Re: [Tutor] getUncPath(mappedDrive)
Tim.
I came across your code while searching for a similar need. Your post was
the best I could find on the subject. Perhaps more importantly, you showed
me that going down the ctypes rabbit hole can be less intimidating than I
assumed. Thanks!
My use case was a little different than the original poster's. I need to
retrieve the network paths for all of the mapped drives that are currently
connected. I chose a different implementation, that seems to work well. I
would appreciate any comments you have on this approach.
BTW, Thank you for the information on your website. Your information and
pointers to GetDriveType() and GetVolumeInformation() helped me a a lot.
Dan
---
import subprocess
def available_network_drives():
net_drives = dict()
for line in subprocess.check_output(['net', 'use']).splitlines():
if line.startswith('OK'):
fields = line.split()
net_drives[fields[1]] = fields[2] # [1] == key, [2] ==
net_path
return net_drives
print available_network_drives()
--
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Re: [Tutor] getUncPath(mappedDrive)
On 29/01/2014 21:58, danz wrote: Tim. I came across your code while searching for a similar need. Your post was the best I could find on the subject. Perhaps more importantly, you showed me that going down the ctypes rabbit hole can be less intimidating than I assumed. Thanks! [The OP appears to be replying via nabble to a tutor thread from about 18 months ago. I was the person doing most of the talking hence the reply to me] My use case was a little different than the original poster's. I need to retrieve the network paths for all of the mapped drives that are currently connected. I chose a different implementation, that seems to work well. I would appreciate any comments you have on this approach. [... snip subprocess NET USE + splitlines ...] It's a perfectly reasonable approach. The usual caveats would apply: that you're at the mercy of layout changes in NET USE and of i18n changes to the OK text. But both of those are low risk and if it works for you and you're in control of your environment, then it's fine. There's something somewhat satisfying in employing the underlying API for what should be a future-proof solution, but parsing stdout is a well-established approach as well. BTW, Thank you for the information on your website. Your information and pointers to GetDriveType() and GetVolumeInformation() helped me a a lot. You're welcome. Glad it was useful. TJG ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] getUncPath(mappedDrive)
On 30/01/2014 11:39, Tim Golden wrote: On 29/01/2014 21:58, danz wrote: Tim. I came across your code while searching for a similar need. Your post was the best I could find on the subject. Perhaps more importantly, you showed me that going down the ctypes rabbit hole can be less intimidating than I assumed. Thanks! [The OP appears to be replying via nabble to a tutor thread from about 18 months ago. I was the person doing most of the talking hence the reply to me] Just by way of an alternative, the code outlined here: http://timgolden.me.uk/python/win32_how_do_i/show_mapped_drives.html will produce the same effect as your parsing of the net use output. TJG ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] getUncPath(mappedDrive)
I apologize to all, but my above code won't work with paths that have embedded spaces. It also turns out that the net use command inserts a carriage-return/line-feed between the Path and Network fields when the last character position of the Path exceeds 80 characters. My above approach seemed simpler, but that's just because I posted it before adequate testing. Unfortunately, in order to make it actually work for all cases, the implementation becomes more complex and begins to look like a kludge. So my recommendation is to use Tim's ctypes approach. -- View this message in context: http://python.6.x6.nabble.com/Tutor-getUncPath-mappedDrive-tp4652304p5045785.html Sent from the Python - tutor mailing list archive at Nabble.com. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] getUncPath(mappedDrive)
