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How to check a string to see that it is a valid file nameI'd like to check a string to see that it is a valid file name.
Is there a Like pattern or RegEx that can do that. 1) Just the file name with maybe an extension 2)A full path An help for either of the above would be appreciated. On Nov 21, 2:01 pm, "Academia" <academiaNOS***@a-znet.com> wrote: If you give the FileInfo class the full path to the file it can> I'd like to check a string to see that it is a valid file name. > > Is there a Like pattern or RegEx that can do that. > > 1) Just the file name with maybe an extension > > 2)A full path > > An help for either of the above would be appreciated. determine if the file exists. dim fi as new System.IO.FileInfo("[Path]") if fi.Exists then 'do work end if Thanks but I know the file does not exist (yet).
Thanks for answering Show quoteHide quote "cfps.Christian" <ge0193***@otc.edu> wrote in message news:e5fee764-7be5-47f8-9b25-8cfe26d5c76e@w28g2000hsf.googlegroups.com... > On Nov 21, 2:01 pm, "Academia" <academiaNOS***@a-znet.com> wrote: >> I'd like to check a string to see that it is a valid file name. >> >> Is there a Like pattern or RegEx that can do that. >> >> 1) Just the file name with maybe an extension >> >> 2)A full path >> >> An help for either of the above would be appreciated. > > If you give the FileInfo class the full path to the file it can > determine if the file exists. > > dim fi as new System.IO.FileInfo("[Path]") > if fi.Exists then > 'do work > end if On Nov 21, 1:01 pm, "Academia" <academiaNOS***@a-znet.com> wrote: Well... That depends on what your trying to accomplish? If your> I'd like to check a string to see that it is a valid file name. > > Is there a Like pattern or RegEx that can do that. > > 1) Just the file name with maybe an extension > > 2)A full path > > An help for either of the above would be appreciated. checking for existance, then there is always System.IO.File.Exists. If your just checking to make sure that you have a potentially valid file name, then you can use the System.IO.Path classes GetInvalidFileNameChars and GetInvalidPathChars to get an array of characters that are not allowed in a file name and path, then you could check to make sure your file name doesn't contain any of those characters, using the String.IndexOfAny. If it returns anything other then negative 1, then you have a bad filename: dim bfc() as char = path.getinvalidfilenamechars() if filename.indexofany(bfc) > -1 then ' illegal file name end if -- Tom Shelton I had read the help for GetInvalidPathChars and was confused about what its
warning meant. I had also checked and the characters are only "<>| If I include a * in the filename an SaveAs file dialog box will not return if I click OK. Not sure if that means * is NG or if it's is just the dialogbox's treatment. I tried / and Notebook's file save dialogbox says it is invalid. So I'm confused about what to believe. Thanks Show quoteHide quote "Tom Shelton" <tom_shel***@comcast.net> wrote in message news:f0a8b1cf-630a-4ac4-b60e-959fc5c4d7da@f13g2000hsa.googlegroups.com... > On Nov 21, 1:01 pm, "Academia" <academiaNOS***@a-znet.com> wrote: >> I'd like to check a string to see that it is a valid file name. >> >> Is there a Like pattern or RegEx that can do that. >> >> 1) Just the file name with maybe an extension >> >> 2)A full path >> >> An help for either of the above would be appreciated. > > Well... That depends on what your trying to accomplish? If your > checking for existance, then there is always System.IO.File.Exists. > If your just checking to make sure that you have a potentially valid > file name, then you can use the System.IO.Path classes > GetInvalidFileNameChars and GetInvalidPathChars to get an array of > characters that are not allowed in a file name and path, then you > could check to make sure your file name doesn't contain any of those > characters, using the String.IndexOfAny. If it returns anything other > then negative 1, then you have a bad filename: > > dim bfc() as char = path.getinvalidfilenamechars() > > if filename.indexofany(bfc) > -1 then > ' illegal file name > end if > > -- > Tom Shelton > Also GetInvalidFilenameChars does not include \ and :
