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(VB.NET) Download File from Dropbox into a String VariableDemonstrates how to download a file from Dropbox directly into a string variable.
' 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 = rest.Connect("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 = rest.FullRequestNoBody("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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