[RESOLVED] [VB6] upload file to Dropbox

[IHappenToBe']

Hi.

How can I upload a file to my Dropbox public folder (https)?

I can download perfectly with Inet and this function:

Public Sub DownloadFile(strURL As String, strDestination As String)
    Const CHUNK_SIZE As Long = 1024
    Dim intFile As Integer
    Dim lngBytesReceived As Long
    Dim lngFileLength As Long
    Dim strHeader As String
    Dim b() As Byte
    
    DoEvents
    
    With Inet2
    
    .URL = strURL
    .Execute , "GET", , "Range: bytes=" & CStr(lngBytesReceived) & "-" & vbCrLf
    
    While .StillExecuting
    DoEvents
    Wend
    
    strHeader = .GetHeader
    End With
    
    strHeader = Inet2.GetHeader("Content-Length")
    lngFileLength = Val(strHeader)
    
    DoEvents
    
    lngBytesReceived = 0
    
    intFile = FreeFile()
    
    Open strDestination For Binary Access Write As #intFile
    
    Do
    b = Inet2.GetChunk(CHUNK_SIZE, icByteArray)
    Put #intFile, , b
    lngBytesReceived = lngBytesReceived + UBound(b, 1) + 1
    
    Loop While UBound(b, 1) > 0
    
    Close #intFile

End Sub

But now I need to UPload.

[IHappenToBe']

I mean, it's very easy to GET from ftp and http.
I also can PUT to ftp very easy... It should be easy as well to PUT to http!

PS: I don't need to use Inet, I can use any way to upload to https

[DataMiser]

In order to upload there has to be something on the other end that will receive it and the method you use needs to be in accordance with what is expected by the server.

You say you can put very easy, why is it that you are not going that route?

[dilettante]

The guts of what is required is documented at:

https://www.dropbox.com/developers/core/docs

There's a lot to deal with such as just for starters OAuth and JSON.

[szlamany]

The guts of what is required is documented at:

https://www.dropbox.com/developers/core/docs

There's a lot to deal with such as just for starters OAuth and JSON.

At least that is well documented!

[dilettante]

Dropbox isn't meant to be used silently as a datastore behind an application, as made clear by requirements such as:

Step 2 of authentication. Applications should direct the user to /oauth/authorize. This isn't an API call per se, but rather a web endpoint that lets the user sign in to Dropbox and choose whether to grant the application the ability to access files on their behalf. The page served by /oauth/authorize should be presented to the user through their web browser. Without the user's authorization in this step, it isn't possible for your application to obtain an access token from /oauth/access_token.

[IHappenToBe']

Now I get why I was having so much trouble.
For a moment I thought it was brilliant to replace my ftp server with Dropbox... now I see it was a poor illusion. I'm going back to ftp server.

Thank you!
Matter closed.
(Not entierly "resolved" but closed.)

[szlamany]

The drop box folder maps locally to your USER folder - why were you doing all this when it's just a path on your machine anyway?

[IHappenToBe']

The drop box folder maps locally to your USER folder - why were you doing all this when it's just a path on your machine anyway?

Because I wanted my software, which is in many other PC, to add a file to my Dropbox account instead of uploading it to a server.

[szlamany]

Then why not make a "service" that is mapped to drop box - locally to itself - that sees your other PC's and does that upload??

Are you just looking free space - or a way to archive/backup information?

[dilettante]

Might be anything: user feedback, errors, usage logs, or ... keylogger captures.

The downsides of FTP are that people can grab your credentials easily using sniffers, firewalls often block it, and NAT issues can mean you have to support PASV mode FTP.

The downside of simple HTTP file transfer protocols is that even using SSL it is fairly easy for somebody to grab your credentials using a common tool like Fiddler.

This is why most advanced services put you through wringers like OAuth or more complex cryptographic credential approaches using HMAC. Even OAuth is weaker than you really want to use though.