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POHow can I check if a directory can be renamed in VB.NET?
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  1. POHow can I check if a directory can be renamed in VB.NET?
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    copied!<p>My thought is to use CreateFile from kernel32 and check for sharing violations. I believe this will work because I watched the file system activity with Process Monitor while issuing a rename command from CMD that I knew would fail and the last activity was a failed CreateFile call that resulted in a sharing violation.</p> <p>This is the Process Monitor information on the call.</p> <pre><code>Desired Access: Read Attributes, Delete, Synchronize Disposition: Open Options: Synchronous IO Non-Alert, Open Reparse Point Attributes: n/a ShareMode: Read, Write, Delete AllocationSize: n/a </code></pre> <p>Using this VB code, I produced a call which gave the same information in Process Monitor but did not cause the sharing violation.</p> <pre><code>CreateFile(theDirectoryPath, _ FILE_READ_ATTRIBUTES Or DELETE Or SYNCHRONIZE, _ FILE_SHARE_READ Or FILE_SHARE_WRITE Or FILE_SHARE_DELETE, _ Nothing, _ OPEN_EXISTING, _ FILE_ATTRIBUTE_DIRECTORY Or FILE_FLAG_BACKUP_SEMANTICS _ Or FILE_FLAG_OPEN_REPARSE_POINT, _ Nothing) </code></pre> <p>The constants are pulled from various <a href="http://msdn.microsoft.com/en-us/library/aa363858%28VS.85%29.aspx" rel="nofollow noreferrer">MSDN</a> and <a href="http://www.pinvoke.net/default.aspx/kernel32.CreateFile" rel="nofollow noreferrer">pinvoke.net</a> sources.</p> <p>If I call the above code recursively on all subfolders it will eventually cause the sharing violation, but when CMD refused to rename, it did not recurse. </p> <p><strong>Yes, I know I could just try and catch the exception.</strong> But the point at which I want to know if the directory can be renamed and the point at which I want to rename the directory are not the same.</p> <p><strong>EDIT:</strong></p> <p>There may have been a source of confusion in this question. I am not concerned with permissions; I am concerned with file locks.</p>
 

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