Seems it should. Are they OK in a filename as apposed to a path? thanks Show quoteHide quote "Academia" <academiaNOSPAM@a-znet.com> wrote in message news:ufDjBDILIHA.2176@TK2MSFTNGP06.phx.gbl... >I had read the help for GetInvalidPathChars and was confused about what its >warning meant. > I had also checked and the characters are only "<>| > If I include a * in the filename a SaveAs file dialog box will not return > if I click OK. > Not sure if that means * is NG or if it's is just the dialogbox's > treatment. > I tried / and Notebook's file save dialogbox says it is invalid. > > So I'm confused about what to believe. > > > Thanks > > > > "Tom Shelton" <tom_shel***@comcast.net> wrote in message > news:f0a8b1cf-630a-4ac4-b60e-959fc5c4d7da@f13g2000hsa.googlegroups.com... >> On Nov 21, 1:01 pm, "Academia" <academiaNOS***@a-znet.com> wrote: >>> I'd like to check a string to see that it is a valid file name. >>> >>> Is there a Like pattern or RegEx that can do that. >>> >>> 1) Just the file name with maybe an extension >>> >>> 2)A full path >>> >>> An help for either of the above would be appreciated. >> >> Well... That depends on what your trying to accomplish? If your >> checking for existance, then there is always System.IO.File.Exists. >> If your just checking to make sure that you have a potentially valid >> file name, then you can use the System.IO.Path classes >> GetInvalidFileNameChars and GetInvalidPathChars to get an array of >> characters that are not allowed in a file name and path, then you >> could check to make sure your file name doesn't contain any of those >> characters, using the String.IndexOfAny. If it returns anything other >> then negative 1, then you have a bad filename: >> >> dim bfc() as char = path.getinvalidfilenamechars() >> >> if filename.indexofany(bfc) > -1 then >> ' illegal file name >> end if >> >> -- >> Tom Shelton >> > > Academia wrote:
> Also GetInvalidFilenameChars does not include \ and : There are characters which are valid for NTFS but may not be valid for the > Seems it should. Are they OK in a filename as apposed to a path? OS. In particular, note the last paragraph of http://blogs.msdn.com/brian_dewey/archive/2004/01/19/60263.aspx Andrew Good site
thanks Show quoteHide quote "Andrew Morton" <a**@in-press.co.uk.invalid> wrote in message news:uWiKv3OLIHA.5580@TK2MSFTNGP02.phx.gbl... > Academia wrote: >> Also GetInvalidFilenameChars does not include \ and : >> Seems it should. Are they OK in a filename as apposed to a path? > > There are characters which are valid for NTFS but may not be valid for the > OS. > > In particular, note the last paragraph of > http://blogs.msdn.com/brian_dewey/archive/2004/01/19/60263.aspx > > Andrew > try to create a file with that name/path, then delete it.... XD
Show quoteHide quote "Academia" <academiaNOSPAM@a-znet.com> wrote in message news:%23hI9%23kHLIHA.1212@TK2MSFTNGP05.phx.gbl... > I'd like to check a string to see that it is a valid file name. > > Is there a Like pattern or RegEx that can do that. > > 1) Just the file name with maybe an extension > > 2)A full path > > > An help for either of the above would be appreciated. > > > > > > > I don't know much about memory files but would that be a way to go?
Thanks Show quoteHide quote "Eternal Snow" <allen_st_cl***@msn.com> wrote in message news:9D6F86F6-F769-4EBA-A562-4E285D7D7098@microsoft.com... > try to create a file with that name/path, then delete it.... XD > > "Academia" <academiaNOSPAM@a-znet.com> wrote in message > news:%23hI9%23kHLIHA.1212@TK2MSFTNGP05.phx.gbl... >> I'd like to check a string to see that it is a valid file name. >> >> Is there a Like pattern or RegEx that can do that. >> >> 1) Just the file name with maybe an extension >> >> 2)A full path >> >> >> An help for either of the above would be appreciated. >> >> >> >> >> >> >> > I always wondered about MAX_PATH.
Thinking there might have to be room for a Null at the end (or maybe 2 nulls) Is name.Length > MAX_PATH then errorCode end if correct? Show quoteHide quote "Academia" <academiaNOSPAM@a-znet.com> wrote in message news:%23hI9%23kHLIHA.1212@TK2MSFTNGP05.phx.gbl... > I'd like to check a string to see that it is a valid file name. > > Is there a Like pattern or RegEx that can do that. > > 1) Just the file name with maybe an extension > > 2)A full path > > > An help for either of the above would be appreciated. > > > > > > > |
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