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VB.NET UWP/WinRT Examples

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(VB.NET UWP/WinRT) Download File from Dropbox into a String Variable

Demonstrates how to download a file from Dropbox directly into a string variable.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

'  A Dropbox access token should have been previously obtained.
'  Dropbox access tokens do not expire.
'  See Dropbox Access Token.

Dim rest As New Chilkat.Rest

'  Connect to Dropbox
Dim success As Boolean = Await rest.ConnectAsync("content.dropboxapi.com",443,True,True)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


'  Add request headers.
rest.AddHeader("Authorization","Bearer DROPBOX_ACCESS_TOKEN")

'  The download "parameters" are contained in JSON passed in an HTTP request header.
'  This is the JSON indicating the file to be downloaded:
'  {
'     "path": "/jack.txt",
'  }


Dim json As New Chilkat.JsonObject
json.AppendString("path","/jack.txt")
rest.AddHeader("Dropbox-API-Arg",json.Emit())

'  The content of the file on Dropbox is returned.
Dim fileContent As String = Await rest.FullRequestNoBodyAsync("POST","/2/files/download")
If (rest.LastMethodSuccess <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


'  When successful, Dropbox responds with a 200 response code.
If (rest.ResponseStatusCode <> 200) Then
    '  Examine the request/response to see what happened.
    Debug.WriteLine("response status code = " & rest.ResponseStatusCode)
    Debug.WriteLine("response status text = " & rest.ResponseStatusText)
    Debug.WriteLine("response header: " & rest.ResponseHeader)
    Debug.WriteLine("response body (if any): " & fileContent)
    Debug.WriteLine("---")
    Debug.WriteLine("LastRequestStartLine: " & rest.LastRequestStartLine)
    Debug.WriteLine("LastRequestHeader: " & rest.LastRequestHeader)
    Exit Sub
End If


'  Show the file content that was downloaded:
Debug.WriteLine(fileContent)
Debug.WriteLine("----")

'  Information about the downloaded file is also available as JSON in a response header.
'  The "dropbox-api-result" response header contains the information.  For example:
Dim apiResult As String = rest.ResponseHdrByName("dropbox-api-result")
Debug.WriteLine(apiResult)

'  In this case, the pretty-formatted dropbox-api-result JSON looks like this:
'  {
'    "name": "jack.txt",
'    "path_lower": "/jack.txt",
'    "path_display": "/jack.txt",
'    "id": "id:yqx4-tE_NKAAAAAAAAAAAQ",
'    "client_modified": "2016-06-02T20:42:11Z",
'    "server_modified": "2016-06-02T20:42:11Z",
'    "rev": "8482db15f",
'    "size": 42
'  }

'  Load the JSON, pretty-print it, and demonstrate how to get some values...
Dim jsonResult As New Chilkat.JsonObject
jsonResult.EmitCompact = False
jsonResult.Load(apiResult)
'  Show the JSON pretty-printed...
Debug.WriteLine(jsonResult.Emit())

'  Sample code to get data from the JSON response:
Dim size As Integer = jsonResult.IntOf("size")
Debug.WriteLine("size = " & size)

Dim rev As String = jsonResult.StringOf("rev")
Debug.WriteLine("rev = " & rev)

Dim clientModified As String = jsonResult.StringOf("client_modified")
Dim ckdt As New Chilkat.CkDateTime
ckdt.SetFromTimestamp(clientModified)
Dim bLocalTime As Boolean = True
Dim dt As Chilkat.DtObj = ckdt.GetDtObj(bLocalTime)
Debug.WriteLine(dt.Day & "/" & dt.Month & "/" & dt.Year & " " & dt.Hour & ":" & dt.Minute)


 

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