How to found if folder exist or not

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I want to know how i found if folder exixt or not in google drive with vb.net . i searched many tutorial and page and i can't do it

What I have tried:

i think i will do a list of folder ,and if my folder exist in list , messagebox will show exist message else my folder will be upload in drive . the problem is how i do it , i'm very very stuck

Posted 26-Jul-17 22:57pm

Member 8587273

Updated 26-Jul-17 23:10pm

v2

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Graeme_Grant · Answer 1 · 2017-07-26T23:10:00

Solution 1

The Google Drive List command has a query parameter: Files: list | Drive REST API v2 | Google Developers[^]

More information here on how to query: Search for Files | Drive REST API v2 | Google Developers[^]

Note: Files and folders use the same API endpoints, the mimetype determines if it is a folder or a file. More information here: Work with Folders | Drive REST API v2 | Google Developers[^]

UPDATE: As per the Search for Files | Drive REST API v2 | Google Developers[^], searching for a folder:

"mimeType = 'application/vnd.google-apps.folder' AND name = '[foldername]'"

Please take the time to read the documentation and the excellent examples given by Google.

Posted 26-Jul-17 23:10pm

Graeme_Grant

Updated 27-Jul-17 1:08am

v6

Comments

Member 8587273 27-Jul-17 6:11am

I tried to integrate this code in my application .
I create a new boolean function which return false if folder exist
and i call it in another methode , but i have an exception

Google.GoogleApiException : 'Google.Apis.Requests.RequestError

Invalid query [400]

Errors [

Message[Invalid query] Location[q - parameter] Reason[invalid] Domain[global]

]

here is my function method code

Public Function exist(v As String) As Boolean
Dim pag As String
Dim req = Service.Files.List()
req.Q = "application/vnd.google-apps.folder"
req.PageToken = pag
Dim result = req.Execute()
If (result.NextPageToken IsNot Nothing) Then
Return False
Else
Return True
End If

End Function

here where i call it

If (exist(dat_sauv.SelectedItem) = False) Then
MessageBox.Show("folder exist already")

End If

the exception has declenched in this line (exist method)

Dim result = req.Execute()

Graeme_Grant 27-Jul-17 6:14am

Please don't post code in replies as it is too difficult to read. Instead, post in the question. Here are instructions on how: Code Project Quick Answers FAQ[^]

Graeme_Grant 27-Jul-17 6:16am

"Message[Invalid query] Location[q - parameter] Reason[invalid] Domain[global]" - your query param is not correctly formed. Start with simple queries first, then work towards your complex/advanced query.

Member 8587273 27-Jul-17 6:27am

thanks , i post my code in another Question

Graeme_Grant 27-Jul-17 7:00am

The other question was closed as it is the same as this one. Please following the posting guidelines as outlined in the FAQ.

As mentioned above, you need to read the documentation: Search for Files | Drive REST API v2 | Google Developers[^] - the documentation clearly explains how to query (Google query language) for folders or files and how to search the name field - see the section labeled EXAMPLES.

Graeme_Grant 27-Jul-17 7:05am

I have posted the answer to your question. Please take the time to read the excellent Google documentation.

Member 8587273 27-Jul-17 7:38am

i read those articles , but i don't know what's the solution of my error

Graeme_Grant 27-Jul-17 7:45am

As already mentioned, I have posted the answer for you. Please read the "update" in my answer above.