[Boost-users] [Filesystem] Problem with uncatchable exception when checking empty card reader

Subject: [Boost-users] [Filesystem] Problem with uncatchable exception when checking empty card reader
From: Marco Wedekind (Marco.Wedekind_at_[hidden])
Date: 2009-09-14 11:52:27

Hello,

I am using the Filesystem library from boost 1.38.0 on Windows (Visual Studio 2005) like this:

if (boost::filesystem::exists("W:") && boost::filesystem::is_empty("W:"))
{
  ... do something useful ...
}

"W:" is assigned to an (usually) empty card reader slot. Unfortunately Filesystem's exists() function fails with an uncatchable exception. At least I cannot catch it... The exception is thrown by GetFileAttributesA() in operations.hpp:

  inline DWORD get_file_attributes( const char * ph )
    { return ::GetFileAttributesA( ph ); }

The exception pops up an error message that is titled "Windows - no disc" and it says:

Exception Processing Message c0000013 Parameters 75b0bf9c 4 75b0bf9c 75b0bf9c

Sadly, all I can do is to prefix a call to exists() with a call to GetVolumeInformationA() (from winbase.h) like this:

if (GetVolumeInformationA("W:", NULL, NULL, NULL, NULL, NULL, NULL, NULL))
{
  if (boost::filesystem::exists("W:") && boost::filesystem::is_empty("W:"))
  {
    ... do something useful ...
  }
}

Is there any way to do this platform-independent?

I have been searching the docs and the boost website, google and so on, to see if that can already be done with boost Filesystem. Since I did not find anything on this topic, I hope you can put me on the right track.

Cheers,

Marco
 
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