On Thu, Jan 30, 2014 at 8:13 AM, danz ze...@yahoo.com wrote: I apologize to all, but my above code won't work with paths that have embedded spaces. It also turns out that the net use command inserts a carriage-return/line-feed between the Path and Network fields when the last character position of the Path exceeds 80 characters. My above approach seemed simpler, but that's just because I posted it before adequate testing. Unfortunately, in order to make it actually work for all cases, the implementation becomes more complex and begins to look like a kludge. So my recommendation is to use Tim's ctypes approach. You could use WMI's Win32_LogicalDisk class [1]. One way is to parse CSV output from wmic.exe [2]: wmic LogicalDisk WHERE DriveType=4 ^ GET DeviceID, ProviderName /format:csv You can parse the output using the csv module. Or use Tim's wmi module [3]: import wmi DRIVE_REMOTE = 4 def available_network_drives(): net_drives = dict() c = wmi.WMI() for drive in c.Win32_LogicalDisk(DriveType=DRIVE_REMOTE): net_drives[drive.DeviceID] = drive.ProviderName return net_drives [1] http://msdn.microsoft.com/en-us/library/aa394173 [2] http://ss64.com/nt/wmic.html [3] http://timgolden.me.uk/python/wmi/index.html ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] getUncPath(mappedDrive)
From: Tim Golden m...@timgolden.me.uk To: Albert-Jan Roskam fo...@yahoo.com Cc: Python Mailing List tutor@python.org Sent: Saturday, March 24, 2012 11:25 PM Subject: Re: [Tutor] getUncPath(mappedDrive) On 24/03/2012 21:29, Albert-Jan Roskam wrote: Thanks! This seems a feasible approach. I have found this Python project that exposes some of the functions of mpr.dll: http://sourceforge.net/projects/wnetconnect/ WNetGetConnection is not among the functions, but the code will help. I have to read up on ctypes.Structure though as I never really understood this. This particular function call doesn't require too much work in fact. Something like the following code -- error-handling mostly omitted -- should do the trick: code import ctypes # # Get the ANSI version of the function from its DLL # WNetGetConnection = ctypes.windll.mpr.WNetGetConnectionA ERROR_MORE_DATA = 234 # # Set up the drive name to map back from # and an empty buffer with zero length. # local_name = Z: length = ctypes.c_long (0) remote_name = ctypes.create_string_buffer () # # Call the function, expecting to receive an ERROR_MORE_DATA # result, which indicates that the buffer is too small and # which populates the length field with the right length. # result = WNetGetConnection ( local_name, remote_name, ctypes.byref (length) ) # # Assuming we did get that error, recreate the buffer and # call again with the supplied length. This isn't strictly # necessary (you could probably get away with hard-coding # 2048 or whatever) but it does save you having to guess. # if result == ERROR_MORE_DATA: remote_name = ctypes.create_string_buffer (length.value) result = WNetGetConnection ( local_name, remote_name, ctypes.byref (length) ) # # If the result of either call was an error, raise an Exception # if result != 0: raise RuntimeError (Error %d % result) print Remote name is, remote_name.value /code TJG Hi Tim, Thank you so much for this! I think this would also be a valuable addition to os.path (where I'd expect it to be). You call WNetGetConnection twice: one time with a 'dummy' string buffer, and one time with a buffer of the exact required length. If I'd run a function getUncPath() on a gazillion paths, wouldn't it be more effcient to hard-code the length to 2048 as you suggest in your comment? Regards, Albert-Jan ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] getUncPath(mappedDrive)
On 25/03/2012 09:12, Albert-Jan Roskam wrote: Thank you so much for this! I think this would also be a valuable addition to os.path (where I'd expect it to be). You call WNetGetConnection twice: one time with a 'dummy' string buffer, and one time with a buffer of the exact required length. If I'd run a function getUncPath() on a gazillion paths, wouldn't it be more effcient to hard-code the length to 2048 as you suggest in your comment? The fail-and-resize-the-buffer dance is fairly common on Windows. The advantage of the technique is that it will cope with any path length. If you hardcode to 2048 (or whatever length) then the time will come when you'll encounter a longer path and then you'll have to rewrite your code with 4096 or 8192 etc. Obviously, if you have control over all the paths you're interested in, and you know that they can't grow beyond MAXLEN characters, then by all means use MAXLEN as the buffer size and shorten your code. In terms of efficiency, I imagine you'd have to run the function on an unusually high number of paths -- and you've only got 26 possible drive letters in the first place -- so it looks to me like a premature optimisation! TJG ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] getUncPath(mappedDrive)
