code></pre> <p>[update 2]</p> <p>according "<strong>Don't declare a value for the Pack size. If you omit it, the correct value is used when marshaling and a single SHFILEOPSTRUCT can be used for both 32-bit and 64-bit operation.</strong>" from a other article:<a href="http://www.pinvoke.net/default.aspx/Structures/SHFILEOPSTRUCT.html" rel="nofollow">http://www.pinvoke.net/default.aspx/Structures/SHFILEOPSTRUCT.html</a>:</p> <p>change a SHFILEOPSTRUCT declare that work 32-bit and 64-bit windows operator system(because the InteropSHFileOperation class from pinvoke site that declare a SHFILEOPSTRUCT structure for 32-bit operator system)</p> <pre><code>[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)] struct SHFILEOPSTRUCT { .... } </code></pre>
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    1. CODid you read the comments about the string needing to be double null terminated? http://www.pinvoke.net/default.aspx/shell32.shfileoperation
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      1. POSystem.AccessViolationException exception in C# and shell32.dll
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    2. COyes,i have read.i just noticed this may be the operating system version 32 and 64 issues.i read again and notice about this :The SHFILEOPSTRUCT StructLayout attribute needs a Pack=2 (win32 - see this in the example) and Pack=8 (win64) parameter. Without it, it does not work. Of course both cannot be set for the same struct, so 2 structs are needed.
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    3. CODon't pinvoke this, it is already wrapped by the .NET framework. Use FileSystem.DeleteFile() instead.
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      1. USHans Passant
 

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