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<h1>ASP Scripts to Determine if Specified File and Folders Exist</h1>
<p align="left">Here are two VBScript functions that check to see if a specified file or
folder exist on the server. As such they can be used to improve error handling on ASP
pages that read or write files from disk.</p>
<h2 align="left">Checking to see if a File Exists</h2>
<p align="left">The first function (<b>CheckFileExists</b>) checks to see if a file
exists. It returns 'True' if the file exists, or 'False' if it does not. </p>
<p align="left"><font color="#000080"><%<br>
Function CheckFileExists(sFileName)<br>
<br>
Dim FileSystemObject<br>
<br>
Set FileSystemObject = Server.CreateObject("Scripting.FileSystemObject")<br>
<br>
If (FileSystemObject.FileExists(sFileName)) Then<br>
CheckFileExists = True<br>
Else<br>
CheckFileExists = False<br>
End If<br>
<br>
Set FileSystemObject = Nothing<br>
<br>
End Function<br>
%> </font></p>
<p align="left">The following code is an example of how to use the function: </p>
<p align="left"><font color="#000080"><%<br>
If CheckFileExists("</font><font color="#FF0000">D:\ProductionReports\July2005\July-12-2005.xls</font><font
color="#000080">") Then<br>
Response.Write("</font><font color="#FF0000">The production report for July 2005 is
available</font><font color="#000080">")<br>
Else<br>
Response.Write("</font><font color="#FF0000">The production report for July 2005
cannot be found</font><font color="#000080">")<br>
End If<br>
%> </font></p>
<h2 align="left">Checking to see if a Folder Exists</h2>
<p align="left">The second function (<b>CheckFolderExists</b>) checks to see if a folder
exists. It returns 'True' if the folder exists, or 'False' if it does not. </p>
<p align="left"><font color="#000080"><%<br>
Function CheckFolderExists(sFolderName)<br>
<br>
Dim FileSystemObject<br>
<br>
Set FileSystemObject = Server.CreateObject("Scripting.FileSystemObject")<br>
<br>
If (FileSystemObject.FolderExists(sFolderName)) Then<br>
CheckFolderExists = True<br>
Else<br>
CheckFolderExists = False<br>
End If<br>
<br>
Set FileSystemObject = Nothing<br>
<br>
End Function<br>
%> </font></p>
<p align="left">The following code is an example of how to use the CheckFolderExists
function: </p>
<p align="left"><font color="#000080"><%<br>
If CheckFolderExists("</font><font color="#FF0000">D:\ProductionReports\July2005</font><font
color="#000080">") Then<br>
Response.Write("</font><font color="#FF0000">The production reports for July 2005 are
available</font><font color="#000080">")<br>
Else<br>
Response.Write("</font><font color="#FF0000">The production reports for July 2005 are
not available</font><font color="#000080">")<br>
End If<br>
%> </font></p>
<h2 align="left">Problems with File Permissions</h2>
<p align="left">A problem with these two functions is the fact that they will check for
the existence of files and folders, but do not indicate whether the user has the
appropriate permissions to view them. </p>
<p align="left">A way around this problem is to use the Permission Checker Component. This
Component is supplied with the Internet Information Server 4.0 Resource Kit, and also with
the Internet Information Services 5.0 of Windows 2000. This object has one method -
HasAccess, which makes it possible to determine if the user has permission to read a
specified file. </p>
<p align="left">An example of using the component is below: </p>
<p align="left"><font color="#000080"><%<br>
Set PermissionChecker = Server.CreateObject("MSWC.PermissionChecker")<br>
<br>
If PermissionChecker.HasAccess("</font><font color="#FF0000">D:\ProductionReports\July2001\July-19-2001.xls</font><font
color="#000080">") Then<br>
Response.Write("</font><font color="#FF0000">You have permission to view the July
2001 production report</font><font color="#000080">")<br>
Else<br>
Response.Write("</font><font color="#FF0000">You do not have permission to view the
July 2001 production report</font><font color="#000080">")<br>
End If<br>
<br>
Set PermissionChecker = nothing<br>
%></font> </p>
<p align="left">The Permission Checker Component can also be incorporated into the
original CheckFileExists function: </p>
<p align="left"><font color="#000080"><%<br>
Function CheckFileExists(sFileName)<br>
<br>
Dim FileSystemObject<br>
<br>
Set FileSystemObject = Server.CreateObject("Scripting.FileSystemObject")<br>
<br>
If (FileSystemObject.FileExists(sFileName)) Then<br>
Set PermissionChecker = Server.CreateObject("MSWC.PermissionChecker")<br>
<br>
If PermissionChecker.HasAccess(sFileName) Then<br>
CheckFileExists = True <br>
End If<br>
<br>
Set PermissionChecker = nothing<br>
Else<br>
CheckFileExists = False<br>
End If<br>
<br>
Set FileSystemObject = Nothing<br>
<br>
End Function<br>
%> </font></p>
<p align="left">The function can then be used in a similar way to before: </p>
<p align="left"><font color="#000080"><%<br>
If CheckFileExists("</font><font color="#FF0000">D:\ProductionReports\July2001\July-12-2001.xls</font><font
color="#000080">") Then<br>
Response.Write("</font><font color="#FF0000">The production report for July 2001 is
available</font><font color="#000080">")<br>
Else<br>
Response.Write("</font><font color="#FF0000">The production report for July 2001
cannot be found or you do not have permission to view it</font><font color="#000080">")<br>
End If<br>
%></font> </p>
<h2 align="left">Further Reading</h2>
<ul>
<li><a href="http://msdn.microsoft.com/library/psdk/iisref/comp3hf8.htm" target="_blank">Further
information</a> about the Permission Checker Component is available from Microsoft. </li>
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