Hi, Is there a function that takes a file path with a mapped drive (z:\blah) and returns the associated UNC path (\\server\share\ding\dang\dong\blah)? I looked in os.path, but it doesn't seem to have this. The link below seems to be a solution (code in the bottom of the page), but I can't install win32com.client in the office :-( Is there any built-in function? http://stackoverflow.com/questions/2244767/python-check-network-map Thanks! Regards, Albert-Jan ~~ All right, but apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, a fresh water system, and public health, what have the Romans ever done for us? ~~ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] getUncPath(mappedDrive)
On 24/03/2012 20:13, Albert-Jan Roskam wrote: Hi, Is there a function that takes a file path with a mapped drive (z:\blah) and returns the associated UNC path (\\server\share\ding\dang\dong\blah)? I looked in os.path, but it doesn't seem to have this. The link below seems to be a solution (code in the bottom of the page), but I can't install win32com.client in the office :-( Is there any built-in function? http://stackoverflow.com/questions/2244767/python-check-network-map There's nothing built-in. The easiest function to emulate through ctypes is probably WNetGetConnection: http://msdn.microsoft.com/en-us/library/windows/desktop/aa385453%28v=vs.85%29.aspx (this is available from pywin32 via the win32wnet package but I assume you can't install that either) TJG ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] getUncPath(mappedDrive)
From: Tim Golden m...@timgolden.me.uk To: Cc: Python Mailing List tutor@python.org Sent: Saturday, March 24, 2012 9:22 PM Subject: Re: [Tutor] getUncPath(mappedDrive) On 24/03/2012 20:13, Albert-Jan Roskam wrote: Hi, Is there a function that takes a file path with a mapped drive (z:\blah) and returns the associated UNC path (\\server\share\ding\dang\dong\blah)? I looked in os.path, but it doesn't seem to have this. The link below seems to be a solution (code in the bottom of the page), but I can't install win32com.client in the office :-( Is there any built-in function? http://stackoverflow.com/questions/2244767/python-check-network-map There's nothing built-in. The easiest function to emulate through ctypes is probably WNetGetConnection: http://msdn.microsoft.com/en-us/library/windows/desktop/aa385453%28v=vs.85%29.aspx (this is available from pywin32 via the win32wnet package but I assume you can't install that either) TJG ___ Hi Tim, Thanks! This seems a feasible approach. I have found this Python project that exposes some of the functions of mpr.dll: http://sourceforge.net/projects/wnetconnect/ WNetGetConnection is not among the functions, but the code will help. I have to read up on ctypes.Structure though as I never really understood this. Cheers, Albert-Jan ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] getUncPath(mappedDrive)
On 24/03/2012 21:29, Albert-Jan Roskam wrote: Thanks! This seems a feasible approach. I have found this Python project that exposes some of the functions of mpr.dll: http://sourceforge.net/projects/wnetconnect/ WNetGetConnection is not among the functions, but the code will help. I have to read up on ctypes.Structure though as I never really understood this. This particular function call doesn't require too much work in fact. Something like the following code -- error-handling mostly omitted -- should do the trick: code import ctypes # # Get the ANSI version of the function from its DLL # WNetGetConnection = ctypes.windll.mpr.WNetGetConnectionA ERROR_MORE_DATA = 234 # # Set up the drive name to map back from # and an empty buffer with zero length. # local_name = Z: length = ctypes.c_long (0) remote_name = ctypes.create_string_buffer () # # Call the function, expecting to receive an ERROR_MORE_DATA # result, which indicates that the buffer is too small and # which populates the length field with the right length. # result = WNetGetConnection ( local_name, remote_name, ctypes.byref (length) ) # # Assuming we did get that error, recreate the buffer and # call again with the supplied length. This isn't strictly # necessary (you could probably get away with hard-coding # 2048 or whatever) but it does save you having to guess. # if result == ERROR_MORE_DATA: remote_name = ctypes.create_string_buffer (length.value) result = WNetGetConnection ( local_name, remote_name, ctypes.byref (length) ) # # If the result of either call was an error, raise an Exception # if result != 0: raise RuntimeError (Error %d % result) print Remote name is, remote_name.value /code TJG ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
