File Access Denied in PDA(IE Mobile Ver. 5)

[Jeywin Lizy]

My web application need to get file size and file contents of the file the user will be selecting.

It was throwing error on
FileInfo fileInfo = new FileInfo(pathSource);
return fileInfo.Length.ToString();

I thought it was due to CAS
and so included
assembly:PermissionSetAttribute(SecurityAction.Req uestMinimum, Name = "FullTrust")]

It started working fine in my system,even with remote access to the appln.

But it throws an error if the application is accessed via PDA(with IE mobile ver 5) when the user selects a file say 'Test.txt' available in the user's PDA.
Throws an error 'Cannot find the file \...filepath...\Test.txt

Pls let me know the possible way to enable my application to get the details of the file the user may select from the user's harddisk(PDA in this case)

Or should I change any security setting in PDA?
Or is there a way allow this permission thro' ASP.Net code?

Thanks in advance.

[Plater]

Your FileInfo code ONLY runs on the server of the web application.
Unless you have installed the application onto the PDA, it should always fail because the files are on the PDA not the server

[Jeywin Lizy]

Hi Plater
Please let me know how then to access the files (read file content) in PDA.
I have removed the FileInfo.The code below


//returns the stream of the filefor which path passed
Stream a = ReadStream(txtFilePath.Text);
Label1.Text = a.Length.ToString();

works fine in my system.
But it throws an error if the application is accessed via PDA(with IE mobile ver 5) when the user selects a file say 'Test.txt' available in the user's PDA.

Throws an error
System.IO.DirectoryNotFoundException:could not find a part of the path 'c:\SD-MMCard\Test.txt'

The file selected from PDA is \SD-MMCard\Test.txt
But it gives a message as tho' it is located in C drive.
Pls let me know how to read the file the user may select from the user's harddisk(PDA in this case)
(FileUpload is not supported in IE mobile ver 5.0 - which is my actual requirement/task)

Do I need to change some setting in PDA?
Or can this be trapped in ASP.Net code itself?

I have also tried giving:
<trust level="Full" />

Pls help me.

Thanks
Lizy

[Plater]

Your users will have to upload the file to you.
The FilUpload control might be a good control to look at for this task.

[Curtis Rutland]

Yes, can you imagine the security risk if servers were able to remotely browse client's file systems?

[Jeywin Lizy]

I have tried using <asp:FileUpload... and <input type=file ...
But this works only in IE.
The PDA with IE Mobile version 5.0 does not support this.
I am able upload only XML or zip file. Otherwise
the HTTPFileCollection does not contain any file after browsing & selecting files
and it throws an error when trying to retrieve from PostedFile.


I debuggeg and found
Request.Browser.Capabilities["supportsFileUpload"] returns False (for IE 6 it returns True)

Request.AcceptTypes returns only */* --> wheras IE 6 returns many others(jpeg,giff,bmp...xls...) along with this

It there is a way around for this please let me know asap.

Thanks

[Plater]

Unless there is some setting in ie5 that you can change to allow support for it, no I don't think there is. At least not a web based solution.
You might be able to write a regular app that uses socket calls, but that seems like it would be more likely to be blocked on that pda

[Jeywin Lizy]

Thanks for your replies. After trying regarding FileUpload control I thought the work around to upload file in PDA will be like reading the files the user selects and saving it in database
But this gives message as I have said in my prev post
'System.IO.DirectoryNotFoundException:could not find a part of the path'
(but works fine in PC).Please let me know how I can trap this error .Otherwise said How can I accomplish this task of reading files in PDA.Please help me.

Please let me know if I can move in this direction

or is it that its not the correct way of proceeding as InsertAlias has pointed out about security risk if servers were able to remotely browse client's file systems

or any other workaround that can be done to accomplish this.

Your solution & suggestion will be really of much much help.
Thanks in advance.

[Plater]

AGAIN....your backend code ONLY RUNS ON THE SERVER, it does not run on the client.
If the FileUpload is blocked by the PDA, and you must have file uploads.
It might be time for a new pda, or time to upgrade the software on it.