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Get onedrive file URL from a the locally cached file

I am looking for a way to derive the OneDrive file URL for a file cached to my local OneDrive folder? The only thing I can think of is hardcoding some root URLS for each of the OneDrive folders I have, but this seems nasty!
Does anyone know of any OneDrive client API that lets query a URL based on the local file path?
My use case:
I am trying to attach to and open instance of an Excel workbook. I used to be able to do this Marshal.BindToMoniker(_workbookPath);
However it appears that Excel is now registering the OneDrive URL in the ROT rather than the local file path. This this happened with the update that brought the new auto-save feature to Excel 2016 I think, that seems to be about the time my existing code broke.
There is a similar unanswered question here: C# OneDrive for Business / SharePoint: get server path from locally synced file

Might want to use the following key instead:
HKEY_CURRENT_USER\Software\SyncEngines\Providers\OneDrive
This includes the following registry values:
UrlNamespace: (SharePoint site URL)
MountPoint: (local driver location)
It does appear to include old values which are no longer synced - but it shouldn't be too hard to check against
HKEY_CURRENT_USER\Software\Microsoft\OneDrive\Accounts\Business1\ScopeIdToMountPointPathCache
or
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\SyncRootManager
for paths that are being actively synced.

I am also looking at a solution for getting the SharePoint url to a file in OneDrive Synced File Explorer.
I have noticed you get under C:\Users%username%\AppData\Local\Microsoft\OneDrive\settings\Business1{GUID}.ini a mapping between your OneDrive synced folder and the SharePoint GUID
Example:
libraryScope = 1 630c2a866d9c458b81060eff107887ed+1 5 "GUIDEs" "Documents" 4 "https://mytenant.sharepoint.com/teams/team_10000035" "8d4b558f-7b2e-40ba-ad1f-e04d79e6265a" e0266a43caf347238f684bab486f4e51 e0d25dcb1a014f5f86d787984f6327c2 4f86b3e3e54e42e0bb0f7a58eadf0335 0 "" 0 4cde5c00-3fe3-4162-b831-d8ef440e1593 libraryFolder = 0 1 8bbfe07dfeff41cea7ab5da4a554592a+1 1558084235 "D:\DSUsers\uid41890\TenantName\GUIDEs - General" 2 "General" bd0c1b7c-2a1f-4492-8b1b-8e152c9e0c26
You also have this mapping in the registry Computer\HKEY_CURRENT_USER\Software\Microsoft\OneDrive\Accounts\Business1\ScopeIdToMountPointPathCache
From the GUID you could get the path using SPWeb.GetFile(Guid)
If you can make a standalone function given a local OneDrive file path that returns the SharePoint url, I would greatly appreciate you share your solution here.

I have implemented a solution in AutoHotkey see documentation here
It is based on #GWD idea (see comments below) to generate a temporary excel file with the formula CELL("filename") at each sync locations to extract this mapping information to a text file that is then later parsed to do the reverse mapping from local file to SharePoint url.

How to find a file in server based on name in c#

I have an xml named Mapping.xml stored in my local system. i am accessing in code ,in my local system like XDocument xd = new XDocument(#"D:\MVCPopup\Mapping.xml"); .But i don't think this will work if i deploy it in iis server due to the folder structure change.Do we have a generic mechanism which will find the file Mapping.xml. Will Server.Mappath will work here?

Server.MapPath returns the phisical address from a virtual one. So if you configure a virtual folder on the iis that maps to the folder you save your XML in, then yes, Server.MapPath will help.

Upload files to a remote server

I need to upload files from my asp.net (C#) page residing in the web server to a remote server.
I managed to upload files to remote server from localhost using this code:
string serverPath = "\\\\xx.xxx.xx.xx\\Folder\\" + FileUpload1.FileName;
FileUpload1.PostedFile.SaveAs(serverPath);
But after I published this code to my web server, it stopped working with the error "The network path was not found."
I have looked at a few solutions which suggest using UNC network share and implementing impersonation.
I couldn't figure out how to apply these solutions.
Can someone please give an example, or suggest a simpler solution.
Thanks!!

In FileUpload1.PostedFile.SaveAs(path), path is physical path of file, No Url. You must check:
is Physical folder Exsist?
is You have access to folder?
if answer of both question is true check this code:
string serverPath = #"\\xxx.xxx.xxx.xxx\Folder\";
if (!System.IO.Directory.Exists(serverPath))
System.IO.Directory.CreateDirectory(serverPath);
FileUpload1.PostedFile.SaveAs(serverPath + FileUpload1.FileName);

The account your application runs under must have write permissions to the folder you are trying to upload the file to: \\xx.xxx.xx.xx\Folder\. So you will have to configure the application pool in IIS to run under an account that will have sufficient permissions. Go to the application pool properties in the IIS management console where you will be able to specify an account to be used to run the application. By default it uses a built-in account which won't have any access to shared resources. Take a look at the following article which explains how to do so.

You need a virtual directory on your webserver to upload to. In code you'll have to use Server.Mappath("virtual path") function to get its server path and then save to it.

Providing links to files outside of IIS

I have an upload function in my system that stores the files on the d drive e.g D:\KBFiles. Now i need to offer these files as links through internet explorer. Obviously i cant just offer a path e.g D:\KBFiles\test.pdf. Whats the best way to handle this scenario

Write "proxy" file with such code and call it DownloadFile.aspx:
string fileName = Request.QueryString["file"];
string filePath = Path.Combime("D:\\KBFile", fileName);
Response.WriteFile(filePath);
Then have such link:
test.pdf
This allows you to check the user permissions if you're using Login system and also you can check the requested file against some white list to prevent hacking attempts.

You need to create a Virtual Folder for that windows folder inside your WebApplication. As soon as IIS has mapped the virtual folder, it would be possible to use direct links, which would have your WebApplication as a root.

Getting the full file path when using a file upload control

I wrote some code to upload files to amazon S3, if I put a full file path manually It successfully uploads the file from my computer. What I'm trying to do is use a file upload control and store the full path in a variable so that I can use it for my amazon method. Ive read everywhere it seems that the browser won't let you get the full file path for security reasons.
How can I get the full file path? Should I just store the files on my webserver and point my amazon method to the server path, and then use the file upload control to tell it what the filename is? I wish I could just do a straight shot to amazon...

First we have to save the file path and then we take it from
string filepath=Path.GetFullPath(UploadFile1.FileName.toString());

I came across this link which has a great tutorial and even gives you a working sample project. (this is different from the code that the .net SDK includes...) http://aws.amazon.com/articles/774?_encoding=UTF8&jiveRedirect=1

We can't take full path in HTML or JS as it violets security so whenever you try to see the path it shows fakepath
so to resolve this issue you can make a seprate folder and you can store the uploaded file there and in the code you can take that folders path as default and use it as a absolute path.
You can get the full path using Python Tkinter but it is limited for desktop app.